# Script helping make fast-forwarding histories while still rebasing
# upstream deltas when working on Debian packaging
#
-# Copyright (C)2017 Ian Jackson
+# Copyright (C)2017,2018 Ian Jackson
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
-# usages:
-# git-debrebase status
-# git-debrebase start # like ffqrebase start + debrebase launder
-# git-debrebase new-upstream [stuff] # see below
-# git-debrebase <git-rebase options> # does debrebase start if necessary
-#
-# git-debrebase analyse
-# git-debrebase launder # prints breakwater tip
-# git-debrebase create-new-upstream-breakwater [-f] <upstreaminfo>...
-#
-# <upstreaminfo> is
-# [,][<subdir>:][+]<commitid>[,...]
-#
-# if initial comma is supplied, entries are not positional. Unspecified
-# <subdir> means root (and there may be only one).
-# xxx want auto branch names
-# xxx too complicated
-# how about for now
-# [+]<commit> [<subdir/> [+]<commit>...]
-# ? plus options
-# --new-upstream-different-subtrees
-#
-# automatic case
-# git-debrebase new-upstream
-# - previous breakwater merge must be gdr-generated
-# - orig set is the same as before
-# - implicitly uses upstream branches according to orig set
-# - not all upstream branches need be updated
-# - insists on fast-forward of each branch, unless
-# --force (or --force=<subdir>[/])
-# branch set adjustments
-# git-debrebase new-upstream --add <subdir>/
-# git-debrebase new-upstream --rm <subdir>/
-# git-debrebase new-upstream / [<subdir>/ ...]
-# - orig set is adjusted
-# - otherwise like auto (--add is not checked for ffness, obv)
-# - multiple --add and --rm may be specified
-# - --add makes new upstream the last contributor
-# explicit
-# git-debrebase / [<rootcommitid>] [<subdir>/ [<commitid>] ...]
-# - orig set is precisely as specified now
-# - previous breakwater merge is irrelevant
-# - no fast forward checks
-# for now only explicit with commitids
-
- # implicitly uses `upstream'
-# # (or multiple other branches)
-# git-debrebase new-upstream \
-# [<subdir>/]=<commitid>
-
-# UPSTREAM[,[[SUBDIR:]SUBUPSTREAM]
-# default for SUBDIR: is from previous upstream merge[xxx terminology]
-#
-#
-#xxx
-# when starting must record original start (for ff)
-# and new rebase basis
-#
-# git-ffqrebase start [BASE]
-# # records previous HEAD so it can be overwritten
-# # records base for future git-ffqrebase
-# git-ffqrebase set-base BASE
-# git-ffqrebase <git-rebase options>
-# git-ffqrebase finish
-# git-ffqrebase status [BRANCH]
-#
-# refs/ffqrebase-prev/BRANCH BRANCH may be refs/...; if not it means
-# refs/ffqrebase-base/BRANCH refs/heads/BRANCH
-# zero, one, or both of these may exist
+END { $? = $Debian::Dgit::ExitStatus::desired // -1; };
+use Debian::Dgit::GDR;
+use Debian::Dgit::ExitStatus;
use strict;
+use Debian::Dgit qw(:DEFAULT :playground);
+setup_sigwarn();
+
use Memoize;
+use Carp;
+use POSIX;
use Data::Dumper;
+use Getopt::Long qw(:config posix_default gnu_compat bundling);
+use Dpkg::Version;
+use File::FnMatch qw(:fnmatch);
+use File::Copy;
-use Debian::Dgit qw(:DEFAULT $wa);
+$debugcmd_when_debuglevel = 2;
+
+our ($usage_message) = <<'END';
+usages:
+ git-debrebase [<options>] [--|-i <git rebase options...>]
+ git-debrebase [<options>] status
+ git-debrebase [<options>] prepush [--prose=...]
+ git-debrebase [<options>] quick|conclude
+ git-debrebase [<options>] new-upstream <new-version> [<details ...>]
+ git-debrebase [<options>] convert-from-gbp [<upstream-commitish>]
+ ...
+See git-debrebase(1), git-debrebase(5), dgit-maint-debrebase(7) (in dgit).
+END
+
+our ($opt_force, $opt_noop_ok, @opt_anchors);
+our ($opt_defaultcmd_interactive);
+
+our $us = qw(git-debrebase);
+
+$|=1;
+
+sub badusage ($) {
+ my ($m) = @_;
+ print STDERR "$us: bad usage: $m\n";
+ finish 8;
+}
+
+sub getoptions_main {
+ my $m = shift;
+ local $SIG{__WARN__}; # GetOptions calls `warn' to print messages
+ GetOptions @_ or badusage $m;
+}
+sub getoptions {
+ my $sc = shift;
+ getoptions_main "bad options follow \`git-debrebase $sc'", @_;
+}
-sub cfg ($) {
- my ($k) = @_;
- $/ = "\0";
+sub cfg ($;$) {
+ my ($k, $optional) = @_;
+ local $/ = "\0";
my @cmd = qw(git config -z);
push @cmd, qw(--get-all) if wantarray;
push @cmd, $k;
- my $out = cmdoutput @cmd;
- return split /\0/, $out;
+ my $out = cmdoutput_errok @cmd;
+ if (!defined $out) {
+ fail "missing required git config $k" unless $optional;
+ return ();
+ }
+ my @l = split /\0/, $out;
+ return wantarray ? @l : $l[0];
}
memoize('cfg');
+sub dd ($) {
+ my ($v) = @_;
+ my $dd = new Data::Dumper [ $v ];
+ Terse $dd 1; Indent $dd 0; Useqq $dd 1;
+ return Dump $dd;
+}
+
sub get_commit ($) {
my ($objid) = @_;
- my ($type,$data) = git_cat_file $objid;
- die unless $type eq 'commit';
- $data =~ m/(?<=\n)\n/;
+ my $data = (git_cat_file $objid, 'commit');
+ $data =~ m/(?<=\n)\n/ or die "$objid ($data) ?";
return ($`,$');
}
-sub D_DEB () { return 0x1; } # debian/ (not including debian/patches/)
-sub D_UPS () { return 0x2; } # upstream files
-sub D_PAT_ADD () { return 0x4; } # debian/patches/ extra patches at end
-sub D_PAT_OTH () { return 0x8; } # debian/patches other changes
+sub D_UPS () { 0x02; } # upstream files
+sub D_PAT_ADD () { 0x04; } # debian/patches/ extra patches at end
+sub D_PAT_OTH () { 0x08; } # debian/patches other changes
+sub D_DEB_CLOG () { 0x10; } # debian/ (not patches/ or changelog)
+sub D_DEB_OTH () { 0x20; } # debian/changelog
+sub DS_DEB () { D_DEB_CLOG | D_DEB_OTH; } # debian/ (not patches/)
+
+our $playprefix = 'debrebase';
+our $rd;
+our $workarea;
+
+our @git = qw(git);
+our @dgit = qw(dgit);
+
+sub in_workarea ($) {
+ my ($sub) = @_;
+ changedir $workarea;
+ my $r = eval { $sub->(); };
+ { local $@; changedir $maindir; }
+ die $@ if $@;
+}
+
+sub fresh_workarea () {
+ $workarea = fresh_playground "$playprefix/work";
+ in_workarea sub { playtree_setup };
+}
+
+our $snags_forced = 0;
+our $snags_tripped = 0;
+our $snags_summarised = 0;
+our @deferred_updates;
+our @deferred_update_messages;
+
+sub all_snags_summarised () {
+ $snags_forced + $snags_tripped == $snags_summarised;
+}
+sub run_deferred_updates ($) {
+ my ($mrest) = @_;
+
+ confess 'dangerous internal error' unless all_snags_summarised();
+
+ my @upd_cmd = (git_update_ref_cmd "debrebase: $mrest", qw(--stdin));
+ debugcmd '>|', @upd_cmd;
+ open U, "|-", @upd_cmd or die $!;
+ foreach (@deferred_updates) {
+ printdebug ">= ", $_, "\n";
+ print U $_, "\n" or die $!;
+ }
+ printdebug ">\$\n";
+ close U or failedcmd @upd_cmd;
+
+ print $_, "\n" foreach @deferred_update_messages;
+
+ @deferred_updates = ();
+ @deferred_update_messages = ();
+}
+
+sub get_differs ($$) {
+ my ($x,$y) = @_;
+ # This resembles quiltify_trees_differ, in dgit, a bit.
+ # But we don't care about modes, or dpkg-source-unrepresentable
+ # changes, and we don't need the plethora of different modes.
+ # Conversely we need to distinguish different kinds of changes to
+ # debian/ and debian/patches/.
+
+ my $differs = 0;
+
+ my $rundiff = sub {
+ my ($opts, $limits, $fn) = @_;
+ my @cmd = (@git, qw(diff-tree -z --no-renames));
+ push @cmd, @$opts;
+ push @cmd, "$_:" foreach $x, $y;
+ push @cmd, '--', @$limits;
+ my $diffs = cmdoutput @cmd;
+ foreach (split /\0/, $diffs) { $fn->(); }
+ };
+
+ $rundiff->([qw(--name-only)], [], sub {
+ $differs |= $_ eq 'debian' ? DS_DEB : D_UPS;
+ });
+
+ if ($differs & DS_DEB) {
+ $differs &= ~DS_DEB;
+ $rundiff->([qw(--name-only -r)], [qw(debian)], sub {
+ $differs |=
+ m{^debian/patches/} ? D_PAT_OTH :
+ $_ eq 'debian/changelog' ? D_DEB_CLOG :
+ D_DEB_OTH;
+ });
+ die "mysterious debian changes $x..$y"
+ unless $differs & (D_PAT_OTH|DS_DEB);
+ }
+
+ if ($differs & D_PAT_OTH) {
+ my $mode;
+ $differs &= ~D_PAT_OTH;
+ my $pat_oth = sub {
+ $differs |= D_PAT_OTH;
+ no warnings qw(exiting); last;
+ };
+ $rundiff->([qw(--name-status -r)], [qw(debian/patches/)], sub {
+ no warnings qw(exiting);
+ if (!defined $mode) {
+ $mode = $_; next;
+ }
+ die unless s{^debian/patches/}{};
+ my $ok;
+ if ($mode eq 'A' && !m/\.series$/s) {
+ $ok = 1;
+ } elsif ($mode eq 'M' && $_ eq 'series') {
+ my $x_s = (git_cat_file "$x:debian/patches/series", 'blob');
+ my $y_s = (git_cat_file "$y:debian/patches/series", 'blob');
+ chomp $x_s; $x_s .= "\n";
+ $ok = $x_s eq substr($y_s, 0, length $x_s);
+ } else {
+ # nope
+ }
+ $mode = undef;
+ $differs |= $ok ? D_PAT_ADD : D_PAT_OTH;
+ });
+ die "mysterious debian/patches changes $x..$y"
+ unless $differs & (D_PAT_ADD|D_PAT_OTH);
+ }
+
+ printdebug sprintf "get_differs %s %s = %#x\n", $x, $y, $differs;
-our $rd = ".git/git-debrebase";
-our $ud = "$rd/work";
+ return $differs;
+}
sub commit_pr_info ($) {
my ($r) = @_;
sub calculate_committer_authline () {
my $c = cmdoutput @git, qw(commit-tree --no-gpg-sign -m),
- 'DUMMY COMMIT (git-debrebase)', "$basis:";
+ 'DUMMY COMMIT (git-debrebase)', "HEAD:";
my ($h,$m) = get_commit $c;
$h =~ m/^committer .*$/m or confess "($h) ?";
return $&;
}
+sub rm_subdir_cached ($) {
+ my ($subdir) = @_;
+ runcmd @git, qw(rm --quiet -rf --cached --ignore-unmatch), $subdir;
+}
+
+sub read_tree_subdir ($$) {
+ my ($subdir, $new_tree_object) = @_;
+ rm_subdir_cached $subdir;
+ runcmd @git, qw(read-tree), "--prefix=$subdir/", $new_tree_object;
+}
+
+sub read_tree_debian ($) {
+ my ($treeish) = @_;
+ read_tree_subdir 'debian', "$treeish:debian";
+ rm_subdir_cached 'debian/patches';
+}
+
+sub read_tree_upstream ($;$$) {
+ my ($treeish, $keep_patches, $tree_with_debian) = @_;
+ # if $tree_with_debian is supplied, will use that for debian/
+ # otherwise will save and restore it.
+ my $debian =
+ $tree_with_debian ? "$tree_with_debian:debian"
+ : cmdoutput @git, qw(write-tree --prefix=debian/);
+ runcmd @git, qw(read-tree), $treeish;
+ read_tree_subdir 'debian', $debian;
+ rm_subdir_cached 'debian/patches' unless $keep_patches;
+};
+
+sub make_commit ($$) {
+ my ($parents, $message_paras) = @_;
+ my $tree = cmdoutput @git, qw(write-tree);
+ my @cmd = (@git, qw(commit-tree), $tree);
+ push @cmd, qw(-p), $_ foreach @$parents;
+ push @cmd, qw(-m), $_ foreach @$message_paras;
+ return cmdoutput @cmd;
+}
+
+our @snag_force_opts;
+sub snag ($$;@) {
+ my ($tag,$msg) = @_; # ignores extra args, for benefit of keycommits
+ if (grep { $_ eq $tag } @snag_force_opts) {
+ $snags_forced++;
+ print STDERR "git-debrebase: snag ignored (-f$tag): $msg\n";
+ } else {
+ $snags_tripped++;
+ print STDERR "git-debrebase: snag detected (-f$tag): $msg\n";
+ }
+}
+
+# Important: all mainline code must call snags_maybe_bail after
+# any point where snag might be called, but before making changes
+# (eg before any call to run_deferred_updates). snags_maybe_bail
+# may be called more than once if necessary (but this is not ideal
+# because then the messages about number of snags may be confusing).
+sub snags_maybe_bail () {
+ return if all_snags_summarised();
+ if ($snags_forced) {
+ printf STDERR
+ "%s: snags: %d overriden by individual -f options\n",
+ $us, $snags_forced;
+ }
+ if ($snags_tripped) {
+ if ($opt_force) {
+ printf STDERR
+ "%s: snags: %d overriden by global --force\n",
+ $us, $snags_tripped;
+ } else {
+ fail sprintf
+ "%s: snags: %d blocker(s) (you could -f<tag>, or --force)",
+ $us, $snags_tripped;
+ }
+ }
+ $snags_summarised = $snags_forced + $snags_tripped;
+}
+sub snags_maybe_bail_early () {
+ # useful to bail out early without doing a lot of work;
+ # not a substitute for snags_maybe_bail.
+ snags_maybe_bail() if $snags_tripped && !$opt_force;
+}
+sub any_snags () {
+ return $snags_forced || $snags_tripped;
+}
+
+sub gbp_pq_export ($$$) {
+ my ($bname, $base, $tip) = @_;
+ # must be run in a workarea. $bname and patch-queue/$bname
+ # ought not to exist. Leaves you on patch-queue/$bname with
+ # the patches staged but not committed.
+ printdebug "gbp_pq_export $bname $base $tip\n";
+ runcmd @git, qw(checkout -q -b), $bname, $base;
+ runcmd @git, qw(checkout -q -b), "patch-queue/$bname", $tip;
+ my @gbp_cmd = (qw(gbp pq export));
+ my $r = system shell_cmd 'exec >../gbp-pq-err 2>&1', @gbp_cmd;
+ if ($r) {
+ { local ($!,$?); copy('../gbp-pq-err', \*STDERR); }
+ failedcmd @gbp_cmd;
+ }
+ runcmd @git, qw(add -f debian/patches) if stat_exists 'debian/patches';
+}
+
+
+# xxx allow merge resolution separately from laundering, before git merge
+#
+# xxx general gdr docs highlight forbidden things
+# xxx general gdr docs list allowable things ?
+# xxx general gdr docs explicitly forbid some rebase
+#
+# xxx provide a way for the user to help
+# xxx (eg, provide wreckage provide way to continue)
+
+# later/rework?
+# use git-format-patch?
+# our own patch identification algorithm?
+# this is an alternative strategy
+
+sub merge_series ($$$;@) {
+ my ($newbase, $wrecknotes, $base_q, @input_qs) = @_;
+ # $base_q{SeriesBase} $input_qs[]{SeriesBase}
+ # $base_q{SeriesTip} $input_qs[]{SeriesTip}
+ # ^ specifies several patch series (currently we only support exactly 2)
+ # return value is a commit which is the result of
+ # merging the two versions of the same topic branch
+ # $input_q[0] and $input_q[1]
+ # with respect to the old version
+ # $base_q
+ # all onto $newbase.
+
+ # Creates, in *_q, a key MR for its private use
+
+ printdebug "merge_series newbase=$newbase\n";
+
+ $input_qs[$_]{MR}{S} = $_ foreach (0..$#input_qs);
+ $base_q->{MR}{S} = 'base';
+
+ my %prereq;
+ # $prereq{<patch filename>}{<possible prereq}{<S>} = 1 or absent
+ # $prereq{<patch filename>}{<possible prereq} exists or not (later)
+ # $prereq{<patch filename>} exists or not (even later)
+
+ my $result;
+
+ my $mwrecknote = sub {
+ my ($reftail, $commitish) = @_;
+ $wrecknotes->{$reftail} = $commitish;
+ };
+
+ local $workarea = fresh_playground "$playprefix/merge";
+ my $seriesfile = "debian/patches/series";
+ in_workarea sub {
+ playtree_setup();
+ foreach my $q ($base_q, reverse @input_qs) {
+ my $s = $q->{MR}{S};
+ gbp_pq_export "p-$s", $q->{SeriesBase}, $q->{SeriesTip};
+ my @earlier;
+ if (open S, $seriesfile) {
+ while (my $patch = <S>) {
+ chomp $patch or die $!;
+ $prereq{$patch} //= {};
+ foreach my $earlier (@earlier) {
+ $prereq{$patch}{$earlier}{$s}++ and die;
+ }
+ push @earlier, $patch;
+ stat "debian/patches/$patch" or die "$patch ?";
+ }
+ S->error and die "$seriesfile $!";
+ close S;
+ } else {
+ die "$seriesfile $!" unless $!==ENOENT;
+ }
+ read_tree_upstream $newbase, 1;
+ my $pec = make_commit [ grep { defined } $base_q->{MR}{PEC} ], [
+ "Convert $s to patch queue for merging",
+ "[git-debrebase merge-innards patch-queue import:".
+ " $q->{SeriesTip}]"
+ ];
+ printdebug "merge_series pec $pec ";
+ runcmd @git, qw(rm -q --ignore-unmatch --cached), $seriesfile;
+ $pec = make_commit [ $pec ], [
+ "Drop series file from $s to avoid merge trouble",
+ "[git-debrebase merge-innards patch-queue prep:".
+ " $q->{SeriesTip}]"
+ ];
+
+ read_tree_debian $newbase;
+ if (@earlier) {
+ read_tree_subdir 'debian/patches', "$pec:debian/patches";
+ } else {
+ rm_subdir_cached 'debian/patches';
+ }
+ $pec = make_commit [ $pec ], [
+ "Update debian/ (excluding patches) to final to avoid re-merging",
+ "debian/ was already merged and we need to just take that.",
+ "[git-debrebase merge-innards patch-queue packaging:".
+ " $q->{SeriesTip}]"
+ ];
+
+ printdebug "pec' $pec\n";
+ runcmd @git, qw(reset -q --hard), $pec;
+ $q->{MR}{PEC} = $pec;
+ $mwrecknote->("$q->{LeftRight}-patchqueue");
+ }
+ # now, because of reverse, we are on $input_q->{MR}{OQC}
+ runcmd @git, qw(checkout -q -b merge);
+ printdebug "merge_series merging...\n";
+ my @mergecmd = (@git, qw(merge --quiet --no-edit), "p-1");
+ debugcmd '+', @mergecmd;
+ $!=0; $?=-1;
+ if (system @mergecmd) {
+ failedcmd @mergecmd;
+ }
+
+ printdebug "merge_series merge ok, series...\n";
+ # We need to construct a new series file
+ # Firstly, resolve prereq
+ foreach my $f (sort keys %prereq) {
+ printdebug "merge_series patch\t$f\t";
+ if (!stat_exists "debian/patches/$f") {
+ print DEBUG " drop\n" if $debuglevel;
+ # git merge deleted it; that's how we tell it's not wanted
+ delete $prereq{$f};
+ next;
+ }
+ print DEBUG " keep\n" if $debuglevel;
+ foreach my $g (sort keys %{ $prereq{$f} }) {
+ my $gfp = $prereq{$f}{$g};
+ printdebug "merge_series prereq\t$f\t-> $g\t";
+ if (!!$gfp->{0} == !!$gfp->{1}
+ ? $gfp->{0}
+ : !$gfp->{base}) {
+ print DEBUG "\tkeep\n" if $debuglevel;
+ } else {
+ print DEBUG "\tdrop\n" if $debuglevel;
+ delete $prereq{$f}{$g};
+ }
+ }
+ }
+
+ my $unsat = sub {
+ my ($f) = @_;
+ return scalar keys %{ $prereq{$f} };
+ };
+
+ my $nodate = time + 1;
+ my %authordate;
+ # $authordate{<patch filename>};
+ my $authordate = sub {
+ my ($f) = @_;
+ $authordate{$f} //= do {
+ open PF, "<", "debian/patches/$f" or die "$f $!";
+ while (<PF>) {
+ return $nodate if m/^$/;
+ last if s{^Date: }{};
+ }
+ chomp;
+ return cmdoutput qw(date +%s -d), $_;
+ };
+ };
+
+ open NS, '>', $seriesfile or die $!;
+
+ while (keys %prereq) {
+ my $best;
+ foreach my $try (sort keys %prereq) {
+ if ($best) {
+ next if (
+ $unsat->($try) <=> $unsat->($best) or
+ $authordate->($try) <=> $authordate->($best) or
+ $try cmp $best
+ ) >= 0;
+ }
+ $best = $try;
+ }
+ printdebug "merge_series series next $best\n";
+ print NS "$best\n" or die $!;
+ delete $prereq{$best};
+ foreach my $gp (values %prereq) {
+ delete $gp->{$best};
+ }
+ }
+
+ runcmd @git, qw(add), $seriesfile;
+ runcmd @git, qw(commit --quiet -m), 'Merged patch queue form';
+ $mwrecknote->('merged-patchqueue', git_rev_parse 'HEAD');
+
+ printdebug "merge_series series gbp pq import\n";
+ runcmd qw(gbp pq import);
+
+ # OK now we are on patch-queue/merge, and we need to rebase
+ # onto the intended parent and drop the patches from each one
+
+ printdebug "merge_series series ok, building...\n";
+ my $build = $newbase;
+ my @lcmd = (@git, qw(rev-list --reverse merge..patch-queue/merge));
+ foreach my $c (grep /./, split /\n/, cmdoutput @lcmd) {
+ my $commit = git_cat_file $c, 'commit';
+ printdebug "merge_series series ok, building $c\n";
+ read_tree_upstream $c, 0, $newbase;
+ my $tree = cmdoutput @git, qw(write-tree);
+ $commit =~ s{^parent (\S+)$}{parent $build}m or confess;
+ $commit =~ s{^tree (\S+)$}{tree $tree}m or confess;
+ open C, ">", "../mcommit" or die $!;
+ print C $commit or die $!;
+ close C or die $!;
+ $build = cmdoutput @git, qw(hash-object -w -t commit ../mcommit);
+ }
+ $result = $build;
+ $mwrecknote->('merged-result', $result);
+
+ runcmd @git, qw(update-ref refs/heads/result), $result;
+
+ runcmd @git, qw(checkout -q -b debug);
+ runcmd @git, qw(commit --allow-empty -q -m M-INDEX);
+ runcmd @git, qw(add .);
+ runcmd @git, qw(commit --allow-empty -q -m M-WORKTREE);
+ my $mdebug = git_rev_parse 'HEAD';
+ printdebug sprintf "merge_series done debug=%s\n", $mdebug;
+ $mwrecknote->('merged-debug', $mdebug);
+ };
+ printdebug "merge_series returns $result\n";
+ return $result;
+}
+
# classify returns an info hash like this
# CommitId => $objid
# Hdr => # commit headers, including 1 final newline
#
# Types:
# Packaging
+# Changelog
# Upstream
# AddPatches
# Mixed
-# Unknown
#
# Pseudomerge
# has additional entres in classification result
# has additional entry in classification result
# OrigParents = [ subset of Parents ]
#
-# BreakwaterUpstreamMerge
+# Anchor
# has additional entry in classification result
-# OrigParents = [ subset of Parents ]
+# OrigParents = [ subset of Parents ] # singleton list
+#
+# TreatAsAnchor
+#
+# BreakwaterStart
+#
+# Unknown
+# has additional entry in classification result
+# Why => "prose"
-sub classify ($) {
- my ($objid) = @_;
+sub parsecommit ($;$) {
+ my ($objid, $p_ref) = @_;
+ # => hash with CommitId Hdr Msg Tree Parents
+ # Parents entries have only Ix CommitId
+ # $p_ref, if provided, must be [] and is used as a base for Parents
+
+ $p_ref //= [];
+ die if @$p_ref;
my ($h,$m) = get_commit $objid;
- my ($t) = $h =~ m/^tree (\w+)$/m or die $cur;
- my (@ph) = $h =~ m/^parent (\w+)$/m;
- my @p;
+ my ($t) = $h =~ m/^tree (\w+)$/m or die $objid;
+ my (@ph) = $h =~ m/^parent (\w+)$/mg;
my $r = {
CommitId => $objid,
- Hdr => $hdr,
+ Hdr => $h,
Msg => $m,
Tree => $t,
- Parents => \@p,
+ Parents => $p_ref,
};
foreach my $ph (@ph) {
- push @p, {
- Ix => $#p,
+ push @$p_ref, {
+ Ix => scalar @$p_ref,
CommitId => $ph,
- Differs => (get_differs $t, $ph),
};
}
+ return $r;
+}
+
+sub classify ($) {
+ my ($objid) = @_;
+
+ my @p;
+ my $r = parsecommit($objid, \@p);
+ my $t = $r->{Tree};
+
+ foreach my $p (@p) {
+ $p->{Differs} = (get_differs $p->{CommitId}, $t),
+ }
+
+ printdebug "classify $objid \$t=$t \@p",
+ (map { sprintf " %s/%#x", $_->{CommitId}, $_->{Differs} } @p),
+ "\n";
+
my $classify = sub {
my ($type, @rest) = @_;
- $r = { %r, Type => $type, @rest };
+ $r = { %$r, Type => $type, @rest };
+ if ($debuglevel) {
+ printdebug " = $type ".(dd $r)."\n";
+ }
return $r;
};
my $unknown = sub {
my ($why) = @_;
- $r = { %r, Type => Unknown };
+ $r = { %$r, Type => qw(Unknown), Why => $why };
+ printdebug " ** Unknown\n";
return $r;
+ };
+
+ if (grep { $_ eq $objid } @opt_anchors) {
+ return $classify->('TreatAsAnchor');
+ }
+
+ my @identical = grep { !$_->{Differs} } @p;
+ my ($stype, $series) = git_cat_file "$t:debian/patches/series";
+ my $haspatches = $stype ne 'missing' && $series =~ m/^\s*[^#\n\t ]/m;
+
+ if ($r->{Msg} =~ m{^\[git-debrebase anchor.*\]$}m) {
+ # multi-orig upstreams are represented with an anchor merge
+ # from a single upstream commit which combines the orig tarballs
+
+ # Every anchor tagged this way must be a merge.
+ # We are relying on the
+ # [git-debrebase anchor: ...]
+ # commit message annotation in "declare" anchor merges (which
+ # do not have any upstream changes), to distinguish those
+ # anchor merges from ordinary pseudomerges (which we might
+ # just try to strip).
+ #
+ # However, the user is going to be doing git-rebase a lot. We
+ # really don't want them to rewrite an anchor commit.
+ # git-rebase trips up on merges, so that is a useful safety
+ # catch.
+ #
+ # BreakwaterStart commits are also anchors in the terminology
+ # of git-debrebase(5), but they are untagged (and always
+ # manually generated).
+ #
+ # We cannot not tolerate any tagged linear commit (ie,
+ # BreakwaterStart commits tagged `[anchor:') because such a
+ # thing could result from an erroneous linearising raw git
+ # rebase of a merge anchor. That would represent a corruption
+ # of the branch. and we want to detect and reject the results
+ # of such corruption before it makes it out anywhere. If we
+ # reject it here then we avoid making the pseudomerge which
+ # would be needed to push it.
+
+ my $badanchor = sub { $unknown->("git-debrebase \`anchor' but @_"); };
+ @p == 2 or return $badanchor->("has other than two parents");
+ $haspatches and return $badanchor->("contains debian/patches");
+
+ # How to decide about l/r ordering of anchors ? git
+ # --topo-order prefers to expand 2nd parent first. There's
+ # already an easy rune to look for debian/ history anyway (git log
+ # debian/) so debian breakwater branch should be 1st parent; that
+ # way also there's also an easy rune to look for the upstream
+ # patches (--topo-order).
+
+ # Also this makes --first-parent be slightly more likely to
+ # be useful - it makes it provide a linearised breakwater history.
+
+ # Of course one can say somthing like
+ # gitk -- ':/' ':!/debian'
+ # to get _just_ the commits touching upstream files, and by
+ # the TREESAME logic in git-rev-list this will leave the
+ # breakwater into upstream at the first anchor. But that
+ # doesn't report debian/ changes at all.
+
+ # Other observations about gitk: by default, gitk seems to
+ # produce output in a different order to git-rev-list. I
+ # can't seem to find this documented anywhere. gitk
+ # --date-order DTRT. But, gitk always seems to put the
+ # parents from left to right, in order, so it's easy to see
+ # which way round a pseudomerge is.
+
+ $p[0]{IsOrigin} and $badanchor->("is an origin commit");
+ $p[1]{Differs} & ~DS_DEB and
+ $badanchor->("upstream files differ from left parent");
+ $p[0]{Differs} & ~D_UPS and
+ $badanchor->("debian/ differs from right parent");
+
+ return $classify->(qw(Anchor),
+ OrigParents => [ $p[1] ]);
}
if (@p == 1) {
my $d = $r->{Parents}[0]{Differs};
- if ($d == D_DPAT_ADD) {
+ if ($d == D_PAT_ADD) {
return $classify->(qw(AddPatches));
- } elsif ($d & (D_DPAT_ADD|D_DPAT_OTH)) {
+ } elsif ($d & (D_PAT_ADD|D_PAT_OTH)) {
return $unknown->("edits debian/patches");
- } elsif ($d == D_DEB) {
- return $classify->(qw(Packaging));
+ } elsif ($d & DS_DEB and !($d & ~DS_DEB)) {
+ my ($ty,$dummy) = git_cat_file "$p[0]{CommitId}:debian";
+ if ($ty eq 'tree') {
+ if ($d == D_DEB_CLOG) {
+ return $classify->(qw(Changelog));
+ } else {
+ return $classify->(qw(Packaging));
+ }
+ } elsif ($ty eq 'missing') {
+ return $classify->(qw(BreakwaterStart));
+ } else {
+ return $unknown->("parent's debian is not a directory");
+ }
} elsif ($d == D_UPS) {
return $classify->(qw(Upstream));
- } elsif ($d == D_DEB|D_UPS) {
+ } elsif ($d & DS_DEB and $d & D_UPS and !($d & ~(DS_DEB|D_UPS))) {
return $classify->(qw(Mixed));
} elsif ($d == 0) {
return $unknown->("no changes");
return $unknown->("origin commit");
}
- my @identical = grep { !$_->{Differs} } @p;
if (@p == 2 && @identical == 1) {
my @overwritten = grep { $_->{Differs} } @p;
confess "internal error $objid ?" unless @overwritten==1;
return $classify->(qw(Pseudomerge),
- Overwritten => $overwritten[0],
+ Overwritten => [ $overwritten[0] ],
Contributor => $identical[0]);
}
if (@p == 2 && @identical == 2) {
- my @bytime = nsort_by {
- my ($ph,$pm) = get_commit $_->{CommitId};
+ my $get_t = sub {
+ my ($ph,$pm) = get_commit $_[0]{CommitId};
$ph =~ m/^committer .* (\d+) [-+]\d+$/m or die "$_->{CommitId} ?";
$1;
- } @p;
+ };
+ my @bytime = @p;
+ my $order = $get_t->($bytime[0]) <=> $get_t->($bytime[1]);
+ if ($order > 0) { # newer first
+ } elsif ($order < 0) {
+ @bytime = reverse @bytime;
+ } else {
+ # same age, default to order made by -s ours
+ # that is, commit was made by someone who preferred L
+ }
return $classify->(qw(Pseudomerge),
SubType => qw(Ambiguous),
- Overwritten => $bytime[0],
- Contributor => $bytime[1]);
- }!
+ Contributor => $bytime[0],
+ Overwritten => [ $bytime[1] ]);
+ }
foreach my $p (@p) {
- my ($p_h, $p_m) = get_commit $p;
+ my ($p_h, $p_m) = get_commit $p->{CommitId};
$p->{IsOrigin} = $p_h !~ m/^parent \w+$/m;
($p->{IsDgitImport},) = $p_m =~ m/^\[dgit import ([0-9a-z]+) .*\]$/m;
}
- my @orig_ps = grep { ($_->{IsDgitImport}//'X') eq 'orig' };
- my $m2 = $m;
+ my @orig_ps = grep { ($_->{IsDgitImport}//'X') eq 'orig' } @p;
+ my $m2 = $r->{Msg};
if (!(grep { !$_->{IsOrigin} } @p) and
- (@origs >= @p - 1) and
+ (@orig_ps >= @p - 1) and
$m2 =~ s{^\[(dgit import unpatched .*)\]$}{[was: $1]}m) {
$r->{NewMsg} = $m2;
return $classify->(qw(DgitImportUnpatched),
OrigParents => \@orig_ps);
}
- my ($stype, $series) = git_cat_file "$t:debian/patches/series";
- my $haspatches = $stype ne 'missing' && $series =~ m/^\s*[^#\n\t ]/m;
+ if (@p == 2 and
+ $r->{Msg} =~ m{^\[git-debrebase merged-breakwater.*\]$}m) {
+ # xxx ^ metadata tag needs adding to (5)
+ return $classify->("MergedBreakwaters");
+ }
+ if ($r->{Msg} =~ m{^\[(git-debrebase|dgit)[: ].*\]$}m) {
+ return $unknown->("unknown kind of merge from $1");
+ }
+ if (@p > 2) {
+ return $unknown->("octopus merge");
+ }
- # How to decide about l/r ordering of breakwater merges ? git
- # --topo-order prefers to expand 2nd parent first. There's
- # already an easy rune to look for debian/ history anyway (git log
- # debian/) so debian breakwater branch should be 1st parent; that
- # way also there's also an easy rune to look for the upstream
- # patches (--topo-order).
- if (@p == 2 &&
- !$haspatches &&
- !$p[0]{IsOrigin} && # breakwater merge never starts with an origin
- !($p[0]{Differs} & ~D_DEB) &&
- !($p[1]{Differs} & ~D_UPS)) {
- return $classify->(qw(BreakwaterUpstreamMerge),
- OrigParents => [ $p[1] ]);
+ if (!$ENV{GIT_DEBREBASE_EXPERIMENTAL_MERGE}) {
+ return $unknown->("general two-parent merge");
}
- # xxx multi-.orig upstreams
- return $unknown->("complex merge");
+ return $classify->("VanillaMerge");
+}
+
+sub keycommits ($;$$$$$);
+
+sub mergedbreakwaters_anchor ($) {
+ my ($cl) = @_;
+ my $best_anchor;
+ foreach my $p (@{ $cl->{Parents} }) {
+ my ($panchor, $pbw) = keycommits $p->{CommitId},
+ undef,undef,undef,undef, 1;
+ $best_anchor = $panchor
+ if !defined $best_anchor
+ or is_fast_fwd $best_anchor, $panchor;
+ fail "inconsistent anchors in merged-breakwaters $p->{CommitId}"
+ unless is_fast_fwd $panchor, $best_anchor;
+ }
+ return $best_anchor;
+}
+
+sub keycommits ($;$$$$$) {
+ my ($head, $furniture, $unclean, $trouble, $fatal, $claimed_bw) = @_;
+ # => ($anchor, $breakwater)
+
+ # $unclean->("unclean-$tagsfx", $msg, $cl)
+ # $furniture->("unclean-$tagsfx", $msg, $cl)
+ # $dgitimport->("unclean-$tagsfx", $msg, $cl))
+ # is callled for each situation or commit that
+ # wouldn't be found in a laundered branch
+ # $furniture is for furniture commits such as might be found on an
+ # interchange branch (pseudomerge, d/patches, changelog)
+ # $trouble is for things whnich prevent the return of
+ # anchor and breakwater information; if that is ignored,
+ # then keycommits returns (undef, undef) instead.
+ # $fatal is for unprocessable commits, and should normally cause
+ # a failure. If ignored, agaion, (undef, undef) is returned.
+ #
+ # If $claimed_bw, this is supposed to be a breakwater commit.
+ #
+ # If a callback is undef, fail is called instead.
+ # If a callback is defined but false, the situation is ignored.
+ # Callbacks may say:
+ # no warnings qw(exiting); last;
+ # if the answer is no longer wanted.
+
+ my ($anchor, $breakwater);
+ $breakwater = $head if $claimed_bw;
+ my $clogonly;
+ my $cl;
+ my $found_pm;
+ $fatal //= sub { fail $_[1]; };
+ my $x = sub {
+ my ($cb, $tagsfx, $mainwhy, $xwhy) = @_;
+ my $why = $mainwhy.$xwhy;
+ my $m = "branch needs laundering (run git-debrebase): $why";
+ fail $m unless defined $cb;
+ return unless $cb;
+ $cb->("unclean-$tagsfx", $why, $cl, $mainwhy);
+ };
+ my $found_anchor = sub {
+ ($anchor) = @_;
+ $breakwater //= $clogonly;
+ $breakwater //= $head;
+ no warnings qw(exiting);
+ last;
+ };
+ for (;;) {
+ $cl = classify $head;
+ my $ty = $cl->{Type};
+ if ($ty eq 'Packaging') {
+ $breakwater //= $clogonly;
+ $breakwater //= $head;
+ } elsif ($ty eq 'Changelog') {
+ # this is going to count as the tip of the breakwater
+ # only if it has no upstream stuff before it
+ $clogonly //= $head;
+ } elsif ($ty eq 'Anchor' or
+ $ty eq 'TreatAsAnchor' or
+ $ty eq 'BreakwaterStart') {
+ $found_anchor->($head);
+ } elsif ($ty eq 'Upstream') {
+ $x->($unclean, 'ordering',
+ "packaging change ($breakwater) follows upstream change"," (eg $head)")
+ if defined $breakwater;
+ $clogonly = undef;
+ $breakwater = undef;
+ } elsif ($ty eq 'Mixed') {
+ $x->($unclean, 'mixed',
+ "found mixed upstream/packaging commit"," ($head)");
+ $clogonly = undef;
+ $breakwater = undef;
+ } elsif ($ty eq 'Pseudomerge' or
+ $ty eq 'AddPatches') {
+ my $found_pm = 1;
+ $x->($furniture, (lc $ty),
+ "found interchange bureaucracy commit ($ty)"," ($head)");
+ } elsif ($ty eq 'DgitImportUnpatched') {
+ if ($found_pm) {
+ $x->($trouble, 'dgitimport',
+ "found dgit dsc import"," ($head)");
+ return (undef,undef);
+ } else {
+ $x->($fatal, 'unprocessable',
+ "found bare dgit dsc import with no prior history",
+ " ($head)");
+ return (undef,undef);
+ }
+ } elsif ($ty eq 'VanillaMerge') {
+ $x->($trouble, 'vanillamerge',
+ "found vanilla merge"," ($head)");
+ return (undef,undef);
+ } elsif ($ty eq 'MergedBreakwaters') {
+ $found_anchor->(mergedbreakwaters_anchor $cl);
+ } else {
+ $x->($fatal, 'unprocessable',
+ "found unprocessable commit, cannot cope: $cl->{Why}",
+ " ($head)");
+ return (undef,undef);
+ }
+ $head = $cl->{Parents}[0]{CommitId};
+ }
+ return ($anchor, $breakwater);
}
-sub launder ($$$) {
- my ($input, $pseudos_must_overwrite_this, $wantdebonly) = @_;
+sub walk ($;$$$);
+sub walk ($;$$$) {
+ my ($input,
+ $nogenerate,$report, $report_lprefix) = @_;
+ # => ($tip, $breakwater_tip, $last_anchor)
+ # (or nothing, if $nogenerate)
+
+ printdebug "*** WALK $input ".($nogenerate//0)." ".($report//'-')."\n";
+ $report_lprefix //= '';
+
# go through commits backwards
- # we generate two lists of commits to apply
- my (@deb_cl, @ups_cl, @processed);
+ # we generate two lists of commits to apply:
+ # breakwater branch and upstream patches
+ my (@brw_cl, @upp_cl, @processed);
my %found;
+ my $upp_limit;
my @pseudomerges;
my $cl;
my $xmsg = sub {
- my ($appendinfo) = @_;
+ my ($prose, $info) = @_;
my $ms = $cl->{Msg};
chomp $ms;
- $ms .= "\n\n[git-debrebase $appendinfo]\n";
+ $info //= '';
+ $ms .= "\n\n[git-debrebase$info: $prose]\n";
return (Msg => $ms);
};
my $rewrite_from_here = sub {
- push @processed, { SpecialMethod => 'StartRewrite' };
+ my ($cl) = @_;
+ my $sp_cl = { SpecialMethod => 'StartRewrite' };
+ push @$cl, $sp_cl;
+ push @processed, $sp_cl;
};
-
my $cur = $input;
+ my $prdelim = "";
+ my $prprdelim = sub { print $report $prdelim if $report; $prdelim=""; };
+
+ my $prline = sub {
+ return unless $report;
+ print $report $prdelim, $report_lprefix, @_;
+ $prdelim = "\n";
+ };
+
+ my $bomb = sub { # usage: return $bomb->();
+ print $report " Unprocessable" if $report;
+ print $report " ($cl->{Why})" if $report && defined $cl->{Why};
+ $prprdelim->();
+ if ($nogenerate) {
+ return (undef,undef);
+ }
+ fail "found unprocessable commit, cannot cope".
+ (defined $cl->{Why} ? "; $cl->{Why}:": ':').
+ " (commit $cur) (d.".
+ (join ' ', map { sprintf "%#x", $_->{Differs} }
+ @{ $cl->{Parents} }).
+ ")";
+ };
+
+ my $build;
+ my $breakwater;
+
+ my $build_start = sub {
+ my ($msg, $parent) = @_;
+ $prline->(" $msg");
+ $build = $parent;
+ no warnings qw(exiting); last;
+ };
+
+ my $nomerge = sub {
+ fail "something useful about failed merge attempt @_ xxx".Dumper($cl);
+ };
+
+ my $mwrecknote = sub {
+ my ($reftail, $commitish) = @_;
+ $cl->{MergeWreckNotes}{$reftail} = $commitish;
+ };
+
+ my $last_anchor;
+
for (;;) {
$cl = classify $cur;
my $ty = $cl->{Type};
my $st = $cl->{SubType};
+ $prline->("$cl->{CommitId} $cl->{Type}");
$found{$ty. ( defined($st) ? "-$st" : '' )}++;
- my $p0 = $cl->{Parents}[0]{CommitId};
+ push @processed, $cl;
+ my $p0 = @{ $cl->{Parents} }==1 ? $cl->{Parents}[0]{CommitId} : undef;
if ($ty eq 'AddPatches') {
$cur = $p0;
- $rewrite_from_here->();
+ $rewrite_from_here->(\@upp_cl);
next;
- } elsif ($ty eq 'Packaging') {
- push @deb_cl, $cl;
- push @processed, $cl;
+ } elsif ($ty eq 'Packaging' or $ty eq 'Changelog') {
+ push @brw_cl, $cl;
$cur = $p0;
next;
+ } elsif ($ty eq 'BreakwaterStart') {
+ $last_anchor = $cur;
+ $build_start->('FirstPackaging', $cur);
} elsif ($ty eq 'Upstream') {
- push @ups_cl, $cl;
- push @processed, $cl;
+ push @upp_cl, $cl;
$cur = $p0;
next;
} elsif ($ty eq 'Mixed') {
my $queue = sub {
my ($q, $wh) = @_;
- my $cls = { $cl, $xmsg->("split mixed commit: $wh part") };
+ my $cls = { %$cl, $xmsg->("split mixed commit: $wh part") };
push @$q, $cls;
};
- $queue->(\@deb_cl, "debian");
- $queue->(\@ups_cl, "upstream");
- $rewrite_from_here->();
+ $queue->(\@brw_cl, "debian");
+ $queue->(\@upp_cl, "upstream");
+ $rewrite_from_here->(\@brw_cl);
+ $cur = $p0;
next;
} elsif ($ty eq 'Pseudomerge') {
- if (defined $pseudos_must_overwrite_this) {
- confess 'xxx actually check this';
- }
+ my $contrib = $cl->{Contributor}{CommitId};
+ print $report " Contributor=$contrib" if $report;
push @pseudomerges, $cl;
- $rewrite_from_here->();
- $cur = $ty->{Contributor};
+ $rewrite_from_here->(\@upp_cl);
+ $cur = $contrib;
next;
- } elsif ($ty eq 'BreakwaterUpstreamMerge') {
- $basis = $cur;
- last;
- } elsif ($ty eq 'DgitImportUnpatched' &&
- @pseudomerges == 1) {
- # This import has a tree which is just like a breakwater
- # tree, but it has the wrong history. Its ought to have
- # the previous breakwater (which dgit ought to have
- # generated a pseudomerge to overwrite) as an ancestor.
- # That will make the history of the debian/ files correct.
- # As for the upstream version: either it's the same upstream
- # as the previous breakwater, in which case that history is
- # precisely right. Otherwise, it was a non-gitish upload
- # of a new upstream version. We can tell these apart
- # by looking at the tree of the supposed upstream.
- if ($differs & D_UPS) {
- push @deb_cl, {
- %r,
- SpecialMethod => 'DgitImportUpstreamUpdate',
+ } elsif ($ty eq 'Anchor' or $ty eq 'TreatAsAnchor') {
+ $last_anchor = $cur;
+ $build_start->("Anchor", $cur);
+ } elsif ($ty eq 'DgitImportUnpatched') {
+ my $pm = $pseudomerges[-1];
+ if (defined $pm) {
+ # To an extent, this is heuristic. Imports don't have
+ # a useful history of the debian/ branch. We assume
+ # that the first pseudomerge after an import has a
+ # useful history of debian/, and ignore the histories
+ # from later pseudomerges. Often the first pseudomerge
+ # will be the dgit import of the upload to the actual
+ # suite intended by the non-dgit NMUer, and later
+ # pseudomerges may represent in-archive copies.
+ my $ovwrs = $pm->{Overwritten};
+ printf $report " PM=%s \@Overwr:%d",
+ $pm->{CommitId}, (scalar @$ovwrs)
+ if $report;
+ if (@$ovwrs != 1) {
+ printdebug "*** WALK BOMB DgitImportUnpatched\n";
+ return $bomb->();
+ }
+ my $ovwr = $ovwrs->[0]{CommitId};
+ printf $report " Overwr=%s", $ovwr if $report;
+ # This import has a tree which is just like a
+ # breakwater tree, but it has the wrong history. It
+ # ought to have the previous breakwater (which the
+ # pseudomerge overwrote) as an ancestor. That will
+ # make the history of the debian/ files correct. As
+ # for the upstream version: either it's the same as
+ # was ovewritten (ie, same as the previous
+ # breakwater), in which case that history is precisely
+ # right; or, otherwise, it was a non-gitish upload of a
+ # new upstream version. We can tell these apart by
+ # looking at the tree of the supposed upstream.
+ push @brw_cl, {
+ %$cl,
+ SpecialMethod => 'DgitImportDebianUpdate',
$xmsg->("convert dgit import: debian changes")
- };
+ }, {
+ %$cl,
+ SpecialMethod => 'DgitImportUpstreamUpdate',
+ $xmsg->("convert dgit import: upstream update",
+ " anchor")
+ };
+ $prline->(" Import");
+ $rewrite_from_here->(\@brw_cl);
+ $upp_limit //= $#upp_cl; # further, deeper, patches discarded
+ $cur = $ovwr;
+ next;
+ } else {
+ # Everything is from this import. This kind of import
+ # is already nearly in valid breakwater format, with the
+ # patches as commits. Unfortunately it contains
+ # debian/patches/.
+ printdebug "*** WALK BOMB bare dgit import\n";
+ $cl->{Why} = "bare dgit dsc import";
+ return $bomb->();
}
- push @deb_cl, {
- %r,
- SpecialMethod => 'DgitImportDebianUpdate',
- $xmsg->("convert dgit import: upstream changes")
- };
- my $differs = get_differs $previous_breakwater, $cl->{Tree};
- $basis = launder $pseudomerges[0]{Overwritten}, undef, 1;
- $rewrite_from_here->();
+ die "$ty ?";
+ } elsif ($ty eq 'MergedBreakwaters') {
+ $last_anchor = mergedbreakwaters_anchor $cl;
+ $build_start->(' MergedBreakwaters', $cur);
last;
- } else {
- die "Reached difficult commit $cur: ".Dumper($cl);
+ } elsif ($ty eq 'VanillaMerge') {
+ # User may have merged unstitched branch(es). We will
+ # have now lost what ffq-prev was then (since the later
+ # pseudomerge may introduce further changes). The effect
+ # of resolving such a merge is that we may have to go back
+ # further in history to find a merge base, since the one
+ # which was reachable via ffq-prev is no longer findable.
+ # This is suboptimal, but if it all works we'll have done
+ # the right thing.
+ # xxx we should warn the user in the docs about this
+
+ my $ok=1;
+ my $best_anchor;
+ # We expect to find a dominating anchor amongst the
+ # inputs' anchors. That will be the new anchor.
+ #
+ # More complicated is finding a merge base for the
+ # breakwaters. We need a merge base that is a breakwater
+ # commit. The ancestors of breakwater commits are more
+ # breakwater commits and possibly upstream commits and the
+ # ancestors of those upstream. Upstreams might have
+ # arbitrary ancestors. But any upstream commit U is
+ # either included in both anchors, in which case the
+ # earlier anchor is a better merge base than any of U's
+ # ancestors; or U is not included in the older anchor, in
+ # which case U is not an ancestor of the vanilla merge at
+ # all. So no upstream commit, nor any ancestor thereof,
+ # is a best merge base. As for non-breakwater Debian
+ # commits: these are never ancestors of any breakwater.
+ #
+ # So any best merge base as found by git-merge-base
+ # is a suitable breakwater anchor. Usually there will
+ # be only one.
+
+ printdebug "*** MERGE\n";
+
+ my @bwbcmd = (@git, qw(merge-base));
+ my @ibcmd = (@git, qw(merge-base --all));
+ my $might_be_in_bw = 1;
+
+ my $ps = $cl->{Parents};
+
+ $mwrecknote->('vanilla-merge', $cl->{CommitId});
+
+ foreach my $p (@$ps) {
+ $prline->(" VanillaMerge ".$p->{Ix});
+ $prprdelim->();
+ my ($ptip, $pbw, $panchor) =
+ walk $p->{CommitId}, 0, $report,
+ $report_lprefix.' ';
+ $p->{Laundered} = $p->{SeriesTip} = $ptip;
+ $p->{Breakwater} = $p->{SeriesBase} = $pbw;
+ $p->{Anchor} = $panchor;
+
+ my $lr = $p->{LeftRight} = (qw(left right))[$p->{Ix}];
+ $mwrecknote->("$lr-input", $p->{CommitId});
+
+ my $mwrecknote_parent = sub {
+ my ($which) = @_;
+ $mwrecknote->("$lr-".(lc $which), $p->{$which});
+ };
+ $mwrecknote_parent->('Laundered');
+ $mwrecknote_parent->('Breakwater');
+ $mwrecknote_parent->('Anchor');
+
+ $best_anchor = $panchor if
+ !defined $best_anchor or
+ is_fast_fwd $best_anchor, $panchor;
+
+ printdebug " MERGE BA best=".($best_anchor//'-').
+ " p=$panchor\n";
+ }
+
+ $mwrecknote->('result-anchor', $best_anchor);
+
+ foreach my $p (@$ps) {
+ $prline->(" VanillaMerge ".$p->{Ix});
+ if (!is_fast_fwd $p->{Anchor}, $best_anchor) {
+ $nomerge->('divergent anchors');
+ } elsif ($p->{Anchor} eq $best_anchor) {
+ print $report " SameAnchor" if $report;
+ } else {
+ print $report " SupersededAnchor" if $report;
+ }
+ if ($p->{Breakwater} eq $p->{CommitId}) {
+ # this parent commit was its own breakwater,
+ # ie it is part of the breakwater
+ print $report " Breakwater" if $report;
+ } else {
+ $might_be_in_bw = 0;
+ }
+ push @bwbcmd, $p->{Breakwater};
+ push @ibcmd, $p->{CommitId};
+ }
+
+ if ($ok && $might_be_in_bw) {
+ # We could rewrite this to contaion the metadata
+ # declaring it to be MergedBreakwaters, but
+ # unnecessarily rewriting a merge seems unhelpful.
+ $prline->(" VanillaMerge MergedBreakwaters");
+ $last_anchor = $best_anchor;
+ $build_start->('MergedBreakwaters', $cur);
+ }
+
+ my $bwb = cmdoutput @bwbcmd;
+
+ # OK, now we have a breakwater base, but we need the merge
+ # base for the interchange branch because we need the delta
+ # queue.
+ #
+ # This a the best merge base of our inputs which has the
+ # breakwater merge base as an ancestor.
+
+ my @ibs =
+ grep /./,
+ split /\n/,
+ cmdoutput @ibcmd;
+
+ @ibs or confess 'internal error, expected anchor at least ?';
+
+ my $ib;
+ my $ibleaf;
+ foreach my $tibix (0..$#ibs) {
+ my $tib = $ibs[$tibix];
+ my $ff = is_fast_fwd $bwb, $tib;
+ my $ok = !$ff ? 'rej' : $ib ? 'extra' : 'ok';
+ my $tibleaf = "interchange-mbcand-$ok-$tibix";
+ $mwrecknote->($tibleaf, $tib);
+ next unless $ff;
+ next if $ib;
+ $ib = $tib;
+ $ibleaf = $tibleaf;
+ }
+
+ $ib or $nomerge->("no suitable interchange merge base");
+
+ $prline->(" VanillaMerge Base");
+ $prprdelim->();
+ my ($btip, $bbw, $banchor) = eval {
+ walk $ib, 0, $report, $report_lprefix.' ';
+ };
+ $nomerge->("walking interchange branch merge base ($ibleaf): ".
+ $@) if length $@;
+
+ $mwrecknote->("mergebase-laundered", $btip);
+ $mwrecknote->("mergebase-breakwater", $bbw);
+ $mwrecknote->("mergebase-anchor", $banchor);
+
+ my $ibinfo = { SeriesTip => $btip,
+ SeriesBase => $bbw,
+ Anchor => $banchor,
+ LeftRight => 'mergebase' };
+
+ $bbw eq $bwb
+ or $nomerge->("interchange merge-base ($ib)'s".
+ " breakwater ($bbw)".
+ " != breakwaters' merge-base ($bwb)");
+
+ grep { $_->{Anchor} eq $ibinfo->{Anchor} } @$ps
+ or $nomerge->("interchange merge-base ($ib)'s".
+ " anchor ($ibinfo->{SeriesBase})".
+ " != any merge input's anchor (".
+ (join ' ', map { $_->{Anchor} } @$ps).
+ ")");
+
+ $cl->{MergeInterchangeBaseInfo} = $ibinfo;
+ $cl->{MergeBestAnchor} = $best_anchor;
+ push @brw_cl, {
+ %$cl,
+ SpecialMethod => 'MergeCreateMergedBreakwaters',
+ $xmsg->('constructed from vanilla merge',
+ ' merged-breakwater'),
+ };
+ push @upp_cl, {
+ %$cl,
+ SpecialMethod => 'MergeMergeSeries',
+ };
+ $build_start->('MergeBreakwaters', $cur);
+ } else {
+ printdebug "*** WALK BOMB unrecognised\n";
+ return $bomb->();
}
}
- # Now we build it back up again
+ $prprdelim->();
- workarea_fresh();
- in_workarea sub { xxx attributes xxx };
+ printdebug "*** WALK prep done cur=$cur".
+ " brw $#brw_cl upp $#upp_cl proc $#processed pm $#pseudomerges\n";
- my $rewriting = 1;
+ return if $nogenerate;
- my $build = $basis;
+ # Now we build it back up again
+
+ fresh_workarea();
+
+ my $rewriting = 0;
- my $rm_tree_cached = sub {
- my ($subdir) = @_;
- runcmd @git, qw(rm --quiet -rf --cached), $subdir;
- };
- my $read_tree_debian = sub {
- my ($treeish) = @_;
- $rm_tree_cached->(qw(debian));
- runcmd @git, qw(read-tree --prefix=debian/), "$treeish:debian";
- };
my $read_tree_upstream = sub {
my ($treeish) = @_;
- runcmd @git, qw(read-tree), $treeish;
- $read_tree_debian->($build);
+ read_tree_upstream $treeish, 0, $build;
};
+
+ $#upp_cl = $upp_limit if defined $upp_limit;
my $committer_authline = calculate_committer_authline();
+ printdebug "WALK REBUILD $build ".(scalar @processed)."\n";
+
+ confess "internal error" unless $build eq (pop @processed)->{CommitId};
+
in_workarea sub {
mkdir $rd or $!==EEXIST or die $!;
my $current_method;
- foreach my $cl (qw(Debian), (reverse @deb_cl),
+ runcmd @git, qw(read-tree), $build;
+ foreach my $cl (qw(Debian), (reverse @brw_cl),
{ SpecialMethod => 'RecordBreakwaterTip' },
- qw(Upstream), (reverse @ups_cl)) {
+ qw(Upstream), (reverse @upp_cl)) {
if (!ref $cl) {
$current_method = $cl;
next;
}
- $method = $cl->{SpecialMethod} // $current_method;
+ my $method = $cl->{SpecialMethod} // $current_method;
my @parents = ($build);
- my $cltree = $cl->{CommitId}
+ my $cltree = $cl->{CommitId};
+ printdebug "WALK BUILD ".($cltree//'undef').
+ " $method (rewriting=$rewriting)\n";
if ($method eq 'Debian') {
- $read_tree_debian->($cltree);
+ read_tree_debian($cltree);
} elsif ($method eq 'Upstream') {
$read_tree_upstream->($cltree);
} elsif ($method eq 'StartRewrite') {
$rewriting = 1;
next;
} elsif ($method eq 'RecordBreakwaterTip') {
- last if $wantdebonly;
$breakwater = $build;
next;
} elsif ($method eq 'DgitImportDebianUpdate') {
- $read_tree_debian->($cltree);
- $rm_tree_cached(qw(debian/patches));
+ read_tree_debian($cltree);
} elsif ($method eq 'DgitImportUpstreamUpdate') {
+ confess unless $rewriting;
+ my $differs = (get_differs $build, $cltree);
+ next unless $differs & D_UPS;
$read_tree_upstream->($cltree);
push @parents, map { $_->{CommitId} } @{ $cl->{OrigParents} };
- } else {
- confess "$method ?";
- }
- $rewriting ||= $cl ne pop @processed;
+ } elsif ($method eq 'MergeCreateMergedBreakwaters') {
+ print "Found a general merge, will try to tidy it up.\n";
+ $rewriting = 1;
+ $read_tree_upstream->($cl->{MergeBestAnchor});
+ $read_tree_upstream->($cl->{MergeBestAnchor});
+ read_tree_debian($cltree);
+ @parents = map { $_->{Breakwater} } @{ $cl->{Parents} };
+ } elsif ($method eq 'MergeMergeSeries') {
+ print "Running merge resolution for $cl->{CommitId}...\n";
+ $build = merge_series
+ $build, $cl->{MergeWreckNotes},
+ $cl->{MergeInterchangeBaseInfo},
+ @{ $cl->{Parents} };
+ $last_anchor = $cl->{MergeBestAnchor};
+
+ # Check for mismerges:
+ my $check = sub {
+ my ($against, $allow, $what) = @_;
+ my $differs = get_differs $build, $against;
+ $nomerge->(sprintf
+ "merge misresolved: %s are not the same (%s %s d.%#x)",
+ $what, $against, $build, $differs)
+ if $differs & ~($allow | D_PAT_ADD);
+ };
+
+ # Breakwater changes which were in each side of the
+ # merge will have been incorporated into the
+ # MergeCreateMergedBreakwaters output. Because the
+ # upstream series was rebased onto the new breakwater,
+ # so should all of the packaging changes which were in
+ # the input.
+ $check->($input, D_UPS, 'debian files');
+
+ # Upstream files are merge_series, which ought to
+ # have been identical to the original merge.
+ $check->($cl->{CommitId}, DS_DEB, 'upstream files');
+
+ print "Merge resolution successful.\n";
+ next;
+ } else {
+ confess "$method ?";
+ }
+ if (!$rewriting) {
+ my $procd = (pop @processed) // 'UNDEF';
+ if ($cl ne $procd) {
+ $rewriting = 1;
+ printdebug "WALK REWRITING NOW cl=$cl procd=$procd\n";
+ }
+ }
my $newtree = cmdoutput @git, qw(write-tree);
my $ch = $cl->{Hdr};
$ch =~ s{^tree .*}{tree $newtree}m or confess "$ch ?";
- $ch =~ s{^parent .*\n}{}m;
- $ch =~ s{(?=^author}{
- map { "parent $_\n" } @parents
+ $ch =~ s{^parent .*\n}{}mg;
+ $ch =~ s{(?=^author)}{
+ join '', map { "parent $_\n" } @parents
}me or confess "$ch ?";
- if ($rewrite) {
+ if ($rewriting) {
$ch =~ s{^committer .*$}{$committer_authline}m
or confess "$ch ?";
}
- my $cf = "$rd/m$rewrite"
- open CD, ">", $cf or die $!;
- print CD $ch, "\n", $cl->{Msg}; or die $!;
+ my $cf = "$rd/m$rewriting";
+ open CD, ">", $cf or die $!;
+ print CD $ch, "\n", $cl->{Msg} or die $!;
close CD or die $!;
my @cmd = (@git, qw(hash-object));
- push @cmd, qw(-w) if $rewrite;
+ push @cmd, qw(-w) if $rewriting;
push @cmd, qw(-t commit), $cf;
my $newcommit = cmdoutput @cmd;
- confess "$ch ?" unless $rewrite or $newcommit eq $cl->{CommitId};
+ confess "$ch ?" unless $rewriting or $newcommit eq $cl->{CommitId};
$build = $newcommit;
+ if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
+ $last_anchor = $cur;
+ }
}
};
- runcmd @git, qw(diff-tree --quiet),
- map { $wantdebonly ? "$_:debian" : $_ },
- $input, $build;
+ my $final_check = get_differs $build, $input;
+ die sprintf "internal error %#x %s %s", $final_check, $input, $build
+ if $final_check & ~D_PAT_ADD;
+
+ my @r = ($build, $breakwater, $last_anchor);
+ printdebug "*** WALK RETURN @r\n";
+ return @r
+}
- return ($build, $breakwater);
+sub get_head () {
+ git_check_unmodified();
+ return git_rev_parse qw(HEAD);
}
-sub get_head () { return git_rev_parse qw(HEAD); }
+sub update_head ($$$) {
+ my ($old, $new, $mrest) = @_;
+ push @deferred_updates, "update HEAD $new $old";
+ run_deferred_updates $mrest;
+}
-sub update_head ($$) {
+sub update_head_checkout ($$$) {
my ($old, $new, $mrest) = @_;
- runcmd @git, qw(update-ref -m), "git-debrebase $mrest", $new, $old;
+ update_head $old, $new, $mrest;
+ runcmd @git, qw(reset --hard);
+}
+
+sub update_head_postlaunder ($$$) {
+ my ($old, $tip, $reflogmsg) = @_;
+ return if $tip eq $old;
+ print "git-debrebase: laundered (head was $old)\n";
+ update_head $old, $tip, $reflogmsg;
+ # no tree changes except debian/patches
+ runcmd @git, qw(rm --quiet --ignore-unmatch -rf debian/patches);
+}
+
+sub currently_rebasing() {
+ foreach (qw(rebase-merge rebase-apply)) {
+ return 1 if stat_exists "$maindir_gitdir/$_";
+ }
+ return 0;
}
-sub cmd_launder () {
+sub bail_if_rebasing() {
+ fail "you are in the middle of a git-rebase already"
+ if currently_rebasing();
+}
+
+sub do_launder_head ($) {
+ my ($reflogmsg) = @_;
my $old = get_head();
- my ($tip,$breakwater) = launder $old, 0, undef, 0;
- update_head $old, $tip, 'launder'; # no tree changes! xxx debian/patches
- printf "# breakwater tip:\n%s\n", $breakwater;
+ record_ffq_auto();
+ my ($tip,$breakwater) = walk $old;
+ snags_maybe_bail();
+ update_head_postlaunder $old, $tip, $reflogmsg;
+ return ($tip,$breakwater);
+}
+
+sub cmd_launder_v0 () {
+ badusage "no arguments to launder-v0 allowed" if @ARGV;
+ my $old = get_head();
+ my ($tip,$breakwater,$last_anchor) = walk $old;
+ update_head_postlaunder $old, $tip, 'launder';
+ printf "# breakwater tip\n%s\n", $breakwater;
+ printf "# working tip\n%s\n", $tip;
+ printf "# last anchor\n%s\n", $last_anchor;
+}
+
+sub defaultcmd_rebase () {
+ push @ARGV, @{ $opt_defaultcmd_interactive // [] };
+ my ($tip,$breakwater) = do_launder_head 'launder for rebase';
+ runcmd @git, qw(rebase), @ARGV, $breakwater if @ARGV;
+}
+
+sub cmd_analyse () {
+ badusage "analyse does not support any options"
+ if @ARGV and $ARGV[0] =~ m/^-/;
+ badusage "too many arguments to analyse" if @ARGV>1;
+ my ($old) = @ARGV;
+ if (defined $old) {
+ $old = git_rev_parse $old;
+ } else {
+ $old = git_rev_parse 'HEAD';
+ }
+ my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
+ STDOUT->error and die $!;
+}
+
+sub ffq_prev_branchinfo () {
+ my $current = git_get_symref();
+ return gdr_ffq_prev_branchinfo($current);
+}
+
+sub ffq_check ($;$$) {
+ # calls $ff and/or $notff zero or more times
+ # then returns either (status,message) where status is
+ # exists
+ # detached
+ # weird-symref
+ # notbranch
+ # or (undef,undef, $ffq_prev,$gdrlast)
+ # $ff and $notff are called like this:
+ # $ff->("message for stdout\n");
+ # $notff->('snag-name', $message);
+ # normally $currentval should be HEAD
+ my ($currentval, $ff, $notff) =@_;
+
+ $ff //= sub { print $_[0] or die $!; };
+ $notff //= \&snag;
+
+ my ($status, $message, $current, $ffq_prev, $gdrlast)
+ = ffq_prev_branchinfo();
+ return ($status, $message) unless $status eq 'branch';
+
+ my $exists = git_get_ref $ffq_prev;
+ return ('exists',"$ffq_prev already exists") if $exists;
+
+ return ('not-branch', 'HEAD symref is not to refs/heads/')
+ unless $current =~ m{^refs/heads/};
+ my $branch = $';
+
+ my @check_specs = split /\;/, (cfg "branch.$branch.ffq-ffrefs",1) // '*';
+ my %checked;
+
+ printdebug "ffq check_specs @check_specs\n";
+
+ my $check = sub {
+ my ($lrref, $desc) = @_;
+ printdebug "ffq might check $lrref ($desc)\n";
+ my $invert;
+ for my $chk (@check_specs) {
+ my $glob = $chk;
+ $invert = $glob =~ s{^[!^]}{};
+ last if fnmatch $glob, $lrref;
+ }
+ return if $invert;
+ my $lrval = git_get_ref $lrref;
+ return unless length $lrval;
+
+ if (is_fast_fwd $lrval, $currentval) {
+ $ff->("OK, you are ahead of $lrref\n");
+ $checked{$lrref} = 1;
+ } elsif (is_fast_fwd $currentval, $lrval) {
+ $checked{$lrref} = -1;
+ $notff->('behind', "you are behind $lrref, divergence risk");
+ } else {
+ $checked{$lrref} = -1;
+ $notff->('diverged', "you have diverged from $lrref");
+ }
+ };
+
+ my $merge = cfg "branch.$branch.merge",1;
+ if (defined $merge and $merge =~ m{^refs/heads/}) {
+ my $rhs = $';
+ printdebug "ffq merge $rhs\n";
+ my $check_remote = sub {
+ my ($remote, $desc) = @_;
+ printdebug "ffq check_remote ".($remote//'undef')." $desc\n";
+ return unless defined $remote;
+ $check->("refs/remotes/$remote/$rhs", $desc);
+ };
+ $check_remote->((scalar cfg "branch.$branch.remote",1),
+ 'remote fetch/merge branch');
+ $check_remote->((scalar cfg "branch.$branch.pushRemote",1) //
+ (scalar cfg "branch.$branch.pushDefault",1),
+ 'remote push branch');
+ }
+ if ($branch =~ m{^dgit/}) {
+ $check->("refs/remotes/dgit/$branch", 'remote dgit branch');
+ } elsif ($branch =~ m{^master$}) {
+ $check->("refs/remotes/dgit/dgit/sid", 'remote dgit branch for sid');
+ }
+ return (undef, undef, $ffq_prev, $gdrlast);
+}
+
+sub record_ffq_prev_deferred () {
+ # => ('status', "message")
+ # 'status' may be
+ # deferred message is undef
+ # exists
+ # detached
+ # weird-symref
+ # notbranch
+ # if not ff from some branch we should be ff from, is an snag
+ # if "deferred", will have added something about that to
+ # @deferred_update_messages, and also maybe printed (already)
+ # some messages about ff checks
+ bail_if_rebasing();
+ my $currentval = get_head();
+
+ my ($status,$message, $ffq_prev,$gdrlast) = ffq_check $currentval;
+ return ($status,$message) if defined $status;
+
+ snags_maybe_bail();
+
+ push @deferred_updates, "update $ffq_prev $currentval $git_null_obj";
+ push @deferred_updates, "delete $gdrlast";
+ push @deferred_update_messages, "Recorded previous head for preservation";
+ return ('deferred', undef);
+}
+
+sub record_ffq_auto () {
+ my ($status, $message) = record_ffq_prev_deferred();
+ if ($status eq 'deferred' || $status eq 'exists') {
+ } else {
+ snag $status, "could not record ffq-prev: $message";
+ snags_maybe_bail();
+ }
+}
+
+sub ffq_prev_info () {
+ bail_if_rebasing();
+ # => ($ffq_prev, $gdrlast, $ffq_prev_commitish)
+ my ($status, $message, $current, $ffq_prev, $gdrlast)
+ = ffq_prev_branchinfo();
+ if ($status ne 'branch') {
+ snag $status, "could not check ffq-prev: $message";
+ snags_maybe_bail();
+ }
+ my $ffq_prev_commitish = $ffq_prev && git_get_ref $ffq_prev;
+ return ($ffq_prev, $gdrlast, $ffq_prev_commitish);
+}
+
+sub stitch ($$$$$) {
+ my ($old_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose) = @_;
+
+ push @deferred_updates, "delete $ffq_prev $ffq_prev_commitish";
+
+ if (is_fast_fwd $old_head, $ffq_prev_commitish) {
+ my $differs = get_differs $old_head, $ffq_prev_commitish;
+ unless ($differs & ~D_PAT_ADD) {
+ # ffq-prev is ahead of us, and the only tree changes it has
+ # are possibly addition of things in debian/patches/.
+ # Just wind forwards rather than making a pointless pseudomerge.
+ push @deferred_updates,
+ "update $gdrlast $ffq_prev_commitish $git_null_obj";
+ update_head_checkout $old_head, $ffq_prev_commitish,
+ "stitch (fast forward)";
+ return;
+ }
+ }
+ fresh_workarea();
+ # We make pseudomerges with L as the contributing parent.
+ # This makes git rev-list --first-parent work properly.
+ my $new_head = make_commit [ $old_head, $ffq_prev ], [
+ 'Declare fast forward / record previous work',
+ "[git-debrebase pseudomerge: $prose]",
+ ];
+ push @deferred_updates, "update $gdrlast $new_head $git_null_obj";
+ update_head $old_head, $new_head, "stitch: $prose";
+}
+
+sub do_stitch ($;$) {
+ my ($prose, $unclean) = @_;
+
+ my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
+ if (!$ffq_prev_commitish) {
+ fail "No ffq-prev to stitch." unless $opt_noop_ok;
+ return;
+ }
+ my $dangling_head = get_head();
+
+ keycommits $dangling_head, $unclean,$unclean,$unclean;
+ snags_maybe_bail();
+
+ stitch($dangling_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose);
+}
+
+sub upstream_commitish_search ($$) {
+ my ($upstream_version, $tried) = @_;
+ # todo: at some point maybe use git-deborig to do this
+ foreach my $tagpfx ('', 'v', 'upstream/') {
+ my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
+ my $new_upstream = git_get_ref "refs/tags/$tag";
+ push @$tried, $tag;
+ return $new_upstream if length $new_upstream;
+ }
+}
+
+sub resolve_upstream_version ($$) {
+ my ($new_upstream, $upstream_version) = @_;
+
+ if (!defined $new_upstream) {
+ my @tried;
+ $new_upstream = upstream_commitish_search $upstream_version, \@tried;
+ if (!length $new_upstream) {
+ fail "Could not determine appropriate upstream commitish.\n".
+ " (Tried these tags: @tried)\n".
+ " Check version, and specify upstream commitish explicitly.";
+ }
+ }
+ $new_upstream = git_rev_parse $new_upstream;
+
+ return $new_upstream;
+}
+
+sub cmd_new_upstream () {
+ # automatically and unconditionally launders before rebasing
+ # if rebase --abort is used, laundering has still been done
+
+ my %pieces;
+
+ badusage "need NEW-VERSION [UPS-COMMITTISH]" unless @ARGV >= 1;
+
+ # parse args - low commitment
+ my $spec_version = shift @ARGV;
+ my $new_version = (new Dpkg::Version $spec_version, check => 1);
+ fail "bad version number \`$spec_version'" unless defined $new_version;
+ if ($new_version->is_native()) {
+ $new_version = (new Dpkg::Version "$spec_version-1", check => 1);
+ }
+
+ my $new_upstream = shift @ARGV;
+ my $new_upstream_version = upstreamversion $new_version;
+ $new_upstream =
+ resolve_upstream_version $new_upstream, $new_upstream_version;
+
+ record_ffq_auto();
+
+ my $piece = sub {
+ my ($n, @x) = @_; # may be ''
+ my $pc = $pieces{$n} //= {
+ Name => $n,
+ Desc => ($n ? "upstream piece \`$n'" : "upstream (main piece"),
+ };
+ while (my $k = shift @x) { $pc->{$k} = shift @x; }
+ $pc;
+ };
+
+ my @newpieces;
+ my $newpiece = sub {
+ my ($n, @x) = @_; # may be ''
+ my $pc = $piece->($n, @x, NewIx => (scalar @newpieces));
+ push @newpieces, $pc;
+ };
+
+ $newpiece->('',
+ OldIx => 0,
+ New => $new_upstream,
+ );
+ while (@ARGV && $ARGV[0] !~ m{^-}) {
+ my $n = shift @ARGV;
+
+ badusage "for each EXTRA-UPS-NAME need EXTRA-UPS-COMMITISH"
+ unless @ARGV && $ARGV[0] !~ m{^-};
+
+ my $c = git_rev_parse shift @ARGV;
+ die unless $n =~ m/^$extra_orig_namepart_re$/;
+ $newpiece->($n, New => $c);
+ }
+
+ # now we need to investigate the branch this generates the
+ # laundered version but we don't switch to it yet
+ my $old_head = get_head();
+ my ($old_laundered_tip,$old_bw,$old_anchor) = walk $old_head;
+
+ my $old_bw_cl = classify $old_bw;
+ my $old_anchor_cl = classify $old_anchor;
+ my $old_upstream;
+ if (!$old_anchor_cl->{OrigParents}) {
+ snag 'anchor-treated',
+ 'old anchor is recognised due to --anchor, cannot check upstream';
+ } else {
+ $old_upstream = parsecommit
+ $old_anchor_cl->{OrigParents}[0]{CommitId};
+ $piece->('', Old => $old_upstream->{CommitId});
+ }
+
+ if ($old_upstream && $old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
+ if ($old_upstream->{Msg} =~
+ m{^\[git-debrebase upstream-combine (\.(?: $extra_orig_namepart_re)+)\:.*\]$}m
+ ) {
+ my @oldpieces = (split / /, $1);
+ my $old_n_parents = scalar @{ $old_upstream->{Parents} };
+ if ($old_n_parents != @oldpieces &&
+ $old_n_parents != @oldpieces + 1) {
+ snag 'upstream-confusing', sprintf
+ "previous upstream combine %s".
+ " mentions %d pieces (each implying one parent)".
+ " but has %d parents".
+ " (one per piece plus maybe a previous combine)",
+ $old_upstream->{CommitId},
+ (scalar @oldpieces),
+ $old_n_parents;
+ } elsif ($oldpieces[0] ne '.') {
+ snag 'upstream-confusing', sprintf
+ "previous upstream combine %s".
+ " first piece is not \`.'",
+ $oldpieces[0];
+ } else {
+ $oldpieces[0] = '';
+ foreach my $i (0..$#oldpieces) {
+ my $n = $oldpieces[$i];
+ my $hat = 1 + $i + ($old_n_parents - @oldpieces);
+ $piece->($n, Old => $old_upstream->{CommitId}.'^'.$hat);
+ }
+ }
+ } else {
+ snag 'upstream-confusing',
+ "previous upstream $old_upstream->{CommitId} is from".
+ " git-debrebase but not an \`upstream-combine' commit";
+ }
+ }
+
+ foreach my $pc (values %pieces) {
+ if (!$old_upstream) {
+ # we have complained already
+ } elsif (!$pc->{Old}) {
+ snag 'upstream-new-piece',
+ "introducing upstream piece \`$pc->{Name}'";
+ } elsif (!$pc->{New}) {
+ snag 'upstream-rm-piece',
+ "dropping upstream piece \`$pc->{Name}'";
+ } elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
+ snag 'upstream-not-ff',
+ "not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}";
+ }
+ }
+
+ printdebug "%pieces = ", (dd \%pieces), "\n";
+ printdebug "\@newpieces = ", (dd \@newpieces), "\n";
+
+ snags_maybe_bail();
+
+ my $new_bw;
+
+ fresh_workarea();
+ in_workarea sub {
+ my @upstream_merge_parents;
+
+ if (!any_snags()) {
+ push @upstream_merge_parents, $old_upstream->{CommitId};
+ }
+
+ foreach my $pc (@newpieces) { # always has '' first
+ if ($pc->{Name}) {
+ read_tree_subdir $pc->{Name}, $pc->{New};
+ } else {
+ runcmd @git, qw(read-tree), $pc->{New};
+ }
+ push @upstream_merge_parents, $pc->{New};
+ }
+
+ # index now contains the new upstream
+
+ if (@newpieces > 1) {
+ # need to make the upstream subtree merge commit
+ $new_upstream = make_commit \@upstream_merge_parents,
+ [ "Combine upstreams for $new_upstream_version",
+ ("[git-debrebase upstream-combine . ".
+ (join " ", map { $_->{Name} } @newpieces[1..$#newpieces]).
+ ": new upstream]"),
+ ];
+ }
+
+ # $new_upstream is either the single upstream commit, or the
+ # combined commit we just made. Either way it will be the
+ # "upstream" parent of the anchor merge.
+
+ read_tree_subdir 'debian', "$old_bw:debian";
+
+ # index now contains the anchor merge contents
+ $new_bw = make_commit [ $old_bw, $new_upstream ],
+ [ "Update to upstream $new_upstream_version",
+ "[git-debrebase anchor: new upstream $new_upstream_version, merge]",
+ ];
+
+ my $clogsignoff = cmdoutput qw(git show),
+ '--pretty=format:%an <%ae> %aD',
+ $new_bw;
+
+ # Now we have to add a changelog stanza so the Debian version
+ # is right.
+ die if unlink "debian";
+ die $! unless $!==ENOENT or $!==ENOTEMPTY;
+ unlink "debian/changelog" or $!==ENOENT or die $!;
+ mkdir "debian" or die $!;
+ open CN, ">", "debian/changelog" or die $!;
+ my $oldclog = git_cat_file ":debian/changelog";
+ $oldclog =~ m/^($package_re) \(\S+\) / or
+ fail "cannot parse old changelog to get package name";
+ my $p = $1;
+ print CN <<END, $oldclog or die $!;
+$p ($new_version) UNRELEASED; urgency=medium
+
+ * Update to new upstream version $new_upstream_version.
+
+ -- $clogsignoff
+
+END
+ close CN or die $!;
+ runcmd @git, qw(update-index --add --replace), 'debian/changelog';
+
+ # Now we have the final new breakwater branch in the index
+ $new_bw = make_commit [ $new_bw ],
+ [ "Update changelog for new upstream $new_upstream_version",
+ "[git-debrebase: new upstream $new_upstream_version, changelog]",
+ ];
+ };
+
+ # we have constructed the new breakwater. we now need to commit to
+ # the laundering output, because git-rebase can't easily be made
+ # to make a replay list which is based on some other branch
+
+ update_head_postlaunder $old_head, $old_laundered_tip,
+ 'launder for new upstream';
+
+ my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw, @ARGV);
+ local $ENV{GIT_REFLOG_ACTION} = git_reflog_action_msg
+ "debrebase new-upstream $new_version: rebase";
+ runcmd @cmd;
+ # now it's for the user to sort out
+}
+
+sub cmd_record_ffq_prev () {
+ badusage "no arguments allowed" if @ARGV;
+ my ($status, $msg) = record_ffq_prev_deferred();
+ if ($status eq 'exists' && $opt_noop_ok) {
+ print "Previous head already recorded\n" or die $!;
+ } elsif ($status eq 'deferred') {
+ run_deferred_updates 'record-ffq-prev';
+ } else {
+ fail "Could not preserve: $msg";
+ }
+}
+
+sub cmd_anchor () {
+ badusage "no arguments allowed" if @ARGV;
+ my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
+ print "$bw\n" or die $!;
+}
+
+sub cmd_breakwater () {
+ badusage "no arguments allowed" if @ARGV;
+ my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
+ print "$bw\n" or die $!;
+}
+
+sub cmd_status () {
+ badusage "no arguments allowed" if @ARGV;
+
+ # todo: gdr status should print divergence info
+ # todo: gdr status should print upstream component(s) info
+ # todo: gdr should leave/maintain some refs with this kind of info ?
+
+ my $oldest = { Badness => 0 };
+ my $newest;
+ my $note = sub {
+ my ($badness, $ourmsg, $snagname, $dummy, $cl, $kcmsg) = @_;
+ if ($oldest->{Badness} < $badness) {
+ $oldest = $newest = undef;
+ }
+ $oldest = {
+ Badness => $badness,
+ CommitId => $cl->{CommitId},
+ OurMsg => $ourmsg,
+ KcMsg => $kcmsg,
+ };
+ $newest //= $oldest;
+ };
+ my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'),
+ sub { $note->(1, 'branch contains furniture (not laundered)', @_); },
+ sub { $note->(2, 'branch is unlaundered', @_); },
+ sub { $note->(3, 'branch needs laundering', @_); },
+ sub { $note->(4, 'branch not in git-debrebase form', @_); };
+
+ my $prcommitinfo = sub {
+ my ($cid) = @_;
+ flush STDOUT or die $!;
+ runcmd @git, qw(--no-pager log -n1),
+ '--pretty=format: %h %s%n',
+ $cid;
+ };
+
+ print "current branch contents, in git-debrebase terms:\n";
+ if (!$oldest->{Badness}) {
+ print " branch is laundered\n";
+ } else {
+ print " $oldest->{OurMsg}\n";
+ my $printed = '';
+ foreach my $info ($oldest, $newest) {
+ my $cid = $info->{CommitId};
+ next if $cid eq $printed;
+ $printed = $cid;
+ print " $info->{KcMsg}\n";
+ $prcommitinfo->($cid);
+ }
+ }
+
+ my $prab = sub {
+ my ($cid, $what) = @_;
+ if (!defined $cid) {
+ print " $what is not well-defined\n";
+ } else {
+ print " $what\n";
+ $prcommitinfo->($cid);
+ }
+ };
+ print "key git-debrebase commits:\n";
+ $prab->($anchor, 'anchor');
+ $prab->($bw, 'breakwater');
+
+ my ($ffqstatus, $ffq_msg, $current, $ffq_prev, $gdrlast) =
+ ffq_prev_branchinfo();
+
+ print "branch and ref status, in git-debrebase terms:\n";
+ if ($ffq_msg) {
+ print " $ffq_msg\n";
+ } else {
+ $ffq_prev = git_get_ref $ffq_prev;
+ $gdrlast = git_get_ref $gdrlast;
+ if ($ffq_prev) {
+ print " unstitched; previous tip was:\n";
+ $prcommitinfo->($ffq_prev);
+ } elsif (!$gdrlast) {
+ print " stitched? (no record of git-debrebase work)\n";
+ } elsif (is_fast_fwd $gdrlast, 'HEAD') {
+ print " stitched\n";
+ } else {
+ print " not git-debrebase (diverged since last stitch)\n"
+ }
+ }
+ print "you are currently rebasing\n" if currently_rebasing();
+}
+
+sub cmd_stitch () {
+ my $prose = 'stitch';
+ getoptions("stitch",
+ 'prose=s', \$prose);
+ badusage "no arguments allowed" if @ARGV;
+ do_stitch $prose, 0;
+}
+sub cmd_prepush () { cmd_stitch(); }
+
+sub cmd_quick () {
+ badusage "no arguments allowed" if @ARGV;
+ do_launder_head 'launder for git-debrebase quick';
+ do_stitch 'quick';
+}
+
+sub cmd_conclude () {
+ my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
+ if (!$ffq_prev_commitish) {
+ fail "No ongoing git-debrebase session." unless $opt_noop_ok;
+ return;
+ }
+ my $dangling_head = get_head();
+
+ badusage "no arguments allowed" if @ARGV;
+ do_launder_head 'launder for git-debrebase quick';
+ do_stitch 'quick';
+}
+
+sub cmd_scrap () {
+ if (currently_rebasing()) {
+ runcmd @git, qw(rebase --abort);
+ }
+ my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
+ if (!$ffq_prev_commitish) {
+ fail "No ongoing git-debrebase session." unless $opt_noop_ok;
+ finish 0;
+ }
+ my $scrapping_head = get_head();
+ badusage "no arguments allowed" if @ARGV;
+ push @deferred_updates,
+ "update $gdrlast $ffq_prev_commitish $git_null_obj",
+ "update $ffq_prev $git_null_obj $ffq_prev_commitish";
+ snags_maybe_bail();
+ update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
+}
+
+sub make_patches_staged ($) {
+ my ($head) = @_;
+ # Produces the patches that would result from $head if it were
+ # laundered.
+ my ($secret_head, $secret_bw, $last_anchor) = walk $head;
+ fresh_workarea();
+ in_workarea sub {
+ gbp_pq_export 'bw', $secret_bw, $secret_head;
+ };
+}
+
+sub make_patches ($) {
+ my ($head) = @_;
+ keycommits $head, 0, \&snag;
+ make_patches_staged $head;
+ my $out;
+ in_workarea sub {
+ my $ptree = cmdoutput @git, qw(write-tree --prefix=debian/patches/);
+ runcmd @git, qw(read-tree), $head;
+ read_tree_subdir 'debian/patches', $ptree;
+ $out = make_commit [$head], [
+ 'Commit patch queue (exported by git-debrebase)',
+ '[git-debrebase: export and commit patches]',
+ ];
+ };
+ return $out;
+}
+
+sub cmd_make_patches () {
+ my $opt_quiet_would_amend;
+ getoptions("make-patches",
+ 'quiet-would-amend!', \$opt_quiet_would_amend);
+ badusage "no arguments allowed" if @ARGV;
+ bail_if_rebasing();
+ my $old_head = get_head();
+ my $new = make_patches $old_head;
+ my $d = get_differs $old_head, $new;
+ if ($d == 0) {
+ fail "No (more) patches to export." unless $opt_noop_ok;
+ return;
+ } elsif ($d == D_PAT_ADD) {
+ snags_maybe_bail();
+ update_head_checkout $old_head, $new, 'make-patches';
+ } else {
+ print STDERR failmsg
+ "Patch export produced patch amendments".
+ " (abandoned output commit $new).".
+ " Try laundering first."
+ unless $opt_quiet_would_amend;
+ finish 7;
+ }
+}
+
+sub cmd_convert_from_gbp () {
+ badusage "want only 1 optional argument, the upstream git commitish"
+ unless @ARGV<=1;
+
+ my $clogp = parsechangelog();
+ my $version = $clogp->{'Version'}
+ // die "missing Version from changelog";
+
+ my ($upstream_spec) = @ARGV;
+
+ my $upstream_version = upstreamversion $version;
+ my $upstream =
+ resolve_upstream_version($upstream_spec, $upstream_version);
+
+ my $old_head = get_head();
+
+ my $upsdiff = get_differs $upstream, $old_head;
+ if ($upsdiff & D_UPS) {
+ runcmd @git, qw(--no-pager diff --stat),
+ $upstream, $old_head,
+ qw( -- :!/debian :/);
+ fail <<END;
+upstream ($upstream_spec) and HEAD are not
+identical in upstream files. See diffstat above, or run
+ git diff $upstream_spec HEAD -- :!/debian :/
+END
+ }
+
+ if (!is_fast_fwd $upstream, $old_head) {
+ snag 'upstream-not-ancestor',
+ "upstream ($upstream) is not an ancestor of HEAD";
+ } else {
+ my $wrong = cmdoutput
+ (@git, qw(rev-list --ancestry-path), "$upstream..HEAD",
+ qw(-- :/ :!/debian));
+ if (length $wrong) {
+ snag 'unexpected-upstream-changes',
+ "history between upstream ($upstream) and HEAD contains direct changes to upstream files - are you sure this is a gbp (patches-unapplied) branch?";
+ print STDERR "list expected changes with: git log --stat --ancestry-path $upstream_spec..HEAD -- :/ ':!/debian'\n";
+ }
+ }
+
+ if ((git_cat_file "$upstream:debian")[0] ne 'missing') {
+ snag 'upstream-has-debian',
+ "upstream ($upstream) contains debian/ directory";
+ }
+
+ my $previous_dgit_view = eval {
+ my @clogcmd = qw(dpkg-parsechangelog --format rfc822 -n2);
+ my ($lvsn, $suite);
+ parsechangelog_loop \@clogcmd, 'debian/changelog', sub {
+ my ($stz, $desc) = @_;
+ no warnings qw(exiting);
+ printdebug 'CHANGELOG ', Dumper($desc, $stz);
+ next unless $stz->{Date};
+ next unless $stz->{Distribution} ne 'UNRELEASED';
+ $lvsn = $stz->{Version};
+ $suite = $stz->{Distribution};
+ last;
+ };
+ die "neither of the first two changelog entries are released\n"
+ unless defined $lvsn;
+ print "last finished-looking changelog entry: ($lvsn) $suite\n";
+ my $mtag_pat = debiantag_maintview $lvsn, '*';
+ my $mtag = cmdoutput @git, qw(describe --always --abbrev=0 --match),
+ $mtag_pat;
+ die "could not find suitable maintainer view tag $mtag_pat\n"
+ unless $mtag_pat =~ m{/};
+ is_fast_fwd $mtag, 'HEAD' or
+ die "HEAD is not FF from maintainer tag $mtag!";
+ my $dtag = "archive/$mtag";
+ is_fast_fwd $mtag, $dtag or
+ die "dgit view tag $dtag is not FF from maintainer tag $mtag";
+ print "will stitch in dgit view, $dtag\n";
+ git_rev_parse $dtag;
+ };
+ if (!$previous_dgit_view) {
+ $@ =~ s/^\n+//;
+ chomp $@;
+ print STDERR "cannot stitch in dgit view: $@\n";
+ }
+
+ snags_maybe_bail_early();
+
+ my $work;
+
+ fresh_workarea();
+ in_workarea sub {
+ runcmd @git, qw(checkout -q -b gdr-internal), $old_head;
+ # make a branch out of the patch queue - we'll want this in a mo
+ runcmd qw(gbp pq import);
+ # strip the patches out
+ runcmd @git, qw(checkout -q gdr-internal~0);
+ rm_subdir_cached 'debian/patches';
+ $work = make_commit ['HEAD'], [
+ 'git-debrebase convert-from-gbp: drop patches from tree',
+ 'Delete debian/patches, as part of converting to git-debrebase format.',
+ '[git-debrebase convert-from-gbp: drop patches from tree]'
+ ];
+ # make the anchor merge
+ # the tree is already exactly right
+ $work = make_commit [$work, $upstream], [
+ 'git-debrebase import: declare upstream',
+ 'First breakwater merge.',
+ '[git-debrebase anchor: declare upstream]'
+ ];
+
+ # rebase the patch queue onto the new breakwater
+ runcmd @git, qw(reset --quiet --hard patch-queue/gdr-internal);
+ runcmd @git, qw(rebase --quiet --onto), $work, qw(gdr-internal);
+ $work = git_rev_parse 'HEAD';
+
+ if ($previous_dgit_view) {
+ $work = make_commit [$work, $previous_dgit_view], [
+ 'git-debrebase import: declare ff from dgit archive view',
+ '[git-debrebase pseudomerge: import-from-gbp]',
+ ];
+ }
+ };
+
+ ffq_check $work;
+ snags_maybe_bail();
+ update_head_checkout $old_head, $work, 'convert-from-gbp';
}
-my $toplevel = runcmd @git, qw(rev-parse --show-toplevel);
+sub cmd_convert_to_gbp () {
+ badusage "no arguments allowed" if @ARGV;
+ my $head = get_head();
+ my (undef, undef, undef, $ffq, $gdrlast) = ffq_prev_branchinfo();
+ keycommits $head, 0;
+ my $out;
+ make_patches_staged $head;
+ in_workarea sub {
+ $out = make_commit ['HEAD'], [
+ 'Commit patch queue (converted from git-debrebase format)',
+ '[git-debrebase convert-to-gbp: commit patches]',
+ ];
+ };
+ if (defined $ffq) {
+ push @deferred_updates, "delete $ffq";
+ push @deferred_updates, "delete $gdrlast";
+ }
+ snags_maybe_bail();
+ update_head_checkout $head, $out, "convert to gbp (v0)";
+ print <<END or die $!;
+git-debrebase: converted to git-buildpackage branch format
+git-debrebase: WARNING: do not now run "git-debrebase" any more
+git-debrebase: WARNING: doing so would drop all upstream patches!
+END
+}
+
+sub cmd_convert_from_dgit_view () {
+ my $clogp = parsechangelog();
+
+ my $bpd = (cfg 'dgit.default.build-products-dir',1) // '..';
+ my $do_origs = 1;
+ my $do_tags = 1;
+ my $always = 0;
+ my $diagnose = 0;
+
+ getoptions("convert-from-dgit-view",
+ 'diagnose!', \$diagnose,
+ 'build-products-dir:s', \$bpd,
+ 'origs!', \$do_origs,
+ 'tags!', \$do_tags,
+ 'always-convert-anyway!', \$always);
+ fail "takes 1 optional argument, the upstream commitish" if @ARGV>1;
+
+ my @upstreams;
+
+ if (@ARGV) {
+ my $spec = shift @ARGV;
+ my $commit = git_rev_parse "$spec^{commit}";
+ push @upstreams, { Commit => $commit,
+ Source => "$ARGV[0], from command line",
+ Only => 1,
+ };
+ }
+
+ my $head = get_head();
+
+ if (!$always) {
+ my $troubles = 0;
+ my $trouble = sub { $troubles++; };
+ keycommits $head, sub{}, sub{}, $trouble, $trouble;
+ printdebug "troubles=$troubles\n";
+ if (!$troubles) {
+ print STDERR <<END;
+$us: Branch already seems to be in git-debrebase format!
+$us: --always-convert-anyway would do the conversion operation anyway
+$us: but is probably a bad idea. Probably, you wanted to do nothing.
+END
+ fail "Branch already in git-debrebase format." unless $opt_noop_ok;
+ finish 0;
+ }
+ }
+
+ snags_maybe_bail_early();
+
+ my $version = upstreamversion $clogp->{Version};
+ print STDERR "Considering possible commits corresponding to upstream:\n";
+
+ if (!@upstreams) {
+ if ($do_tags) {
+ my @tried;
+ my $ups_tag = upstream_commitish_search $version, \@tried;
+ if ($ups_tag) {
+ my $this = "git tag $tried[-1]";
+ push @upstreams, { Commit => $ups_tag,
+ Source => $this,
+ };
+ } else {
+ printf STDERR
+ " git tag: no suitable tag found (tried %s)\n",
+ "@tried";
+ }
+ }
+ if ($do_origs) {
+ my $p = $clogp->{'Source'};
+ # we do a quick check to see if there are plausible origs
+ my $something=0;
+ if (!opendir BPD, $bpd) {
+ die "$bpd: opendir: $!" unless $!==ENOENT;
+ } else {
+ while ($!=0, my $f = readdir BPD) {
+ next unless is_orig_file_of_p_v $f, $p, $version;
+ printf STDERR
+ " orig: found what looks like a .orig, %s\n",
+ "$bpd/$f";
+ $something=1;
+ last;
+ }
+ die "read $bpd: $!" if $!;
+ closedir BPD;
+ }
+ if ($something) {
+ my $tree = cmdoutput
+ @dgit, qw(--build-products-dir), $bpd,
+ qw(print-unapplied-treeish);
+ fresh_workarea();
+ in_workarea sub {
+ runcmd @git, qw(reset --quiet), $tree, qw(-- .);
+ rm_subdir_cached 'debian';
+ $tree = cmdoutput @git, qw(write-tree);
+ my $ups_synth = make_commit [], [ <<END, <<END,
+Import effective orig tree for upstream version $version
+END
+This includes the contents of the .orig(s), minus any debian/ directory.
+
+[git-debrebase import-from-dgit-view upstream-import-convert: $version]
+END
+ ];
+ push @upstreams, { Commit => $ups_synth,
+ Source => "orig(s) imported via dgit",
+ };
+ }
+ } else {
+ printf STDERR
+ " orig: no suitable origs found (looked for %s in %s)\n",
+ "${p}_".(stripeoch $version)."...", $bpd;
+ }
+ }
+ }
+
+ my $some_patches = stat_exists 'debian/patches/series';
+
+ print STDERR "Evaluating possible commits corresponding to upstream:\n";
+
+ my $result;
+ foreach my $u (@upstreams) {
+ my $work = $head;
+ fresh_workarea();
+ in_workarea sub {
+ runcmd @git, qw(reset --quiet), $u->{Commit}, qw(-- .);
+ runcmd @git, qw(checkout), $u->{Commit}, qw(-- .);
+ runcmd @git, qw(clean -xdff);
+ runcmd @git, qw(checkout), $head, qw(-- debian);
+ if ($some_patches) {
+ rm_subdir_cached 'debian/patches';
+ $work = make_commit [ $work ], [
+ 'git-debrebase convert-from-dgit-view: drop upstream changes from breakwater',
+ "Drop upstream changes, and delete debian/patches, as part of converting\n".
+ "to git-debrebase format. Upstream changes will appear as commits.",
+ '[git-debrebase convert-from-dgit-view: drop patches from tree]'
+ ];
+ }
+ $work = make_commit [ $work, $u->{Commit} ], [
+ 'git-debrebase convert-from-dgit-view: declare upstream',
+ '(Re)constructed breakwater merge.',
+ '[git-debrebase anchor: declare upstream]'
+ ];
+ runcmd @git, qw(checkout --quiet -b mk), $work;
+ if ($some_patches) {
+ runcmd @git, qw(checkout), $head, qw(-- debian/patches);
+ runcmd @git, qw(reset --quiet);
+ my @gbp_cmd = (qw(gbp pq import));
+ if (!$diagnose) {
+ my $gbp_err = "../gbp-pq-err";
+ @gbp_cmd = shell_cmd "exec >$gbp_err 2>&1", @gbp_cmd;
+ }
+ my $r = system @gbp_cmd;
+ if ($r) {
+ printf STDERR
+ " %s: couldn't apply patches: gbp pq %s",
+ $u->{Source}, waitstatusmsg();
+ return;
+ }
+ }
+ my $work = git_rev_parse qw(HEAD);
+ my $diffout = cmdoutput @git, qw(diff-tree --stat HEAD), $work;
+ if (length $diffout) {
+ print STDERR
+ " $u->{Source}: applying patches gives different tree\n";
+ print STDERR $diffout if $diagnose;
+ return;
+ }
+ # OMG!
+ $u->{Result} = $work;
+ $result = $u;
+ };
+ last if $result;
+ }
+
+ if (!$result) {
+ fail <<END;
+Could not find or construct a suitable upstream commit.
+Rerun adding --diagnose after convert-from-dgit-view, or pass a
+upstream commmit explicitly or provide suitable origs.
+END
+ }
+
+ printf STDERR "Yes, will base new branch on %s\n", $result->{Source};
+
+ ffq_check $result->{Result};
+ snags_maybe_bail();
+ update_head_checkout $head, $result->{Result},
+ 'convert-from-dgit-view';
+}
+
+sub cmd_downstream_rebase_launder_v0 () {
+ badusage "needs 1 argument, the baseline" unless @ARGV==1;
+ my ($base) = @ARGV;
+ $base = git_rev_parse $base;
+ my $old_head = get_head();
+ my $current = $old_head;
+ my $topmost_keep;
+ for (;;) {
+ if ($current eq $base) {
+ $topmost_keep //= $current;
+ print " $current BASE stop\n";
+ last;
+ }
+ my $cl = classify $current;
+ print " $current $cl->{Type}";
+ my $keep = 0;
+ my $p0 = $cl->{Parents}[0]{CommitId};
+ my $next;
+ if ($cl->{Type} eq 'Pseudomerge') {
+ print " ^".($cl->{Contributor}{Ix}+1);
+ $next = $cl->{Contributor}{CommitId};
+ } elsif ($cl->{Type} eq 'AddPatches' or
+ $cl->{Type} eq 'Changelog') {
+ print " strip";
+ $next = $p0;
+ } else {
+ print " keep";
+ $next = $p0;
+ $keep = 1;
+ }
+ print "\n";
+ if ($keep) {
+ $topmost_keep //= $current;
+ } else {
+ die "to-be stripped changes not on top of the branch\n"
+ if $topmost_keep;
+ }
+ $current = $next;
+ }
+ if ($topmost_keep eq $old_head) {
+ print "unchanged\n";
+ } else {
+ print "updating to $topmost_keep\n";
+ update_head_checkout
+ $old_head, $topmost_keep,
+ 'downstream-rebase-launder-v0';
+ }
+}
+
+getoptions_main
+ ("bad options\n",
+ "D+" => \$debuglevel,
+ 'noop-ok', => \$opt_noop_ok,
+ 'f=s' => \@snag_force_opts,
+ 'anchor=s' => \@opt_anchors,
+ '--dgit=s' => \($dgit[0]),
+ 'force!',
+ '-i:s' => sub {
+ my ($opt,$val) = @_;
+ badusage "git-debrebase: no cuddling to -i for git-rebase"
+ if length $val;
+ die if $opt_defaultcmd_interactive; # should not happen
+ $opt_defaultcmd_interactive = [ qw(-i) ];
+ # This access to @ARGV is excessive familiarity with
+ # Getopt::Long, but there isn't another sensible
+ # approach. '-i=s{0,}' does not work with bundling.
+ push @$opt_defaultcmd_interactive, @ARGV;
+ @ARGV=();
+ },
+ 'help' => sub { print $usage_message or die $!; finish 0; },
+ );
+
+initdebug('git-debrebase ');
+enabledebug if $debuglevel;
+
+my $toplevel = cmdoutput @git, qw(rev-parse --show-toplevel);
chdir $toplevel or die "chdir $toplevel: $!";
-my $cmd = shift @ARGV;
-my $cmdfn = $cmd;
-$cmdfn =~ y/-/_/;
-$cmdfn = ${*::}{"cmd_$cmdfn"};
+$rd = fresh_playground "$playprefix/misc";
+
+@opt_anchors = map { git_rev_parse $_ } @opt_anchors;
+
+if (!@ARGV || $opt_defaultcmd_interactive || $ARGV[0] =~ m{^-}) {
+ defaultcmd_rebase();
+} else {
+ my $cmd = shift @ARGV;
+ my $cmdfn = $cmd;
+ $cmdfn =~ y/-/_/;
+ $cmdfn = ${*::}{"cmd_$cmdfn"};
+
+ $cmdfn or badusage "unknown git-debrebase sub-operation $cmd";
+ $cmdfn->();
+}
-$cmdfn or badusage "unknown git-debrebase sub-operation $cmd";
-$cmdfn->();
+finish 0;