X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=git-debrebase;h=50f5e1674c6574afa7d42c8e7d04a33c31b99867;hb=528ff0071b6e9d1db499b48897a4a13f581f254f;hp=db132e3f8f041f9054e572d68f5b9aed53920fda;hpb=26d8ef1f24bb805667e032f54c224050154bd55d;p=dgit.git
diff --git a/git-debrebase b/git-debrebase
index db132e3f..50f5e167 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -3,7 +3,7 @@
# 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
@@ -18,93 +18,63 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
-# git-debrebase new-upstreams-v0 \
-# NEW-VERSION ORIG-COMMITISH
-# [EXTRA-ORIG-NAME EXTRA-ORIG-COMMITISH ...]
# usages:
-# git-debrebase status
-# git-debrebase start # like ffqrebase start + debrebase launder
-# git-debrebase new-upstream [stuff] # see below
-# git-debrebase # does debrebase start if necessary
#
-# git-debrebase analyse
-# git-debrebase launder # prints breakwater tip
-# git-debrebase create-new-upstream-breakwater [-f] ...
+# git-debrebase [] new-upstream-v0 \
+# \
+# [ ...] \
+# [...]
#
-# is
-# [,][:][+][,...]
+# git-debrebase [ --] []
+# git-debrebase [] analyse
+# git-debrebase [] launder # prints breakwater tip etc.
+# git-debrebase [] downstream-rebase-launder-v0 # experimental
#
-# if initial comma is supplied, entries are not positional. Unspecified
-# means root (and there may be only one).
-# xxx want auto branch names
-# xxx too complicated
-# how about for now
-# [+] [ [+]...]
-# ? plus options
-# --new-upstream-different-subtrees
+# git-debrebase [] gbp2debrebase-v0 \
+#
+
+# problems / outstanding questions:
+#
+# * dgit push with a `3.0 (quilt)' package means doing quilt
+# fixup. Usually this involves recommitting the whole patch
+# series, one at a time, with dpkg-source --commit. This is
+# terribly terribly slow. (Maybe this should be fixed in dgit.)
+#
+# * dgit push usually needs to (re)make a pseudomerge. The "first"
+# git-debrebase stripped out the previous pseudomerge and could
+# have remembeed the HEAD. But it's not quite clear what history
+# ought to be preserved and what should be discarded. For now
+# the user will have to tell dgit --overwrite.
+#
+# To fix this, do we need a new push hook for dgit ?
+#
+# * Workflow is currently clumsy. Lots of spurious runes to type.
+# There's not even a guide.
+#
+# * There are no tests.
+#
+# * new-upstream-v0 has a terrible UI. You end up with giant
+# runic command lines.
#
-# 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=[/])
-# branch set adjustments
-# git-debrebase new-upstream --add /
-# git-debrebase new-upstream --rm /
-# git-debrebase new-upstream / [/ ...]
-# - 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 / [] [/ [] ...]
-# - 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 \
-# [/]=
-
-# UPSTREAM[,[[SUBDIR:]SUBUPSTREAM]
-# default for SUBDIR: is from previous upstream merge[xxx terminology]
-#
+# One consequence of the lack of richness it can need --force in
+# fairly sensible situations and there is no way to tell it what
+# you are really trying to do, other than just --force. There
+# should be an interface with some default branch names.
#
-#xxx
-# when starting must record original start (for ff)
-# and new rebase basis
+# * There should be a standard convention for the version number,
+# and unfinalised or not changelog, after new-upstream.
#
-# 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-ffqrebase finish
-# git-ffqrebase status [BRANCH]
+# * Handing of multi-orig dgit new-upstream .dsc imports is known to
+# be broken. They may be not recognised, improperly converted, or
+# their conversion may be unrecognised.
#
-# 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
+# * Docs need writing and updating. Even README.git-debrebase
+# describes a design but may not reflect the implementation.
#
-# git-debrebase without start, if already started, is willing
-# to strip pseudomerges provided that they overwrite exactly
-# the previous HEAD
-# xxxx is this right ? what matters is have we pushed
-# I think in fact the right answer is:
-# git-debrebase always strips out pseudomerges from its branch
-# a pseudomerge is put in at the time we want to push
-# at that time, we make a pseudomerge of the remote tracking
-# branch (if raw git) or the dgit view (if dgit)
-# for raw git git-ffqrebase, do want preciseley to record
-# value of remote tracking branch or our branch, on start, so we
-# overwrite only things we intend to
-# the previous pseudomerge check for tags and remote branches ?
+# * We need to develop a plausible model that works for derivatives,
+# who probably want to maintain their stack on top of Debian's.
+# downstream-rebase-launder-v0 may be a starting point?
use strict;
@@ -146,7 +116,7 @@ sub dd ($) {
sub get_commit ($) {
my ($objid) = @_;
- my $data = git_cat_file $objid, 'commit';
+ my $data = (git_cat_file $objid, 'commit');
$data =~ m/(?<=\n)\n/ or die "$objid ($data) ?";
return ($`,$');
}
@@ -230,8 +200,8 @@ sub get_differs ($$) {
if ($mode eq 'A' && !m/\.series$/s) {
$ok = 1;
} elsif ($mode eq 'M' && $_ eq 'series') {
- my $x_s = git_cat_file "$x:debian/patches/series", 'blob';
- my $y_s = git_cat_file "$y:debian/patches/series", 'blob';
+ my $x_s = (git_cat_file "$x:debian/patches/series", 'blob');
+ my $y_s = (git_cat_file "$y:debian/patches/series", 'blob');
chomp $x_s; $x_s .= "\n";
$ok = $x_s eq substr($y_s, 0, length $x_s);
} else {
@@ -282,6 +252,26 @@ sub make_commit ($$) {
return cmdoutput @cmd;
}
+our $fproblems;
+sub fproblem ($) {
+ my ($msg) = @_;
+ $fproblems++;
+ print STDERR "git-debrebase: safety catch tripped: $msg\n";
+}
+sub fproblems_maybe_bail () {
+ if ($fproblems) {
+ if ($opt_force) {
+ printf STDERR
+ "safety catch trips (%d) overriden by --force\n",
+ $fproblems;
+ } else {
+ fail sprintf
+ "safety catch trips (%d) (you could --force)",
+ $fproblems;
+ }
+ }
+}
+
# classify returns an info hash like this
# CommitId => $objid
# Hdr => # commit headers, including 1 final newline
@@ -785,18 +775,33 @@ sub update_head_checkout ($$$) {
update_head $old, $new, $mrest;
}
+sub update_head_postlaunder ($$$) {
+ 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 cmd_launder () {
badusage "no arguments to launder allowed" if @ARGV;
my $old = get_head();
my ($tip,$breakwater,$last_upstream_merge) = walk $old;
- update_head $old, $tip, 'launder';
- # no tree changes except debian/patches
- runcmd @git, qw(rm --quiet --ignore-unmatch -rf debian/patches);
+ update_head_postlaunder $old, $tip, 'launder';
printf "# breakwater tip\n%s\n", $breakwater;
printf "# working tip\n%s\n", $tip;
printf "# last upstream merge\n%s\n", $last_upstream_merge;
}
+sub defaultcmd_rebase () {
+ my $old = get_head();
+ my ($tip,$breakwater) = walk $old;
+ update_head_postlaunder $old, $tip, 'launder for rebase';
+ @ARGV = qw(-i) unless @ARGV; # make configurable
+ runcmd @git, qw(rebase), @ARGV, $breakwater;
+}
+
sub cmd_analyse () {
die if ($ARGV[0]//'') =~ m/^-/;
badusage "too many arguments to analyse" if @ARGV>1;
@@ -811,16 +816,14 @@ sub cmd_analyse () {
}
sub cmd_new_upstream_v0 () {
- # xxx would like to support more git-rebase options
- badusage
- "need NEW-VERSION UPS-COMMITISH [EXTRA-UPS-NAME EXTRA-UPS-COMMITISH...]"
- unless @ARGV % 2 == 0 and @ARGV >= 2;
# tree should be clean and this is not checked
# 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 >= 2;
+
# parse args - low commitment
my $new_version = (new Dpkg::Version scalar(shift @ARGV), check => 1);
my $new_upstream_version = $new_version->version();
@@ -848,8 +851,12 @@ sub cmd_new_upstream_v0 () {
OldIx => 0,
New => $new_upstream,
);
- while (@ARGV) {
+ 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);
@@ -866,18 +873,11 @@ sub cmd_new_upstream_v0 () {
my $old_upstream = parsecommit
$old_upstream_update_cl->{OrigParents}[0]{CommitId};
- my $problems = 0;
- my $problem = sub {
- my ($msg) = @_;
- $problems++;
- print STDERR "preflight check failed: $msg\n";
- };
-
$piece->('', Old => $old_upstream->{CommitId});
if ($old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
if ($old_upstream->{Msg} =~
- m{^\[git-debrebase new-upstream combine \.((?: $extra_orig_namepart_re)+)\]}
+ m{^\[git-debrebase (?:\w*-)?upstream combine \.((?: $extra_orig_namepart_re)+)\]}
) {
my @oldpieces = ('', split / /, $1);
my $parentix = -1 + scalar @{ $old_upstream->{Parents} };
@@ -886,35 +886,25 @@ sub cmd_new_upstream_v0 () {
$piece->($n, Old => $old_upstream->{CommitId}.'^'.$parentix);
}
} else {
- $problem->("previous upstream $old_upstream->{CommitId} is from".
- " git-debrebase but not a \`new-upstream combine' commit");
+ fproblem "previous upstream $old_upstream->{CommitId} is from".
+ " git-debrebase but not an \`upstream combine' commit";
}
}
foreach my $pc (values %pieces) {
if (!$pc->{Old}) {
- $problem->("introducing upstream piece \`$pc->{Name}'");
+ fproblem "introducing upstream piece \`$pc->{Name}'";
} elsif (!$pc->{New}) {
- $problem->("dropping upstream piece \`$pc->{Name}'");
+ fproblem "dropping upstream piece \`$pc->{Name}'";
} elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
- $problem->("not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}");
+ fproblem "not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}";
}
}
printdebug "%pieces = ", (dd \%pieces), "\n";
printdebug "\@newpieces = ", (dd \@newpieces), "\n";
- if ($problems) {
- if ($opt_force) {
- printf STDERR
- "preflight check failures (%d) overriden by --force\n",
- $problems;
- } else {
- fail sprintf
- "preflight check failures (%d) (you could --force)",
- $problems;
- }
- }
+ fproblems_maybe_bail();
my $new_bw;
@@ -922,7 +912,7 @@ sub cmd_new_upstream_v0 () {
in_workarea sub {
my @upstream_merge_parents;
- if (!$problems) {
+ if (!$fproblems) {
push @upstream_merge_parents, $old_upstream->{CommitId};
}
@@ -961,10 +951,10 @@ sub cmd_new_upstream_v0 () {
# Now we have to add a changelog stanza so the Debian version
# is right.
-
die if unlink "debian";
- die $! unless $!==ENOTEMPTY;
- unlink "debian/changelog" or die $!;
+ 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
@@ -992,13 +982,53 @@ END
# 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 $old_head, $old_laundered_tip, 'launder for new upstream';
+ update_head_postlaunder $old_head, $old_laundered_tip,
+ 'launder for new upstream';
- my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw);
+ my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw, @ARGV);
runcmd @cmd;
# now it's for the user to sort out
}
+sub cmd_gbp2debrebase () {
+ badusage "needs 1 optional argument, the upstream" unless @ARGV<=1;
+ my ($upstream_spec) = @ARGV;
+ $upstream_spec //= 'refs/heads/upstream';
+ my $upstream = git_rev_parse $upstream_spec;
+ my $old_head = get_head();
+
+ my $upsdiff = get_differs $upstream, $old_head;
+ if ($upsdiff & D_UPS) {
+ runcmd @git, qw(--no-pager diff),
+ $upstream, $old_head,
+ qw( -- :!/debian :/);
+ fail "upstream ($upstream_spec) and HEAD are not identical in upstream files";
+ }
+
+ if (!is_fast_fwd $upstream, $old_head) {
+ fproblem "upstream ($upstream) is not an ancestor of HEAD";
+ } else {
+ my $wrong = cmdoutput
+ (@git, qw(rev-list --ancestry-path), "$upstream..HEAD",
+ qw(-- :/ :!/debian));
+ if (length $wrong) {
+ fproblem "history between upstream ($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') {
+ fproblem "upstream ($upstream) contains debian/ directory";
+ }
+ die;
+
+ fresh_workarea();
+ in_workarea sub {
+ runcmd @git, qw(checkout -b work), $old_head;
+
+ };
+}
+
sub cmd_downstream_rebase_launder_v0 () {
badusage "needs 1 argument, the baseline" unless @ARGV==1;
my ($base) = @ARGV;
@@ -1058,10 +1088,14 @@ chdir $toplevel or die "chdir $toplevel: $!";
$rd = fresh_playground "$playprefix/misc";
-my $cmd = shift @ARGV;
-my $cmdfn = $cmd;
-$cmdfn =~ y/-/_/;
-$cmdfn = ${*::}{"cmd_$cmdfn"};
+if (!@ARGV || $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->();
+}