3 # Script helping make fast-forwarding histories while still rebasing
4 # upstream deltas when working on Debian packaging
6 # Copyright (C)2017,2018 Ian Jackson
8 # This program is free software: you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation, either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 END { $? = $Debian::Dgit::ExitStatus::desired // -1; };
22 use Debian::Dgit::GDR;
23 use Debian::Dgit::ExitStatus;
27 use Debian::Dgit qw(:DEFAULT :playground);
34 use Getopt::Long qw(:config posix_default gnu_compat bundling);
36 use File::FnMatch qw(:fnmatch);
39 $debugcmd_when_debuglevel = 2;
41 our ($usage_message) = <<'END';
43 git-debrebase [<options>] [--|-i <git rebase options...>]
44 git-debrebase [<options>] status
45 git-debrebase [<options>] prepush [--prose=...]
46 git-debrebase [<options>] quick|conclude
47 git-debrebase [<options>] new-upstream <new-version> [<details ...>]
48 git-debrebase [<options>] convert-from-gbp [<upstream-commitish>]
50 See git-debrebase(1), git-debrebase(5), dgit-maint-debrebase(7) (in dgit).
53 our ($opt_force, $opt_noop_ok, @opt_anchors);
54 our ($opt_defaultcmd_interactive);
56 our $us = qw(git-debrebase);
62 print STDERR "$us: bad usage: $m\n";
68 local $SIG{__WARN__}; # GetOptions calls `warn' to print messages
69 GetOptions @_ or badusage $m;
73 getoptions_main "bad options follow \`git-debrebase $sc'", @_;
77 my ($k, $optional) = @_;
79 my @cmd = qw(git config -z);
80 push @cmd, qw(--get-all) if wantarray;
82 my $out = cmdoutput_errok @cmd;
84 fail "missing required git config $k" unless $optional;
87 my @l = split /\0/, $out;
88 return wantarray ? @l : $l[0];
95 my $dd = new Data::Dumper [ $v ];
96 Terse $dd 1; Indent $dd 0; Useqq $dd 1;
102 my $data = (git_cat_file $objid, 'commit');
103 $data =~ m/(?<=\n)\n/ or die "$objid ($data) ?";
107 sub D_UPS () { 0x02; } # upstream files
108 sub D_PAT_ADD () { 0x04; } # debian/patches/ extra patches at end
109 sub D_PAT_OTH () { 0x08; } # debian/patches other changes
110 sub D_DEB_CLOG () { 0x10; } # debian/ (not patches/ or changelog)
111 sub D_DEB_OTH () { 0x20; } # debian/changelog
112 sub DS_DEB () { D_DEB_CLOG | D_DEB_OTH; } # debian/ (not patches/)
114 our $playprefix = 'debrebase';
119 our @dgit = qw(dgit);
121 sub in_workarea ($) {
124 my $r = eval { $sub->(); };
125 { local $@; changedir $maindir; }
129 sub fresh_workarea () {
130 $workarea = fresh_playground "$playprefix/work";
131 in_workarea sub { playtree_setup };
134 our $snags_forced = 0;
135 our $snags_tripped = 0;
136 our $snags_summarised = 0;
137 our @deferred_updates;
138 our @deferred_update_messages;
140 sub all_snags_summarised () {
141 $snags_forced + $snags_tripped == $snags_summarised;
143 sub run_deferred_updates ($) {
146 confess 'dangerous internal error' unless all_snags_summarised();
148 my @upd_cmd = (git_update_ref_cmd "debrebase: $mrest", qw(--stdin));
149 debugcmd '>|', @upd_cmd;
150 open U, "|-", @upd_cmd or die $!;
151 foreach (@deferred_updates) {
152 printdebug ">= ", $_, "\n";
153 print U $_, "\n" or die $!;
156 close U or failedcmd @upd_cmd;
158 print $_, "\n" foreach @deferred_update_messages;
160 @deferred_updates = ();
161 @deferred_update_messages = ();
164 sub get_differs ($$) {
166 # This resembles quiltify_trees_differ, in dgit, a bit.
167 # But we don't care about modes, or dpkg-source-unrepresentable
168 # changes, and we don't need the plethora of different modes.
169 # Conversely we need to distinguish different kinds of changes to
170 # debian/ and debian/patches/.
175 my ($opts, $limits, $fn) = @_;
176 my @cmd = (@git, qw(diff-tree -z --no-renames));
178 push @cmd, "$_:" foreach $x, $y;
179 push @cmd, '--', @$limits;
180 my $diffs = cmdoutput @cmd;
181 foreach (split /\0/, $diffs) { $fn->(); }
184 $rundiff->([qw(--name-only)], [], sub {
185 $differs |= $_ eq 'debian' ? DS_DEB : D_UPS;
188 if ($differs & DS_DEB) {
190 $rundiff->([qw(--name-only -r)], [qw(debian)], sub {
192 m{^debian/patches/} ? D_PAT_OTH :
193 $_ eq 'debian/changelog' ? D_DEB_CLOG :
196 die "mysterious debian changes $x..$y"
197 unless $differs & (D_PAT_OTH|DS_DEB);
200 if ($differs & D_PAT_OTH) {
202 $differs &= ~D_PAT_OTH;
204 $differs |= D_PAT_OTH;
205 no warnings qw(exiting); last;
207 $rundiff->([qw(--name-status -r)], [qw(debian/patches/)], sub {
208 no warnings qw(exiting);
209 if (!defined $mode) {
212 die unless s{^debian/patches/}{};
214 if ($mode eq 'A' && !m/\.series$/s) {
216 } elsif ($mode eq 'M' && $_ eq 'series') {
217 my $x_s = (git_cat_file "$x:debian/patches/series", 'blob');
218 my $y_s = (git_cat_file "$y:debian/patches/series", 'blob');
219 chomp $x_s; $x_s .= "\n";
220 $ok = $x_s eq substr($y_s, 0, length $x_s);
225 $differs |= $ok ? D_PAT_ADD : D_PAT_OTH;
227 die "mysterious debian/patches changes $x..$y"
228 unless $differs & (D_PAT_ADD|D_PAT_OTH);
231 printdebug sprintf "get_differs %s %s = %#x\n", $x, $y, $differs;
236 sub commit_pr_info ($) {
238 return Data::Dumper->dump([$r], [qw(commit)]);
241 sub calculate_committer_authline () {
242 my $c = cmdoutput @git, qw(commit-tree --no-gpg-sign -m),
243 'DUMMY COMMIT (git-debrebase)', "HEAD:";
244 my ($h,$m) = get_commit $c;
245 $h =~ m/^committer .*$/m or confess "($h) ?";
249 sub rm_subdir_cached ($) {
251 runcmd @git, qw(rm --quiet -rf --cached --ignore-unmatch), $subdir;
254 sub read_tree_subdir ($$) {
255 my ($subdir, $new_tree_object) = @_;
256 rm_subdir_cached $subdir;
257 runcmd @git, qw(read-tree), "--prefix=$subdir/", $new_tree_object;
260 sub read_tree_debian ($) {
262 read_tree_subdir 'debian', "$treeish:debian";
263 rm_subdir_cached 'debian/patches';
266 sub read_tree_upstream ($;$) {
267 my ($treeish, $keep_patches) = @_;
268 my $save = cmdoutput @git, qw(write-tree --prefix=debian/);
269 runcmd @git, qw(read-tree), $treeish;
270 read_tree_subdir 'debian', $save;
271 rm_subdir_cached 'debian/patches' unless $keep_patches;
274 sub make_commit ($$) {
275 my ($parents, $message_paras) = @_;
276 my $tree = cmdoutput @git, qw(write-tree);
277 my @cmd = (@git, qw(commit-tree), $tree);
278 push @cmd, qw(-p), $_ foreach @$parents;
279 push @cmd, qw(-m), $_ foreach @$message_paras;
280 return cmdoutput @cmd;
283 our @snag_force_opts;
285 my ($tag,$msg) = @_; # ignores extra args, for benefit of keycommits
286 if (grep { $_ eq $tag } @snag_force_opts) {
288 print STDERR "git-debrebase: snag ignored (-f$tag): $msg\n";
291 print STDERR "git-debrebase: snag detected (-f$tag): $msg\n";
295 # Important: all mainline code must call snags_maybe_bail after
296 # any point where snag might be called, but before making changes
297 # (eg before any call to run_deferred_updates). snags_maybe_bail
298 # may be called more than once if necessary (but this is not ideal
299 # because then the messages about number of snags may be confusing).
300 sub snags_maybe_bail () {
301 return if all_snags_summarised();
304 "%s: snags: %d overriden by individual -f options\n",
307 if ($snags_tripped) {
310 "%s: snags: %d overriden by global --force\n",
314 "%s: snags: %d blocker(s) (you could -f<tag>, or --force)",
318 $snags_summarised = $snags_forced + $snags_tripped;
320 sub snags_maybe_bail_early () {
321 # useful to bail out early without doing a lot of work;
322 # not a substitute for snags_maybe_bail.
323 snags_maybe_bail() if $snags_tripped && !$opt_force;
326 return $snags_forced || $snags_tripped;
329 sub gbp_pq_export ($$$) {
330 my ($bname, $base, $tip) = @_;
331 # must be run in a workarea. $bname and patch-queue/$bname
332 # ought not to exist. Leaves you on patch-queue/$bname with
333 # the patches staged but not committed.
334 printdebug "gbp_pq_export $bname $base $tip\n";
335 runcmd @git, qw(checkout -q -b), $bname, $base;
336 runcmd @git, qw(checkout -q -b), "patch-queue/$bname", $tip;
337 my @gbp_cmd = (qw(gbp pq export));
338 my $r = system shell_cmd 'exec >../gbp-pq-err 2>&1', @gbp_cmd;
340 { local ($!,$?); copy('../gbp-pq-err', \*STDERR); }
343 runcmd @git, qw(add -f debian/patches);
347 # xxx allow merge resolution separately from laundering, before git merge
349 # xxx general gdr docs highlight forbidden things
350 # xxx general gdr docs list allowable things ?
351 # xxx general gdr docs explicitly forbid some rebase
353 # xxx provide a way for the user to help
354 # xxx (eg, provide wreckage provide way to continue)
357 # use git-format-patch?
358 # our own patch identification algorithm?
359 # this is an alternative strategy
361 sub merge_series ($$;@) {
362 my ($newbase, $base_q, @input_qs) = @_;
363 # $base_q{SeriesBase} $input_qs[]{SeriesBase}
364 # $base_q{SeriesTip} $input_qs[]{SeriesTip}
365 # ^ specifies several patch series (currently we only support exactly 2)
366 # return value is a commit which is the result of
367 # merging the two versions of the same topic branch
368 # $input_q[0] and $input_q[1]
369 # with respect to the old version
373 # Creates, in *_q, a key MR for its private use
375 printdebug "merge_series newbase=$newbase\n";
377 $input_qs[$_]{MR}{S} = $_ foreach (0..$#input_qs);
378 $base_q->{MR}{S} = 'base';
381 # $prereq{<patch filename>}{<possible prereq}{<S>} = 1 or absent
382 # $prereq{<patch filename>}{<possible prereq} exists or not (later)
383 # $prereq{<patch filename>} exists or not (even later)
387 local $workarea = fresh_playground "$playprefix/merge";
388 my $seriesfile = "debian/patches/series";
391 foreach my $q ($base_q, reverse @input_qs) {
393 gbp_pq_export "p-$s", $q->{SeriesBase}, $q->{SeriesTip};
394 if (open S, $seriesfile) {
396 while (my $patch = <S>) {
397 chomp $patch or die $!;
398 $prereq{$patch} //= {};
399 foreach my $earlier (@earlier) {
400 $prereq{$patch}{$earlier}{$s}++ and die;
402 push @earlier, $patch;
403 stat "debian/patches/$patch" or die "$patch ?";
405 S->error and die "$seriesfile $!";
408 die "$seriesfile $!" unless $!==ENOENT;
410 read_tree_upstream $newbase, 1;
411 my $pec = make_commit [ grep { defined } $base_q->{MR}{PEC} ], [
412 "Convert $s to patch queue for merging",
413 "[git-debrebase merge-innards patch-queue import:".
416 printdebug "merge_series pec $pec ";
417 runcmd @git, qw(rm -q --cached), $seriesfile;
418 $pec = make_commit [ $pec ], [
419 "Drop series file from $s to avoid merge trouble",
420 "[git-debrebase merge-innards patch-queue prep:".
423 printdebug "pec' $pec\n";
424 runcmd @git, qw(reset -q --hard), $pec;
425 $q->{MR}{PEC} = $pec;
427 # now, because of reverse, we are on $input_q->{MR}{OQC}
428 runcmd @git, qw(checkout -q -b merge);
429 printdebug "merge_series merging...\n";
430 my @mergecmd = (@git, qw(merge --quiet --no-edit), "p-1");
431 debugcmd '+', @mergecmd;
433 if (system @mergecmd) {
437 printdebug "merge_series merge ok, series...\n";
438 # We need to construct a new series file
439 # Firstly, resolve prereq
440 foreach my $f (sort keys %prereq) {
441 printdebug "merge_series patch\t$f\t";
442 if (!stat_exists "debian/patches/$f") {
443 print DEBUG " drop\n" if $debuglevel;
444 # git merge deleted it; that's how we tell it's not wanted
448 print DEBUG " keep\n" if $debuglevel;
449 foreach my $g (sort keys %{ $prereq{$f} }) {
450 my $gfp = $prereq{$f}{$g};
451 printdebug "merge_series prereq\t$f\t-> $g\t";
452 if (!!$gfp->{0} == !!$gfp->{1}
455 print DEBUG "\tkeep\n" if $debuglevel;
457 print DEBUG "\tdrop\n" if $debuglevel;
458 delete $prereq{$f}{$g};
465 return scalar keys %{ $prereq{$f} };
468 my $nodate = time + 1;
470 # $authordate{<patch filename>};
471 my $authordate = sub {
473 $authordate{$f} //= do {
474 open PF, "<", "debian/patches/$f" or die "$f $!";
476 return $nodate if m/^$/;
477 last if s{^Date: }{};
480 return cmdoutput qw(date +%s -d), $_;
484 open NS, '>', $seriesfile or die $!;
486 while (keys %prereq) {
488 foreach my $try (sort keys %prereq) {
491 $unsat->($try) <=> $unsat->($best) or
492 $authordate->($try) <=> $authordate->($best) or
498 printdebug "merge_series series next $best\n";
499 print NS "$best\n" or die $!;
500 delete $prereq{$best};
501 foreach my $gp (values %prereq) {
506 runcmd @git, qw(add), $seriesfile;
507 runcmd @git, qw(commit --quiet -m), 'Merged series';
509 printdebug "merge_series series gbp pq import\n";
510 runcmd qw(gbp pq import);
512 # OK now we are on patch-queue/merge, and we need to rebase
513 # onto the intended parent and drop the patches from each one
515 printdebug "merge_series series ok, building...\n";
516 my $build = $newbase;
517 my @lcmd = (@git, qw(rev-list --reverse merge..patch-queue/merge));
518 foreach my $c (grep /./, split /\n/, cmdoutput @lcmd) {
519 my $commit = git_cat_file $c, 'commit';
520 printdebug "merge_series series ok, building $c\n";
521 read_tree_upstream $c;
522 my $tree = cmdoutput @git, qw(write-tree);
523 $commit =~ s{^parent (\S+)$}{parent $build}m or confess;
524 $commit =~ s{^tree (\S+)$}{tree $tree}m or confess;
525 open C, ">", "../mcommit" or die $!;
526 print C $commit or die $!;
528 $build = cmdoutput @git, qw(hash-object -w -t commit ../mcommit);
531 runcmd @git, qw(update-ref refs/heads/result), $result;
533 printdebug "merge_series returns $result\n";
537 # classify returns an info hash like this
539 # Hdr => # commit headers, including 1 final newline
540 # Msg => # commit message (so one newline is dropped)
542 # Type => (see below)
544 # Ix => $index # ie 0, 1, 2, ...
546 # Differs => return value from get_differs
548 # IsDggitImport => 'orig' 'tarball' 'unpatched' 'package' (as from dgit)
550 # NewMsg => # commit message, but with any [dgit import ...] edited
551 # # to say "[was: ...]"
561 # has additional entres in classification result
562 # Overwritten = [ subset of Parents ]
563 # Contributor = $the_remaining_Parent
565 # DgitImportUnpatched
566 # has additional entry in classification result
567 # OrigParents = [ subset of Parents ]
570 # has additional entry in classification result
571 # OrigParents = [ subset of Parents ] # singleton list
578 # has additional entry in classification result
581 sub parsecommit ($;$) {
582 my ($objid, $p_ref) = @_;
583 # => hash with CommitId Hdr Msg Tree Parents
584 # Parents entries have only Ix CommitId
585 # $p_ref, if provided, must be [] and is used as a base for Parents
590 my ($h,$m) = get_commit $objid;
592 my ($t) = $h =~ m/^tree (\w+)$/m or die $objid;
593 my (@ph) = $h =~ m/^parent (\w+)$/mg;
603 foreach my $ph (@ph) {
605 Ix => scalar @$p_ref,
617 my $r = parsecommit($objid, \@p);
621 $p->{Differs} = (get_differs $p->{CommitId}, $t),
624 printdebug "classify $objid \$t=$t \@p",
625 (map { sprintf " %s/%#x", $_->{CommitId}, $_->{Differs} } @p),
629 my ($type, @rest) = @_;
630 $r = { %$r, Type => $type, @rest };
632 printdebug " = $type ".(dd $r)."\n";
638 $r = { %$r, Type => qw(Unknown), Why => $why };
639 printdebug " ** Unknown\n";
643 if (grep { $_ eq $objid } @opt_anchors) {
644 return $classify->('TreatAsAnchor');
647 my @identical = grep { !$_->{Differs} } @p;
648 my ($stype, $series) = git_cat_file "$t:debian/patches/series";
649 my $haspatches = $stype ne 'missing' && $series =~ m/^\s*[^#\n\t ]/m;
651 if ($r->{Msg} =~ m{^\[git-debrebase anchor.*\]$}m) {
652 # multi-orig upstreams are represented with an anchor merge
653 # from a single upstream commit which combines the orig tarballs
655 # Every anchor tagged this way must be a merge.
656 # We are relying on the
657 # [git-debrebase anchor: ...]
658 # commit message annotation in "declare" anchor merges (which
659 # do not have any upstream changes), to distinguish those
660 # anchor merges from ordinary pseudomerges (which we might
661 # just try to strip).
663 # However, the user is going to be doing git-rebase a lot. We
664 # really don't want them to rewrite an anchor commit.
665 # git-rebase trips up on merges, so that is a useful safety
668 # BreakwaterStart commits are also anchors in the terminology
669 # of git-debrebase(5), but they are untagged (and always
670 # manually generated).
672 # We cannot not tolerate any tagged linear commit (ie,
673 # BreakwaterStart commits tagged `[anchor:') because such a
674 # thing could result from an erroneous linearising raw git
675 # rebase of a merge anchor. That would represent a corruption
676 # of the branch. and we want to detect and reject the results
677 # of such corruption before it makes it out anywhere. If we
678 # reject it here then we avoid making the pseudomerge which
679 # would be needed to push it.
681 my $badanchor = sub { $unknown->("git-debrebase \`anchor' but @_"); };
682 @p == 2 or return $badanchor->("has other than two parents");
683 $haspatches and return $badanchor->("contains debian/patches");
685 # How to decide about l/r ordering of anchors ? git
686 # --topo-order prefers to expand 2nd parent first. There's
687 # already an easy rune to look for debian/ history anyway (git log
688 # debian/) so debian breakwater branch should be 1st parent; that
689 # way also there's also an easy rune to look for the upstream
690 # patches (--topo-order).
692 # Also this makes --first-parent be slightly more likely to
693 # be useful - it makes it provide a linearised breakwater history.
695 # Of course one can say somthing like
696 # gitk -- ':/' ':!/debian'
697 # to get _just_ the commits touching upstream files, and by
698 # the TREESAME logic in git-rev-list this will leave the
699 # breakwater into upstream at the first anchor. But that
700 # doesn't report debian/ changes at all.
702 # Other observations about gitk: by default, gitk seems to
703 # produce output in a different order to git-rev-list. I
704 # can't seem to find this documented anywhere. gitk
705 # --date-order DTRT. But, gitk always seems to put the
706 # parents from left to right, in order, so it's easy to see
707 # which way round a pseudomerge is.
709 $p[0]{IsOrigin} and $badanchor->("is an origin commit");
710 $p[1]{Differs} & ~DS_DEB and
711 $badanchor->("upstream files differ from left parent");
712 $p[0]{Differs} & ~D_UPS and
713 $badanchor->("debian/ differs from right parent");
715 return $classify->(qw(Anchor),
716 OrigParents => [ $p[1] ]);
720 my $d = $r->{Parents}[0]{Differs};
721 if ($d == D_PAT_ADD) {
722 return $classify->(qw(AddPatches));
723 } elsif ($d & (D_PAT_ADD|D_PAT_OTH)) {
724 return $unknown->("edits debian/patches");
725 } elsif ($d & DS_DEB and !($d & ~DS_DEB)) {
726 my ($ty,$dummy) = git_cat_file "$p[0]{CommitId}:debian";
728 if ($d == D_DEB_CLOG) {
729 return $classify->(qw(Changelog));
731 return $classify->(qw(Packaging));
733 } elsif ($ty eq 'missing') {
734 return $classify->(qw(BreakwaterStart));
736 return $unknown->("parent's debian is not a directory");
738 } elsif ($d == D_UPS) {
739 return $classify->(qw(Upstream));
740 } elsif ($d & DS_DEB and $d & D_UPS and !($d & ~(DS_DEB|D_UPS))) {
741 return $classify->(qw(Mixed));
743 return $unknown->("no changes");
745 confess "internal error $objid ?";
749 return $unknown->("origin commit");
752 if (@p == 2 && @identical == 1) {
753 my @overwritten = grep { $_->{Differs} } @p;
754 confess "internal error $objid ?" unless @overwritten==1;
755 return $classify->(qw(Pseudomerge),
756 Overwritten => [ $overwritten[0] ],
757 Contributor => $identical[0]);
759 if (@p == 2 && @identical == 2) {
761 my ($ph,$pm) = get_commit $_[0]{CommitId};
762 $ph =~ m/^committer .* (\d+) [-+]\d+$/m or die "$_->{CommitId} ?";
766 my $order = $get_t->($bytime[0]) <=> $get_t->($bytime[1]);
767 if ($order > 0) { # newer first
768 } elsif ($order < 0) {
769 @bytime = reverse @bytime;
771 # same age, default to order made by -s ours
772 # that is, commit was made by someone who preferred L
774 return $classify->(qw(Pseudomerge),
775 SubType => qw(Ambiguous),
776 Contributor => $bytime[0],
777 Overwritten => [ $bytime[1] ]);
780 my ($p_h, $p_m) = get_commit $p->{CommitId};
781 $p->{IsOrigin} = $p_h !~ m/^parent \w+$/m;
782 ($p->{IsDgitImport},) = $p_m =~ m/^\[dgit import ([0-9a-z]+) .*\]$/m;
784 my @orig_ps = grep { ($_->{IsDgitImport}//'X') eq 'orig' } @p;
786 if (!(grep { !$_->{IsOrigin} } @p) and
787 (@orig_ps >= @p - 1) and
788 $m2 =~ s{^\[(dgit import unpatched .*)\]$}{[was: $1]}m) {
790 return $classify->(qw(DgitImportUnpatched),
791 OrigParents => \@orig_ps);
795 $r->{Msg} =~ m{^\[git-debrebase merged-breakwater.*\]$}m) {
796 # xxx ^ metadata tag needs adding to (5)
797 return $classify->("MergedBreakwaters");
799 if ($r->{Msg} =~ m{^\[(git-debrebase|dgit)[: ].*\]$}m) {
800 return $unknown->("unknown kind of merge from $1");
803 return $unknown->("octopus merge");
806 if (!$ENV{GIT_DEBREBASE_EXPERIMENTAL_MERGE}) {
807 return $unknown->("general two-parent merge");
810 return $classify->("VanillaMerge");
813 sub keycommits ($;$$$$$);
815 sub mergedbreakwaters_anchor ($) {
818 foreach my $p (@{ $cl->{Parents} }) {
819 my ($panchor, $pbw) = keycommits $p->{CommitId},
820 undef,undef,undef,undef, 1;
821 $best_anchor = $panchor
822 if !defined $best_anchor
823 or is_fast_fwd $best_anchor, $panchor;
828 sub keycommits ($;$$$$$) {
829 my ($head, $furniture, $unclean, $trouble, $fatal, $claimed_bw) = @_;
830 # => ($anchor, $breakwater)
832 # $unclean->("unclean-$tagsfx", $msg, $cl)
833 # $furniture->("unclean-$tagsfx", $msg, $cl)
834 # $dgitimport->("unclean-$tagsfx", $msg, $cl))
835 # is callled for each situation or commit that
836 # wouldn't be found in a laundered branch
837 # $furniture is for furniture commits such as might be found on an
838 # interchange branch (pseudomerge, d/patches, changelog)
839 # $trouble is for things whnich prevent the return of
840 # anchor and breakwater information; if that is ignored,
841 # then keycommits returns (undef, undef) instead.
842 # $fatal is for unprocessable commits, and should normally cause
843 # a failure. If ignored, agaion, (undef, undef) is returned.
845 # If $claimed_bw, this is supposed to be a breakwater commit.
847 # If a callback is undef, fail is called instead.
848 # If a callback is defined but false, the situation is ignored.
850 # no warnings qw(exiting); last;
851 # if the answer is no longer wanted.
853 my ($anchor, $breakwater);
854 $breakwater = $head if $claimed_bw;
858 $fatal //= sub { fail $_[1]; };
860 my ($cb, $tagsfx, $mainwhy, $xwhy) = @_;
861 my $why = $mainwhy.$xwhy;
862 my $m = "branch needs laundering (run git-debrebase): $why";
863 fail $m unless defined $cb;
865 $cb->("unclean-$tagsfx", $why, $cl, $mainwhy);
867 my $found_anchor = sub {
869 $breakwater //= $clogonly;
870 $breakwater //= $head;
871 no warnings qw(exiting);
875 $cl = classify $head;
876 my $ty = $cl->{Type};
877 if ($ty eq 'Packaging') {
878 $breakwater //= $clogonly;
879 $breakwater //= $head;
880 } elsif ($ty eq 'Changelog') {
881 # this is going to count as the tip of the breakwater
882 # only if it has no upstream stuff before it
884 } elsif ($ty eq 'Anchor' or
885 $ty eq 'TreatAsAnchor' or
886 $ty eq 'BreakwaterStart') {
887 $found_anchor->($head);
888 } elsif ($ty eq 'Upstream') {
889 $x->($unclean, 'ordering',
890 "packaging change ($breakwater) follows upstream change"," (eg $head)")
891 if defined $breakwater;
894 } elsif ($ty eq 'Mixed') {
895 $x->($unclean, 'mixed',
896 "found mixed upstream/packaging commit"," ($head)");
899 } elsif ($ty eq 'Pseudomerge' or
900 $ty eq 'AddPatches') {
902 $x->($furniture, (lc $ty),
903 "found interchange bureaucracy commit ($ty)"," ($head)");
904 } elsif ($ty eq 'DgitImportUnpatched') {
906 $x->($trouble, 'dgitimport',
907 "found dgit dsc import"," ($head)");
908 return (undef,undef);
910 $x->($fatal, 'unprocessable',
911 "found bare dgit dsc import with no prior history",
913 return (undef,undef);
915 } elsif ($ty eq 'VanillaMerge') {
916 $x->($trouble, 'vanillamerge',
917 "found vanilla merge"," ($head)");
918 return (undef,undef);
919 } elsif ($ty eq 'MergedBreakwaters') {
920 $found_anchor->(mergedbreakwaters_anchor $cl);
922 $x->($fatal, 'unprocessable',
923 "found unprocessable commit, cannot cope: $cl->{Why}",
925 return (undef,undef);
927 $head = $cl->{Parents}[0]{CommitId};
929 return ($anchor, $breakwater);
935 $nogenerate,$report, $report_lprefix) = @_;
936 # => ($tip, $breakwater_tip, $last_anchor)
937 # (or nothing, if $nogenerate)
939 printdebug "*** WALK $input ".($nogenerate//0)." ".($report//'-')."\n";
940 $report_lprefix //= '';
942 # go through commits backwards
943 # we generate two lists of commits to apply:
944 # breakwater branch and upstream patches
945 my (@brw_cl, @upp_cl, @processed);
952 my ($prose, $info) = @_;
956 $ms .= "\n\n[git-debrebase$info: $prose]\n";
959 my $rewrite_from_here = sub {
961 my $sp_cl = { SpecialMethod => 'StartRewrite' };
963 push @processed, $sp_cl;
968 my $prprdelim = sub { print $report $prdelim if $report; $prdelim=""; };
971 return unless $report;
972 print $report $prdelim, $report_lprefix, @_;
976 my $bomb = sub { # usage: return $bomb->();
977 print $report " Unprocessable" if $report;
978 print $report " ($cl->{Why})" if $report && defined $cl->{Why};
981 return (undef,undef);
983 fail "found unprocessable commit, cannot cope".
984 (defined $cl->{Why} ? "; $cl->{Why}:": ':').
985 " (commit $cur) (d.".
986 (join ' ', map { sprintf "%#x", $_->{Differs} }
987 @{ $cl->{Parents} }).
994 my $build_start = sub {
995 my ($msg, $parent) = @_;
998 no warnings qw(exiting); last;
1002 fail "something useful about failed merge attempt @_ xxx".Dumper($cl);
1008 $cl = classify $cur;
1009 my $ty = $cl->{Type};
1010 my $st = $cl->{SubType};
1011 $prline->("$cl->{CommitId} $cl->{Type}");
1012 $found{$ty. ( defined($st) ? "-$st" : '' )}++;
1013 push @processed, $cl;
1014 my $p0 = @{ $cl->{Parents} }==1 ? $cl->{Parents}[0]{CommitId} : undef;
1015 if ($ty eq 'AddPatches') {
1017 $rewrite_from_here->(\@upp_cl);
1019 } elsif ($ty eq 'Packaging' or $ty eq 'Changelog') {
1023 } elsif ($ty eq 'BreakwaterStart') {
1024 $last_anchor = $cur;
1025 $build_start->('FirstPackaging', $cur);
1026 } elsif ($ty eq 'Upstream') {
1030 } elsif ($ty eq 'Mixed') {
1033 my $cls = { %$cl, $xmsg->("split mixed commit: $wh part") };
1036 $queue->(\@brw_cl, "debian");
1037 $queue->(\@upp_cl, "upstream");
1038 $rewrite_from_here->(\@brw_cl);
1041 } elsif ($ty eq 'Pseudomerge') {
1042 my $contrib = $cl->{Contributor}{CommitId};
1043 print $report " Contributor=$contrib" if $report;
1044 push @pseudomerges, $cl;
1045 $rewrite_from_here->(\@upp_cl);
1048 } elsif ($ty eq 'Anchor' or $ty eq 'TreatAsAnchor') {
1049 $last_anchor = $cur;
1050 $build_start->("Anchor", $cur);
1051 } elsif ($ty eq 'DgitImportUnpatched') {
1052 my $pm = $pseudomerges[-1];
1054 # To an extent, this is heuristic. Imports don't have
1055 # a useful history of the debian/ branch. We assume
1056 # that the first pseudomerge after an import has a
1057 # useful history of debian/, and ignore the histories
1058 # from later pseudomerges. Often the first pseudomerge
1059 # will be the dgit import of the upload to the actual
1060 # suite intended by the non-dgit NMUer, and later
1061 # pseudomerges may represent in-archive copies.
1062 my $ovwrs = $pm->{Overwritten};
1063 printf $report " PM=%s \@Overwr:%d",
1064 $pm->{CommitId}, (scalar @$ovwrs)
1067 printdebug "*** WALK BOMB DgitImportUnpatched\n";
1070 my $ovwr = $ovwrs->[0]{CommitId};
1071 printf $report " Overwr=%s", $ovwr if $report;
1072 # This import has a tree which is just like a
1073 # breakwater tree, but it has the wrong history. It
1074 # ought to have the previous breakwater (which the
1075 # pseudomerge overwrote) as an ancestor. That will
1076 # make the history of the debian/ files correct. As
1077 # for the upstream version: either it's the same as
1078 # was ovewritten (ie, same as the previous
1079 # breakwater), in which case that history is precisely
1080 # right; or, otherwise, it was a non-gitish upload of a
1081 # new upstream version. We can tell these apart by
1082 # looking at the tree of the supposed upstream.
1085 SpecialMethod => 'DgitImportDebianUpdate',
1086 $xmsg->("convert dgit import: debian changes")
1089 SpecialMethod => 'DgitImportUpstreamUpdate',
1090 $xmsg->("convert dgit import: upstream update",
1093 $prline->(" Import");
1094 $rewrite_from_here->(\@brw_cl);
1095 $upp_limit //= $#upp_cl; # further, deeper, patches discarded
1099 # Everything is from this import. This kind of import
1100 # is already nearly in valid breakwater format, with the
1101 # patches as commits. Unfortunately it contains
1103 printdebug "*** WALK BOMB bare dgit import\n";
1104 $cl->{Why} = "bare dgit dsc import";
1108 } elsif ($ty eq 'VanillaMerge' or $ty eq 'MergedBreakwaters') {
1109 # User may have merged unstitched branch(es). We will
1110 # have now lost what ffq-prev was then (since the later
1111 # pseudomerge may introduce further changes). The effect
1112 # of resolving such a merge is that we may have to go back
1113 # further in history to find a merge base, since the one
1114 # which was reachable via ffq-prev is no longer findable.
1115 # This is suboptimal, but if it all works we'll have done
1117 # xxx we should warn the user in the docs about this
1121 # We expect to find a dominating anchor amongst the
1122 # inputs' anchors. That will be the new anchor.
1124 # More complicated is finding a merge base for the
1125 # breakwaters. We need a merge base that is a breakwater
1126 # commit. The ancestors of breakwater commits are more
1127 # breakwater commits and possibly upstream commits and the
1128 # ancestors of those upstream. Upstreams might have
1129 # arbitrary ancestors. But any upstream commit U is
1130 # either included in both anchors, in which case the
1131 # earlier anchor is a better merge base than any of U's
1132 # ancestors; or U is not included in the older anchor, in
1133 # which case U is not an ancestor of the vanilla merge at
1134 # all. So no upstream commit, nor any ancestor thereof,
1135 # is a best merge base. As for non-breakwater Debian
1136 # commits: these are never ancestors of any breakwater.
1138 # So any best merge base as found by git-merge-base
1139 # is a suitable breakwater anchor. Usually there will
1142 printdebug "*** MERGE\n";
1144 # xxx avoid calling walk without nogenerate when
1145 # we have a MergedBreakwater; instead call keycommits ?
1147 my @bwbcmd = (@git, qw(merge-base));
1148 my @ibcmd = (@git, qw(merge-base --all));
1149 my $might_be_in_bw = 1;
1151 my $ps = $cl->{Parents};
1153 foreach my $p (@$ps) {
1154 $prline->(" VanillaMerge ".$p->{Ix});
1156 my ($ptip, $pbw, $panchor) =
1157 walk $p->{CommitId}, 0, $report,
1158 $report_lprefix.' ';
1159 $p->{Laundered} = $p->{SeriesTip} = $ptip;
1160 $p->{Breakwater} = $p->{SeriesBase} = $pbw;
1161 $p->{Anchor} = $panchor;
1163 $best_anchor = $panchor if
1164 !defined $best_anchor or
1165 is_fast_fwd $best_anchor, $panchor;
1167 printdebug " MERGE BA best=".($best_anchor//'-').
1171 foreach my $p (@$ps) {
1172 $prline->(" VanillaMerge ".$p->{Ix});
1173 if (!is_fast_fwd $p->{Anchor}, $best_anchor) {
1174 $nomerge->('DivergentAnchor');
1175 } elsif ($p->{Anchor} eq $best_anchor) {
1176 print $report " SameAnchor" if $report;
1178 print $report " SupersededAnchor" if $report;
1180 if ($p->{Breakwater} eq $p->{CommitId}) {
1181 # this parent commit was its own breakwater,
1182 # ie it is part of the breakwater
1183 print $report " Breakwater" if $report;
1185 $might_be_in_bw = 0;
1187 push @bwbcmd, $p->{Breakwater};
1188 push @ibcmd, $p->{CommitId};
1191 if ($ok && $might_be_in_bw) {
1192 $prline->(" VanillaMerge MergedBreakwaters");
1193 $last_anchor = $best_anchor;
1194 $build_start->('MergedBreakwaters', $cur);
1197 $nomerge->("alleged merged-breakwater is not a breakwater")
1198 unless $ty eq 'VanillaMerge';
1200 my $bwb = cmdoutput @bwbcmd;
1202 # OK, now we have a breakwater base, but we need the merge
1203 # base for the interchange branch because we need the delta
1206 # This a the best merge base of our inputs which has the
1207 # breakwater merge base as an ancestor.
1210 grep { is_fast_fwd $bwb, $_ }
1215 or $nomerge->("no suitable interchange merge base");
1217 $prline->(" VanillaMerge Base");
1219 my ($btip, $bbw, $banchor) =
1220 walk $ib, 0, $report, $report_lprefix.' ';
1222 my $ibinfo = { SeriesTip => $btip,
1224 Anchor => $banchor };
1226 or $nomerge->("interchange merge-base ($ib)'s".
1227 " breakwater ($bbw)".
1228 " != breakwaters' merge-base ($bwb)");
1229 grep { $_->{Anchor} eq $ibinfo->{Anchor} } @$ps
1230 or $nomerge->("interchange merge-base ($ib)'s".
1231 " anchor ($ibinfo->{SeriesBase})".
1232 " != any merge input's anchor (".
1233 (join ' ', map { $_->{Anchor} } @$ps).
1237 $cl->{MergeInterchangeBaseInfo} = $ibinfo;
1238 $cl->{MergeBestAnchor} = $best_anchor;
1241 SpecialMethod => 'MergeCreateMergedBreakwaters',
1242 $xmsg->('constructed from vanilla merge',
1243 ' merged-breakwater'),
1247 SpecialMethod => 'MergeMergeSeries',
1249 $build_start->('MergeBreakwaters', $cur);
1251 printdebug "*** WALK BOMB unrecognised\n";
1257 printdebug "*** WALK prep done cur=$cur".
1258 " brw $#brw_cl upp $#upp_cl proc $#processed pm $#pseudomerges\n";
1260 return if $nogenerate;
1262 # Now we build it back up again
1268 $#upp_cl = $upp_limit if defined $upp_limit;
1270 my $committer_authline = calculate_committer_authline();
1272 printdebug "WALK REBUILD $build ".(scalar @processed)."\n";
1274 confess "internal error" unless $build eq (pop @processed)->{CommitId};
1277 mkdir $rd or $!==EEXIST or die $!;
1279 runcmd @git, qw(read-tree), $build;
1280 foreach my $cl (qw(Debian), (reverse @brw_cl),
1281 { SpecialMethod => 'RecordBreakwaterTip' },
1282 qw(Upstream), (reverse @upp_cl)) {
1284 $current_method = $cl;
1287 my $method = $cl->{SpecialMethod} // $current_method;
1288 my @parents = ($build);
1289 my $cltree = $cl->{CommitId};
1290 printdebug "WALK BUILD ".($cltree//'undef').
1291 " $method (rewriting=$rewriting)\n";
1292 if ($method eq 'Debian') {
1293 read_tree_debian($cltree);
1294 } elsif ($method eq 'Upstream') {
1295 read_tree_upstream($cltree);
1296 } elsif ($method eq 'StartRewrite') {
1299 } elsif ($method eq 'RecordBreakwaterTip') {
1300 $breakwater = $build;
1302 } elsif ($method eq 'DgitImportDebianUpdate') {
1303 read_tree_debian($cltree);
1304 } elsif ($method eq 'DgitImportUpstreamUpdate') {
1305 confess unless $rewriting;
1306 my $differs = (get_differs $build, $cltree);
1307 next unless $differs & D_UPS;
1308 read_tree_upstream($cltree);
1309 push @parents, map { $_->{CommitId} } @{ $cl->{OrigParents} };
1310 } elsif ($method eq 'MergeCreateMergedBreakwaters') {
1311 print "Found a general merge, will try to tidy it up.\n";
1313 read_tree_upstream($cl->{MergeBestAnchor});
1314 read_tree_upstream($cl->{MergeBestAnchor});
1315 read_tree_debian($cltree);
1316 @parents = map { $_->{Breakwater} } @{ $cl->{Parents} };
1317 } elsif ($method eq 'MergeMergeSeries') {
1318 print "Running merge resolution for $cl->{CommitId}...\n";
1319 $build = merge_series
1321 $cl->{MergeInterchangeBaseInfo},
1322 @{ $cl->{Parents} };
1323 $last_anchor = $cl->{MergeBestAnchor};
1324 my $check_differs = get_differs $build, $cl->{CommitId};
1325 # Breakwater changes which were in each side of the
1326 # merge should be in MergeCreateMergedBreakwaters
1327 # output. Upstream changes are exactly the result
1328 # of merge_series. So the only difference should
1329 # be potential laundry results.
1331 "merge misresolved: tree is not the same (%s %s d.%#x)",
1332 $cl->{CommitId}, $build, $check_differs)
1333 if $check_differs & ~D_PAT_ADD;
1334 print "Merge resolution successful.\n";
1337 confess "$method ?";
1340 my $procd = (pop @processed) // 'UNDEF';
1341 if ($cl ne $procd) {
1343 printdebug "WALK REWRITING NOW cl=$cl procd=$procd\n";
1346 my $newtree = cmdoutput @git, qw(write-tree);
1347 my $ch = $cl->{Hdr};
1348 $ch =~ s{^tree .*}{tree $newtree}m or confess "$ch ?";
1349 $ch =~ s{^parent .*\n}{}mg;
1350 $ch =~ s{(?=^author)}{
1351 join '', map { "parent $_\n" } @parents
1352 }me or confess "$ch ?";
1354 $ch =~ s{^committer .*$}{$committer_authline}m
1357 my $cf = "$rd/m$rewriting";
1358 open CD, ">", $cf or die $!;
1359 print CD $ch, "\n", $cl->{Msg} or die $!;
1361 my @cmd = (@git, qw(hash-object));
1362 push @cmd, qw(-w) if $rewriting;
1363 push @cmd, qw(-t commit), $cf;
1364 my $newcommit = cmdoutput @cmd;
1365 confess "$ch ?" unless $rewriting or $newcommit eq $cl->{CommitId};
1366 $build = $newcommit;
1367 if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
1368 $last_anchor = $cur;
1373 my $final_check = get_differs $build, $input;
1374 die sprintf "internal error %#x %s %s", $final_check, $input, $build
1375 if $final_check & ~D_PAT_ADD;
1377 my @r = ($build, $breakwater, $last_anchor);
1378 printdebug "*** WALK RETURN @r\n";
1383 git_check_unmodified();
1384 return git_rev_parse qw(HEAD);
1387 sub update_head ($$$) {
1388 my ($old, $new, $mrest) = @_;
1389 push @deferred_updates, "update HEAD $new $old";
1390 run_deferred_updates $mrest;
1393 sub update_head_checkout ($$$) {
1394 my ($old, $new, $mrest) = @_;
1395 update_head $old, $new, $mrest;
1396 runcmd @git, qw(reset --hard);
1399 sub update_head_postlaunder ($$$) {
1400 my ($old, $tip, $reflogmsg) = @_;
1401 return if $tip eq $old;
1402 print "git-debrebase: laundered (head was $old)\n";
1403 update_head $old, $tip, $reflogmsg;
1404 # no tree changes except debian/patches
1405 runcmd @git, qw(rm --quiet --ignore-unmatch -rf debian/patches);
1408 sub currently_rebasing() {
1409 foreach (qw(rebase-merge rebase-apply)) {
1410 return 1 if stat_exists "$maindir_gitdir/$_";
1415 sub bail_if_rebasing() {
1416 fail "you are in the middle of a git-rebase already"
1417 if currently_rebasing();
1420 sub do_launder_head ($) {
1421 my ($reflogmsg) = @_;
1422 my $old = get_head();
1424 my ($tip,$breakwater) = walk $old;
1426 update_head_postlaunder $old, $tip, $reflogmsg;
1427 return ($tip,$breakwater);
1430 sub cmd_launder_v0 () {
1431 badusage "no arguments to launder-v0 allowed" if @ARGV;
1432 my $old = get_head();
1433 my ($tip,$breakwater,$last_anchor) = walk $old;
1434 update_head_postlaunder $old, $tip, 'launder';
1435 printf "# breakwater tip\n%s\n", $breakwater;
1436 printf "# working tip\n%s\n", $tip;
1437 printf "# last anchor\n%s\n", $last_anchor;
1440 sub defaultcmd_rebase () {
1441 push @ARGV, @{ $opt_defaultcmd_interactive // [] };
1442 my ($tip,$breakwater) = do_launder_head 'launder for rebase';
1443 runcmd @git, qw(rebase), @ARGV, $breakwater if @ARGV;
1446 sub cmd_analyse () {
1447 badusage "analyse does not support any options"
1448 if @ARGV and $ARGV[0] =~ m/^-/;
1449 badusage "too many arguments to analyse" if @ARGV>1;
1452 $old = git_rev_parse $old;
1454 $old = git_rev_parse 'HEAD';
1456 my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
1457 STDOUT->error and die $!;
1460 sub ffq_prev_branchinfo () {
1461 my $current = git_get_symref();
1462 return gdr_ffq_prev_branchinfo($current);
1465 sub ffq_check ($;$$) {
1466 # calls $ff and/or $notff zero or more times
1467 # then returns either (status,message) where status is
1472 # or (undef,undef, $ffq_prev,$gdrlast)
1473 # $ff and $notff are called like this:
1474 # $ff->("message for stdout\n");
1475 # $notff->('snag-name', $message);
1476 # normally $currentval should be HEAD
1477 my ($currentval, $ff, $notff) =@_;
1479 $ff //= sub { print $_[0] or die $!; };
1482 my ($status, $message, $current, $ffq_prev, $gdrlast)
1483 = ffq_prev_branchinfo();
1484 return ($status, $message) unless $status eq 'branch';
1486 my $exists = git_get_ref $ffq_prev;
1487 return ('exists',"$ffq_prev already exists") if $exists;
1489 return ('not-branch', 'HEAD symref is not to refs/heads/')
1490 unless $current =~ m{^refs/heads/};
1493 my @check_specs = split /\;/, (cfg "branch.$branch.ffq-ffrefs",1) // '*';
1496 printdebug "ffq check_specs @check_specs\n";
1499 my ($lrref, $desc) = @_;
1500 printdebug "ffq might check $lrref ($desc)\n";
1502 for my $chk (@check_specs) {
1504 $invert = $glob =~ s{^[!^]}{};
1505 last if fnmatch $glob, $lrref;
1508 my $lrval = git_get_ref $lrref;
1509 return unless length $lrval;
1511 if (is_fast_fwd $lrval, $currentval) {
1512 $ff->("OK, you are ahead of $lrref\n");
1513 $checked{$lrref} = 1;
1514 } elsif (is_fast_fwd $currentval, $lrval) {
1515 $checked{$lrref} = -1;
1516 $notff->('behind', "you are behind $lrref, divergence risk");
1518 $checked{$lrref} = -1;
1519 $notff->('diverged', "you have diverged from $lrref");
1523 my $merge = cfg "branch.$branch.merge",1;
1524 if (defined $merge and $merge =~ m{^refs/heads/}) {
1526 printdebug "ffq merge $rhs\n";
1527 my $check_remote = sub {
1528 my ($remote, $desc) = @_;
1529 printdebug "ffq check_remote ".($remote//'undef')." $desc\n";
1530 return unless defined $remote;
1531 $check->("refs/remotes/$remote/$rhs", $desc);
1533 $check_remote->((scalar cfg "branch.$branch.remote",1),
1534 'remote fetch/merge branch');
1535 $check_remote->((scalar cfg "branch.$branch.pushRemote",1) //
1536 (scalar cfg "branch.$branch.pushDefault",1),
1537 'remote push branch');
1539 if ($branch =~ m{^dgit/}) {
1540 $check->("refs/remotes/dgit/$branch", 'remote dgit branch');
1541 } elsif ($branch =~ m{^master$}) {
1542 $check->("refs/remotes/dgit/dgit/sid", 'remote dgit branch for sid');
1544 return (undef, undef, $ffq_prev, $gdrlast);
1547 sub record_ffq_prev_deferred () {
1548 # => ('status', "message")
1550 # deferred message is undef
1555 # if not ff from some branch we should be ff from, is an snag
1556 # if "deferred", will have added something about that to
1557 # @deferred_update_messages, and also maybe printed (already)
1558 # some messages about ff checks
1560 my $currentval = get_head();
1562 my ($status,$message, $ffq_prev,$gdrlast) = ffq_check $currentval;
1563 return ($status,$message) if defined $status;
1567 push @deferred_updates, "update $ffq_prev $currentval $git_null_obj";
1568 push @deferred_updates, "delete $gdrlast";
1569 push @deferred_update_messages, "Recorded previous head for preservation";
1570 return ('deferred', undef);
1573 sub record_ffq_auto () {
1574 my ($status, $message) = record_ffq_prev_deferred();
1575 if ($status eq 'deferred' || $status eq 'exists') {
1577 snag $status, "could not record ffq-prev: $message";
1582 sub ffq_prev_info () {
1584 # => ($ffq_prev, $gdrlast, $ffq_prev_commitish)
1585 my ($status, $message, $current, $ffq_prev, $gdrlast)
1586 = ffq_prev_branchinfo();
1587 if ($status ne 'branch') {
1588 snag $status, "could not check ffq-prev: $message";
1591 my $ffq_prev_commitish = $ffq_prev && git_get_ref $ffq_prev;
1592 return ($ffq_prev, $gdrlast, $ffq_prev_commitish);
1595 sub stitch ($$$$$) {
1596 my ($old_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose) = @_;
1598 push @deferred_updates, "delete $ffq_prev $ffq_prev_commitish";
1600 if (is_fast_fwd $old_head, $ffq_prev_commitish) {
1601 my $differs = get_differs $old_head, $ffq_prev_commitish;
1602 unless ($differs & ~D_PAT_ADD) {
1603 # ffq-prev is ahead of us, and the only tree changes it has
1604 # are possibly addition of things in debian/patches/.
1605 # Just wind forwards rather than making a pointless pseudomerge.
1606 push @deferred_updates,
1607 "update $gdrlast $ffq_prev_commitish $git_null_obj";
1608 update_head_checkout $old_head, $ffq_prev_commitish,
1609 "stitch (fast forward)";
1614 # We make pseudomerges with L as the contributing parent.
1615 # This makes git rev-list --first-parent work properly.
1616 my $new_head = make_commit [ $old_head, $ffq_prev ], [
1617 'Declare fast forward / record previous work',
1618 "[git-debrebase pseudomerge: $prose]",
1620 push @deferred_updates, "update $gdrlast $new_head $git_null_obj";
1621 update_head $old_head, $new_head, "stitch: $prose";
1624 sub do_stitch ($;$) {
1625 my ($prose, $unclean) = @_;
1627 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
1628 if (!$ffq_prev_commitish) {
1629 fail "No ffq-prev to stitch." unless $opt_noop_ok;
1632 my $dangling_head = get_head();
1634 keycommits $dangling_head, $unclean,$unclean,$unclean;
1637 stitch($dangling_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose);
1640 sub upstream_commitish_search ($$) {
1641 my ($upstream_version, $tried) = @_;
1642 # todo: at some point maybe use git-deborig to do this
1643 foreach my $tagpfx ('', 'v', 'upstream/') {
1644 my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
1645 my $new_upstream = git_get_ref "refs/tags/$tag";
1647 return $new_upstream if length $new_upstream;
1651 sub resolve_upstream_version ($$) {
1652 my ($new_upstream, $upstream_version) = @_;
1654 if (!defined $new_upstream) {
1656 $new_upstream = upstream_commitish_search $upstream_version, \@tried;
1657 if (!length $new_upstream) {
1658 fail "Could not determine appropriate upstream commitish.\n".
1659 " (Tried these tags: @tried)\n".
1660 " Check version, and specify upstream commitish explicitly.";
1663 $new_upstream = git_rev_parse $new_upstream;
1665 return $new_upstream;
1668 sub cmd_new_upstream () {
1669 # automatically and unconditionally launders before rebasing
1670 # if rebase --abort is used, laundering has still been done
1674 badusage "need NEW-VERSION [UPS-COMMITTISH]" unless @ARGV >= 1;
1676 # parse args - low commitment
1677 my $spec_version = shift @ARGV;
1678 my $new_version = (new Dpkg::Version $spec_version, check => 1);
1679 fail "bad version number \`$spec_version'" unless defined $new_version;
1680 if ($new_version->is_native()) {
1681 $new_version = (new Dpkg::Version "$spec_version-1", check => 1);
1684 my $new_upstream = shift @ARGV;
1685 my $new_upstream_version = upstreamversion $new_version;
1687 resolve_upstream_version $new_upstream, $new_upstream_version;
1692 my ($n, @x) = @_; # may be ''
1693 my $pc = $pieces{$n} //= {
1695 Desc => ($n ? "upstream piece \`$n'" : "upstream (main piece"),
1697 while (my $k = shift @x) { $pc->{$k} = shift @x; }
1702 my $newpiece = sub {
1703 my ($n, @x) = @_; # may be ''
1704 my $pc = $piece->($n, @x, NewIx => (scalar @newpieces));
1705 push @newpieces, $pc;
1710 New => $new_upstream,
1712 while (@ARGV && $ARGV[0] !~ m{^-}) {
1713 my $n = shift @ARGV;
1715 badusage "for each EXTRA-UPS-NAME need EXTRA-UPS-COMMITISH"
1716 unless @ARGV && $ARGV[0] !~ m{^-};
1718 my $c = git_rev_parse shift @ARGV;
1719 die unless $n =~ m/^$extra_orig_namepart_re$/;
1720 $newpiece->($n, New => $c);
1723 # now we need to investigate the branch this generates the
1724 # laundered version but we don't switch to it yet
1725 my $old_head = get_head();
1726 my ($old_laundered_tip,$old_bw,$old_anchor) = walk $old_head;
1728 my $old_bw_cl = classify $old_bw;
1729 my $old_anchor_cl = classify $old_anchor;
1731 if (!$old_anchor_cl->{OrigParents}) {
1732 snag 'anchor-treated',
1733 'old anchor is recognised due to --anchor, cannot check upstream';
1735 $old_upstream = parsecommit
1736 $old_anchor_cl->{OrigParents}[0]{CommitId};
1737 $piece->('', Old => $old_upstream->{CommitId});
1740 if ($old_upstream && $old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
1741 if ($old_upstream->{Msg} =~
1742 m{^\[git-debrebase upstream-combine (\.(?: $extra_orig_namepart_re)+)\:.*\]$}m
1744 my @oldpieces = (split / /, $1);
1745 my $old_n_parents = scalar @{ $old_upstream->{Parents} };
1746 if ($old_n_parents != @oldpieces &&
1747 $old_n_parents != @oldpieces + 1) {
1748 snag 'upstream-confusing', sprintf
1749 "previous upstream combine %s".
1750 " mentions %d pieces (each implying one parent)".
1751 " but has %d parents".
1752 " (one per piece plus maybe a previous combine)",
1753 $old_upstream->{CommitId},
1754 (scalar @oldpieces),
1756 } elsif ($oldpieces[0] ne '.') {
1757 snag 'upstream-confusing', sprintf
1758 "previous upstream combine %s".
1759 " first piece is not \`.'",
1763 foreach my $i (0..$#oldpieces) {
1764 my $n = $oldpieces[$i];
1765 my $hat = 1 + $i + ($old_n_parents - @oldpieces);
1766 $piece->($n, Old => $old_upstream->{CommitId}.'^'.$hat);
1770 snag 'upstream-confusing',
1771 "previous upstream $old_upstream->{CommitId} is from".
1772 " git-debrebase but not an \`upstream-combine' commit";
1776 foreach my $pc (values %pieces) {
1777 if (!$old_upstream) {
1778 # we have complained already
1779 } elsif (!$pc->{Old}) {
1780 snag 'upstream-new-piece',
1781 "introducing upstream piece \`$pc->{Name}'";
1782 } elsif (!$pc->{New}) {
1783 snag 'upstream-rm-piece',
1784 "dropping upstream piece \`$pc->{Name}'";
1785 } elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
1786 snag 'upstream-not-ff',
1787 "not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}";
1791 printdebug "%pieces = ", (dd \%pieces), "\n";
1792 printdebug "\@newpieces = ", (dd \@newpieces), "\n";
1800 my @upstream_merge_parents;
1803 push @upstream_merge_parents, $old_upstream->{CommitId};
1806 foreach my $pc (@newpieces) { # always has '' first
1808 read_tree_subdir $pc->{Name}, $pc->{New};
1810 runcmd @git, qw(read-tree), $pc->{New};
1812 push @upstream_merge_parents, $pc->{New};
1815 # index now contains the new upstream
1817 if (@newpieces > 1) {
1818 # need to make the upstream subtree merge commit
1819 $new_upstream = make_commit \@upstream_merge_parents,
1820 [ "Combine upstreams for $new_upstream_version",
1821 ("[git-debrebase upstream-combine . ".
1822 (join " ", map { $_->{Name} } @newpieces[1..$#newpieces]).
1827 # $new_upstream is either the single upstream commit, or the
1828 # combined commit we just made. Either way it will be the
1829 # "upstream" parent of the anchor merge.
1831 read_tree_subdir 'debian', "$old_bw:debian";
1833 # index now contains the anchor merge contents
1834 $new_bw = make_commit [ $old_bw, $new_upstream ],
1835 [ "Update to upstream $new_upstream_version",
1836 "[git-debrebase anchor: new upstream $new_upstream_version, merge]",
1839 my $clogsignoff = cmdoutput qw(git show),
1840 '--pretty=format:%an <%ae> %aD',
1843 # Now we have to add a changelog stanza so the Debian version
1845 die if unlink "debian";
1846 die $! unless $!==ENOENT or $!==ENOTEMPTY;
1847 unlink "debian/changelog" or $!==ENOENT or die $!;
1848 mkdir "debian" or die $!;
1849 open CN, ">", "debian/changelog" or die $!;
1850 my $oldclog = git_cat_file ":debian/changelog";
1851 $oldclog =~ m/^($package_re) \(\S+\) / or
1852 fail "cannot parse old changelog to get package name";
1854 print CN <<END, $oldclog or die $!;
1855 $p ($new_version) UNRELEASED; urgency=medium
1857 * Update to new upstream version $new_upstream_version.
1863 runcmd @git, qw(update-index --add --replace), 'debian/changelog';
1865 # Now we have the final new breakwater branch in the index
1866 $new_bw = make_commit [ $new_bw ],
1867 [ "Update changelog for new upstream $new_upstream_version",
1868 "[git-debrebase: new upstream $new_upstream_version, changelog]",
1872 # we have constructed the new breakwater. we now need to commit to
1873 # the laundering output, because git-rebase can't easily be made
1874 # to make a replay list which is based on some other branch
1876 update_head_postlaunder $old_head, $old_laundered_tip,
1877 'launder for new upstream';
1879 my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw, @ARGV);
1880 local $ENV{GIT_REFLOG_ACTION} = git_reflog_action_msg
1881 "debrebase new-upstream $new_version: rebase";
1883 # now it's for the user to sort out
1886 sub cmd_record_ffq_prev () {
1887 badusage "no arguments allowed" if @ARGV;
1888 my ($status, $msg) = record_ffq_prev_deferred();
1889 if ($status eq 'exists' && $opt_noop_ok) {
1890 print "Previous head already recorded\n" or die $!;
1891 } elsif ($status eq 'deferred') {
1892 run_deferred_updates 'record-ffq-prev';
1894 fail "Could not preserve: $msg";
1899 badusage "no arguments allowed" if @ARGV;
1900 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
1901 print "$bw\n" or die $!;
1904 sub cmd_breakwater () {
1905 badusage "no arguments allowed" if @ARGV;
1906 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
1907 print "$bw\n" or die $!;
1911 badusage "no arguments allowed" if @ARGV;
1913 # todo: gdr status should print divergence info
1914 # todo: gdr status should print upstream component(s) info
1915 # todo: gdr should leave/maintain some refs with this kind of info ?
1917 my $oldest = { Badness => 0 };
1920 my ($badness, $ourmsg, $snagname, $dummy, $cl, $kcmsg) = @_;
1921 if ($oldest->{Badness} < $badness) {
1922 $oldest = $newest = undef;
1925 Badness => $badness,
1926 CommitId => $cl->{CommitId},
1930 $newest //= $oldest;
1932 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'),
1933 sub { $note->(1, 'branch contains furniture (not laundered)', @_); },
1934 sub { $note->(2, 'branch is unlaundered', @_); },
1935 sub { $note->(3, 'branch needs laundering', @_); },
1936 sub { $note->(4, 'branch not in git-debrebase form', @_); };
1938 my $prcommitinfo = sub {
1940 flush STDOUT or die $!;
1941 runcmd @git, qw(--no-pager log -n1),
1942 '--pretty=format: %h %s%n',
1946 print "current branch contents, in git-debrebase terms:\n";
1947 if (!$oldest->{Badness}) {
1948 print " branch is laundered\n";
1950 print " $oldest->{OurMsg}\n";
1952 foreach my $info ($oldest, $newest) {
1953 my $cid = $info->{CommitId};
1954 next if $cid eq $printed;
1956 print " $info->{KcMsg}\n";
1957 $prcommitinfo->($cid);
1962 my ($cid, $what) = @_;
1963 if (!defined $cid) {
1964 print " $what is not well-defined\n";
1967 $prcommitinfo->($cid);
1970 print "key git-debrebase commits:\n";
1971 $prab->($anchor, 'anchor');
1972 $prab->($bw, 'breakwater');
1974 my ($ffqstatus, $ffq_msg, $current, $ffq_prev, $gdrlast) =
1975 ffq_prev_branchinfo();
1977 print "branch and ref status, in git-debrebase terms:\n";
1979 print " $ffq_msg\n";
1981 $ffq_prev = git_get_ref $ffq_prev;
1982 $gdrlast = git_get_ref $gdrlast;
1984 print " unstitched; previous tip was:\n";
1985 $prcommitinfo->($ffq_prev);
1986 } elsif (!$gdrlast) {
1987 print " stitched? (no record of git-debrebase work)\n";
1988 } elsif (is_fast_fwd $gdrlast, 'HEAD') {
1989 print " stitched\n";
1991 print " not git-debrebase (diverged since last stitch)\n"
1994 print "you are currently rebasing\n" if currently_rebasing();
1998 my $prose = 'stitch';
1999 getoptions("stitch",
2000 'prose=s', \$prose);
2001 badusage "no arguments allowed" if @ARGV;
2002 do_stitch $prose, 0;
2004 sub cmd_prepush () { cmd_stitch(); }
2007 badusage "no arguments allowed" if @ARGV;
2008 do_launder_head 'launder for git-debrebase quick';
2012 sub cmd_conclude () {
2013 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
2014 if (!$ffq_prev_commitish) {
2015 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2018 my $dangling_head = get_head();
2020 badusage "no arguments allowed" if @ARGV;
2021 do_launder_head 'launder for git-debrebase quick';
2026 if (currently_rebasing()) {
2027 runcmd @git, qw(rebase --abort);
2029 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
2030 if (!$ffq_prev_commitish) {
2031 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2034 my $scrapping_head = get_head();
2035 badusage "no arguments allowed" if @ARGV;
2036 push @deferred_updates,
2037 "update $gdrlast $ffq_prev_commitish $git_null_obj",
2038 "update $ffq_prev $git_null_obj $ffq_prev_commitish";
2040 update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
2043 sub make_patches_staged ($) {
2045 # Produces the patches that would result from $head if it were
2047 my ($secret_head, $secret_bw, $last_anchor) = walk $head;
2050 gbp_pq_export 'bw', $secret_bw, $secret_head;
2054 sub make_patches ($) {
2056 keycommits $head, 0, \&snag;
2057 make_patches_staged $head;
2060 my $ptree = cmdoutput @git, qw(write-tree --prefix=debian/patches/);
2061 runcmd @git, qw(read-tree), $head;
2062 read_tree_subdir 'debian/patches', $ptree;
2063 $out = make_commit [$head], [
2064 'Commit patch queue (exported by git-debrebase)',
2065 '[git-debrebase: export and commit patches]',
2071 sub cmd_make_patches () {
2072 my $opt_quiet_would_amend;
2073 getoptions("make-patches",
2074 'quiet-would-amend!', \$opt_quiet_would_amend);
2075 badusage "no arguments allowed" if @ARGV;
2077 my $old_head = get_head();
2078 my $new = make_patches $old_head;
2079 my $d = get_differs $old_head, $new;
2081 fail "No (more) patches to export." unless $opt_noop_ok;
2083 } elsif ($d == D_PAT_ADD) {
2085 update_head_checkout $old_head, $new, 'make-patches';
2087 print STDERR failmsg
2088 "Patch export produced patch amendments".
2089 " (abandoned output commit $new).".
2090 " Try laundering first."
2091 unless $opt_quiet_would_amend;
2096 sub cmd_convert_from_gbp () {
2097 badusage "want only 1 optional argument, the upstream git commitish"
2100 my $clogp = parsechangelog();
2101 my $version = $clogp->{'Version'}
2102 // die "missing Version from changelog";
2104 my ($upstream_spec) = @ARGV;
2106 my $upstream_version = upstreamversion $version;
2108 resolve_upstream_version($upstream_spec, $upstream_version);
2110 my $old_head = get_head();
2112 my $upsdiff = get_differs $upstream, $old_head;
2113 if ($upsdiff & D_UPS) {
2114 runcmd @git, qw(--no-pager diff --stat),
2115 $upstream, $old_head,
2116 qw( -- :!/debian :/);
2118 upstream ($upstream_spec) and HEAD are not
2119 identical in upstream files. See diffstat above, or run
2120 git diff $upstream_spec HEAD -- :!/debian :/
2124 if (!is_fast_fwd $upstream, $old_head) {
2125 snag 'upstream-not-ancestor',
2126 "upstream ($upstream) is not an ancestor of HEAD";
2128 my $wrong = cmdoutput
2129 (@git, qw(rev-list --ancestry-path), "$upstream..HEAD",
2130 qw(-- :/ :!/debian));
2131 if (length $wrong) {
2132 snag 'unexpected-upstream-changes',
2133 "history between upstream ($upstream) and HEAD contains direct changes to upstream files - are you sure this is a gbp (patches-unapplied) branch?";
2134 print STDERR "list expected changes with: git log --stat --ancestry-path $upstream_spec..HEAD -- :/ ':!/debian'\n";
2138 if ((git_cat_file "$upstream:debian")[0] ne 'missing') {
2139 snag 'upstream-has-debian',
2140 "upstream ($upstream) contains debian/ directory";
2143 my $previous_dgit_view = eval {
2144 my @clogcmd = qw(dpkg-parsechangelog --format rfc822 -n2);
2146 parsechangelog_loop \@clogcmd, 'debian/changelog', sub {
2147 my ($stz, $desc) = @_;
2148 no warnings qw(exiting);
2149 printdebug 'CHANGELOG ', Dumper($desc, $stz);
2150 next unless $stz->{Date};
2151 next unless $stz->{Distribution} ne 'UNRELEASED';
2152 $lvsn = $stz->{Version};
2153 $suite = $stz->{Distribution};
2156 die "neither of the first two changelog entries are released\n"
2157 unless defined $lvsn;
2158 print "last finished-looking changelog entry: ($lvsn) $suite\n";
2159 my $mtag_pat = debiantag_maintview $lvsn, '*';
2160 my $mtag = cmdoutput @git, qw(describe --always --abbrev=0 --match),
2162 die "could not find suitable maintainer view tag $mtag_pat\n"
2163 unless $mtag_pat =~ m{/};
2164 is_fast_fwd $mtag, 'HEAD' or
2165 die "HEAD is not FF from maintainer tag $mtag!";
2166 my $dtag = "archive/$mtag";
2167 is_fast_fwd $mtag, $dtag or
2168 die "dgit view tag $dtag is not FF from maintainer tag $mtag";
2169 print "will stitch in dgit view, $dtag\n";
2170 git_rev_parse $dtag;
2172 if (!$previous_dgit_view) {
2175 print STDERR "cannot stitch in dgit view: $@\n";
2178 snags_maybe_bail_early();
2184 runcmd @git, qw(checkout -q -b gdr-internal), $old_head;
2185 # make a branch out of the patch queue - we'll want this in a mo
2186 runcmd qw(gbp pq import);
2187 # strip the patches out
2188 runcmd @git, qw(checkout -q gdr-internal~0);
2189 rm_subdir_cached 'debian/patches';
2190 $work = make_commit ['HEAD'], [
2191 'git-debrebase convert-from-gbp: drop patches from tree',
2192 'Delete debian/patches, as part of converting to git-debrebase format.',
2193 '[git-debrebase convert-from-gbp: drop patches from tree]'
2195 # make the anchor merge
2196 # the tree is already exactly right
2197 $work = make_commit [$work, $upstream], [
2198 'git-debrebase import: declare upstream',
2199 'First breakwater merge.',
2200 '[git-debrebase anchor: declare upstream]'
2203 # rebase the patch queue onto the new breakwater
2204 runcmd @git, qw(reset --quiet --hard patch-queue/gdr-internal);
2205 runcmd @git, qw(rebase --quiet --onto), $work, qw(gdr-internal);
2206 $work = git_rev_parse 'HEAD';
2208 if ($previous_dgit_view) {
2209 $work = make_commit [$work, $previous_dgit_view], [
2210 'git-debrebase import: declare ff from dgit archive view',
2211 '[git-debrebase pseudomerge: import-from-gbp]',
2218 update_head_checkout $old_head, $work, 'convert-from-gbp';
2221 sub cmd_convert_to_gbp () {
2222 badusage "no arguments allowed" if @ARGV;
2223 my $head = get_head();
2224 my (undef, undef, undef, $ffq, $gdrlast) = ffq_prev_branchinfo();
2225 keycommits $head, 0;
2227 make_patches_staged $head;
2229 $out = make_commit ['HEAD'], [
2230 'Commit patch queue (converted from git-debrebase format)',
2231 '[git-debrebase convert-to-gbp: commit patches]',
2235 push @deferred_updates, "delete $ffq";
2236 push @deferred_updates, "delete $gdrlast";
2239 update_head_checkout $head, $out, "convert to gbp (v0)";
2240 print <<END or die $!;
2241 git-debrebase: converted to git-buildpackage branch format
2242 git-debrebase: WARNING: do not now run "git-debrebase" any more
2243 git-debrebase: WARNING: doing so would drop all upstream patches!
2247 sub cmd_convert_from_dgit_view () {
2248 my $clogp = parsechangelog();
2250 my $bpd = (cfg 'dgit.default.build-products-dir',1) // '..';
2256 getoptions("convert-from-dgit-view",
2257 'diagnose!', \$diagnose,
2258 'build-products-dir:s', \$bpd,
2259 'origs!', \$do_origs,
2261 'always-convert-anyway!', \$always);
2262 fail "takes 1 optional argument, the upstream commitish" if @ARGV>1;
2267 my $spec = shift @ARGV;
2268 my $commit = git_rev_parse "$spec^{commit}";
2269 push @upstreams, { Commit => $commit,
2270 Source => "$ARGV[0], from command line",
2275 my $head = get_head();
2279 my $trouble = sub { $troubles++; };
2280 keycommits $head, sub{}, sub{}, $trouble, $trouble;
2281 printdebug "troubles=$troubles\n";
2284 $us: Branch already seems to be in git-debrebase format!
2285 $us: --always-convert-anyway would do the conversion operation anyway
2286 $us: but is probably a bad idea. Probably, you wanted to do nothing.
2288 fail "Branch already in git-debrebase format." unless $opt_noop_ok;
2293 snags_maybe_bail_early();
2295 my $version = upstreamversion $clogp->{Version};
2296 print STDERR "Considering possible commits corresponding to upstream:\n";
2301 my $ups_tag = upstream_commitish_search $version, \@tried;
2303 my $this = "git tag $tried[-1]";
2304 push @upstreams, { Commit => $ups_tag,
2309 " git tag: no suitable tag found (tried %s)\n",
2314 my $p = $clogp->{'Source'};
2315 # we do a quick check to see if there are plausible origs
2317 if (!opendir BPD, $bpd) {
2318 die "$bpd: opendir: $!" unless $!==ENOENT;
2320 while ($!=0, my $f = readdir BPD) {
2321 next unless is_orig_file_of_p_v $f, $p, $version;
2323 " orig: found what looks like a .orig, %s\n",
2328 die "read $bpd: $!" if $!;
2332 my $tree = cmdoutput
2333 @dgit, qw(--build-products-dir), $bpd,
2334 qw(print-unapplied-treeish);
2337 runcmd @git, qw(reset --quiet), $tree, qw(-- .);
2338 rm_subdir_cached 'debian';
2339 $tree = cmdoutput @git, qw(write-tree);
2340 my $ups_synth = make_commit [], [ <<END, <<END,
2341 Import effective orig tree for upstream version $version
2343 This includes the contents of the .orig(s), minus any debian/ directory.
2345 [git-debrebase import-from-dgit-view upstream-import-convert: $version]
2348 push @upstreams, { Commit => $ups_synth,
2349 Source => "orig(s) imported via dgit",
2354 " orig: no suitable origs found (looked for %s in %s)\n",
2355 "${p}_".(stripeoch $version)."...", $bpd;
2360 my $some_patches = stat_exists 'debian/patches/series';
2362 print STDERR "Evaluating possible commits corresponding to upstream:\n";
2365 foreach my $u (@upstreams) {
2369 runcmd @git, qw(reset --quiet), $u->{Commit}, qw(-- .);
2370 runcmd @git, qw(checkout), $u->{Commit}, qw(-- .);
2371 runcmd @git, qw(clean -xdff);
2372 runcmd @git, qw(checkout), $head, qw(-- debian);
2373 if ($some_patches) {
2374 rm_subdir_cached 'debian/patches';
2375 $work = make_commit [ $work ], [
2376 'git-debrebase convert-from-dgit-view: drop upstream changes from breakwater',
2377 "Drop upstream changes, and delete debian/patches, as part of converting\n".
2378 "to git-debrebase format. Upstream changes will appear as commits.",
2379 '[git-debrebase convert-from-dgit-view: drop patches from tree]'
2382 $work = make_commit [ $work, $u->{Commit} ], [
2383 'git-debrebase convert-from-dgit-view: declare upstream',
2384 '(Re)constructed breakwater merge.',
2385 '[git-debrebase anchor: declare upstream]'
2387 runcmd @git, qw(checkout --quiet -b mk), $work;
2388 if ($some_patches) {
2389 runcmd @git, qw(checkout), $head, qw(-- debian/patches);
2390 runcmd @git, qw(reset --quiet);
2391 my @gbp_cmd = (qw(gbp pq import));
2393 my $gbp_err = "../gbp-pq-err";
2394 @gbp_cmd = shell_cmd "exec >$gbp_err 2>&1", @gbp_cmd;
2396 my $r = system @gbp_cmd;
2399 " %s: couldn't apply patches: gbp pq %s",
2400 $u->{Source}, waitstatusmsg();
2404 my $work = git_rev_parse qw(HEAD);
2405 my $diffout = cmdoutput @git, qw(diff-tree --stat HEAD), $work;
2406 if (length $diffout) {
2408 " $u->{Source}: applying patches gives different tree\n";
2409 print STDERR $diffout if $diagnose;
2413 $u->{Result} = $work;
2421 Could not find or construct a suitable upstream commit.
2422 Rerun adding --diagnose after convert-from-dgit-view, or pass a
2423 upstream commmit explicitly or provide suitable origs.
2427 printf STDERR "Yes, will base new branch on %s\n", $result->{Source};
2429 ffq_check $result->{Result};
2431 update_head_checkout $head, $result->{Result},
2432 'convert-from-dgit-view';
2435 sub cmd_downstream_rebase_launder_v0 () {
2436 badusage "needs 1 argument, the baseline" unless @ARGV==1;
2438 $base = git_rev_parse $base;
2439 my $old_head = get_head();
2440 my $current = $old_head;
2443 if ($current eq $base) {
2444 $topmost_keep //= $current;
2445 print " $current BASE stop\n";
2448 my $cl = classify $current;
2449 print " $current $cl->{Type}";
2451 my $p0 = $cl->{Parents}[0]{CommitId};
2453 if ($cl->{Type} eq 'Pseudomerge') {
2454 print " ^".($cl->{Contributor}{Ix}+1);
2455 $next = $cl->{Contributor}{CommitId};
2456 } elsif ($cl->{Type} eq 'AddPatches' or
2457 $cl->{Type} eq 'Changelog') {
2467 $topmost_keep //= $current;
2469 die "to-be stripped changes not on top of the branch\n"
2474 if ($topmost_keep eq $old_head) {
2475 print "unchanged\n";
2477 print "updating to $topmost_keep\n";
2478 update_head_checkout
2479 $old_head, $topmost_keep,
2480 'downstream-rebase-launder-v0';
2486 "D+" => \$debuglevel,
2487 'noop-ok', => \$opt_noop_ok,
2488 'f=s' => \@snag_force_opts,
2489 'anchor=s' => \@opt_anchors,
2490 '--dgit=s' => \($dgit[0]),
2493 my ($opt,$val) = @_;
2494 badusage "git-debrebase: no cuddling to -i for git-rebase"
2496 die if $opt_defaultcmd_interactive; # should not happen
2497 $opt_defaultcmd_interactive = [ qw(-i) ];
2498 # This access to @ARGV is excessive familiarity with
2499 # Getopt::Long, but there isn't another sensible
2500 # approach. '-i=s{0,}' does not work with bundling.
2501 push @$opt_defaultcmd_interactive, @ARGV;
2504 'help' => sub { print $usage_message or die $!; finish 0; },
2507 initdebug('git-debrebase ');
2508 enabledebug if $debuglevel;
2510 my $toplevel = cmdoutput @git, qw(rev-parse --show-toplevel);
2511 chdir $toplevel or die "chdir $toplevel: $!";
2513 $rd = fresh_playground "$playprefix/misc";
2515 @opt_anchors = map { git_rev_parse $_ } @opt_anchors;
2517 if (!@ARGV || $opt_defaultcmd_interactive || $ARGV[0] =~ m{^-}) {
2518 defaultcmd_rebase();
2520 my $cmd = shift @ARGV;
2523 $cmdfn = ${*::}{"cmd_$cmdfn"};
2525 $cmdfn or badusage "unknown git-debrebase sub-operation $cmd";