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 $classify->("VanillaMerge");
813 sub keycommits ($;$$$$$) {
814 my ($head, $furniture, $unclean, $trouble, $fatal, $claimed_bw) = @_;
815 # => ($anchor, $breakwater)
817 # $unclean->("unclean-$tagsfx", $msg, $cl)
818 # $furniture->("unclean-$tagsfx", $msg, $cl)
819 # $dgitimport->("unclean-$tagsfx", $msg, $cl))
820 # is callled for each situation or commit that
821 # wouldn't be found in a laundered branch
822 # $furniture is for furniture commits such as might be found on an
823 # interchange branch (pseudomerge, d/patches, changelog)
824 # $trouble is for things whnich prevent the return of
825 # anchor and breakwater information; if that is ignored,
826 # then keycommits returns (undef, undef) instead.
827 # $fatal is for unprocessable commits, and should normally cause
828 # a failure. If ignored, agaion, (undef, undef) is returned.
830 # If $claimed_bw, this is supposed to be a breakwater commit.
832 # If a callback is undef, fail is called instead.
833 # If a callback is defined but false, the situation is ignored.
835 # no warnings qw(exiting); last;
836 # if the answer is no longer wanted.
838 my ($anchor, $breakwater);
839 $breakwater = $head if $claimed_bw;
843 $fatal //= sub { fail $_[1]; };
845 my ($cb, $tagsfx, $mainwhy, $xwhy) = @_;
846 my $why = $mainwhy.$xwhy;
847 my $m = "branch needs laundering (run git-debrebase): $why";
848 fail $m unless defined $cb;
850 $cb->("unclean-$tagsfx", $why, $cl, $mainwhy);
852 my $found_anchor = sub {
854 $breakwater //= $clogonly;
855 $breakwater //= $head;
856 no warnings qw(exiting);
860 $cl = classify $head;
861 my $ty = $cl->{Type};
862 if ($ty eq 'Packaging') {
863 $breakwater //= $clogonly;
864 $breakwater //= $head;
865 } elsif ($ty eq 'Changelog') {
866 # this is going to count as the tip of the breakwater
867 # only if it has no upstream stuff before it
869 } elsif ($ty eq 'Anchor' or
870 $ty eq 'TreatAsAnchor' or
871 $ty eq 'BreakwaterStart') {
872 $found_anchor->($head);
873 } elsif ($ty eq 'Upstream') {
874 $x->($unclean, 'ordering',
875 "packaging change ($breakwater) follows upstream change"," (eg $head)")
876 if defined $breakwater;
879 } elsif ($ty eq 'Mixed') {
880 $x->($unclean, 'mixed',
881 "found mixed upstream/packaging commit"," ($head)");
884 } elsif ($ty eq 'Pseudomerge' or
885 $ty eq 'AddPatches') {
887 $x->($furniture, (lc $ty),
888 "found interchange bureaucracy commit ($ty)"," ($head)");
889 } elsif ($ty eq 'DgitImportUnpatched') {
891 $x->($trouble, 'dgitimport',
892 "found dgit dsc import"," ($head)");
893 return (undef,undef);
895 $x->($fatal, 'unprocessable',
896 "found bare dgit dsc import with no prior history",
898 return (undef,undef);
900 } elsif ($ty eq 'VanillaMerge') {
901 $x->($trouble, 'vanillamerge',
902 "found vanilla merge"," ($head)");
903 return (undef,undef);
905 $x->($fatal, 'unprocessable',
906 "found unprocessable commit, cannot cope: $cl->{Why}",
908 return (undef,undef);
910 $head = $cl->{Parents}[0]{CommitId};
912 return ($anchor, $breakwater);
918 $nogenerate,$report, $report_lprefix) = @_;
919 # => ($tip, $breakwater_tip, $last_anchor)
920 # (or nothing, if $nogenerate)
922 printdebug "*** WALK $input ".($nogenerate//0)." ".($report//'-')."\n";
923 $report_lprefix //= '';
925 # go through commits backwards
926 # we generate two lists of commits to apply:
927 # breakwater branch and upstream patches
928 my (@brw_cl, @upp_cl, @processed);
935 my ($prose, $info) = @_;
939 $ms .= "\n\n[git-debrebase$info: $prose]\n";
942 my $rewrite_from_here = sub {
944 my $sp_cl = { SpecialMethod => 'StartRewrite' };
946 push @processed, $sp_cl;
951 my $prprdelim = sub { print $report $prdelim if $report; $prdelim=""; };
954 return unless $report;
955 print $report $prdelim, $report_lprefix, @_;
959 my $bomb = sub { # usage: return $bomb->();
960 print $report " Unprocessable" if $report;
961 print $report " ($cl->{Why})" if $report && defined $cl->{Why};
964 return (undef,undef);
966 fail "found unprocessable commit, cannot cope".
967 (defined $cl->{Why} ? "; $cl->{Why}:": ':').
968 " (commit $cur) (d.".
969 (join ' ', map { sprintf "%#x", $_->{Differs} }
970 @{ $cl->{Parents} }).
977 my $build_start = sub {
978 my ($msg, $parent) = @_;
981 no warnings qw(exiting); last;
985 fail "something useful about failed merge attempt @_ xxx".Dumper($cl);
992 my $ty = $cl->{Type};
993 my $st = $cl->{SubType};
994 $prline->("$cl->{CommitId} $cl->{Type}");
995 $found{$ty. ( defined($st) ? "-$st" : '' )}++;
996 push @processed, $cl;
997 my $p0 = @{ $cl->{Parents} }==1 ? $cl->{Parents}[0]{CommitId} : undef;
998 if ($ty eq 'AddPatches') {
1000 $rewrite_from_here->(\@upp_cl);
1002 } elsif ($ty eq 'Packaging' or $ty eq 'Changelog') {
1006 } elsif ($ty eq 'BreakwaterStart') {
1007 $last_anchor = $cur;
1008 $build_start->('FirstPackaging', $cur);
1009 } elsif ($ty eq 'Upstream') {
1013 } elsif ($ty eq 'Mixed') {
1016 my $cls = { %$cl, $xmsg->("split mixed commit: $wh part") };
1019 $queue->(\@brw_cl, "debian");
1020 $queue->(\@upp_cl, "upstream");
1021 $rewrite_from_here->(\@brw_cl);
1024 } elsif ($ty eq 'Pseudomerge') {
1025 my $contrib = $cl->{Contributor}{CommitId};
1026 print $report " Contributor=$contrib" if $report;
1027 push @pseudomerges, $cl;
1028 $rewrite_from_here->(\@upp_cl);
1031 } elsif ($ty eq 'Anchor' or $ty eq 'TreatAsAnchor') {
1032 $last_anchor = $cur;
1033 $build_start->("Anchor", $cur);
1034 } elsif ($ty eq 'DgitImportUnpatched') {
1035 my $pm = $pseudomerges[-1];
1037 # To an extent, this is heuristic. Imports don't have
1038 # a useful history of the debian/ branch. We assume
1039 # that the first pseudomerge after an import has a
1040 # useful history of debian/, and ignore the histories
1041 # from later pseudomerges. Often the first pseudomerge
1042 # will be the dgit import of the upload to the actual
1043 # suite intended by the non-dgit NMUer, and later
1044 # pseudomerges may represent in-archive copies.
1045 my $ovwrs = $pm->{Overwritten};
1046 printf $report " PM=%s \@Overwr:%d",
1047 $pm->{CommitId}, (scalar @$ovwrs)
1050 printdebug "*** WALK BOMB DgitImportUnpatched\n";
1053 my $ovwr = $ovwrs->[0]{CommitId};
1054 printf $report " Overwr=%s", $ovwr if $report;
1055 # This import has a tree which is just like a
1056 # breakwater tree, but it has the wrong history. It
1057 # ought to have the previous breakwater (which the
1058 # pseudomerge overwrote) as an ancestor. That will
1059 # make the history of the debian/ files correct. As
1060 # for the upstream version: either it's the same as
1061 # was ovewritten (ie, same as the previous
1062 # breakwater), in which case that history is precisely
1063 # right; or, otherwise, it was a non-gitish upload of a
1064 # new upstream version. We can tell these apart by
1065 # looking at the tree of the supposed upstream.
1068 SpecialMethod => 'DgitImportDebianUpdate',
1069 $xmsg->("convert dgit import: debian changes")
1072 SpecialMethod => 'DgitImportUpstreamUpdate',
1073 $xmsg->("convert dgit import: upstream update",
1076 $prline->(" Import");
1077 $rewrite_from_here->(\@brw_cl);
1078 $upp_limit //= $#upp_cl; # further, deeper, patches discarded
1082 # Everything is from this import. This kind of import
1083 # is already nearly in valid breakwater format, with the
1084 # patches as commits. Unfortunately it contains
1086 printdebug "*** WALK BOMB bare dgit import\n";
1087 $cl->{Why} = "bare dgit dsc import";
1091 } elsif ($ty eq 'VanillaMerge' or $ty eq 'MergedBreakwaters') {
1092 # User may have merged unstitched branch(es). We will
1093 # have now lost what ffq-prev was then (since the later
1094 # pseudomerge may introduce further changes). The effect
1095 # of resolving such a merge is that we may have to go back
1096 # further in history to find a merge base, since the one
1097 # which was reachable via ffq-prev is no longer findable.
1098 # This is suboptimal, but if it all works we'll have done
1100 # xxx we should warn the user in the docs about this
1104 # We expect to find a dominating anchor amongst the
1105 # inputs' anchors. That will be the new anchor.
1107 # More complicated is finding a merge base for the
1108 # breakwaters. We need a merge base that is a breakwater
1109 # commit. The ancestors of breakwater commits are more
1110 # breakwater commits and possibly upstream commits and the
1111 # ancestors of those upstream. Upstreams might have
1112 # arbitrary ancestors. But any upstream commit U is
1113 # either included in both anchors, in which case the
1114 # earlier anchor is a better merge base than any of U's
1115 # ancestors; or U is not included in the older anchor, in
1116 # which case U is not an ancestor of the vanilla merge at
1117 # all. So no upstream commit, nor any ancestor thereof,
1118 # is a best merge base. As for non-breakwater Debian
1119 # commits: these are never ancestors of any breakwater.
1121 # So any best merge base as found by git-merge-base
1122 # is a suitable breakwater anchor. Usually there will
1125 printdebug "*** MERGE\n";
1127 # xxx avoid calling walk without nogenerate when
1128 # we have a MergedBreakwater; instead call keycommits ?
1130 my @bwbcmd = (@git, qw(merge-base));
1131 my @ibcmd = (@git, qw(merge-base --all));
1132 my $might_be_in_bw = 1;
1134 my $ps = $cl->{Parents};
1136 foreach my $p (@$ps) {
1137 $prline->(" VanillaMerge ".$p->{Ix});
1139 my ($ptip, $pbw, $panchor) =
1140 walk $p->{CommitId}, 0, $report,
1141 $report_lprefix.' ';
1142 $p->{Laundered} = $p->{SeriesTip} = $ptip;
1143 $p->{Breakwater} = $p->{SeriesBase} = $pbw;
1144 $p->{Anchor} = $panchor;
1146 $best_anchor = $panchor if
1147 !defined $best_anchor or
1148 is_fast_fwd $best_anchor, $panchor;
1150 printdebug " MERGE BA best=".($best_anchor//'-').
1154 foreach my $p (@$ps) {
1155 $prline->(" VanillaMerge ".$p->{Ix});
1156 if (!is_fast_fwd $p->{Anchor}, $best_anchor) {
1157 $nomerge->('DivergentAnchor');
1158 } elsif ($p->{Anchor} eq $best_anchor) {
1159 print $report " SameAnchor" if $report;
1161 print $report " SupersededAnchor" if $report;
1163 if ($p->{Breakwater} eq $p->{CommitId}) {
1164 # this parent commit was its own breakwater,
1165 # ie it is part of the breakwater
1166 print $report " Breakwater" if $report;
1168 $might_be_in_bw = 0;
1170 push @bwbcmd, $p->{Breakwater};
1171 push @ibcmd, $p->{CommitId};
1174 if ($ok && $might_be_in_bw) {
1175 $prline->(" VanillaMerge MergedBreakwaters");
1176 $last_anchor = $best_anchor;
1177 $build_start->('MergedBreakwaters', $cur);
1180 $nomerge->("alleged merged-breakwater is not a breakwater")
1181 unless $ty eq 'VanillaMerge';
1183 my $bwb = cmdoutput @bwbcmd;
1185 # OK, now we have a breakwater base, but we need the merge
1186 # base for the interchange branch because we need the delta
1189 # This a the best merge base of our inputs which has the
1190 # breakwater merge base as an ancestor.
1193 grep { is_fast_fwd $bwb, $_ }
1198 or $nomerge->("no suitable interchange merge base");
1200 $prline->(" VanillaMerge Base");
1202 my ($btip, $bbw, $banchor) =
1203 walk $ib, 0, $report, $report_lprefix.' ';
1205 my $ibinfo = { SeriesTip => $btip,
1207 Anchor => $banchor };
1209 or $nomerge->("interchange merge-base ($ib)'s".
1210 " breakwater ($bbw)".
1211 " != breakwaters' merge-base ($bwb)");
1212 grep { $_->{Anchor} eq $ibinfo->{Anchor} } @$ps
1213 or $nomerge->("interchange merge-base ($ib)'s".
1214 " anchor ($ibinfo->{SeriesBase})".
1215 " != any merge input's anchor (".
1216 (join ' ', map { $_->{Anchor} } @$ps).
1220 $cl->{MergeInterchangeBaseInfo} = $ibinfo;
1221 $cl->{MergeBestAnchor} = $best_anchor;
1224 SpecialMethod => 'MergeCreateMergedBreakwaters',
1225 $xmsg->('constructed from vanilla merge',
1226 ' merged-breakwater'),
1230 SpecialMethod => 'MergeMergeSeries',
1232 $build_start->('MergeBreakwaters', $cur);
1234 printdebug "*** WALK BOMB unrecognised\n";
1240 printdebug "*** WALK prep done cur=$cur".
1241 " brw $#brw_cl upp $#upp_cl proc $#processed pm $#pseudomerges\n";
1243 return if $nogenerate;
1245 # Now we build it back up again
1251 $#upp_cl = $upp_limit if defined $upp_limit;
1253 my $committer_authline = calculate_committer_authline();
1255 printdebug "WALK REBUILD $build ".(scalar @processed)."\n";
1257 confess "internal error" unless $build eq (pop @processed)->{CommitId};
1260 mkdir $rd or $!==EEXIST or die $!;
1262 runcmd @git, qw(read-tree), $build;
1263 foreach my $cl (qw(Debian), (reverse @brw_cl),
1264 { SpecialMethod => 'RecordBreakwaterTip' },
1265 qw(Upstream), (reverse @upp_cl)) {
1267 $current_method = $cl;
1270 my $method = $cl->{SpecialMethod} // $current_method;
1271 my @parents = ($build);
1272 my $cltree = $cl->{CommitId};
1273 printdebug "WALK BUILD ".($cltree//'undef').
1274 " $method (rewriting=$rewriting)\n";
1275 if ($method eq 'Debian') {
1276 read_tree_debian($cltree);
1277 } elsif ($method eq 'Upstream') {
1278 read_tree_upstream($cltree);
1279 } elsif ($method eq 'StartRewrite') {
1282 } elsif ($method eq 'RecordBreakwaterTip') {
1283 $breakwater = $build;
1285 } elsif ($method eq 'DgitImportDebianUpdate') {
1286 read_tree_debian($cltree);
1287 } elsif ($method eq 'DgitImportUpstreamUpdate') {
1288 confess unless $rewriting;
1289 my $differs = (get_differs $build, $cltree);
1290 next unless $differs & D_UPS;
1291 read_tree_upstream($cltree);
1292 push @parents, map { $_->{CommitId} } @{ $cl->{OrigParents} };
1293 } elsif ($method eq 'MergeCreateMergedBreakwaters') {
1294 print "Found a general merge, will try to tidy it up.\n";
1296 read_tree_upstream($cl->{MergeBestAnchor});
1297 read_tree_upstream($cl->{MergeBestAnchor});
1298 read_tree_debian($cltree);
1299 @parents = map { $_->{Breakwater} } @{ $cl->{Parents} };
1300 } elsif ($method eq 'MergeMergeSeries') {
1301 print "Running merge resolution for $cl->{CommitId}...\n";
1302 $build = merge_series
1304 $cl->{MergeInterchangeBaseInfo},
1305 @{ $cl->{Parents} };
1306 $last_anchor = $cl->{MergeBestAnchor};
1307 my $check_differs = get_differs $build, $cl->{CommitId};
1308 # Breakwater changes which were in each side of the
1309 # merge should be in MergeCreateMergedBreakwaters
1310 # output. Upstream changes are exactly the result
1311 # of merge_series. So the only difference should
1312 # be potential laundry results.
1314 "merge misresolved: tree is not the same (%s %s d.%#x)",
1315 $cl->{CommitId}, $build, $check_differs)
1316 if $check_differs & ~D_PAT_ADD;
1317 print "Merge resolution successful.\n";
1320 confess "$method ?";
1323 my $procd = (pop @processed) // 'UNDEF';
1324 if ($cl ne $procd) {
1326 printdebug "WALK REWRITING NOW cl=$cl procd=$procd\n";
1329 my $newtree = cmdoutput @git, qw(write-tree);
1330 my $ch = $cl->{Hdr};
1331 $ch =~ s{^tree .*}{tree $newtree}m or confess "$ch ?";
1332 $ch =~ s{^parent .*\n}{}mg;
1333 $ch =~ s{(?=^author)}{
1334 join '', map { "parent $_\n" } @parents
1335 }me or confess "$ch ?";
1337 $ch =~ s{^committer .*$}{$committer_authline}m
1340 my $cf = "$rd/m$rewriting";
1341 open CD, ">", $cf or die $!;
1342 print CD $ch, "\n", $cl->{Msg} or die $!;
1344 my @cmd = (@git, qw(hash-object));
1345 push @cmd, qw(-w) if $rewriting;
1346 push @cmd, qw(-t commit), $cf;
1347 my $newcommit = cmdoutput @cmd;
1348 confess "$ch ?" unless $rewriting or $newcommit eq $cl->{CommitId};
1349 $build = $newcommit;
1350 if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
1351 $last_anchor = $cur;
1356 my $final_check = get_differs $build, $input;
1357 die sprintf "internal error %#x %s %s", $final_check, $input, $build
1358 if $final_check & ~D_PAT_ADD;
1360 my @r = ($build, $breakwater, $last_anchor);
1361 printdebug "*** WALK RETURN @r\n";
1366 git_check_unmodified();
1367 return git_rev_parse qw(HEAD);
1370 sub update_head ($$$) {
1371 my ($old, $new, $mrest) = @_;
1372 push @deferred_updates, "update HEAD $new $old";
1373 run_deferred_updates $mrest;
1376 sub update_head_checkout ($$$) {
1377 my ($old, $new, $mrest) = @_;
1378 update_head $old, $new, $mrest;
1379 runcmd @git, qw(reset --hard);
1382 sub update_head_postlaunder ($$$) {
1383 my ($old, $tip, $reflogmsg) = @_;
1384 return if $tip eq $old;
1385 print "git-debrebase: laundered (head was $old)\n";
1386 update_head $old, $tip, $reflogmsg;
1387 # no tree changes except debian/patches
1388 runcmd @git, qw(rm --quiet --ignore-unmatch -rf debian/patches);
1391 sub currently_rebasing() {
1392 foreach (qw(rebase-merge rebase-apply)) {
1393 return 1 if stat_exists "$maindir_gitdir/$_";
1398 sub bail_if_rebasing() {
1399 fail "you are in the middle of a git-rebase already"
1400 if currently_rebasing();
1403 sub do_launder_head ($) {
1404 my ($reflogmsg) = @_;
1405 my $old = get_head();
1407 my ($tip,$breakwater) = walk $old;
1409 update_head_postlaunder $old, $tip, $reflogmsg;
1410 return ($tip,$breakwater);
1413 sub cmd_launder_v0 () {
1414 badusage "no arguments to launder-v0 allowed" if @ARGV;
1415 my $old = get_head();
1416 my ($tip,$breakwater,$last_anchor) = walk $old;
1417 update_head_postlaunder $old, $tip, 'launder';
1418 printf "# breakwater tip\n%s\n", $breakwater;
1419 printf "# working tip\n%s\n", $tip;
1420 printf "# last anchor\n%s\n", $last_anchor;
1423 sub defaultcmd_rebase () {
1424 push @ARGV, @{ $opt_defaultcmd_interactive // [] };
1425 my ($tip,$breakwater) = do_launder_head 'launder for rebase';
1426 runcmd @git, qw(rebase), @ARGV, $breakwater if @ARGV;
1429 sub cmd_analyse () {
1430 badusage "analyse does not support any options"
1431 if @ARGV and $ARGV[0] =~ m/^-/;
1432 badusage "too many arguments to analyse" if @ARGV>1;
1435 $old = git_rev_parse $old;
1437 $old = git_rev_parse 'HEAD';
1439 my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
1440 STDOUT->error and die $!;
1443 sub ffq_prev_branchinfo () {
1444 my $current = git_get_symref();
1445 return gdr_ffq_prev_branchinfo($current);
1448 sub ffq_check ($;$$) {
1449 # calls $ff and/or $notff zero or more times
1450 # then returns either (status,message) where status is
1455 # or (undef,undef, $ffq_prev,$gdrlast)
1456 # $ff and $notff are called like this:
1457 # $ff->("message for stdout\n");
1458 # $notff->('snag-name', $message);
1459 # normally $currentval should be HEAD
1460 my ($currentval, $ff, $notff) =@_;
1462 $ff //= sub { print $_[0] or die $!; };
1465 my ($status, $message, $current, $ffq_prev, $gdrlast)
1466 = ffq_prev_branchinfo();
1467 return ($status, $message) unless $status eq 'branch';
1469 my $exists = git_get_ref $ffq_prev;
1470 return ('exists',"$ffq_prev already exists") if $exists;
1472 return ('not-branch', 'HEAD symref is not to refs/heads/')
1473 unless $current =~ m{^refs/heads/};
1476 my @check_specs = split /\;/, (cfg "branch.$branch.ffq-ffrefs",1) // '*';
1479 printdebug "ffq check_specs @check_specs\n";
1482 my ($lrref, $desc) = @_;
1483 printdebug "ffq might check $lrref ($desc)\n";
1485 for my $chk (@check_specs) {
1487 $invert = $glob =~ s{^[!^]}{};
1488 last if fnmatch $glob, $lrref;
1491 my $lrval = git_get_ref $lrref;
1492 return unless length $lrval;
1494 if (is_fast_fwd $lrval, $currentval) {
1495 $ff->("OK, you are ahead of $lrref\n");
1496 $checked{$lrref} = 1;
1497 } elsif (is_fast_fwd $currentval, $lrval) {
1498 $checked{$lrref} = -1;
1499 $notff->('behind', "you are behind $lrref, divergence risk");
1501 $checked{$lrref} = -1;
1502 $notff->('diverged', "you have diverged from $lrref");
1506 my $merge = cfg "branch.$branch.merge",1;
1507 if (defined $merge and $merge =~ m{^refs/heads/}) {
1509 printdebug "ffq merge $rhs\n";
1510 my $check_remote = sub {
1511 my ($remote, $desc) = @_;
1512 printdebug "ffq check_remote ".($remote//'undef')." $desc\n";
1513 return unless defined $remote;
1514 $check->("refs/remotes/$remote/$rhs", $desc);
1516 $check_remote->((scalar cfg "branch.$branch.remote",1),
1517 'remote fetch/merge branch');
1518 $check_remote->((scalar cfg "branch.$branch.pushRemote",1) //
1519 (scalar cfg "branch.$branch.pushDefault",1),
1520 'remote push branch');
1522 if ($branch =~ m{^dgit/}) {
1523 $check->("refs/remotes/dgit/$branch", 'remote dgit branch');
1524 } elsif ($branch =~ m{^master$}) {
1525 $check->("refs/remotes/dgit/dgit/sid", 'remote dgit branch for sid');
1527 return (undef, undef, $ffq_prev, $gdrlast);
1530 sub record_ffq_prev_deferred () {
1531 # => ('status', "message")
1533 # deferred message is undef
1538 # if not ff from some branch we should be ff from, is an snag
1539 # if "deferred", will have added something about that to
1540 # @deferred_update_messages, and also maybe printed (already)
1541 # some messages about ff checks
1543 my $currentval = get_head();
1545 my ($status,$message, $ffq_prev,$gdrlast) = ffq_check $currentval;
1546 return ($status,$message) if defined $status;
1550 push @deferred_updates, "update $ffq_prev $currentval $git_null_obj";
1551 push @deferred_updates, "delete $gdrlast";
1552 push @deferred_update_messages, "Recorded previous head for preservation";
1553 return ('deferred', undef);
1556 sub record_ffq_auto () {
1557 my ($status, $message) = record_ffq_prev_deferred();
1558 if ($status eq 'deferred' || $status eq 'exists') {
1560 snag $status, "could not record ffq-prev: $message";
1565 sub ffq_prev_info () {
1567 # => ($ffq_prev, $gdrlast, $ffq_prev_commitish)
1568 my ($status, $message, $current, $ffq_prev, $gdrlast)
1569 = ffq_prev_branchinfo();
1570 if ($status ne 'branch') {
1571 snag $status, "could not check ffq-prev: $message";
1574 my $ffq_prev_commitish = $ffq_prev && git_get_ref $ffq_prev;
1575 return ($ffq_prev, $gdrlast, $ffq_prev_commitish);
1578 sub stitch ($$$$$) {
1579 my ($old_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose) = @_;
1581 push @deferred_updates, "delete $ffq_prev $ffq_prev_commitish";
1583 if (is_fast_fwd $old_head, $ffq_prev_commitish) {
1584 my $differs = get_differs $old_head, $ffq_prev_commitish;
1585 unless ($differs & ~D_PAT_ADD) {
1586 # ffq-prev is ahead of us, and the only tree changes it has
1587 # are possibly addition of things in debian/patches/.
1588 # Just wind forwards rather than making a pointless pseudomerge.
1589 push @deferred_updates,
1590 "update $gdrlast $ffq_prev_commitish $git_null_obj";
1591 update_head_checkout $old_head, $ffq_prev_commitish,
1592 "stitch (fast forward)";
1597 # We make pseudomerges with L as the contributing parent.
1598 # This makes git rev-list --first-parent work properly.
1599 my $new_head = make_commit [ $old_head, $ffq_prev ], [
1600 'Declare fast forward / record previous work',
1601 "[git-debrebase pseudomerge: $prose]",
1603 push @deferred_updates, "update $gdrlast $new_head $git_null_obj";
1604 update_head $old_head, $new_head, "stitch: $prose";
1607 sub do_stitch ($;$) {
1608 my ($prose, $unclean) = @_;
1610 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
1611 if (!$ffq_prev_commitish) {
1612 fail "No ffq-prev to stitch." unless $opt_noop_ok;
1615 my $dangling_head = get_head();
1617 keycommits $dangling_head, $unclean,$unclean,$unclean;
1620 stitch($dangling_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose);
1623 sub upstream_commitish_search ($$) {
1624 my ($upstream_version, $tried) = @_;
1625 # todo: at some point maybe use git-deborig to do this
1626 foreach my $tagpfx ('', 'v', 'upstream/') {
1627 my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
1628 my $new_upstream = git_get_ref "refs/tags/$tag";
1630 return $new_upstream if length $new_upstream;
1634 sub resolve_upstream_version ($$) {
1635 my ($new_upstream, $upstream_version) = @_;
1637 if (!defined $new_upstream) {
1639 $new_upstream = upstream_commitish_search $upstream_version, \@tried;
1640 if (!length $new_upstream) {
1641 fail "Could not determine appropriate upstream commitish.\n".
1642 " (Tried these tags: @tried)\n".
1643 " Check version, and specify upstream commitish explicitly.";
1646 $new_upstream = git_rev_parse $new_upstream;
1648 return $new_upstream;
1651 sub cmd_new_upstream () {
1652 # automatically and unconditionally launders before rebasing
1653 # if rebase --abort is used, laundering has still been done
1657 badusage "need NEW-VERSION [UPS-COMMITTISH]" unless @ARGV >= 1;
1659 # parse args - low commitment
1660 my $spec_version = shift @ARGV;
1661 my $new_version = (new Dpkg::Version $spec_version, check => 1);
1662 fail "bad version number \`$spec_version'" unless defined $new_version;
1663 if ($new_version->is_native()) {
1664 $new_version = (new Dpkg::Version "$spec_version-1", check => 1);
1667 my $new_upstream = shift @ARGV;
1668 my $new_upstream_version = upstreamversion $new_version;
1670 resolve_upstream_version $new_upstream, $new_upstream_version;
1675 my ($n, @x) = @_; # may be ''
1676 my $pc = $pieces{$n} //= {
1678 Desc => ($n ? "upstream piece \`$n'" : "upstream (main piece"),
1680 while (my $k = shift @x) { $pc->{$k} = shift @x; }
1685 my $newpiece = sub {
1686 my ($n, @x) = @_; # may be ''
1687 my $pc = $piece->($n, @x, NewIx => (scalar @newpieces));
1688 push @newpieces, $pc;
1693 New => $new_upstream,
1695 while (@ARGV && $ARGV[0] !~ m{^-}) {
1696 my $n = shift @ARGV;
1698 badusage "for each EXTRA-UPS-NAME need EXTRA-UPS-COMMITISH"
1699 unless @ARGV && $ARGV[0] !~ m{^-};
1701 my $c = git_rev_parse shift @ARGV;
1702 die unless $n =~ m/^$extra_orig_namepart_re$/;
1703 $newpiece->($n, New => $c);
1706 # now we need to investigate the branch this generates the
1707 # laundered version but we don't switch to it yet
1708 my $old_head = get_head();
1709 my ($old_laundered_tip,$old_bw,$old_anchor) = walk $old_head;
1711 my $old_bw_cl = classify $old_bw;
1712 my $old_anchor_cl = classify $old_anchor;
1714 if (!$old_anchor_cl->{OrigParents}) {
1715 snag 'anchor-treated',
1716 'old anchor is recognised due to --anchor, cannot check upstream';
1718 $old_upstream = parsecommit
1719 $old_anchor_cl->{OrigParents}[0]{CommitId};
1720 $piece->('', Old => $old_upstream->{CommitId});
1723 if ($old_upstream && $old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
1724 if ($old_upstream->{Msg} =~
1725 m{^\[git-debrebase upstream-combine (\.(?: $extra_orig_namepart_re)+)\:.*\]$}m
1727 my @oldpieces = (split / /, $1);
1728 my $old_n_parents = scalar @{ $old_upstream->{Parents} };
1729 if ($old_n_parents != @oldpieces &&
1730 $old_n_parents != @oldpieces + 1) {
1731 snag 'upstream-confusing', sprintf
1732 "previous upstream combine %s".
1733 " mentions %d pieces (each implying one parent)".
1734 " but has %d parents".
1735 " (one per piece plus maybe a previous combine)",
1736 $old_upstream->{CommitId},
1737 (scalar @oldpieces),
1739 } elsif ($oldpieces[0] ne '.') {
1740 snag 'upstream-confusing', sprintf
1741 "previous upstream combine %s".
1742 " first piece is not \`.'",
1746 foreach my $i (0..$#oldpieces) {
1747 my $n = $oldpieces[$i];
1748 my $hat = 1 + $i + ($old_n_parents - @oldpieces);
1749 $piece->($n, Old => $old_upstream->{CommitId}.'^'.$hat);
1753 snag 'upstream-confusing',
1754 "previous upstream $old_upstream->{CommitId} is from".
1755 " git-debrebase but not an \`upstream-combine' commit";
1759 foreach my $pc (values %pieces) {
1760 if (!$old_upstream) {
1761 # we have complained already
1762 } elsif (!$pc->{Old}) {
1763 snag 'upstream-new-piece',
1764 "introducing upstream piece \`$pc->{Name}'";
1765 } elsif (!$pc->{New}) {
1766 snag 'upstream-rm-piece',
1767 "dropping upstream piece \`$pc->{Name}'";
1768 } elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
1769 snag 'upstream-not-ff',
1770 "not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}";
1774 printdebug "%pieces = ", (dd \%pieces), "\n";
1775 printdebug "\@newpieces = ", (dd \@newpieces), "\n";
1783 my @upstream_merge_parents;
1786 push @upstream_merge_parents, $old_upstream->{CommitId};
1789 foreach my $pc (@newpieces) { # always has '' first
1791 read_tree_subdir $pc->{Name}, $pc->{New};
1793 runcmd @git, qw(read-tree), $pc->{New};
1795 push @upstream_merge_parents, $pc->{New};
1798 # index now contains the new upstream
1800 if (@newpieces > 1) {
1801 # need to make the upstream subtree merge commit
1802 $new_upstream = make_commit \@upstream_merge_parents,
1803 [ "Combine upstreams for $new_upstream_version",
1804 ("[git-debrebase upstream-combine . ".
1805 (join " ", map { $_->{Name} } @newpieces[1..$#newpieces]).
1810 # $new_upstream is either the single upstream commit, or the
1811 # combined commit we just made. Either way it will be the
1812 # "upstream" parent of the anchor merge.
1814 read_tree_subdir 'debian', "$old_bw:debian";
1816 # index now contains the anchor merge contents
1817 $new_bw = make_commit [ $old_bw, $new_upstream ],
1818 [ "Update to upstream $new_upstream_version",
1819 "[git-debrebase anchor: new upstream $new_upstream_version, merge]",
1822 my $clogsignoff = cmdoutput qw(git show),
1823 '--pretty=format:%an <%ae> %aD',
1826 # Now we have to add a changelog stanza so the Debian version
1828 die if unlink "debian";
1829 die $! unless $!==ENOENT or $!==ENOTEMPTY;
1830 unlink "debian/changelog" or $!==ENOENT or die $!;
1831 mkdir "debian" or die $!;
1832 open CN, ">", "debian/changelog" or die $!;
1833 my $oldclog = git_cat_file ":debian/changelog";
1834 $oldclog =~ m/^($package_re) \(\S+\) / or
1835 fail "cannot parse old changelog to get package name";
1837 print CN <<END, $oldclog or die $!;
1838 $p ($new_version) UNRELEASED; urgency=medium
1840 * Update to new upstream version $new_upstream_version.
1846 runcmd @git, qw(update-index --add --replace), 'debian/changelog';
1848 # Now we have the final new breakwater branch in the index
1849 $new_bw = make_commit [ $new_bw ],
1850 [ "Update changelog for new upstream $new_upstream_version",
1851 "[git-debrebase: new upstream $new_upstream_version, changelog]",
1855 # we have constructed the new breakwater. we now need to commit to
1856 # the laundering output, because git-rebase can't easily be made
1857 # to make a replay list which is based on some other branch
1859 update_head_postlaunder $old_head, $old_laundered_tip,
1860 'launder for new upstream';
1862 my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw, @ARGV);
1863 local $ENV{GIT_REFLOG_ACTION} = git_reflog_action_msg
1864 "debrebase new-upstream $new_version: rebase";
1866 # now it's for the user to sort out
1869 sub cmd_record_ffq_prev () {
1870 badusage "no arguments allowed" if @ARGV;
1871 my ($status, $msg) = record_ffq_prev_deferred();
1872 if ($status eq 'exists' && $opt_noop_ok) {
1873 print "Previous head already recorded\n" or die $!;
1874 } elsif ($status eq 'deferred') {
1875 run_deferred_updates 'record-ffq-prev';
1877 fail "Could not preserve: $msg";
1882 badusage "no arguments allowed" if @ARGV;
1883 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
1884 print "$bw\n" or die $!;
1887 sub cmd_breakwater () {
1888 badusage "no arguments allowed" if @ARGV;
1889 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
1890 print "$bw\n" or die $!;
1894 badusage "no arguments allowed" if @ARGV;
1896 # todo: gdr status should print divergence info
1897 # todo: gdr status should print upstream component(s) info
1898 # todo: gdr should leave/maintain some refs with this kind of info ?
1900 my $oldest = { Badness => 0 };
1903 my ($badness, $ourmsg, $snagname, $dummy, $cl, $kcmsg) = @_;
1904 if ($oldest->{Badness} < $badness) {
1905 $oldest = $newest = undef;
1908 Badness => $badness,
1909 CommitId => $cl->{CommitId},
1913 $newest //= $oldest;
1915 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'),
1916 sub { $note->(1, 'branch contains furniture (not laundered)', @_); },
1917 sub { $note->(2, 'branch is unlaundered', @_); },
1918 sub { $note->(3, 'branch needs laundering', @_); },
1919 sub { $note->(4, 'branch not in git-debrebase form', @_); };
1921 my $prcommitinfo = sub {
1923 flush STDOUT or die $!;
1924 runcmd @git, qw(--no-pager log -n1),
1925 '--pretty=format: %h %s%n',
1929 print "current branch contents, in git-debrebase terms:\n";
1930 if (!$oldest->{Badness}) {
1931 print " branch is laundered\n";
1933 print " $oldest->{OurMsg}\n";
1935 foreach my $info ($oldest, $newest) {
1936 my $cid = $info->{CommitId};
1937 next if $cid eq $printed;
1939 print " $info->{KcMsg}\n";
1940 $prcommitinfo->($cid);
1945 my ($cid, $what) = @_;
1946 if (!defined $cid) {
1947 print " $what is not well-defined\n";
1950 $prcommitinfo->($cid);
1953 print "key git-debrebase commits:\n";
1954 $prab->($anchor, 'anchor');
1955 $prab->($bw, 'breakwater');
1957 my ($ffqstatus, $ffq_msg, $current, $ffq_prev, $gdrlast) =
1958 ffq_prev_branchinfo();
1960 print "branch and ref status, in git-debrebase terms:\n";
1962 print " $ffq_msg\n";
1964 $ffq_prev = git_get_ref $ffq_prev;
1965 $gdrlast = git_get_ref $gdrlast;
1967 print " unstitched; previous tip was:\n";
1968 $prcommitinfo->($ffq_prev);
1969 } elsif (!$gdrlast) {
1970 print " stitched? (no record of git-debrebase work)\n";
1971 } elsif (is_fast_fwd $gdrlast, 'HEAD') {
1972 print " stitched\n";
1974 print " not git-debrebase (diverged since last stitch)\n"
1977 print "you are currently rebasing\n" if currently_rebasing();
1981 my $prose = 'stitch';
1982 getoptions("stitch",
1983 'prose=s', \$prose);
1984 badusage "no arguments allowed" if @ARGV;
1985 do_stitch $prose, 0;
1987 sub cmd_prepush () { cmd_stitch(); }
1990 badusage "no arguments allowed" if @ARGV;
1991 do_launder_head 'launder for git-debrebase quick';
1995 sub cmd_conclude () {
1996 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
1997 if (!$ffq_prev_commitish) {
1998 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2001 my $dangling_head = get_head();
2003 badusage "no arguments allowed" if @ARGV;
2004 do_launder_head 'launder for git-debrebase quick';
2009 if (currently_rebasing()) {
2010 runcmd @git, qw(rebase --abort);
2012 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
2013 if (!$ffq_prev_commitish) {
2014 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2017 my $scrapping_head = get_head();
2018 badusage "no arguments allowed" if @ARGV;
2019 push @deferred_updates,
2020 "update $gdrlast $ffq_prev_commitish $git_null_obj",
2021 "update $ffq_prev $git_null_obj $ffq_prev_commitish";
2023 update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
2026 sub make_patches_staged ($) {
2028 # Produces the patches that would result from $head if it were
2030 my ($secret_head, $secret_bw, $last_anchor) = walk $head;
2033 gbp_pq_export 'bw', $secret_bw, $secret_head;
2037 sub make_patches ($) {
2039 keycommits $head, 0, \&snag;
2040 make_patches_staged $head;
2043 my $ptree = cmdoutput @git, qw(write-tree --prefix=debian/patches/);
2044 runcmd @git, qw(read-tree), $head;
2045 read_tree_subdir 'debian/patches', $ptree;
2046 $out = make_commit [$head], [
2047 'Commit patch queue (exported by git-debrebase)',
2048 '[git-debrebase: export and commit patches]',
2054 sub cmd_make_patches () {
2055 my $opt_quiet_would_amend;
2056 getoptions("make-patches",
2057 'quiet-would-amend!', \$opt_quiet_would_amend);
2058 badusage "no arguments allowed" if @ARGV;
2060 my $old_head = get_head();
2061 my $new = make_patches $old_head;
2062 my $d = get_differs $old_head, $new;
2064 fail "No (more) patches to export." unless $opt_noop_ok;
2066 } elsif ($d == D_PAT_ADD) {
2068 update_head_checkout $old_head, $new, 'make-patches';
2070 print STDERR failmsg
2071 "Patch export produced patch amendments".
2072 " (abandoned output commit $new).".
2073 " Try laundering first."
2074 unless $opt_quiet_would_amend;
2079 sub cmd_convert_from_gbp () {
2080 badusage "want only 1 optional argument, the upstream git commitish"
2083 my $clogp = parsechangelog();
2084 my $version = $clogp->{'Version'}
2085 // die "missing Version from changelog";
2087 my ($upstream_spec) = @ARGV;
2089 my $upstream_version = upstreamversion $version;
2091 resolve_upstream_version($upstream_spec, $upstream_version);
2093 my $old_head = get_head();
2095 my $upsdiff = get_differs $upstream, $old_head;
2096 if ($upsdiff & D_UPS) {
2097 runcmd @git, qw(--no-pager diff --stat),
2098 $upstream, $old_head,
2099 qw( -- :!/debian :/);
2101 upstream ($upstream_spec) and HEAD are not
2102 identical in upstream files. See diffstat above, or run
2103 git diff $upstream_spec HEAD -- :!/debian :/
2107 if (!is_fast_fwd $upstream, $old_head) {
2108 snag 'upstream-not-ancestor',
2109 "upstream ($upstream) is not an ancestor of HEAD";
2111 my $wrong = cmdoutput
2112 (@git, qw(rev-list --ancestry-path), "$upstream..HEAD",
2113 qw(-- :/ :!/debian));
2114 if (length $wrong) {
2115 snag 'unexpected-upstream-changes',
2116 "history between upstream ($upstream) and HEAD contains direct changes to upstream files - are you sure this is a gbp (patches-unapplied) branch?";
2117 print STDERR "list expected changes with: git log --stat --ancestry-path $upstream_spec..HEAD -- :/ ':!/debian'\n";
2121 if ((git_cat_file "$upstream:debian")[0] ne 'missing') {
2122 snag 'upstream-has-debian',
2123 "upstream ($upstream) contains debian/ directory";
2126 my $previous_dgit_view = eval {
2127 my @clogcmd = qw(dpkg-parsechangelog --format rfc822 -n2);
2129 parsechangelog_loop \@clogcmd, 'debian/changelog', sub {
2130 my ($stz, $desc) = @_;
2131 no warnings qw(exiting);
2132 printdebug 'CHANGELOG ', Dumper($desc, $stz);
2133 next unless $stz->{Date};
2134 next unless $stz->{Distribution} ne 'UNRELEASED';
2135 $lvsn = $stz->{Version};
2136 $suite = $stz->{Distribution};
2139 die "neither of the first two changelog entries are released\n"
2140 unless defined $lvsn;
2141 print "last finished-looking changelog entry: ($lvsn) $suite\n";
2142 my $mtag_pat = debiantag_maintview $lvsn, '*';
2143 my $mtag = cmdoutput @git, qw(describe --always --abbrev=0 --match),
2145 die "could not find suitable maintainer view tag $mtag_pat\n"
2146 unless $mtag_pat =~ m{/};
2147 is_fast_fwd $mtag, 'HEAD' or
2148 die "HEAD is not FF from maintainer tag $mtag!";
2149 my $dtag = "archive/$mtag";
2150 is_fast_fwd $mtag, $dtag or
2151 die "dgit view tag $dtag is not FF from maintainer tag $mtag";
2152 print "will stitch in dgit view, $dtag\n";
2153 git_rev_parse $dtag;
2155 if (!$previous_dgit_view) {
2158 print STDERR "cannot stitch in dgit view: $@\n";
2161 snags_maybe_bail_early();
2167 runcmd @git, qw(checkout -q -b gdr-internal), $old_head;
2168 # make a branch out of the patch queue - we'll want this in a mo
2169 runcmd qw(gbp pq import);
2170 # strip the patches out
2171 runcmd @git, qw(checkout -q gdr-internal~0);
2172 rm_subdir_cached 'debian/patches';
2173 $work = make_commit ['HEAD'], [
2174 'git-debrebase convert-from-gbp: drop patches from tree',
2175 'Delete debian/patches, as part of converting to git-debrebase format.',
2176 '[git-debrebase convert-from-gbp: drop patches from tree]'
2178 # make the anchor merge
2179 # the tree is already exactly right
2180 $work = make_commit [$work, $upstream], [
2181 'git-debrebase import: declare upstream',
2182 'First breakwater merge.',
2183 '[git-debrebase anchor: declare upstream]'
2186 # rebase the patch queue onto the new breakwater
2187 runcmd @git, qw(reset --quiet --hard patch-queue/gdr-internal);
2188 runcmd @git, qw(rebase --quiet --onto), $work, qw(gdr-internal);
2189 $work = git_rev_parse 'HEAD';
2191 if ($previous_dgit_view) {
2192 $work = make_commit [$work, $previous_dgit_view], [
2193 'git-debrebase import: declare ff from dgit archive view',
2194 '[git-debrebase pseudomerge: import-from-gbp]',
2201 update_head_checkout $old_head, $work, 'convert-from-gbp';
2204 sub cmd_convert_to_gbp () {
2205 badusage "no arguments allowed" if @ARGV;
2206 my $head = get_head();
2207 my (undef, undef, undef, $ffq, $gdrlast) = ffq_prev_branchinfo();
2208 keycommits $head, 0;
2210 make_patches_staged $head;
2212 $out = make_commit ['HEAD'], [
2213 'Commit patch queue (converted from git-debrebase format)',
2214 '[git-debrebase convert-to-gbp: commit patches]',
2218 push @deferred_updates, "delete $ffq";
2219 push @deferred_updates, "delete $gdrlast";
2222 update_head_checkout $head, $out, "convert to gbp (v0)";
2223 print <<END or die $!;
2224 git-debrebase: converted to git-buildpackage branch format
2225 git-debrebase: WARNING: do not now run "git-debrebase" any more
2226 git-debrebase: WARNING: doing so would drop all upstream patches!
2230 sub cmd_convert_from_dgit_view () {
2231 my $clogp = parsechangelog();
2233 my $bpd = (cfg 'dgit.default.build-products-dir',1) // '..';
2239 getoptions("convert-from-dgit-view",
2240 'diagnose!', \$diagnose,
2241 'build-products-dir:s', \$bpd,
2242 'origs!', \$do_origs,
2244 'always-convert-anyway!', \$always);
2245 fail "takes 1 optional argument, the upstream commitish" if @ARGV>1;
2250 my $spec = shift @ARGV;
2251 my $commit = git_rev_parse "$spec^{commit}";
2252 push @upstreams, { Commit => $commit,
2253 Source => "$ARGV[0], from command line",
2258 my $head = get_head();
2262 my $trouble = sub { $troubles++; };
2263 keycommits $head, sub{}, sub{}, $trouble, $trouble;
2264 printdebug "troubles=$troubles\n";
2267 $us: Branch already seems to be in git-debrebase format!
2268 $us: --always-convert-anyway would do the conversion operation anyway
2269 $us: but is probably a bad idea. Probably, you wanted to do nothing.
2271 fail "Branch already in git-debrebase format." unless $opt_noop_ok;
2276 snags_maybe_bail_early();
2278 my $version = upstreamversion $clogp->{Version};
2279 print STDERR "Considering possible commits corresponding to upstream:\n";
2284 my $ups_tag = upstream_commitish_search $version, \@tried;
2286 my $this = "git tag $tried[-1]";
2287 push @upstreams, { Commit => $ups_tag,
2292 " git tag: no suitable tag found (tried %s)\n",
2297 my $p = $clogp->{'Source'};
2298 # we do a quick check to see if there are plausible origs
2300 if (!opendir BPD, $bpd) {
2301 die "$bpd: opendir: $!" unless $!==ENOENT;
2303 while ($!=0, my $f = readdir BPD) {
2304 next unless is_orig_file_of_p_v $f, $p, $version;
2306 " orig: found what looks like a .orig, %s\n",
2311 die "read $bpd: $!" if $!;
2315 my $tree = cmdoutput
2316 @dgit, qw(--build-products-dir), $bpd,
2317 qw(print-unapplied-treeish);
2320 runcmd @git, qw(reset --quiet), $tree, qw(-- .);
2321 rm_subdir_cached 'debian';
2322 $tree = cmdoutput @git, qw(write-tree);
2323 my $ups_synth = make_commit [], [ <<END, <<END,
2324 Import effective orig tree for upstream version $version
2326 This includes the contents of the .orig(s), minus any debian/ directory.
2328 [git-debrebase import-from-dgit-view upstream-import-convert: $version]
2331 push @upstreams, { Commit => $ups_synth,
2332 Source => "orig(s) imported via dgit",
2337 " orig: no suitable origs found (looked for %s in %s)\n",
2338 "${p}_".(stripeoch $version)."...", $bpd;
2343 my $some_patches = stat_exists 'debian/patches/series';
2345 print STDERR "Evaluating possible commits corresponding to upstream:\n";
2348 foreach my $u (@upstreams) {
2352 runcmd @git, qw(reset --quiet), $u->{Commit}, qw(-- .);
2353 runcmd @git, qw(checkout), $u->{Commit}, qw(-- .);
2354 runcmd @git, qw(clean -xdff);
2355 runcmd @git, qw(checkout), $head, qw(-- debian);
2356 if ($some_patches) {
2357 rm_subdir_cached 'debian/patches';
2358 $work = make_commit [ $work ], [
2359 'git-debrebase convert-from-dgit-view: drop upstream changes from breakwater',
2360 "Drop upstream changes, and delete debian/patches, as part of converting\n".
2361 "to git-debrebase format. Upstream changes will appear as commits.",
2362 '[git-debrebase convert-from-dgit-view: drop patches from tree]'
2365 $work = make_commit [ $work, $u->{Commit} ], [
2366 'git-debrebase convert-from-dgit-view: declare upstream',
2367 '(Re)constructed breakwater merge.',
2368 '[git-debrebase anchor: declare upstream]'
2370 runcmd @git, qw(checkout --quiet -b mk), $work;
2371 if ($some_patches) {
2372 runcmd @git, qw(checkout), $head, qw(-- debian/patches);
2373 runcmd @git, qw(reset --quiet);
2374 my @gbp_cmd = (qw(gbp pq import));
2376 my $gbp_err = "../gbp-pq-err";
2377 @gbp_cmd = shell_cmd "exec >$gbp_err 2>&1", @gbp_cmd;
2379 my $r = system @gbp_cmd;
2382 " %s: couldn't apply patches: gbp pq %s",
2383 $u->{Source}, waitstatusmsg();
2387 my $work = git_rev_parse qw(HEAD);
2388 my $diffout = cmdoutput @git, qw(diff-tree --stat HEAD), $work;
2389 if (length $diffout) {
2391 " $u->{Source}: applying patches gives different tree\n";
2392 print STDERR $diffout if $diagnose;
2396 $u->{Result} = $work;
2404 Could not find or construct a suitable upstream commit.
2405 Rerun adding --diagnose after convert-from-dgit-view, or pass a
2406 upstream commmit explicitly or provide suitable origs.
2410 printf STDERR "Yes, will base new branch on %s\n", $result->{Source};
2412 ffq_check $result->{Result};
2414 update_head_checkout $head, $result->{Result},
2415 'convert-from-dgit-view';
2418 sub cmd_downstream_rebase_launder_v0 () {
2419 badusage "needs 1 argument, the baseline" unless @ARGV==1;
2421 $base = git_rev_parse $base;
2422 my $old_head = get_head();
2423 my $current = $old_head;
2426 if ($current eq $base) {
2427 $topmost_keep //= $current;
2428 print " $current BASE stop\n";
2431 my $cl = classify $current;
2432 print " $current $cl->{Type}";
2434 my $p0 = $cl->{Parents}[0]{CommitId};
2436 if ($cl->{Type} eq 'Pseudomerge') {
2437 print " ^".($cl->{Contributor}{Ix}+1);
2438 $next = $cl->{Contributor}{CommitId};
2439 } elsif ($cl->{Type} eq 'AddPatches' or
2440 $cl->{Type} eq 'Changelog') {
2450 $topmost_keep //= $current;
2452 die "to-be stripped changes not on top of the branch\n"
2457 if ($topmost_keep eq $old_head) {
2458 print "unchanged\n";
2460 print "updating to $topmost_keep\n";
2461 update_head_checkout
2462 $old_head, $topmost_keep,
2463 'downstream-rebase-launder-v0';
2469 "D+" => \$debuglevel,
2470 'noop-ok', => \$opt_noop_ok,
2471 'f=s' => \@snag_force_opts,
2472 'anchor=s' => \@opt_anchors,
2473 '--dgit=s' => \($dgit[0]),
2476 my ($opt,$val) = @_;
2477 badusage "git-debrebase: no cuddling to -i for git-rebase"
2479 die if $opt_defaultcmd_interactive; # should not happen
2480 $opt_defaultcmd_interactive = [ qw(-i) ];
2481 # This access to @ARGV is excessive familiarity with
2482 # Getopt::Long, but there isn't another sensible
2483 # approach. '-i=s{0,}' does not work with bundling.
2484 push @$opt_defaultcmd_interactive, @ARGV;
2487 'help' => sub { print $usage_message or die $!; finish 0; },
2490 initdebug('git-debrebase ');
2491 enabledebug if $debuglevel;
2493 my $toplevel = cmdoutput @git, qw(rev-parse --show-toplevel);
2494 chdir $toplevel or die "chdir $toplevel: $!";
2496 $rd = fresh_playground "$playprefix/misc";
2498 @opt_anchors = map { git_rev_parse $_ } @opt_anchors;
2500 if (!@ARGV || $opt_defaultcmd_interactive || $ARGV[0] =~ m{^-}) {
2501 defaultcmd_rebase();
2503 my $cmd = shift @ARGV;
2506 $cmdfn = ${*::}{"cmd_$cmdfn"};
2508 $cmdfn or badusage "unknown git-debrebase sub-operation $cmd";