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_careful, $opt_noop_ok, @opt_anchors);
54 our ($opt_defaultcmd_interactive);
58 our $us = qw(git-debrebase);
60 our $wrecknoteprefix = 'refs/debrebase/wreckage';
61 our $merge_cache_ref = 'refs/debrebase/merge-resolutions';
67 print STDERR "$us: bad usage: $m\n";
73 local $SIG{__WARN__}; # GetOptions calls `warn' to print messages
74 GetOptions @_ or badusage $m;
78 getoptions_main "bad options follow \`git-debrebase $sc'", @_;
82 my ($k, $optional) = @_;
84 my @cmd = qw(git config -z);
85 push @cmd, qw(--get-all) if wantarray;
87 my $out = cmdoutput_errok @cmd;
89 fail "missing required git config $k" unless $optional;
92 my @l = split /\0/, $out;
93 return wantarray ? @l : $l[0];
100 my $dd = new Data::Dumper [ $v ];
101 Terse $dd 1; Indent $dd 0; Useqq $dd 1;
107 my $data = (git_cat_file $objid, 'commit');
108 $data =~ m/(?<=\n)\n/ or die "$objid ($data) ?";
112 sub D_UPS () { 0x02; } # upstream files
113 sub D_PAT_ADD () { 0x04; } # debian/patches/ extra patches at end
114 sub D_PAT_OTH () { 0x08; } # debian/patches other changes
115 sub D_DEB_CLOG () { 0x10; } # debian/changelog
116 sub D_DEB_OTH () { 0x20; } # debian/ (not patches/ or changelog)
117 sub DS_DEB () { D_DEB_CLOG | D_DEB_OTH; } # debian/ (not patches/)
119 our $playprefix = 'debrebase';
124 our @dgit = qw(dgit);
126 sub in_workarea ($) {
129 my $r = eval { $sub->(); };
130 { local $@; changedir $maindir; }
134 sub fresh_workarea (;$) {
137 $workarea = fresh_playground "$playprefix/$subdir";
138 in_workarea sub { playtree_setup };
141 sub run_ref_updates_now ($$) {
142 my ($mrest, $updates) = @_;
143 # @$updates is a list of lines for git-update-ref, without \ns
145 my @upd_cmd = (git_update_ref_cmd "debrebase: $mrest", qw(--stdin));
146 debugcmd '>|', @upd_cmd;
147 open U, "|-", @upd_cmd or die $!;
148 foreach (@$updates) {
149 printdebug ">= ", $_, "\n";
150 print U $_, "\n" or die $!;
153 close U or failedcmd @upd_cmd;
156 our $snags_forced = 0;
157 our $snags_tripped = 0;
158 our $snags_summarised = 0;
159 our @deferred_updates;
160 our @deferred_update_messages;
162 sub merge_wreckage_cleaning ($) {
164 git_for_each_ref("$wrecknoteprefix/*", sub {
165 my ($objid,$objtype,$fullrefname,$reftail) = @_;
166 push @$updates, "delete $fullrefname";
170 sub all_snags_summarised () {
171 $snags_forced + $snags_tripped == $snags_summarised;
173 sub run_deferred_updates ($) {
176 confess 'dangerous internal error' unless all_snags_summarised();
178 merge_wreckage_cleaning \@deferred_updates;
179 run_ref_updates_now $mrest, \@deferred_updates;
180 print $_, "\n" foreach @deferred_update_messages;
182 @deferred_updates = ();
183 @deferred_update_messages = ();
186 sub get_tree ($;$$) {
187 # tree object name => ([ $name, $info ], ...)
188 # where $name is the sort key, ie has / at end for subtrees
189 # $info is the LHS from git-ls-tree (<mode> <type> <hash>)
190 # without $precheck, will crash if $x does not exist, so don't do that;
191 # instead pass '' to get ().
192 my ($x, $precheck, $recurse) = @_;
194 return () if !length $x;
197 my ($type, $dummy) = git_cat_file $x, [qw(tree missing)];
198 return () if $type eq 'missing';
201 our (@get_tree_memo, %get_tree_memo);
202 my $memo = $get_tree_memo{$x};
203 return @$memo if $memo;
205 local $Debian::Dgit::debugcmd_when_debuglevel = 3;
207 my @cmd = (qw(git ls-tree -z --full-tree));
208 push @cmd, qw(-r) if $recurse;
209 push @cmd, qw(--), $x;
210 my $o = cmdoutput @cmd;
213 foreach my $l (split /\0/, $o) {
214 my ($i, $n) = split /\t/, $l, 2;
215 $n .= '/' if $i =~ m/^\d+ tree /;
217 confess "$x need $last < $n ?" unless $last lt $n;
219 $get_tree_memo{$x} = \@l;
220 push @get_tree_memo, $x;
221 if (@get_tree_memo > 10) {
222 delete $get_tree_memo{ shift @get_tree_memo };
227 sub trees_diff_walk ($$$;$) {
228 # trees_diff_walk [$all,] $x, $y, sub {... }
229 # calls sub->($name, $ix, $iy) for each difference (with $all, each name)
230 # $x and $y are as for get_tree
231 # where $name, $ix, $iy are $name and $info from get_tree
232 my $all = shift @_ if @_>=4;
233 my ($x,$y,$call) = @_;
234 return if !$all and $x eq $y;
237 printdebug "trees_diff_walk(..$x,$y..) ".Dumper(\@x,\@y)
240 my $cmp = !@x <=> !@y # eg @y empty? $cmp=-1, use x
241 || $x[0][0] cmp $y[0][0]; # eg, x lt y ? $cmp=-1, use x
242 my ($n, $ix, $iy); # all same? $cmp=0, use both
244 printdebug "trees_diff_walk $cmp : @{ $x[0]//[] } | @{ $y[0]//[] }\n"
246 ($n, $ix) = @{ shift @x } if $cmp <= 0;
247 ($n, $iy) = @{ shift @y } if $cmp >= 0;
248 next if !$all and $ix eq $iy;
250 "trees_diff_walk(%d,'%s','%s') call('%s','%s','%s')\n",
251 !!$all,$x,$y, $n,$ix,$iy
253 $call->($n, $ix, $iy);
257 sub get_differs ($$) {
259 # This does a similar job to quiltify_trees_differ, in dgit, a bit.
260 # But we don't care about modes, or dpkg-source-unrepresentable
261 # changes, and we don't need the plethora of different modes.
262 # Conversely we need to distinguish different kinds of changes to
263 # debian/ and debian/patches/.
264 # Also, here we have, and want to use, trees_diff_walk, because
265 # we may be calling this an awful lot and we want it to be fast.
270 no warnings qw(exiting);
272 my $plain = sub { $_[0] =~ m{^(100|0*)644 blob }s; };
274 trees_diff_walk "$x:", "$y:", sub {
275 my ($n,$ix,$iy) = @_;
277 # analyse difference at the toplevel
279 if ($n ne 'debian/') {
283 if ($n eq 'debian') {
284 # one side has a non-tree for ./debian !
285 $differs |= D_DEB_OTH;
289 my $xd = $ix && "$x:debian";
290 my $yd = $iy && "$y:debian";
291 trees_diff_walk $xd, $yd, sub {
292 my ($n,$ix,$iy) = @_;
294 # analyse difference in debian/
296 if ($n eq 'changelog' && (!$ix || $plain->($ix))
298 $differs |= D_DEB_CLOG;
301 if ($n ne 'patches/') {
302 $differs |= D_DEB_OTH;
306 my $xp = $ix && "$xd/patches";
307 my $yp = $iy && "$yd/patches";
308 trees_diff_walk $xp, $yp, sub {
309 my ($n,$ix,$iy) = @_;
311 # analyse difference in debian/patches
314 if ($n !~ m/\.series$/s && !$ix && $plain->($iy)) {
316 } elsif ($n eq 'series' && $plain->($ix) && $plain->($iy)) {
317 my $x_s = (git_cat_file "$xp/series", 'blob');
318 my $y_s = (git_cat_file "$yp/series", 'blob');
319 chomp $x_s; $x_s .= "\n";
320 $ok = $x_s eq substr($y_s, 0, length $x_s);
324 $differs |= $ok ? D_PAT_ADD : D_PAT_OTH;
329 printdebug sprintf "get_differs %s %s = %#x\n", $x, $y, $differs;
334 sub commit_pr_info ($) {
336 return Data::Dumper->dump([$r], [qw(commit)]);
339 sub calculate_committer_authline () {
340 my $c = cmdoutput @git, qw(commit-tree --no-gpg-sign -m),
341 'DUMMY COMMIT (git-debrebase)', "HEAD:";
342 my ($h,$m) = get_commit $c;
343 $h =~ m/^committer .*$/m or confess "($h) ?";
347 sub rm_subdir_cached ($) {
349 runcmd @git, qw(rm --quiet -rf --cached --ignore-unmatch), $subdir;
352 sub read_tree_subdir ($$) {
353 my ($subdir, $new_tree_object) = @_;
354 rm_subdir_cached $subdir;
355 runcmd @git, qw(read-tree), "--prefix=$subdir/", $new_tree_object;
358 sub read_tree_debian ($) {
360 read_tree_subdir 'debian', "$treeish:debian";
361 rm_subdir_cached 'debian/patches';
364 sub read_tree_upstream ($;$$) {
365 my ($treeish, $keep_patches, $tree_with_debian) = @_;
366 # if $tree_with_debian is supplied, will use that for debian/
367 # otherwise will save and restore it.
369 $tree_with_debian ? "$tree_with_debian:debian"
370 : cmdoutput @git, qw(write-tree --prefix=debian/);
371 runcmd @git, qw(read-tree), $treeish;
372 read_tree_subdir 'debian', $debian;
373 rm_subdir_cached 'debian/patches' unless $keep_patches;
376 sub make_commit ($$) {
377 my ($parents, $message_paras) = @_;
378 my $tree = cmdoutput @git, qw(write-tree);
379 my @cmd = (@git, qw(commit-tree), $tree);
380 push @cmd, qw(-p), $_ foreach @$parents;
381 push @cmd, qw(-m), $_ foreach @$message_paras;
382 return cmdoutput @cmd;
385 our @snag_force_opts;
387 my ($tag,$msg) = @_; # ignores extra args, for benefit of keycommits
388 if (grep { $_ eq $tag } @snag_force_opts) {
390 print STDERR "git-debrebase: snag ignored (-f$tag): $msg\n";
393 print STDERR "git-debrebase: snag detected (-f$tag): $msg\n";
397 # Important: all mainline code must call snags_maybe_bail after
398 # any point where snag might be called, but before making changes
399 # (eg before any call to run_deferred_updates). snags_maybe_bail
400 # may be called more than once if necessary (but this is not ideal
401 # because then the messages about number of snags may be confusing).
402 sub snags_maybe_bail () {
403 return if all_snags_summarised();
406 "%s: snags: %d overriden by individual -f options\n",
409 if ($snags_tripped) {
412 "%s: snags: %d overriden by global --force\n",
416 "%s: snags: %d blocker(s) (you could -f<tag>, or --force)",
420 $snags_summarised = $snags_forced + $snags_tripped;
422 sub snags_maybe_bail_early () {
423 # useful to bail out early without doing a lot of work;
424 # not a substitute for snags_maybe_bail.
425 snags_maybe_bail() if $snags_tripped && !$opt_force;
428 return $snags_forced || $snags_tripped;
431 sub gbp_pq_export ($$$) {
432 my ($bname, $base, $tip) = @_;
433 # must be run in a workarea. $bname and patch-queue/$bname
434 # ought not to exist. Leaves you on patch-queue/$bname with
435 # the patches staged but not committed.
436 printdebug "gbp_pq_export $bname $base $tip\n";
437 runcmd @git, qw(checkout -q -b), $bname, $base;
438 runcmd @git, qw(checkout -q -b), "patch-queue/$bname", $tip;
439 my @gbp_cmd = (qw(gbp pq export));
440 my $r = system shell_cmd 'exec >../gbp-pq-err 2>&1', @gbp_cmd;
442 { local ($!,$?); copy('../gbp-pq-err', \*STDERR); }
445 runcmd @git, qw(add -f debian/patches) if stat_exists 'debian/patches';
449 # xxx allow merge resolution separately from laundering, before git merge
452 # use git-format-patch?
453 # our own patch identification algorithm?
454 # this is an alternative strategy
456 sub merge_failed ($$;@) {
457 my ($wrecknotes, $emsg, @xmsgs) = @_;
459 push @m, "Merge resolution failed: $emsg";
465 merge_wreckage_cleaning \@updates;
466 run_ref_updates_now "merge failed", \@updates;
470 while (my ($k,$v) = each %$wrecknotes) {
471 push @updates, "create $wrecknoteprefix/$k $v";
473 run_ref_updates_now "merge failed", \@updates;
474 push @m, "Wreckage left in $wrecknoteprefix/*.";
476 push @m, "See git-debrebase(1) section FAILED MERGES for suggestions.";
478 # use finish rather than fail, in case we are within an eval
479 # (that can happen inside walk!)
481 print STDERR "$us: $_\n" foreach @m;
485 sub mwrecknote ($$$) {
486 my ($wrecknotes, $reftail, $commitish) = @_;
487 confess unless defined $commitish;
488 printdebug "mwrecknote $reftail $commitish\n";
489 $wrecknotes->{$reftail} = $commitish;
492 sub merge_attempt_cmd {
493 my $wrecknotes = shift @_;
497 merge_failed $wrecknotes,
498 failedcmd_waitstatus(),
499 "failed command: @_";
503 sub merge_series_patchqueue_convert ($$$);
505 sub merge_series ($$$;@) {
506 my ($newbase, $wrecknotes, $base_q, @input_qs) = @_;
507 # $base_q{SeriesBase} $input_qs[]{SeriesBase}
508 # $base_q{SeriesTip} $input_qs[]{SeriesTip}
509 # ^ specifies several patch series (currently we only support exactly 2)
510 # return value is a commit which is the result of
511 # merging the two versions of the same topic branch
512 # $input_q[0] and $input_q[1]
513 # with respect to the old version
517 # Creates, in *_q, a key MR for its private use
519 printdebug "merge_series newbase=$newbase\n";
521 $input_qs[$_]{MR}{S} = $_ foreach (0..$#input_qs);
522 $base_q->{MR}{S} = 'base';
525 # $prereq{<patch filename>}{<possible prereq}{<S>} = 1 or absent
526 # $prereq{<patch filename>}{<possible prereq} exists or not (later)
527 # $prereq{<patch filename>} exists or not (even later)
531 my $mwrecknote = sub { &mwrecknote($wrecknotes, @_); };
533 my $attempt_cmd = sub { &merge_attempt_cmd($wrecknotes, @_); };
536 fresh_workarea "merge";
537 my $seriesfile = "debian/patches/series";
540 foreach my $q ($base_q, reverse @input_qs) {
542 gbp_pq_export "p-$s", $q->{SeriesBase}, $q->{SeriesTip};
544 if (open S, $seriesfile) {
545 while (my $patch = <S>) {
546 chomp $patch or die $!;
547 $prereq{$patch} //= {};
548 foreach my $earlier (@earlier) {
549 $prereq{$patch}{$earlier}{$s}++ and die;
551 push @earlier, $patch;
552 stat "debian/patches/$patch" or die "$patch ?";
554 S->error and die "$seriesfile $!";
557 die "$seriesfile $!" unless $!==ENOENT;
559 read_tree_upstream $newbase, 1;
560 my $pec = make_commit [ grep { defined } $base_q->{MR}{PEC} ], [
561 "Convert $s to patch queue for merging",
562 "[git-debrebase merge-innards patch-queue import:".
565 printdebug "merge_series pec $pec ";
566 runcmd @git, qw(rm -q --ignore-unmatch --cached), $seriesfile;
567 $pec = make_commit [ $pec ], [
568 "Drop series file from $s to avoid merge trouble",
569 "[git-debrebase merge-innards patch-queue prep:".
573 read_tree_debian $newbase;
575 read_tree_subdir 'debian/patches', "$pec:debian/patches";
577 rm_subdir_cached 'debian/patches';
579 $pec = make_commit [ $pec ], [
580 "Update debian/ (excluding patches) to final to avoid re-merging",
581 "debian/ was already merged and we need to just take that.",
582 "[git-debrebase merge-innards patch-queue packaging:".
586 printdebug "pec' $pec\n";
587 runcmd @git, qw(reset -q --hard), $pec;
588 $q->{MR}{PEC} = $pec;
589 $mwrecknote->("$q->{LeftRight}-patchqueue", $pec);
591 # now, because of reverse, we are on $input_q->{MR}{OQC}
592 runcmd @git, qw(checkout -q -b merge);
593 printdebug "merge_series merging...\n";
594 my @mergecmd = (@git, qw(merge --quiet --no-edit), "p-1");
596 $attempt_cmd->(@mergecmd);
598 printdebug "merge_series merge ok, series...\n";
599 # We need to construct a new series file
600 # Firstly, resolve prereq
601 foreach my $f (sort keys %prereq) {
602 printdebug "merge_series patch\t$f\t";
603 if (!stat_exists "debian/patches/$f") {
604 print DEBUG " drop\n" if $debuglevel;
605 # git merge deleted it; that's how we tell it's not wanted
609 print DEBUG " keep\n" if $debuglevel;
610 foreach my $g (sort keys %{ $prereq{$f} }) {
611 my $gfp = $prereq{$f}{$g};
612 printdebug "merge_series prereq\t$f\t-> $g\t";
613 if (!!$gfp->{0} == !!$gfp->{1}
616 print DEBUG "\tkeep\n" if $debuglevel;
618 print DEBUG "\tdrop\n" if $debuglevel;
619 delete $prereq{$f}{$g};
626 return scalar keys %{ $prereq{$f} };
629 my $nodate = time + 1;
631 # $authordate{<patch filename>};
632 my $authordate = sub {
634 $authordate{$f} //= do {
635 open PF, "<", "debian/patches/$f" or die "$f $!";
637 return $nodate if m/^$/;
638 last if s{^Date: }{};
641 return cmdoutput qw(date +%s -d), $_;
645 open NS, '>', $seriesfile or die $!;
647 while (keys %prereq) {
649 foreach my $try (sort keys %prereq) {
652 $unsat->($try) <=> $unsat->($best) or
653 $authordate->($try) <=> $authordate->($best) or
659 printdebug "merge_series series next $best\n";
660 print NS "$best\n" or die $!;
661 delete $prereq{$best};
662 foreach my $gp (values %prereq) {
667 runcmd @git, qw(add), $seriesfile;
668 runcmd @git, qw(commit --quiet -m), 'Merged patch queue form';
669 $merged_pq = git_rev_parse 'HEAD';
670 $mwrecknote->('merged-patchqueue', $merged_pq);
672 return merge_series_patchqueue_convert
673 $wrecknotes, $newbase, $merged_pq;
676 sub merge_series_patchqueue_convert ($$$) {
677 my ($wrecknotes, $newbase, $merged_pq) = @_;
682 printdebug "merge_series series gbp pq import\n";
683 runcmd @git, qw(checkout -q -b mergec), $merged_pq;
685 merge_attempt_cmd($wrecknotes, qw(gbp pq import));
687 # OK now we are on patch-queue/merge, and we need to rebase
688 # onto the intended parent and drop the patches from each one
690 printdebug "merge_series series ok, building...\n";
691 my $build = $newbase;
692 my @lcmd = (@git, qw(rev-list --reverse mergec..patch-queue/mergec));
693 foreach my $c (grep /./, split /\n/, cmdoutput @lcmd) {
694 my $commit = git_cat_file $c, 'commit';
695 printdebug "merge_series series ok, building $c\n";
696 read_tree_upstream $c, 0, $newbase;
697 my $tree = cmdoutput @git, qw(write-tree);
698 $commit =~ s{^parent (\S+)$}{parent $build}m or confess;
699 $commit =~ s{^tree (\S+)$}{tree $tree}m or confess;
700 open C, ">", "../mcommit" or die $!;
701 print C $commit or die $!;
703 $build = cmdoutput @git, qw(hash-object -w -t commit ../mcommit);
706 mwrecknote($wrecknotes, 'merged-result', $result);
708 runcmd @git, qw(update-ref refs/heads/result), $result;
710 runcmd @git, qw(checkout -q -b debug);
711 runcmd @git, qw(commit --allow-empty -q -m M-INDEX);
712 runcmd @git, qw(add .);
713 runcmd @git, qw(commit --allow-empty -q -m M-WORKTREE);
714 my $mdebug = git_rev_parse 'HEAD';
715 printdebug sprintf "merge_series done debug=%s\n", $mdebug;
716 mwrecknote($wrecknotes, 'merged-debug', $mdebug);
718 printdebug "merge_series returns $result\n";
722 # classify returns an info hash like this
724 # Hdr => # commit headers, including 1 final newline
725 # Msg => # commit message (so one newline is dropped)
727 # Type => (see below)
729 # Ix => $index # ie 0, 1, 2, ...
731 # Differs => return value from get_differs
733 # IsDggitImport => 'orig' 'tarball' 'unpatched' 'package' (as from dgit)
735 # NewMsg => # commit message, but with any [dgit import ...] edited
736 # # to say "[was: ...]"
746 # has additional entres in classification result
747 # Overwritten = [ subset of Parents ]
748 # Contributor = $the_remaining_Parent
750 # DgitImportUnpatched
751 # has additional entry in classification result
752 # OrigParents = [ subset of Parents ]
755 # has additional entry in classification result
756 # OrigParents = [ subset of Parents ] # singleton list
763 # has additional entry in classification result
766 sub parsecommit ($;$) {
767 my ($objid, $p_ref) = @_;
768 # => hash with CommitId Hdr Msg Tree Parents
769 # Parents entries have only Ix CommitId
770 # $p_ref, if provided, must be [] and is used as a base for Parents
775 my ($h,$m) = get_commit $objid;
777 my ($t) = $h =~ m/^tree (\w+)$/m or die $objid;
778 my (@ph) = $h =~ m/^parent (\w+)$/mg;
788 foreach my $ph (@ph) {
790 Ix => scalar @$p_ref,
802 my $r = parsecommit($objid, \@p);
806 $p->{Differs} = (get_differs $p->{CommitId}, $t),
809 printdebug "classify $objid \$t=$t \@p",
810 (map { sprintf " %s/%#x", $_->{CommitId}, $_->{Differs} } @p),
814 my ($type, @rest) = @_;
815 $r = { %$r, Type => $type, @rest };
817 printdebug " = $type ".(dd $r)."\n";
823 $r = { %$r, Type => qw(Unknown), Why => $why };
824 printdebug " ** Unknown\n";
828 if (grep { $_ eq $objid } @opt_anchors) {
829 return $classify->('TreatAsAnchor');
832 my @identical = grep { !$_->{Differs} } @p;
833 my ($stype, $series) = git_cat_file "$t:debian/patches/series";
834 my $haspatches = $stype ne 'missing' && $series =~ m/^\s*[^#\n\t ]/m;
836 if ($r->{Msg} =~ m{^\[git-debrebase anchor.*\]$}m) {
837 # multi-orig upstreams are represented with an anchor merge
838 # from a single upstream commit which combines the orig tarballs
840 # Every anchor tagged this way must be a merge.
841 # We are relying on the
842 # [git-debrebase anchor: ...]
843 # commit message annotation in "declare" anchor merges (which
844 # do not have any upstream changes), to distinguish those
845 # anchor merges from ordinary pseudomerges (which we might
846 # just try to strip).
848 # However, the user is going to be doing git-rebase a lot. We
849 # really don't want them to rewrite an anchor commit.
850 # git-rebase trips up on merges, so that is a useful safety
853 # BreakwaterStart commits are also anchors in the terminology
854 # of git-debrebase(5), but they are untagged (and always
855 # manually generated).
857 # We cannot not tolerate any tagged linear commit (ie,
858 # BreakwaterStart commits tagged `[anchor:') because such a
859 # thing could result from an erroneous linearising raw git
860 # rebase of a merge anchor. That would represent a corruption
861 # of the branch. and we want to detect and reject the results
862 # of such corruption before it makes it out anywhere. If we
863 # reject it here then we avoid making the pseudomerge which
864 # would be needed to push it.
866 my $badanchor = sub { $unknown->("git-debrebase \`anchor' but @_"); };
867 @p == 2 or return $badanchor->("has other than two parents");
868 $haspatches and return $badanchor->("contains debian/patches");
870 # How to decide about l/r ordering of anchors ? git
871 # --topo-order prefers to expand 2nd parent first. There's
872 # already an easy rune to look for debian/ history anyway (git log
873 # debian/) so debian breakwater branch should be 1st parent; that
874 # way also there's also an easy rune to look for the upstream
875 # patches (--topo-order).
877 # Also this makes --first-parent be slightly more likely to
878 # be useful - it makes it provide a linearised breakwater history.
880 # Of course one can say somthing like
881 # gitk -- ':/' ':!/debian'
882 # to get _just_ the commits touching upstream files, and by
883 # the TREESAME logic in git-rev-list this will leave the
884 # breakwater into upstream at the first anchor. But that
885 # doesn't report debian/ changes at all.
887 # Other observations about gitk: by default, gitk seems to
888 # produce output in a different order to git-rev-list. I
889 # can't seem to find this documented anywhere. gitk
890 # --date-order DTRT. But, gitk always seems to put the
891 # parents from left to right, in order, so it's easy to see
892 # which way round a pseudomerge is.
894 $p[0]{IsOrigin} and $badanchor->("is an origin commit");
895 $p[1]{Differs} & ~DS_DEB and
896 $badanchor->("upstream files differ from left parent");
897 $p[0]{Differs} & ~D_UPS and
898 $badanchor->("debian/ differs from right parent");
900 return $classify->(qw(Anchor),
901 OrigParents => [ $p[1] ]);
905 my $d = $r->{Parents}[0]{Differs};
906 if ($d == D_PAT_ADD) {
907 return $classify->(qw(AddPatches));
908 } elsif ($d & (D_PAT_ADD|D_PAT_OTH)) {
909 return $unknown->("edits debian/patches");
910 } elsif ($d & DS_DEB and !($d & ~DS_DEB)) {
911 my ($ty,$dummy) = git_cat_file "$p[0]{CommitId}:debian";
913 if ($d == D_DEB_CLOG) {
914 return $classify->(qw(Changelog));
916 return $classify->(qw(Packaging));
918 } elsif ($ty eq 'missing') {
919 return $classify->(qw(BreakwaterStart));
921 return $unknown->("parent's debian is not a directory");
923 } elsif ($d == D_UPS) {
924 return $classify->(qw(Upstream));
925 } elsif ($d & DS_DEB and $d & D_UPS and !($d & ~(DS_DEB|D_UPS))) {
926 return $classify->(qw(Mixed));
928 return $unknown->("no changes");
930 confess "internal error $objid ?";
934 return $unknown->("origin commit");
937 if (@p == 2 && @identical == 1) {
938 my @overwritten = grep { $_->{Differs} } @p;
939 confess "internal error $objid ?" unless @overwritten==1;
940 return $classify->(qw(Pseudomerge),
941 Overwritten => [ $overwritten[0] ],
942 Contributor => $identical[0]);
944 if (@p == 2 && @identical == 2) {
946 my ($ph,$pm) = get_commit $_[0]{CommitId};
947 $ph =~ m/^committer .* (\d+) [-+]\d+$/m or die "$_->{CommitId} ?";
951 my $order = $get_t->($bytime[0]) <=> $get_t->($bytime[1]);
952 if ($order > 0) { # newer first
953 } elsif ($order < 0) {
954 @bytime = reverse @bytime;
956 # same age, default to order made by -s ours
957 # that is, commit was made by someone who preferred L
959 return $classify->(qw(Pseudomerge),
960 SubType => qw(Ambiguous),
961 Contributor => $bytime[0],
962 Overwritten => [ $bytime[1] ]);
965 my ($p_h, $p_m) = get_commit $p->{CommitId};
966 $p->{IsOrigin} = $p_h !~ m/^parent \w+$/m;
967 ($p->{IsDgitImport},) = $p_m =~ m/^\[dgit import ([0-9a-z]+) .*\]$/m;
969 my @orig_ps = grep { ($_->{IsDgitImport}//'X') eq 'orig' } @p;
971 if (!(grep { !$_->{IsOrigin} } @p) and
972 (@orig_ps >= @p - 1) and
973 $m2 =~ s{^\[(dgit import unpatched .*)\]$}{[was: $1]}m) {
975 return $classify->(qw(DgitImportUnpatched),
976 OrigParents => \@orig_ps);
980 $r->{Msg} =~ m{^\[git-debrebase merged-breakwater.*\]$}m) {
981 # xxx ^ metadata tag needs adding to (5)
982 return $classify->("MergedBreakwaters");
984 if ($r->{Msg} =~ m{^\[(git-debrebase|dgit)[: ].*\]$}m) {
985 return $unknown->("unknown kind of merge from $1");
988 return $unknown->("octopus merge");
991 if (!$ENV{GIT_DEBREBASE_EXPERIMENTAL_MERGE}) {
992 return $unknown->("general two-parent merge");
995 return $classify->("VanillaMerge");
998 sub keycommits ($;$$$$$);
1000 sub mergedbreakwaters_anchor ($) {
1003 foreach my $p (@{ $cl->{Parents} }) {
1004 my ($panchor, $pbw) = keycommits $p->{CommitId},
1005 undef,undef,undef,undef, 1;
1006 $best_anchor = $panchor
1007 if !defined $best_anchor
1008 or is_fast_fwd $best_anchor, $panchor;
1009 fail "inconsistent anchors in merged-breakwaters $p->{CommitId}"
1010 unless is_fast_fwd $panchor, $best_anchor;
1012 return $best_anchor;
1015 sub keycommits ($;$$$$$) {
1016 my ($head, $furniture, $unclean, $trouble, $fatal, $claimed_bw) = @_;
1017 # => ($anchor, $breakwater)
1019 # $unclean->("unclean-$tagsfx", $msg, $cl)
1020 # $furniture->("unclean-$tagsfx", $msg, $cl)
1021 # $dgitimport->("unclean-$tagsfx", $msg, $cl))
1022 # is callled for each situation or commit that
1023 # wouldn't be found in a laundered branch
1024 # $furniture is for furniture commits such as might be found on an
1025 # interchange branch (pseudomerge, d/patches, changelog)
1026 # $trouble is for things whnich prevent the return of
1027 # anchor and breakwater information; if that is ignored,
1028 # then keycommits returns (undef, undef) instead.
1029 # $fatal is for unprocessable commits, and should normally cause
1030 # a failure. If ignored, agaion, (undef, undef) is returned.
1032 # If $claimed_bw, this is supposed to be a breakwater commit.
1034 # If a callback is undef, fail is called instead.
1035 # If a callback is defined but false, the situation is ignored.
1036 # Callbacks may say:
1037 # no warnings qw(exiting); last;
1038 # if the answer is no longer wanted.
1040 my ($anchor, $breakwater);
1041 $breakwater = $head if $claimed_bw;
1045 $fatal //= sub { fail $_[1]; };
1047 my ($cb, $tagsfx, $mainwhy, $xwhy) = @_;
1048 my $why = $mainwhy.$xwhy;
1049 my $m = "branch needs laundering (run git-debrebase): $why";
1050 fail $m unless defined $cb;
1052 $cb->("unclean-$tagsfx", $why, $cl, $mainwhy);
1054 my $found_anchor = sub {
1056 $breakwater //= $clogonly;
1057 $breakwater //= $head;
1058 no warnings qw(exiting);
1062 $cl = classify $head;
1063 my $ty = $cl->{Type};
1064 if ($ty eq 'Packaging') {
1065 $breakwater //= $clogonly;
1066 $breakwater //= $head;
1067 } elsif ($ty eq 'Changelog') {
1068 # this is going to count as the tip of the breakwater
1069 # only if it has no upstream stuff before it
1070 $clogonly //= $head;
1071 } elsif ($ty eq 'Anchor' or
1072 $ty eq 'TreatAsAnchor' or
1073 $ty eq 'BreakwaterStart') {
1074 $found_anchor->($head);
1075 } elsif ($ty eq 'Upstream') {
1076 $x->($unclean, 'ordering',
1077 "packaging change ($breakwater) follows upstream change"," (eg $head)")
1078 if defined $breakwater;
1080 $breakwater = undef;
1081 } elsif ($ty eq 'Mixed') {
1082 $x->($unclean, 'mixed',
1083 "found mixed upstream/packaging commit"," ($head)");
1085 $breakwater = undef;
1086 } elsif ($ty eq 'Pseudomerge' or
1087 $ty eq 'AddPatches') {
1089 $x->($furniture, (lc $ty),
1090 "found interchange bureaucracy commit ($ty)"," ($head)");
1091 } elsif ($ty eq 'DgitImportUnpatched') {
1093 $x->($trouble, 'dgitimport',
1094 "found dgit dsc import"," ($head)");
1095 return (undef,undef);
1097 $x->($fatal, 'unprocessable',
1098 "found bare dgit dsc import with no prior history",
1100 return (undef,undef);
1102 } elsif ($ty eq 'VanillaMerge') {
1103 $x->($trouble, 'vanillamerge',
1104 "found vanilla merge"," ($head)");
1105 return (undef,undef);
1106 } elsif ($ty eq 'MergedBreakwaters') {
1107 $found_anchor->(mergedbreakwaters_anchor $cl);
1109 $x->($fatal, 'unprocessable',
1110 "found unprocessable commit, cannot cope: $cl->{Why}",
1112 return (undef,undef);
1114 $head = $cl->{Parents}[0]{CommitId};
1116 return ($anchor, $breakwater);
1122 $nogenerate,$report, $report_lprefix) = @_;
1123 # => ($tip, $breakwater_tip, $last_anchor)
1124 # (or nothing, if $nogenerate)
1126 printdebug "*** WALK $input ".($nogenerate//0)." ".($report//'-')."\n";
1127 $report_lprefix //= '';
1129 # go through commits backwards
1130 # we generate two lists of commits to apply:
1131 # breakwater branch and upstream patches
1132 my (@brw_cl, @upp_cl, @processed);
1139 my ($prose, $info) = @_;
1140 my $ms = $cl->{Msg};
1143 $ms .= "\n\n[git-debrebase$info: $prose]\n";
1144 return (Msg => $ms);
1146 my $rewrite_from_here = sub {
1148 my $sp_cl = { SpecialMethod => 'StartRewrite' };
1150 push @processed, $sp_cl;
1155 my $prprdelim = sub { print $report $prdelim if $report; $prdelim=""; };
1158 return unless $report;
1159 print $report $prdelim, $report_lprefix, @_;
1163 my $bomb = sub { # usage: return $bomb->();
1164 print $report " Unprocessable" if $report;
1165 print $report " ($cl->{Why})" if $report && defined $cl->{Why};
1168 return (undef,undef);
1170 fail "found unprocessable commit, cannot cope".
1171 (defined $cl->{Why} ? "; $cl->{Why}:": ':').
1172 " (commit $cur) (d.".
1173 (join ' ', map { sprintf "%#x", $_->{Differs} }
1174 @{ $cl->{Parents} }).
1181 my $build_start = sub {
1182 my ($msg, $parent) = @_;
1185 no warnings qw(exiting); last;
1190 merge_failed $cl->{MergeWreckNotes}, $emsg;
1193 my $mwrecknote = sub { &mwrecknote($cl->{MergeWreckNotes}, @_); };
1198 $cl = classify $cur;
1199 $cl->{MergeWreckNotes} //= {};
1200 my $ty = $cl->{Type};
1201 my $st = $cl->{SubType};
1202 $prline->("$cl->{CommitId} $cl->{Type}");
1203 $found{$ty. ( defined($st) ? "-$st" : '' )}++;
1204 push @processed, $cl;
1205 my $p0 = @{ $cl->{Parents} }==1 ? $cl->{Parents}[0]{CommitId} : undef;
1206 if ($ty eq 'AddPatches') {
1208 $rewrite_from_here->(\@upp_cl);
1210 } elsif ($ty eq 'Packaging' or $ty eq 'Changelog') {
1214 } elsif ($ty eq 'BreakwaterStart') {
1215 $last_anchor = $cur;
1216 $build_start->('FirstPackaging', $cur);
1217 } elsif ($ty eq 'Upstream') {
1221 } elsif ($ty eq 'Mixed') {
1224 my $cls = { %$cl, $xmsg->("split mixed commit: $wh part") };
1227 $queue->(\@brw_cl, "debian");
1228 $queue->(\@upp_cl, "upstream");
1229 $rewrite_from_here->(\@brw_cl);
1232 } elsif ($ty eq 'Pseudomerge') {
1233 my $contrib = $cl->{Contributor}{CommitId};
1234 print $report " Contributor=$contrib" if $report;
1235 push @pseudomerges, $cl;
1236 $rewrite_from_here->(\@upp_cl);
1239 } elsif ($ty eq 'Anchor' or $ty eq 'TreatAsAnchor') {
1240 $last_anchor = $cur;
1241 $build_start->("Anchor", $cur);
1242 } elsif ($ty eq 'DgitImportUnpatched') {
1243 my $pm = $pseudomerges[-1];
1245 # To an extent, this is heuristic. Imports don't have
1246 # a useful history of the debian/ branch. We assume
1247 # that the first pseudomerge after an import has a
1248 # useful history of debian/, and ignore the histories
1249 # from later pseudomerges. Often the first pseudomerge
1250 # will be the dgit import of the upload to the actual
1251 # suite intended by the non-dgit NMUer, and later
1252 # pseudomerges may represent in-archive copies.
1253 my $ovwrs = $pm->{Overwritten};
1254 printf $report " PM=%s \@Overwr:%d",
1255 $pm->{CommitId}, (scalar @$ovwrs)
1258 printdebug "*** WALK BOMB DgitImportUnpatched\n";
1261 my $ovwr = $ovwrs->[0]{CommitId};
1262 printf $report " Overwr=%s", $ovwr if $report;
1263 # This import has a tree which is just like a
1264 # breakwater tree, but it has the wrong history. It
1265 # ought to have the previous breakwater (which the
1266 # pseudomerge overwrote) as an ancestor. That will
1267 # make the history of the debian/ files correct. As
1268 # for the upstream version: either it's the same as
1269 # was ovewritten (ie, same as the previous
1270 # breakwater), in which case that history is precisely
1271 # right; or, otherwise, it was a non-gitish upload of a
1272 # new upstream version. We can tell these apart by
1273 # looking at the tree of the supposed upstream.
1276 SpecialMethod => 'DgitImportDebianUpdate',
1277 $xmsg->("convert dgit import: debian changes")
1280 SpecialMethod => 'DgitImportUpstreamUpdate',
1281 $xmsg->("convert dgit import: upstream update",
1284 $prline->(" Import");
1285 $rewrite_from_here->(\@brw_cl);
1286 $upp_limit //= $#upp_cl; # further, deeper, patches discarded
1290 # Everything is from this import. This kind of import
1291 # is already nearly in valid breakwater format, with the
1292 # patches as commits. Unfortunately it contains
1294 printdebug "*** WALK BOMB bare dgit import\n";
1295 $cl->{Why} = "bare dgit dsc import";
1299 } elsif ($ty eq 'MergedBreakwaters') {
1300 $last_anchor = mergedbreakwaters_anchor $cl;
1301 $build_start->(' MergedBreakwaters', $cur);
1303 } elsif ($ty eq 'VanillaMerge') {
1304 # User may have merged unstitched branch(es). We will
1305 # have now lost what ffq-prev was then (since the later
1306 # pseudomerge may introduce further changes). The effect
1307 # of resolving such a merge is that we may have to go back
1308 # further in history to find a merge base, since the one
1309 # which was reachable via ffq-prev is no longer findable.
1310 # This is suboptimal, but if it all works we'll have done
1312 # xxx we should warn the user in the docs about this
1316 # We expect to find a dominating anchor amongst the
1317 # inputs' anchors. That will be the new anchor.
1319 # More complicated is finding a merge base for the
1320 # breakwaters. We need a merge base that is a breakwater
1321 # commit. The ancestors of breakwater commits are more
1322 # breakwater commits and possibly upstream commits and the
1323 # ancestors of those upstream. Upstreams might have
1324 # arbitrary ancestors. But any upstream commit U is
1325 # either included in both anchors, in which case the
1326 # earlier anchor is a better merge base than any of U's
1327 # ancestors; or U is not included in the older anchor, in
1328 # which case U is not an ancestor of the vanilla merge at
1329 # all. So no upstream commit, nor any ancestor thereof,
1330 # is a best merge base. As for non-breakwater Debian
1331 # commits: these are never ancestors of any breakwater.
1333 # So any best merge base as found by git-merge-base
1334 # is a suitable breakwater anchor. Usually there will
1337 printdebug "*** MERGE\n";
1339 my @bwbcmd = (@git, qw(merge-base));
1340 my @ibcmd = (@git, qw(merge-base --all));
1341 my $might_be_in_bw = 1;
1343 my $ps = $cl->{Parents};
1345 $mwrecknote->('vanilla-merge', $cl->{CommitId});
1347 foreach my $p (@$ps) {
1348 $prline->(" VanillaMerge ".$p->{Ix});
1350 my ($ptip, $pbw, $panchor) =
1351 walk $p->{CommitId}, 0, $report,
1352 $report_lprefix.' ';
1353 $p->{Laundered} = $p->{SeriesTip} = $ptip;
1354 $p->{Breakwater} = $p->{SeriesBase} = $pbw;
1355 $p->{Anchor} = $panchor;
1357 my $lr = $p->{LeftRight} = (qw(left right))[$p->{Ix}];
1358 $mwrecknote->("$lr-input", $p->{CommitId});
1360 my $mwrecknote_parent = sub {
1362 $mwrecknote->("$lr-".(lc $which), $p->{$which});
1364 $mwrecknote_parent->('Laundered');
1365 $mwrecknote_parent->('Breakwater');
1366 $mwrecknote_parent->('Anchor');
1368 $best_anchor = $panchor if
1369 !defined $best_anchor or
1370 is_fast_fwd $best_anchor, $panchor;
1372 printdebug " MERGE BA best=".($best_anchor//'-').
1376 $mwrecknote->('result-anchor', $best_anchor);
1378 foreach my $p (@$ps) {
1379 $prline->(" VanillaMerge ".$p->{Ix});
1380 if (!is_fast_fwd $p->{Anchor}, $best_anchor) {
1381 $nomerge->('divergent anchors');
1382 } elsif ($p->{Anchor} eq $best_anchor) {
1383 print $report " SameAnchor" if $report;
1385 print $report " SupersededAnchor" if $report;
1387 if ($p->{Breakwater} eq $p->{CommitId}) {
1388 # this parent commit was its own breakwater,
1389 # ie it is part of the breakwater
1390 print $report " Breakwater" if $report;
1392 $might_be_in_bw = 0;
1394 push @bwbcmd, $p->{Breakwater};
1395 push @ibcmd, $p->{CommitId};
1398 if ($ok && $might_be_in_bw) {
1399 # We could rewrite this to contaion the metadata
1400 # declaring it to be MergedBreakwaters, but
1401 # unnecessarily rewriting a merge seems unhelpful.
1402 $prline->(" VanillaMerge MergedBreakwaters");
1403 $last_anchor = $best_anchor;
1404 $build_start->('MergedBreakwaters', $cur);
1407 my $bwb = cmdoutput @bwbcmd;
1409 # OK, now we have a breakwater base, but we need the merge
1410 # base for the interchange branch because we need the delta
1413 # This a the best merge base of our inputs which has the
1414 # breakwater merge base as an ancestor.
1421 @ibs or confess 'internal error, expected anchor at least ?';
1425 foreach my $tibix (0..$#ibs) {
1426 my $tib = $ibs[$tibix];
1427 my $ff = is_fast_fwd $bwb, $tib;
1428 my $ok = !$ff ? 'rej' : $ib ? 'extra' : 'ok';
1429 my $tibleaf = "interchange-mbcand-$ok-$tibix";
1430 $mwrecknote->($tibleaf, $tib);
1437 $ib or $nomerge->("no suitable interchange merge base");
1439 $prline->(" VanillaMerge Base");
1441 my ($btip, $bbw, $banchor) = eval {
1442 walk $ib, 0, $report, $report_lprefix.' ';
1444 $nomerge->("walking interchange branch merge base ($ibleaf):\n".
1448 $mwrecknote->("mergebase-laundered", $btip);
1449 $mwrecknote->("mergebase-breakwater", $bbw);
1450 $mwrecknote->("mergebase-anchor", $banchor);
1452 my $ibinfo = { SeriesTip => $btip,
1455 LeftRight => 'mergebase' };
1458 or $nomerge->("interchange merge-base ($ib)'s".
1459 " breakwater ($bbw)".
1460 " != breakwaters' merge-base ($bwb)");
1462 grep { $_->{Anchor} eq $ibinfo->{Anchor} } @$ps
1463 or $nomerge->("interchange merge-base ($ib)'s".
1464 " anchor ($ibinfo->{SeriesBase})".
1465 " != any merge input's anchor (".
1466 (join ' ', map { $_->{Anchor} } @$ps).
1469 $cl->{MergeInterchangeBaseInfo} = $ibinfo;
1470 $cl->{MergeBestAnchor} = $best_anchor;
1473 SpecialMethod => 'MergeCreateMergedBreakwaters',
1474 $xmsg->('constructed from vanilla merge',
1475 ' merged-breakwater'),
1479 SpecialMethod => 'MergeMergeSeries',
1481 $build_start->('MergeBreakwaters', $cur);
1483 printdebug "*** WALK BOMB unrecognised\n";
1489 printdebug "*** WALK prep done cur=$cur".
1490 " brw $#brw_cl upp $#upp_cl proc $#processed pm $#pseudomerges\n";
1492 return if $nogenerate;
1494 # Now we build it back up again
1500 $#upp_cl = $upp_limit if defined $upp_limit;
1502 my $committer_authline = calculate_committer_authline();
1504 printdebug "WALK REBUILD $build ".(scalar @processed)."\n";
1506 confess "internal error" unless $build eq (pop @processed)->{CommitId};
1509 mkdir $rd or $!==EEXIST or die $!;
1511 my $want_debian = $build;
1512 my $want_upstream = $build;
1514 my $read_tree_upstream = sub { ($want_upstream) = @_; };
1515 my $read_tree_debian = sub { ($want_debian) = @_; };
1517 foreach my $cl (qw(Debian), (reverse @brw_cl),
1518 { SpecialMethod => 'RecordBreakwaterTip' },
1519 qw(Upstream), (reverse @upp_cl)) {
1521 $current_method = $cl;
1524 my $method = $cl->{SpecialMethod} // $current_method;
1525 my @parents = ($build);
1526 my $cltree = $cl->{CommitId};
1527 printdebug "WALK BUILD ".($cltree//'undef').
1528 " $method (rewriting=$rewriting)\n";
1529 if ($method eq 'Debian') {
1530 $read_tree_debian->($cltree);
1531 } elsif ($method eq 'Upstream') {
1532 $read_tree_upstream->($cltree);
1533 } elsif ($method eq 'StartRewrite') {
1536 } elsif ($method eq 'RecordBreakwaterTip') {
1537 $breakwater = $build;
1539 } elsif ($method eq 'DgitImportDebianUpdate') {
1540 $read_tree_debian->($cltree);
1541 } elsif ($method eq 'DgitImportUpstreamUpdate') {
1542 confess unless $rewriting;
1543 my $differs = (get_differs $build, $cltree);
1544 next unless $differs & D_UPS;
1545 $read_tree_upstream->($cltree);
1546 push @parents, map { $_->{CommitId} } @{ $cl->{OrigParents} };
1547 } elsif ($method eq 'MergeCreateMergedBreakwaters') {
1548 print "Found a general merge, will try to tidy it up.\n";
1550 $read_tree_upstream->($cl->{MergeBestAnchor});
1551 $read_tree_debian->($cltree);
1552 @parents = map { $_->{Breakwater} } @{ $cl->{Parents} };
1553 } elsif ($method eq 'MergeMergeSeries') {
1554 my $cachehit = reflog_cache_lookup
1555 $merge_cache_ref, "vanilla-merge $cl->{CommitId}";
1557 print "Using supplied resolution for $cl->{CommitId}...\n";
1559 $mwrecknote->('cached-resolution', $build);
1561 print "Running merge resolution for $cl->{CommitId}...\n";
1562 $mwrecknote->('new-base', $build);
1563 $build = merge_series
1564 $build, $cl->{MergeWreckNotes},
1565 $cl->{MergeInterchangeBaseInfo},
1566 @{ $cl->{Parents} };
1568 $last_anchor = $cl->{MergeBestAnchor};
1570 # Check for mismerges:
1572 my ($against, $allow, $what) = @_;
1573 my $differs = get_differs $build, $against;
1575 "merge misresolved: %s are not the same (%s %s d.%#x)",
1576 $what, $against, $build, $differs)
1577 if $differs & ~($allow | D_PAT_ADD);
1580 # Breakwater changes which were in each side of the
1581 # merge will have been incorporated into the
1582 # MergeCreateMergedBreakwaters output. Because the
1583 # upstream series was rebased onto the new breakwater,
1584 # so should all of the packaging changes which were in
1586 $check->($input, D_UPS, 'debian files');
1588 # Upstream files are merge_series, which ought to
1589 # have been identical to the original merge.
1590 $check->($cl->{CommitId}, DS_DEB, 'upstream files');
1592 print "Merge resolution successful.\n";
1595 confess "$method ?";
1598 my $procd = (pop @processed) // 'UNDEF';
1599 if ($cl ne $procd) {
1601 printdebug "WALK REWRITING NOW cl=$cl procd=$procd\n";
1604 if ($rewriting || $opt_careful) {
1605 read_tree_upstream $want_upstream, 0, $want_debian;
1607 my $newtree = cmdoutput @git, qw(write-tree);
1608 my $ch = $cl->{Hdr};
1609 $ch =~ s{^tree .*}{tree $newtree}m or confess "$ch ?";
1610 $ch =~ s{^parent .*\n}{}mg;
1611 $ch =~ s{(?=^author)}{
1612 join '', map { "parent $_\n" } @parents
1613 }me or confess "$ch ?";
1615 $ch =~ s{^committer .*$}{$committer_authline}m
1618 my $cf = "$rd/m$rewriting";
1619 open CD, ">", $cf or die $!;
1620 print CD $ch, "\n", $cl->{Msg} or die $!;
1622 my @cmd = (@git, qw(hash-object));
1623 push @cmd, qw(-w) if $rewriting;
1624 push @cmd, qw(-t commit), $cf;
1625 my $newcommit = cmdoutput @cmd;
1626 confess "$ch ?" unless $rewriting
1627 or $newcommit eq $cl->{CommitId};
1628 $build = $newcommit;
1630 $build = $cl->{CommitId};
1631 trees_diff_walk "$want_upstream:", "$build:", sub {
1633 no warnings qw(exiting);
1634 next if $n eq 'debian/';
1635 confess "mismatch @_ ?";
1637 trees_diff_walk "$want_debian:debian", "$build:debian", sub {
1638 confess "mismatch @_ ?";
1640 my @old_parents = map { $_->{CommitId} } @{ $cl->{Parents} };
1641 confess "mismatch @parents != @old_parents ?"
1642 unless "@parents" eq "@old_parents";
1644 if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
1645 $last_anchor = $cur;
1650 my $final_check = get_differs $build, $input;
1651 die sprintf "internal error %#x %s %s", $final_check, $input, $build
1652 if $final_check & ~D_PAT_ADD;
1654 my @r = ($build, $breakwater, $last_anchor);
1655 printdebug "*** WALK RETURN @r\n";
1660 git_check_unmodified();
1661 return git_rev_parse qw(HEAD);
1664 sub update_head ($$$) {
1665 my ($old, $new, $mrest) = @_;
1666 push @deferred_updates, "update HEAD $new $old";
1667 run_deferred_updates $mrest;
1670 sub update_head_checkout ($$$) {
1671 my ($old, $new, $mrest) = @_;
1672 update_head $old, $new, $mrest;
1673 runcmd @git, qw(reset --hard);
1676 sub update_head_postlaunder ($$$) {
1677 my ($old, $tip, $reflogmsg) = @_;
1678 return if $tip eq $old && !@deferred_updates;
1679 print "git-debrebase: laundered (head was $old)\n";
1680 update_head $old, $tip, $reflogmsg;
1681 # no tree changes except debian/patches
1682 runcmd @git, qw(rm --quiet --ignore-unmatch -rf debian/patches);
1685 sub currently_rebasing() {
1686 foreach (qw(rebase-merge rebase-apply)) {
1687 return 1 if stat_exists "$maindir_gitdir/$_";
1692 sub bail_if_rebasing() {
1693 fail "you are in the middle of a git-rebase already"
1694 if currently_rebasing();
1697 sub do_launder_head ($) {
1698 my ($reflogmsg) = @_;
1699 my $old = get_head();
1701 my ($tip,$breakwater) = walk $old;
1703 update_head_postlaunder $old, $tip, $reflogmsg;
1704 return ($tip,$breakwater);
1707 sub cmd_launder_v0 () {
1708 badusage "no arguments to launder-v0 allowed" if @ARGV;
1709 my $old = get_head();
1710 my ($tip,$breakwater,$last_anchor) = walk $old;
1711 update_head_postlaunder $old, $tip, 'launder';
1712 printf "# breakwater tip\n%s\n", $breakwater;
1713 printf "# working tip\n%s\n", $tip;
1714 printf "# last anchor\n%s\n", $last_anchor;
1717 sub defaultcmd_rebase () {
1718 push @ARGV, @{ $opt_defaultcmd_interactive // [] };
1719 my ($tip,$breakwater) = do_launder_head 'launder for rebase';
1720 runcmd @git, qw(rebase), @ARGV, $breakwater if @ARGV;
1723 sub cmd_analyse () {
1724 badusage "analyse does not support any options"
1725 if @ARGV and $ARGV[0] =~ m/^-/;
1726 badusage "too many arguments to analyse" if @ARGV>1;
1729 $old = git_rev_parse $old;
1731 $old = git_rev_parse 'HEAD';
1733 my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
1734 STDOUT->error and die $!;
1737 sub ffq_prev_branchinfo () {
1738 my $current = git_get_symref();
1739 return gdr_ffq_prev_branchinfo($current);
1742 sub ffq_check ($;$$) {
1743 # calls $ff and/or $notff zero or more times
1744 # then returns either (status,message) where status is
1749 # or (undef,undef, $ffq_prev,$gdrlast)
1750 # $ff and $notff are called like this:
1751 # $ff->("message for stdout\n");
1752 # $notff->('snag-name', $message);
1753 # normally $currentval should be HEAD
1754 my ($currentval, $ff, $notff) =@_;
1756 $ff //= sub { print $_[0] or die $!; };
1759 my ($status, $message, $current, $ffq_prev, $gdrlast)
1760 = ffq_prev_branchinfo();
1761 return ($status, $message) unless $status eq 'branch';
1763 my $exists = git_get_ref $ffq_prev;
1764 return ('exists',"$ffq_prev already exists") if $exists;
1766 return ('not-branch', 'HEAD symref is not to refs/heads/')
1767 unless $current =~ m{^refs/heads/};
1770 my @check_specs = split /\;/, (cfg "branch.$branch.ffq-ffrefs",1) // '*';
1773 printdebug "ffq check_specs @check_specs\n";
1776 my ($lrref, $desc) = @_;
1777 printdebug "ffq might check $lrref ($desc)\n";
1779 for my $chk (@check_specs) {
1781 $invert = $glob =~ s{^[!^]}{};
1782 last if fnmatch $glob, $lrref;
1785 my $lrval = git_get_ref $lrref;
1786 return unless length $lrval;
1788 if (is_fast_fwd $lrval, $currentval) {
1789 $ff->("OK, you are ahead of $lrref\n");
1790 $checked{$lrref} = 1;
1791 } elsif (is_fast_fwd $currentval, $lrval) {
1792 $checked{$lrref} = -1;
1793 $notff->('behind', "you are behind $lrref, divergence risk");
1795 $checked{$lrref} = -1;
1796 $notff->('diverged', "you have diverged from $lrref");
1800 my $merge = cfg "branch.$branch.merge",1;
1801 if (defined $merge and $merge =~ m{^refs/heads/}) {
1803 printdebug "ffq merge $rhs\n";
1804 my $check_remote = sub {
1805 my ($remote, $desc) = @_;
1806 printdebug "ffq check_remote ".($remote//'undef')." $desc\n";
1807 return unless defined $remote;
1808 $check->("refs/remotes/$remote/$rhs", $desc);
1810 $check_remote->((scalar cfg "branch.$branch.remote",1),
1811 'remote fetch/merge branch');
1812 $check_remote->((scalar cfg "branch.$branch.pushRemote",1) //
1813 (scalar cfg "branch.$branch.pushDefault",1),
1814 'remote push branch');
1816 if ($branch =~ m{^dgit/}) {
1817 $check->("refs/remotes/dgit/$branch", 'remote dgit branch');
1818 } elsif ($branch =~ m{^master$}) {
1819 $check->("refs/remotes/dgit/dgit/sid", 'remote dgit branch for sid');
1821 return (undef, undef, $ffq_prev, $gdrlast);
1824 sub record_ffq_prev_deferred () {
1825 # => ('status', "message")
1827 # deferred message is undef
1832 # if not ff from some branch we should be ff from, is an snag
1833 # if "deferred", will have added something about that to
1834 # @deferred_update_messages, and also maybe printed (already)
1835 # some messages about ff checks
1837 my $currentval = get_head();
1839 my ($status,$message, $ffq_prev,$gdrlast) = ffq_check $currentval;
1840 return ($status,$message) if defined $status;
1844 push @deferred_updates, "update $ffq_prev $currentval $git_null_obj";
1845 push @deferred_updates, "delete $gdrlast";
1846 push @deferred_update_messages, "Recorded previous head for preservation";
1847 return ('deferred', undef);
1850 sub record_ffq_auto () {
1851 my ($status, $message) = record_ffq_prev_deferred();
1852 if ($status eq 'deferred' || $status eq 'exists') {
1854 snag $status, "could not record ffq-prev: $message";
1859 sub ffq_prev_info () {
1861 # => ($ffq_prev, $gdrlast, $ffq_prev_commitish)
1862 my ($status, $message, $current, $ffq_prev, $gdrlast)
1863 = ffq_prev_branchinfo();
1864 if ($status ne 'branch') {
1865 snag $status, "could not check ffq-prev: $message";
1868 my $ffq_prev_commitish = $ffq_prev && git_get_ref $ffq_prev;
1869 return ($ffq_prev, $gdrlast, $ffq_prev_commitish);
1872 sub stitch ($$$$$) {
1873 my ($old_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose) = @_;
1875 push @deferred_updates, "delete $ffq_prev $ffq_prev_commitish";
1877 if (is_fast_fwd $old_head, $ffq_prev_commitish) {
1878 my $differs = get_differs $old_head, $ffq_prev_commitish;
1879 unless ($differs & ~D_PAT_ADD) {
1880 # ffq-prev is ahead of us, and the only tree changes it has
1881 # are possibly addition of things in debian/patches/.
1882 # Just wind forwards rather than making a pointless pseudomerge.
1883 push @deferred_updates,
1884 "update $gdrlast $ffq_prev_commitish $git_null_obj";
1885 update_head_checkout $old_head, $ffq_prev_commitish,
1886 "stitch (fast forward)";
1891 # We make pseudomerges with L as the contributing parent.
1892 # This makes git rev-list --first-parent work properly.
1893 my $new_head = make_commit [ $old_head, $ffq_prev ], [
1894 'Declare fast forward / record previous work',
1895 "[git-debrebase pseudomerge: $prose]",
1897 push @deferred_updates, "update $gdrlast $new_head $git_null_obj";
1898 update_head $old_head, $new_head, "stitch: $prose";
1901 sub do_stitch ($;$) {
1902 my ($prose, $unclean) = @_;
1904 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
1905 if (!$ffq_prev_commitish) {
1906 fail "No ffq-prev to stitch." unless $opt_noop_ok;
1909 my $dangling_head = get_head();
1911 keycommits $dangling_head, $unclean,$unclean,$unclean;
1914 stitch($dangling_head, $ffq_prev, $gdrlast, $ffq_prev_commitish, $prose);
1917 sub upstream_commitish_search ($$) {
1918 my ($upstream_version, $tried) = @_;
1919 # todo: at some point maybe use git-deborig to do this
1920 foreach my $tagpfx ('', 'v', 'upstream/') {
1921 my $tag = $tagpfx.(dep14_version_mangle $upstream_version);
1922 my $new_upstream = git_get_ref "refs/tags/$tag";
1924 return $new_upstream if length $new_upstream;
1928 sub resolve_upstream_version ($$) {
1929 my ($new_upstream, $upstream_version) = @_;
1931 if (!defined $new_upstream) {
1933 $new_upstream = upstream_commitish_search $upstream_version, \@tried;
1934 if (!length $new_upstream) {
1935 fail "Could not determine appropriate upstream commitish.\n".
1936 " (Tried these tags: @tried)\n".
1937 " Check version, and specify upstream commitish explicitly.";
1940 $new_upstream = git_rev_parse $new_upstream;
1942 return $new_upstream;
1945 sub cmd_new_upstream () {
1946 # automatically and unconditionally launders before rebasing
1947 # if rebase --abort is used, laundering has still been done
1951 badusage "need NEW-VERSION [UPS-COMMITTISH]" unless @ARGV >= 1;
1953 # parse args - low commitment
1954 my $spec_version = shift @ARGV;
1955 my $new_version = (new Dpkg::Version $spec_version, check => 1);
1956 fail "bad version number \`$spec_version'" unless defined $new_version;
1957 if ($new_version->is_native()) {
1958 $new_version = (new Dpkg::Version "$spec_version-1", check => 1);
1961 my $new_upstream = shift @ARGV;
1962 my $new_upstream_version = upstreamversion $new_version;
1964 resolve_upstream_version $new_upstream, $new_upstream_version;
1969 my ($n, @x) = @_; # may be ''
1970 my $pc = $pieces{$n} //= {
1972 Desc => ($n ? "upstream piece \`$n'" : "upstream (main piece"),
1974 while (my $k = shift @x) { $pc->{$k} = shift @x; }
1979 my $newpiece = sub {
1980 my ($n, @x) = @_; # may be ''
1981 my $pc = $piece->($n, @x, NewIx => (scalar @newpieces));
1982 push @newpieces, $pc;
1987 New => $new_upstream,
1989 while (@ARGV && $ARGV[0] !~ m{^-}) {
1990 my $n = shift @ARGV;
1992 badusage "for each EXTRA-UPS-NAME need EXTRA-UPS-COMMITISH"
1993 unless @ARGV && $ARGV[0] !~ m{^-};
1995 my $c = git_rev_parse shift @ARGV;
1996 die unless $n =~ m/^$extra_orig_namepart_re$/;
1997 $newpiece->($n, New => $c);
2000 # now we need to investigate the branch this generates the
2001 # laundered version but we don't switch to it yet
2002 my $old_head = get_head();
2003 my ($old_laundered_tip,$old_bw,$old_anchor) = walk $old_head;
2005 my $old_bw_cl = classify $old_bw;
2006 my $old_anchor_cl = classify $old_anchor;
2008 if (!$old_anchor_cl->{OrigParents}) {
2009 snag 'anchor-treated',
2010 'old anchor is recognised due to --anchor, cannot check upstream';
2012 $old_upstream = parsecommit
2013 $old_anchor_cl->{OrigParents}[0]{CommitId};
2014 $piece->('', Old => $old_upstream->{CommitId});
2017 if ($old_upstream && $old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
2018 if ($old_upstream->{Msg} =~
2019 m{^\[git-debrebase upstream-combine (\.(?: $extra_orig_namepart_re)+)\:.*\]$}m
2021 my @oldpieces = (split / /, $1);
2022 my $old_n_parents = scalar @{ $old_upstream->{Parents} };
2023 if ($old_n_parents != @oldpieces &&
2024 $old_n_parents != @oldpieces + 1) {
2025 snag 'upstream-confusing', sprintf
2026 "previous upstream combine %s".
2027 " mentions %d pieces (each implying one parent)".
2028 " but has %d parents".
2029 " (one per piece plus maybe a previous combine)",
2030 $old_upstream->{CommitId},
2031 (scalar @oldpieces),
2033 } elsif ($oldpieces[0] ne '.') {
2034 snag 'upstream-confusing', sprintf
2035 "previous upstream combine %s".
2036 " first piece is not \`.'",
2040 foreach my $i (0..$#oldpieces) {
2041 my $n = $oldpieces[$i];
2042 my $hat = 1 + $i + ($old_n_parents - @oldpieces);
2043 $piece->($n, Old => $old_upstream->{CommitId}.'^'.$hat);
2047 snag 'upstream-confusing',
2048 "previous upstream $old_upstream->{CommitId} is from".
2049 " git-debrebase but not an \`upstream-combine' commit";
2053 foreach my $pc (values %pieces) {
2054 if (!$old_upstream) {
2055 # we have complained already
2056 } elsif (!$pc->{Old}) {
2057 snag 'upstream-new-piece',
2058 "introducing upstream piece \`$pc->{Name}'";
2059 } elsif (!$pc->{New}) {
2060 snag 'upstream-rm-piece',
2061 "dropping upstream piece \`$pc->{Name}'";
2062 } elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
2063 snag 'upstream-not-ff',
2064 "not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}";
2068 printdebug "%pieces = ", (dd \%pieces), "\n";
2069 printdebug "\@newpieces = ", (dd \@newpieces), "\n";
2077 my @upstream_merge_parents;
2080 push @upstream_merge_parents, $old_upstream->{CommitId};
2083 foreach my $pc (@newpieces) { # always has '' first
2085 read_tree_subdir $pc->{Name}, $pc->{New};
2087 runcmd @git, qw(read-tree), $pc->{New};
2089 push @upstream_merge_parents, $pc->{New};
2092 # index now contains the new upstream
2094 if (@newpieces > 1) {
2095 # need to make the upstream subtree merge commit
2096 $new_upstream = make_commit \@upstream_merge_parents,
2097 [ "Combine upstreams for $new_upstream_version",
2098 ("[git-debrebase upstream-combine . ".
2099 (join " ", map { $_->{Name} } @newpieces[1..$#newpieces]).
2104 # $new_upstream is either the single upstream commit, or the
2105 # combined commit we just made. Either way it will be the
2106 # "upstream" parent of the anchor merge.
2108 read_tree_subdir 'debian', "$old_bw:debian";
2110 # index now contains the anchor merge contents
2111 $new_bw = make_commit [ $old_bw, $new_upstream ],
2112 [ "Update to upstream $new_upstream_version",
2113 "[git-debrebase anchor: new upstream $new_upstream_version, merge]",
2116 my $clogsignoff = cmdoutput qw(git show),
2117 '--pretty=format:%an <%ae> %aD',
2120 # Now we have to add a changelog stanza so the Debian version
2122 die if unlink "debian";
2123 die $! unless $!==ENOENT or $!==ENOTEMPTY;
2124 unlink "debian/changelog" or $!==ENOENT or die $!;
2125 mkdir "debian" or die $!;
2126 open CN, ">", "debian/changelog" or die $!;
2127 my $oldclog = git_cat_file ":debian/changelog";
2128 $oldclog =~ m/^($package_re) \(\S+\) / or
2129 fail "cannot parse old changelog to get package name";
2131 print CN <<END, $oldclog or die $!;
2132 $p ($new_version) UNRELEASED; urgency=medium
2134 * Update to new upstream version $new_upstream_version.
2140 runcmd @git, qw(update-index --add --replace), 'debian/changelog';
2142 # Now we have the final new breakwater branch in the index
2143 $new_bw = make_commit [ $new_bw ],
2144 [ "Update changelog for new upstream $new_upstream_version",
2145 "[git-debrebase: new upstream $new_upstream_version, changelog]",
2149 # we have constructed the new breakwater. we now need to commit to
2150 # the laundering output, because git-rebase can't easily be made
2151 # to make a replay list which is based on some other branch
2153 update_head_postlaunder $old_head, $old_laundered_tip,
2154 'launder for new upstream';
2156 my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw, @ARGV);
2157 local $ENV{GIT_REFLOG_ACTION} = git_reflog_action_msg
2158 "debrebase new-upstream $new_version: rebase";
2160 # now it's for the user to sort out
2163 sub cmd_record_ffq_prev () {
2164 badusage "no arguments allowed" if @ARGV;
2165 my ($status, $msg) = record_ffq_prev_deferred();
2166 if ($status eq 'exists' && $opt_noop_ok) {
2167 print "Previous head already recorded\n" or die $!;
2168 } elsif ($status eq 'deferred') {
2169 run_deferred_updates 'record-ffq-prev';
2171 fail "Could not preserve: $msg";
2176 badusage "no arguments allowed" if @ARGV;
2177 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
2178 print "$bw\n" or die $!;
2181 sub cmd_breakwater () {
2182 badusage "no arguments allowed" if @ARGV;
2183 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'), 0,0;
2184 print "$bw\n" or die $!;
2188 badusage "no arguments allowed" if @ARGV;
2190 # todo: gdr status should print divergence info
2191 # todo: gdr status should print upstream component(s) info
2192 # todo: gdr should leave/maintain some refs with this kind of info ?
2194 my $oldest = { Badness => 0 };
2197 my ($badness, $ourmsg, $snagname, $dummy, $cl, $kcmsg) = @_;
2198 if ($oldest->{Badness} < $badness) {
2199 $oldest = $newest = undef;
2202 Badness => $badness,
2203 CommitId => $cl->{CommitId},
2207 $newest //= $oldest;
2209 my ($anchor, $bw) = keycommits +(git_rev_parse 'HEAD'),
2210 sub { $note->(1, 'branch contains furniture (not laundered)', @_); },
2211 sub { $note->(2, 'branch is unlaundered', @_); },
2212 sub { $note->(3, 'branch needs laundering', @_); },
2213 sub { $note->(4, 'branch not in git-debrebase form', @_); };
2215 my $prcommitinfo = sub {
2217 flush STDOUT or die $!;
2218 runcmd @git, qw(--no-pager log -n1),
2219 '--pretty=format: %h %s%n',
2223 print "current branch contents, in git-debrebase terms:\n";
2224 if (!$oldest->{Badness}) {
2225 print " branch is laundered\n";
2227 print " $oldest->{OurMsg}\n";
2229 foreach my $info ($oldest, $newest) {
2230 my $cid = $info->{CommitId};
2231 next if $cid eq $printed;
2233 print " $info->{KcMsg}\n";
2234 $prcommitinfo->($cid);
2239 my ($cid, $what) = @_;
2240 if (!defined $cid) {
2241 print " $what is not well-defined\n";
2244 $prcommitinfo->($cid);
2247 print "key git-debrebase commits:\n";
2248 $prab->($anchor, 'anchor');
2249 $prab->($bw, 'breakwater');
2251 my ($ffqstatus, $ffq_msg, $current, $ffq_prev, $gdrlast) =
2252 ffq_prev_branchinfo();
2254 print "branch and ref status, in git-debrebase terms:\n";
2256 print " $ffq_msg\n";
2258 $ffq_prev = git_get_ref $ffq_prev;
2259 $gdrlast = git_get_ref $gdrlast;
2261 print " unstitched; previous tip was:\n";
2262 $prcommitinfo->($ffq_prev);
2263 } elsif (!$gdrlast) {
2264 print " stitched? (no record of git-debrebase work)\n";
2265 } elsif (is_fast_fwd $gdrlast, 'HEAD') {
2266 print " stitched\n";
2268 print " not git-debrebase (diverged since last stitch)\n"
2271 print "you are currently rebasing\n" if currently_rebasing();
2275 my $prose = 'stitch';
2276 getoptions("stitch",
2277 'prose=s', \$prose);
2278 badusage "no arguments allowed" if @ARGV;
2279 do_stitch $prose, 0;
2281 sub cmd_prepush () {
2287 badusage "no arguments allowed" if @ARGV;
2288 do_launder_head 'launder for git-debrebase quick';
2292 sub cmd_conclude () {
2293 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
2294 if (!$ffq_prev_commitish) {
2295 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2298 my $dangling_head = get_head();
2300 badusage "no arguments allowed" if @ARGV;
2301 do_launder_head 'launder for git-debrebase quick';
2306 if (currently_rebasing()) {
2307 runcmd @git, qw(rebase --abort);
2308 push @deferred_updates, 'verify HEAD HEAD';
2309 # noop, but stops us complaining that scrap was a noop
2311 badusage "no arguments allowed" if @ARGV;
2312 my ($ffq_prev, $gdrlast, $ffq_prev_commitish) = ffq_prev_info();
2314 if ($ffq_prev_commitish) {
2315 $scrapping_head = get_head();
2316 push @deferred_updates,
2317 "update $gdrlast $ffq_prev_commitish $git_null_obj",
2318 "update $ffq_prev $git_null_obj $ffq_prev_commitish";
2320 if (git_get_ref $merge_cache_ref) {
2321 push @deferred_updates,
2322 "delete $merge_cache_ref";
2324 if (!@deferred_updates) {
2325 fail "No ongoing git-debrebase session." unless $opt_noop_ok;
2329 if ($scrapping_head) {
2330 update_head_checkout $scrapping_head, $ffq_prev_commitish, "scrap";
2332 run_deferred_updates "scrap";
2336 sub make_patches_staged ($) {
2338 # Produces the patches that would result from $head if it were
2340 my ($secret_head, $secret_bw, $last_anchor) = walk $head;
2343 gbp_pq_export 'bw', $secret_bw, $secret_head;
2347 sub make_patches ($) {
2349 keycommits $head, 0, \&snag;
2350 make_patches_staged $head;
2353 my $ptree = cmdoutput @git, qw(write-tree --prefix=debian/patches/);
2354 runcmd @git, qw(read-tree), $head;
2355 read_tree_subdir 'debian/patches', $ptree;
2356 $out = make_commit [$head], [
2357 'Commit patch queue (exported by git-debrebase)',
2358 '[git-debrebase: export and commit patches]',
2364 sub cmd_make_patches () {
2365 my $opt_quiet_would_amend;
2366 getoptions("make-patches",
2367 'quiet-would-amend!', \$opt_quiet_would_amend);
2368 badusage "no arguments allowed" if @ARGV;
2370 my $old_head = get_head();
2371 my $new = make_patches $old_head;
2372 my $d = get_differs $old_head, $new;
2374 fail "No (more) patches to export." unless $opt_noop_ok;
2376 } elsif ($d == D_PAT_ADD) {
2378 update_head_checkout $old_head, $new, 'make-patches';
2380 print STDERR failmsg
2381 "Patch export produced patch amendments".
2382 " (abandoned output commit $new).".
2383 " Try laundering first."
2384 unless $opt_quiet_would_amend;
2389 sub check_series_has_all_patches ($) {
2391 my $seriesfn = 'debian/patches/series';
2392 my ($dummy, $series) = git_cat_file "$head:$seriesfn",
2396 foreach my $f (grep /\S/, grep {!m/^\s\#/} split /\n/, $series) {
2397 fail "patch $f repeated in $seriesfn !" if $series{$f}++;
2399 foreach my $patchfile (get_tree "$head:debian/patches", 1,1) {
2400 my ($f,$i) = @$patchfile;
2401 next if $series{$f};
2402 next if $f eq 'series';
2403 snag 'unused-patches', "Unused patch file $f will be discarded";
2407 sub cmd_convert_from_gbp () {
2408 badusage "want only 1 optional argument, the upstream git commitish"
2411 my $clogp = parsechangelog();
2412 my $version = $clogp->{'Version'}
2413 // die "missing Version from changelog";
2415 my ($upstream_spec) = @ARGV;
2417 my $upstream_version = upstreamversion $version;
2419 resolve_upstream_version($upstream_spec, $upstream_version);
2421 my $old_head = get_head();
2423 my $upsdiff = get_differs $upstream, $old_head;
2424 if ($upsdiff & D_UPS) {
2425 runcmd @git, qw(--no-pager diff --stat),
2426 $upstream, $old_head,
2427 qw( -- :!/debian :/);
2429 upstream ($upstream_spec) and HEAD are not
2430 identical in upstream files. See diffstat above, or run
2431 git diff $upstream_spec HEAD -- :!/debian :/
2435 if (!is_fast_fwd $upstream, $old_head) {
2436 snag 'upstream-not-ancestor',
2437 "upstream ($upstream) is not an ancestor of HEAD";
2439 my $wrong = cmdoutput
2440 (@git, qw(rev-list --ancestry-path), "$upstream..HEAD",
2441 qw(-- :/ :!/debian));
2442 if (length $wrong) {
2443 snag 'unexpected-upstream-changes',
2444 "history between upstream ($upstream) and HEAD contains direct changes to upstream files - are you sure this is a gbp (patches-unapplied) branch?";
2445 print STDERR "list expected changes with: git log --stat --ancestry-path $upstream_spec..HEAD -- :/ ':!/debian'\n";
2449 if ((git_cat_file "$upstream:debian")[0] ne 'missing') {
2450 snag 'upstream-has-debian',
2451 "upstream ($upstream) contains debian/ directory";
2454 check_series_has_all_patches $old_head;
2456 my $previous_dgit_view = eval {
2457 my @clogcmd = qw(dpkg-parsechangelog --format rfc822 -n2);
2459 parsechangelog_loop \@clogcmd, 'debian/changelog', sub {
2460 my ($stz, $desc) = @_;
2461 no warnings qw(exiting);
2462 printdebug 'CHANGELOG ', Dumper($desc, $stz);
2463 next unless $stz->{Date};
2464 next unless $stz->{Distribution} ne 'UNRELEASED';
2465 $lvsn = $stz->{Version};
2466 $suite = $stz->{Distribution};
2469 die "neither of the first two changelog entries are released\n"
2470 unless defined $lvsn;
2471 print "last finished-looking changelog entry: ($lvsn) $suite\n";
2472 my $mtag_pat = debiantag_maintview $lvsn, '*';
2473 my $mtag = cmdoutput @git, qw(describe --always --abbrev=0 --match),
2475 die "could not find suitable maintainer view tag $mtag_pat\n"
2476 unless $mtag =~ m{/};
2477 is_fast_fwd $mtag, 'HEAD' or
2478 die "HEAD is not FF from maintainer tag $mtag!";
2479 my $dtag = "archive/$mtag";
2480 git_get_ref "refs/tags/$dtag" or
2481 die "dgit view tag $dtag not found\n";
2482 is_fast_fwd $mtag, $dtag or
2483 die "dgit view tag $dtag is not FF from maintainer tag $mtag\n";
2484 print "will stitch in dgit view, $dtag\n";
2485 git_rev_parse $dtag;
2487 if (!$previous_dgit_view) {
2491 Cannot confirm dgit view: $@
2492 Failed to stitch in dgit view (see messages above).
2493 dgit --overwrite will be needed on the first dgit push after conversion.
2497 snags_maybe_bail_early();
2503 runcmd @git, qw(checkout -q -b gdr-internal), $old_head;
2504 # make a branch out of the patch queue - we'll want this in a mo
2505 runcmd qw(gbp pq import);
2506 # strip the patches out
2507 runcmd @git, qw(checkout -q gdr-internal~0);
2508 rm_subdir_cached 'debian/patches';
2509 $work = make_commit ['HEAD'], [
2510 'git-debrebase convert-from-gbp: drop patches from tree',
2511 'Delete debian/patches, as part of converting to git-debrebase format.',
2512 '[git-debrebase convert-from-gbp: drop patches from tree]'
2514 # make the anchor merge
2515 # the tree is already exactly right
2516 $work = make_commit [$work, $upstream], [
2517 'git-debrebase import: declare upstream',
2518 'First breakwater merge.',
2519 '[git-debrebase anchor: declare upstream]'
2522 # rebase the patch queue onto the new breakwater
2523 runcmd @git, qw(reset --quiet --hard patch-queue/gdr-internal);
2524 runcmd @git, qw(rebase --quiet --onto), $work, qw(gdr-internal);
2525 $work = git_rev_parse 'HEAD';
2527 if ($previous_dgit_view) {
2528 $work = make_commit [$work, $previous_dgit_view], [
2529 'git-debrebase import: declare ff from dgit archive view',
2530 '[git-debrebase pseudomerge: import-from-gbp]',
2537 update_head_checkout $old_head, $work, 'convert-from-gbp';
2538 print <<END or die $!;
2539 git-debrebase: converted from patched-unapplied (gbp) branch format, OK
2543 sub cmd_convert_to_gbp () {
2544 badusage "no arguments allowed" if @ARGV;
2545 my $head = get_head();
2546 my (undef, undef, undef, $ffq, $gdrlast) = ffq_prev_branchinfo();
2547 keycommits $head, 0;
2549 make_patches_staged $head;
2551 $out = make_commit ['HEAD'], [
2552 'Commit patch queue (converted from git-debrebase format)',
2553 '[git-debrebase convert-to-gbp: commit patches]',
2557 push @deferred_updates, "delete $ffq";
2558 push @deferred_updates, "delete $gdrlast";
2561 update_head_checkout $head, $out, "convert to gbp (v0)";
2562 print <<END or die $!;
2563 git-debrebase: converted to git-buildpackage branch format
2564 git-debrebase: WARNING: do not now run "git-debrebase" any more
2565 git-debrebase: WARNING: doing so would drop all upstream patches!
2569 sub cmd_convert_from_dgit_view () {
2570 my $clogp = parsechangelog();
2572 my $bpd = (cfg 'dgit.default.build-products-dir',1) // '..';
2578 getoptions("convert-from-dgit-view",
2579 'diagnose!', \$diagnose,
2580 'build-products-dir:s', \$bpd,
2581 'origs!', \$do_origs,
2583 'always-convert-anyway!', \$always);
2584 fail "takes 1 optional argument, the upstream commitish" if @ARGV>1;
2589 my $spec = shift @ARGV;
2590 my $commit = git_rev_parse "$spec^{commit}";
2591 push @upstreams, { Commit => $commit,
2592 Source => "$ARGV[0], from command line",
2597 my $head = get_head();
2601 my $trouble = sub { $troubles++; };
2602 keycommits $head, sub{}, sub{}, $trouble, $trouble;
2603 printdebug "troubles=$troubles\n";
2606 $us: Branch already seems to be in git-debrebase format!
2607 $us: --always-convert-anyway would do the conversion operation anyway
2608 $us: but is probably a bad idea. Probably, you wanted to do nothing.
2610 fail "Branch already in git-debrebase format." unless $opt_noop_ok;
2615 check_series_has_all_patches $head;
2617 snags_maybe_bail_early();
2619 my $version = upstreamversion $clogp->{Version};
2620 print STDERR "Considering possible commits corresponding to upstream:\n";
2625 my $ups_tag = upstream_commitish_search $version, \@tried;
2627 my $this = "git tag $tried[-1]";
2628 push @upstreams, { Commit => $ups_tag,
2633 " git tag: no suitable tag found (tried %s)\n",
2638 my $p = $clogp->{'Source'};
2639 # we do a quick check to see if there are plausible origs
2641 if (!opendir BPD, $bpd) {
2642 die "$bpd: opendir: $!" unless $!==ENOENT;
2644 while ($!=0, my $f = readdir BPD) {
2645 next unless is_orig_file_of_p_v $f, $p, $version;
2647 " orig: found what looks like a .orig, %s\n",
2652 die "read $bpd: $!" if $!;
2656 my $tree = cmdoutput
2657 @dgit, qw(--build-products-dir), $bpd,
2658 qw(print-unapplied-treeish);
2661 runcmd @git, qw(reset --quiet), $tree, qw(-- .);
2662 rm_subdir_cached 'debian';
2663 $tree = cmdoutput @git, qw(write-tree);
2664 my $ups_synth = make_commit [], [ <<END, <<END,
2665 Import effective orig tree for upstream version $version
2667 This includes the contents of the .orig(s), minus any debian/ directory.
2669 [git-debrebase import-from-dgit-view upstream-import-convert: $version]
2672 push @upstreams, { Commit => $ups_synth,
2673 Source => "orig(s) imported via dgit",
2678 " orig: no suitable origs found (looked for %s in %s)\n",
2679 "${p}_".(stripeoch $version)."...", $bpd;
2684 my $some_patches = stat_exists 'debian/patches/series';
2686 print STDERR "Evaluating possible commits corresponding to upstream:\n";
2689 foreach my $u (@upstreams) {
2693 runcmd @git, qw(reset --quiet), $u->{Commit}, qw(-- .);
2694 runcmd @git, qw(checkout), $u->{Commit}, qw(-- .);
2695 runcmd @git, qw(clean -xdff);
2696 runcmd @git, qw(checkout), $head, qw(-- debian);
2697 if ($some_patches) {
2698 rm_subdir_cached 'debian/patches';
2699 $work = make_commit [ $work ], [
2700 'git-debrebase convert-from-dgit-view: drop upstream changes from breakwater',
2701 "Drop upstream changes, and delete debian/patches, as part of converting\n".
2702 "to git-debrebase format. Upstream changes will appear as commits.",
2703 '[git-debrebase convert-from-dgit-view: drop patches from tree]'
2706 $work = make_commit [ $work, $u->{Commit} ], [
2707 'git-debrebase convert-from-dgit-view: declare upstream',
2708 '(Re)constructed breakwater merge.',
2709 '[git-debrebase anchor: declare upstream]'
2711 runcmd @git, qw(checkout --quiet -b mk), $work;
2712 if ($some_patches) {
2713 runcmd @git, qw(checkout), $head, qw(-- debian/patches);
2714 runcmd @git, qw(reset --quiet);
2715 my @gbp_cmd = (qw(gbp pq import));
2717 my $gbp_err = "../gbp-pq-err";
2718 @gbp_cmd = shell_cmd "exec >$gbp_err 2>&1", @gbp_cmd;
2720 my $r = system @gbp_cmd;
2723 " %s: couldn't apply patches: gbp pq %s",
2724 $u->{Source}, waitstatusmsg();
2728 my $work = git_rev_parse qw(HEAD);
2729 my $diffout = cmdoutput @git, qw(diff-tree --stat HEAD), $work;
2730 if (length $diffout) {
2732 " $u->{Source}: applying patches gives different tree\n";
2733 print STDERR $diffout if $diagnose;
2737 $u->{Result} = $work;
2745 Could not find or construct a suitable upstream commit.
2746 Rerun adding --diagnose after convert-from-dgit-view, or pass a
2747 upstream commmit explicitly or provide suitable origs.
2751 printf STDERR "Yes, will base new branch on %s\n", $result->{Source};
2753 ffq_check $result->{Result};
2755 update_head_checkout $head, $result->{Result},
2756 'convert-from-dgit-view';
2759 sub cmd_record_resolved_merge () {
2760 badusage "record-resolved-merge takes no further arguments" if @ARGV;
2761 # xxx needs documentation
2762 my $new = get_head();
2765 print "Checking how you have resolved the merge problem\n";
2766 my $nope = sub { print "Not $method: @_"; 0; };
2768 my $maybe = sub { print "Seems to be $method.\n"; };
2770 my ($key, $ref) = @_;
2771 reflog_cache_insert $merge_cache_ref, $key, $ref;
2772 print "OK. You can switch branches and try git-debrebase again.\n";
2776 fresh_workarea 'merge';
2778 $method = 'vanilla-merge patchqueue';
2779 my $vanilla = git_get_ref "$wrecknoteprefix/vanilla-merge";
2780 $vanilla or return $nope->("wreckage was not of vanilla-merge");
2781 foreach my $lr (qw(left right)) {
2782 my $n = "$wrecknoteprefix/$lr-patchqueue";
2783 my $lrpq = git_get_ref $n;
2784 $lrpq or return $nope->("wreckage did not contain patchqueues");
2785 is_fast_fwd $lrpq, $new or return $nope->("HEAD not ff of $n");
2788 my $newbase = git_get_ref "$wrecknoteprefix/new-base"
2789 or die "wreckage element $wrecknoteprefix/new-base missing";
2790 my $result = merge_series_patchqueue_convert
2792 $yes->("vanilla-merge $vanilla", $result);
2795 fail "No resolved merge method seems applicable.\n";
2799 sub cmd_downstream_rebase_launder_v0 () {
2800 badusage "needs 1 argument, the baseline" unless @ARGV==1;
2802 $base = git_rev_parse $base;
2803 my $old_head = get_head();
2804 my $current = $old_head;
2807 if ($current eq $base) {
2808 $topmost_keep //= $current;
2809 print " $current BASE stop\n";
2812 my $cl = classify $current;
2813 print " $current $cl->{Type}";
2815 my $p0 = $cl->{Parents}[0]{CommitId};
2817 if ($cl->{Type} eq 'Pseudomerge') {
2818 print " ^".($cl->{Contributor}{Ix}+1);
2819 $next = $cl->{Contributor}{CommitId};
2820 } elsif ($cl->{Type} eq 'AddPatches' or
2821 $cl->{Type} eq 'Changelog') {
2831 $topmost_keep //= $current;
2833 die "to-be stripped changes not on top of the branch\n"
2838 if ($topmost_keep eq $old_head) {
2839 print "unchanged\n";
2841 print "updating to $topmost_keep\n";
2842 update_head_checkout
2843 $old_head, $topmost_keep,
2844 'downstream-rebase-launder-v0';
2850 "D+" => \$debuglevel,
2851 'noop-ok', => \$opt_noop_ok,
2852 'f=s' => \@snag_force_opts,
2853 'anchor=s' => \@opt_anchors,
2854 '--dgit=s' => \($dgit[0]),
2857 my ($opt,$val) = @_;
2858 badusage "git-debrebase: no cuddling to -i for git-rebase"
2860 die if $opt_defaultcmd_interactive; # should not happen
2861 $opt_defaultcmd_interactive = [ qw(-i) ];
2862 # This access to @ARGV is excessive familiarity with
2863 # Getopt::Long, but there isn't another sensible
2864 # approach. '-i=s{0,}' does not work with bundling.
2865 push @$opt_defaultcmd_interactive, @ARGV;
2868 'help' => sub { print $usage_message or die $!; finish 0; },
2871 initdebug('git-debrebase ');
2872 enabledebug if $debuglevel;
2874 my $toplevel = cmdoutput @git, qw(rev-parse --show-toplevel);
2875 chdir $toplevel or die "chdir $toplevel: $!";
2877 $rd = fresh_playground "$playprefix/misc";
2879 @opt_anchors = map { git_rev_parse $_ } @opt_anchors;
2881 if (!@ARGV || $opt_defaultcmd_interactive || $ARGV[0] =~ m{^-}) {
2882 defaultcmd_rebase();
2884 my $cmd = shift @ARGV;
2887 $cmdfn = ${*::}{"cmd_$cmdfn"};
2889 $cmdfn or badusage "unknown git-debrebase sub-operation $cmd";