* [PATCH] lei_mirror: avoid dir/file conflicts in update-ref
@ 2023-02-10 3:58 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2023-02-10 3:58 UTC (permalink / raw)
To: meta
Using the files ref backend for git, `delete' and `create'
operations for `update-ref --stdin' need to be processed in
separate transactions to avoid conflicts in cases where a file
becomes a directory (or presumably, vice versa).
---
lib/PublicInbox/LeiMirror.pm | 47 +++++++++++++++++++++++++++---------
1 file changed, 35 insertions(+), 12 deletions(-)
diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index afe12bb3..d959b6b6 100644
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -288,6 +288,19 @@ sub upr { # feed `git update-ref --stdin -z' verbosely
print $w "$op ", join("\0", @rest, '') or die "print(w): $!";
}
+sub start_update_ref {
+ my ($fgrp) = @_;
+ pipe(my ($r, $w)) or die "pipe: $!";
+ my $cmd = [ 'git', "--git-dir=$fgrp->{cur_dst}",
+ qw(update-ref --stdin -z) ];
+ my $pack = PublicInbox::OnDestroy->new($$, \&satellite_done, $fgrp);
+ start_cmd($fgrp, $cmd, { 0 => $r, 2 => $fgrp->{lei}->{2} }, $pack);
+ close $r or die "close(r): $!";
+ $fgrp->{dry_run} ? undef : $w;
+}
+
+sub upref_warn { warn "E: close(update-ref --stdin): $! (need git 1.8.5+)\n" }
+
sub fgrp_update {
my ($fgrp) = @_;
return if !keep_going($fgrp);
@@ -299,14 +312,9 @@ sub fgrp_update {
close $srcfh;
my %dst = map { chomp; split(/\0/) } (<$dstfh>);
close $dstfh;
- pipe(my ($r, $w)) or die "pipe: $!";
- my $cmd = [ 'git', "--git-dir=$fgrp->{cur_dst}",
- qw(update-ref --stdin -z) ];
+ my $w = start_update_ref($fgrp) or return;
my $lei = $fgrp->{lei};
- my $pack = PublicInbox::OnDestroy->new($$, \&satellite_done, $fgrp);
- start_cmd($fgrp, $cmd, { 0 => $r, 2 => $lei->{2} }, $pack);
- close $r or die "close(r): $!";
- return if $fgrp->{dry_run};
+ my $ndel;
for my $ref (keys %dst) {
my $new = delete $src{$ref};
my $old = $dst{$ref};
@@ -315,18 +323,33 @@ sub fgrp_update {
upr($lei, $w, 'update', $ref, $new, $old);
} else {
upr($lei, $w, 'delete', $ref, $old);
+ ++$ndel;
}
}
- while (my ($ref, $oid) = each %src) {
- upr($lei, $w, 'create', $ref, $oid);
+ # git's ref files backend doesn't allow directory/file conflicts
+ # between `delete' and `create' ops:
+ if ($ndel && scalar(keys %src)) {
+ $fgrp->{-create_refs} = \%src;
+ } else {
+ while (my ($ref, $oid) = each %src) {
+ upr($lei, $w, 'create', $ref, $oid);
+ }
}
- close($w) or warn "E: close(update-ref --stdin): $! (need git 1.8.5+)\n";
+ close($w) or upref_warn();
}
sub satellite_done {
my ($fgrp) = @_;
- pack_refs($fgrp, $fgrp->{cur_dst});
- run_puh($fgrp);
+ if (my $create = delete $fgrp->{-create_refs}) {
+ my $w = start_update_ref($fgrp) or return;
+ while (my ($ref, $oid) = each %$create) {
+ upr($fgrp->{lei}, $w, 'create', $ref, $oid);
+ }
+ close($w) or upref_warn();
+ } else {
+ pack_refs($fgrp, $fgrp->{cur_dst});
+ run_puh($fgrp);
+ }
}
sub pack_refs {
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2023-02-10 3:58 [PATCH] lei_mirror: avoid dir/file conflicts in update-ref Eric Wong
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