[PATCH] git: fix cat_async_retry

[Eric Wong]

Retrying requests on alternates changing was causing inflight
requests to get lost due to {inflight} getting clobbered by
batch_prepare.

Unfortunately, reproducing this is difficult without mocking
->alternates_changed.

SearchIdx now avoids calling ->batch_prepare directly and
relies on more common API functions.

Fixes: 65db62eb006f ("git: use --batch-command in git 2.36+ to save processes")
---
 lib/PublicInbox/Git.pm       | 11 +++++------
 lib/PublicInbox/SearchIdx.pm |  6 +++++-
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index e35d5277..f153237b 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -229,8 +229,7 @@ sub cat_async_retry ($$) {
        delete $self->{inflight};
        cleanup($self);
 
-       $self->{inflight} = $inflight;
-       batch_prepare($self);
+       batch_prepare($self, $inflight);
        my $buf = '';
        for (my $i = 0; $i < @$inflight; $i += 3) {
                $buf .= "$inflight->[$i]\n";
@@ -312,8 +311,8 @@ sub cat_async_wait ($) {
        }
 }
 
-sub batch_prepare ($) {
-       my ($self) = @_;
+sub batch_prepare ($$) {
+       my ($self, $inflight) = @_;
        check_git_exe();
        if ($GIT_VER ge BATCH_CMD_VER) {
                _bidi_pipe($self, qw(batch-command in out pid err_c));
@@ -321,7 +320,7 @@ sub batch_prepare ($) {
        } else {
                _bidi_pipe($self, qw(batch in out pid));
        }
-       $self->{inflight} = [];
+       $self->{inflight} = $inflight;
 }
 
 sub _cat_file_cb {
@@ -581,7 +580,7 @@ sub cat_async_begin {
        my ($self) = @_;
        cleanup($self) if $self->alternates_changed;
        die 'BUG: already in async' if $self->{inflight};
-       batch_prepare($self);
+       batch_prepare($self, []);
 }
 
 sub cat_async ($$$;$) {
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 496cea05..3415cce4 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -1074,7 +1074,11 @@ sub _index_sync {
        my $ibx = $self->{ibx};
        local $self->{current_info} = "$ibx->{inboxdir}";
        $self->{batch_bytes} = $opt->{batch_size} // $BATCH_BYTES;
-       $ibx->git->batch_prepare;
+
+       if ($X->{CLOEXEC_UNSET}) {
+               $ibx->git->cat_file($tip);
+               $ibx->git->check($tip);
+       }
        my $pr = $opt->{-progress};
        my $sync = { reindex => $opt->{reindex}, -opt => $opt, ibx => $ibx };
        my $quit = quit_cb($sync);