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-rw-r--r--lib/PublicInbox/Git.pm7
-rw-r--r--lib/PublicInbox/SolverGit.pm11
2 files changed, 16 insertions, 2 deletions
diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 309f80db..54ceaf0b 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -94,6 +94,13 @@ sub alternates_changed {
         $self->{alt_st} = $st; # always a true value
 }
 
+sub object_format {
+        $_[0]->{object_format} //= do {
+                my $fmt = $_[0]->qx(qw(config extensions.objectformat));
+                $fmt eq "sha256\n" ? \'sha256' : \undef;
+        }
+}
+
 sub last_check_err {
         my ($self) = @_;
         my $fh = $self->{err_c} or return;
diff --git a/lib/PublicInbox/SolverGit.pm b/lib/PublicInbox/SolverGit.pm
index 5d5060f4..62b5a343 100644
--- a/lib/PublicInbox/SolverGit.pm
+++ b/lib/PublicInbox/SolverGit.pm
@@ -293,14 +293,21 @@ sub do_git_init ($) {
                 mkdir("$git_dir/$_") or die "mkdir $_: $!";
         }
         open my $fh, '>', "$git_dir/config" or die "open git/config: $!";
-        print $fh <<'EOF' or die "print git/config $!";
+        my $first = $self->{gits}->[0];
+        my $fmt = $first->object_format;
+        my $v = defined($$fmt) ? 1 : 0;
+        print $fh <<EOF or die "print git/config $!";
 [core]
-        repositoryFormatVersion = 0
+        repositoryFormatVersion = $v
         filemode = true
         bare = false
         fsyncObjectfiles = false
         logAllRefUpdates = false
 EOF
+        print $fh <<EOM if defined($$fmt);
+[extensions]
+        objectformat = $$fmt
+EOM
         close $fh or die "close git/config: $!";
 
         open $fh, '>', "$git_dir/HEAD" or die "open git/HEAD: $!";