merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 4 insertions, 4 deletions

diff --git a/third_party/git/perl/Git/SVN/Editor.pm b/third_party/git/perl/Git/SVN/Editor.pm
index 0df16ed72688..c961444d4cbb 100644
--- a/third_party/git/perl/Git/SVN/Editor.pm
+++ b/third_party/git/perl/Git/SVN/Editor.pm
@@ -63,7 +63,7 @@ sub generate_diff {
 	my @mods;
 	while (defined($_ = get_record($diff_fh, "\0"))) {
 		if ($state eq 'meta' && /^:(\d{6})\s(\d{6})\s
-					($::sha1)\s($::sha1)\s
+					($::oid)\s($::oid)\s
 					([MTCRAD])\d*$/xo) {
 			push @mods, {	mode_a => $1, mode_b => $2,
 					sha1_a => $3, sha1_b => $4,
@@ -400,12 +400,12 @@ sub T {
 	    ($m->{mode_b} !~ /^120/ && $m->{mode_a} =~ /^120/)) {
 		$self->D({
 			mode_a => $m->{mode_a}, mode_b => '000000',
-			sha1_a => $m->{sha1_a}, sha1_b => '0' x 40,
+			sha1_a => $m->{sha1_a}, sha1_b => '0' x $::oid_length,
 			chg => 'D', file_b => $m->{file_b}
 		}, $deletions);
 		$self->A({
 			mode_a => '000000', mode_b => $m->{mode_b},
-			sha1_a => '0' x 40, sha1_b => $m->{sha1_b},
+			sha1_a => '0' x $::oid_length, sha1_b => $m->{sha1_b},
 			chg => 'A', file_b => $m->{file_b}
 		}, $deletions);
 		return;
@@ -434,7 +434,7 @@ sub _chg_file_get_blob ($$$$) {
 		$self->change_file_prop($fbat,'svn:special',undef);
 	}
 	my $blob = $m->{"sha1_$which"};
-	return ($fh,) if ($blob =~ /^0{40}$/);
+	return ($fh,) if ($blob =~ /^0+$/);
 	my $size = $::_repository->cat_blob($blob, $fh);
 	croak "Failed to read object $blob" if ($size < 0);
 	$fh->flush == 0 or croak $!;