git-svn: better attempt to handle broken symlink updates
This is a followup to 7fc35e0e94782bbbefb920875813519038659930,
(workaround a for broken symlinks in SVN).
Since broken SVN clients can commit svn:special files without
the magic "link " prefix, this can affect delta application
when we update the broken svn:special file. So now we fall
back and retry the delta application on symlinks if having
a "link " prefix fails.
Our behavior differs from svn(1) (v1.5.1) slightly:
When a svn:special file is created w/o a "link " prefix, svn
will create a regular file (mode 100644 to git) with the
contents of the blob as-is.
Our behavior is to continue creating the symlink (mode 120000
to git) with the contents of the blob as-is. While this
differs from current svn(1) behavior, this is easier and more
efficient to implement (and the correctness of the svn(1) is
debatable, since it's a workaround for a bug in the first
place).
More information on this SVN bug is described here:
http://subversion.tigris.org/issues/show_bug.cgi?id=2692
Signed-off-by: Eric Wong <normalperson@yhbt.net>
diff --git a/git-svn.perl b/git-svn.perl
index 1b87a65..b0e3d7c 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -3380,19 +3380,35 @@
open my $dup, '<&', $fh or croak $!;
my $base = $::_repository->temp_acquire('git_blob');
if ($fb->{blob}) {
+ my ($base_is_link, $size);
+
if ($fb->{mode_a} eq '120000' &&
! $self->{empty_symlinks}->{$fb->{path}}) {
print $base 'link ' or die "print $!\n";
+ $base_is_link = 1;
}
- my $size = $::_repository->cat_blob($fb->{blob}, $base);
+ retry:
+ $size = $::_repository->cat_blob($fb->{blob}, $base);
die "Failed to read object $fb->{blob}" if ($size < 0);
if (defined $exp) {
seek $base, 0, 0 or croak $!;
my $got = ::md5sum($base);
- die "Checksum mismatch: $fb->{path} $fb->{blob}\n",
- "expected: $exp\n",
- " got: $got\n" if ($got ne $exp);
+ if ($got ne $exp) {
+ my $err = "Checksum mismatch: ".
+ "$fb->{path} $fb->{blob}\n" .
+ "expected: $exp\n" .
+ " got: $got\n";
+ if ($base_is_link) {
+ warn $err,
+ "Retrying... (possibly ",
+ "a bad symlink from SVN)\n";
+ $::_repository->temp_reset($base);
+ $base_is_link = 0;
+ goto retry;
+ }
+ die $err;
+ }
}
}
seek $base, 0, 0 or croak $!;
