Fix git-svn to handle svn not reporting the md5sum of a file, and test.

Acked-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-svn.perl

@@ -2477,7 +2477,7 @@ sub close_file {
 		$md5->addfile($fh);
 		my $got = $md5->hexdigest;
 		die "Checksum mismatch: $path\n",
-		    "expected: $exp\n    got: $got\n" if ($got ne $exp);
+		    "expected: $exp\n    got: $got\n" if (defined $exp && $got ne $exp);
 		sysseek($fh, 0, 0) or croak $!;
 		if ($fb->{mode_b} == 120000) {
 			sysread($fh, my $buf, 5) == 5 or croak $!;

t/t9112-git-svn-md5less-file.sh

@@ -0,0 +1,45 @@
+test_description='test that git handles an svn repository with missing md5sums'
+
+. ./lib-git-svn.sh
+
+# Loading a node from a svn dumpfile without a Text-Content-Length
+# field causes svn to neglect to store or report an md5sum.  (it will
+# calculate one if you had put Text-Content-Length: 0).  This showed
+# up in a repository creted with cvs2svn.
+
+cat > dumpfile.svn <<EOF
+SVN-fs-dump-format-version: 1
+
+Revision-number: 1
+Prop-content-length: 98
+Content-length: 98
+
+K 7
+svn:log
+V 0
+
+K 10
+svn:author
+V 4
+test
+K 8
+svn:date
+V 27
+2007-05-06T12:37:01.153339Z
+PROPS-END
+
+Node-path: md5less-file
+Node-kind: file
+Node-action: add
+Prop-content-length: 10
+Content-length: 10
+
+PROPS-END
+
+EOF
+
+test_expect_success 'load svn dumpfile' "svnadmin load $rawsvnrepo < dumpfile.svn"
+
+test_expect_success 'initialize git-svn' "git-svn init $svnrepo"
+test_expect_success 'fetch revisions from svn' 'git-svn fetch'
+test_done