[PATCH 2/2] git-svn: handle merge-base failures

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Change git-svn to warn and continue when merge-base fails while processing svn
merge tickets.

merge-base can fail when a partial branch is created and merged back to trunk
in svn, because it cannot find a common ancestor between the partial branch and
trunk.

Signed-off-by: Andrew Myrick <amyrick@xxxxxxxxx>
---
 git-svn.perl |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/git-svn.perl b/git-svn.perl
index 947184a..1f201e4 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -3158,10 +3158,21 @@ sub find_extra_svn_parents {
 		my $ranges = $ranges{$merge_tip};
 
 		# check out 'new' tips
-		my $merge_base = command_oneline(
-			"merge-base",
-			@$parents, $merge_tip,
-		       );
+		my $merge_base;
+		eval {
+			$merge_base = command_oneline(
+				"merge-base",
+				@$parents, $merge_tip,
+			);
+		};
+		if ($@) {
+			die "An error occurred during merge-base"
+				unless $@->isa("Git::Error::Command");
+
+			warn "W: Cannot find common ancestor between ".
+				"@$parents and $merge_tip. Ignoring merge info.\n";
+			next;
+		}
 
 		# double check that there are no missing non-merge commits
 		my (@incomplete) = check_cherry_pick(
-- 
1.6.6.2.g18c9a

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