[PATCH 14/24] merge script: refuse to merge during merge

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Check MERGE_HEAD and bail out if it exists.  Based on v1.6.3.3~3^2
(refuse to merge during a merge, 2009-06-01).  Without this change,
the scripted merge does not pass t3030.

Cc: Clemens Buchacher <drizzd@xxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
 contrib/examples/git-merge.sh |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/contrib/examples/git-merge.sh b/contrib/examples/git-merge.sh
index 99fe1f2..50042df 100755
--- a/contrib/examples/git-merge.sh
+++ b/contrib/examples/git-merge.sh
@@ -27,6 +27,9 @@ cd_to_toplevel
 test -z "$(git ls-files -u)" ||
 	die "Merge is not possible because you have unmerged files."
 
+! test -e "$GIT_DIR/MERGE_HEAD" ||
+	die 'You have not concluded your merge (MERGE_HEAD exists).'
+
 LF='
 '
 
-- 
1.7.2.1.544.ga752d.dirty

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