path: root/builtin/merge-file.c
diff options
authorJeff King <>2015-10-28 22:44:21 (GMT)
committerJunio C Hamano <>2015-10-29 19:10:23 (GMT)
commite34f80278e920e53b69016c7cecb24e4621e4564 (patch)
tree74ef9ebff60018e37116154b565a6fb87c20c69b /builtin/merge-file.c
parent282616c72d1d08a77ca4fe1186cb708c38408d87 (diff)
merge-file: clamp exit code to maximum 127
Git-merge-file is documented to return one of three exit codes: - zero means the merge was successful - a negative number means an error occurred - a positive number indicates the number of conflicts Unfortunately, this all gets stuffed into an 8-bit return code. Which means that if you have 256 conflicts, this wraps to zero, and the merge appears to succeed (and commits a blob full of conflict-marker cruft!). This patch clamps the return value to a maximum of 127, which we should be able to safely represent everywhere. This also leaves 128-255 for other values. Shells (and some parts of git) will typically represent signal death as 128 plus the signal number. And negative values are typically coerced to an 8-bit unsigned value (so "return -1" ends up as 255). Technically negative returns have the same problem (e.g., "-256" wraps back to 0), but this is not a problem in practice, as the only negative value we use is "-1". Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'builtin/merge-file.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index 844f84f..ab4330a 100644
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -102,5 +102,8 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
+ if (ret > 127)
+ ret = 127;
return ret;