die "You need to first update your working tree."
fi
-merge_head=$(sed -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | tr '\012' ' ')
+merge_head=$(sed -e '/ not-for-merge /d' \
+ -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
+ tr '\012' ' ')
case "$merge_head" in
'')