Change merge-cache and git-merge-one-file to use the SHA1 of the file
instead of a checked-out temporary copy.
If merging requires a checked-out-copy, we now do so with "unpack-file".
diff --git a/git-merge-one-file-script b/git-merge-one-file-script
index 26dbe63..df1a679 100755
--- a/git-merge-one-file-script
+++ b/git-merge-one-file-script
@@ -2,34 +2,50 @@
#
# This is the git merge script, called with
#
-# $1 - original file (or empty string)
-# $2 - file in branch1 (or empty string)
-# $3 - file in branch2 (or empty string)
+# $1 - original file SHA1 (or empty)
+# $2 - file in branch1 SHA1 (or empty)
+# $3 - file in branch2 SHA1 (or empty)
# $4 - pathname in repository
#
#
-# Case 1: file removed in both
+# Handle some trivial cases.. The _really_ trivial cases have
+# been handled already by read-tree, but that one doesn't
+# do any merges that migth change the tree layout
#
-if [ -z "$2$3" ]; then
- rm -- "$4"
+
+case "${1:-.}${2:-.}${3:-.}" in
+#
+# deleted in both, or deleted in one and unchanged in the other
+#
+"$1.." | "$1.$1" | "$1$1.")
+ rm -f -- "$4"
update-cache --remove -- "$4"
exit 0
-fi
+ ;;
+
#
-# Case 2: file exists in just one
+# added in one, or added identically in both
#
-if [ "$2$3" == "$3$2" ]; then
- cat "$2$3" > "$4"
- update-cache --add -- "$4"
+".$2." | "..$3" | ".$2$2")
+ mv $(unpack-file "${2:-$3}") $4
+ update-cache --add -- $4
exit 0
-fi
+ ;;
+
#
-# Case 3: file exists in both
+# Modified in both, but differently ;(
#
-src="$1"
-if [ -z "$1" ]; then
- src=/dev/null
-fi
-echo "Auto-merging $4"
-cp "$3" "$4"
-merge "$4" "$src" "$2" && update-cache --add -- "$4"
+"$1$2$3")
+ echo "Auto-merging $4"
+ orig=$(unpack-file $1)
+ src1=$(unpack-file $2)
+ src2=$(unpack-file $3)
+ merge "$src2" "$orig" "$src1" || echo Leaving conflict merge in $src2 && exit 1
+ cp "$src2" "$4" && update-cache --add -- "$4" && exit 0
+ ;;
+
+*)
+ echo "Not handling case $1 -> $2 -> $3"
+ ;;
+esac
+exit 1
