#!/bin/sh
#
-# This is the git merge script, called with
+# Copyright (c) Linus Torvalds, 2005
#
-# $1 - original file (or empty string)
-# $2 - file in branch1 (or empty string)
-# $3 - file in branch2 (or empty string)
+# This is the git per-file merge script, called with
+#
+# $1 - original file SHA1 (or empty)
+# $2 - file in branch1 SHA1 (or empty)
+# $3 - file in branch2 SHA1 (or empty)
# $4 - pathname in repository
+# $5 - orignal file mode (or empty)
+# $6 - file in branch1 mode (or empty)
+# $7 - file in branch2 mode (or empty)
+#
+# Handle some trivial cases.. The _really_ trivial cases have
+# been handled already by git-read-tree, but that one doesn't
+# do any merges that might change the tree layout.
+
+case "${1:-.}${2:-.}${3:-.}" in
+#
+# Deleted in both or deleted in one and unchanged in the other
#
+"$1.." | "$1.$1" | "$1$1.")
+ echo "Removing $4"
+ rm -f -- "$4" &&
+ exec git-update-cache --remove -- "$4"
+ ;;
+
#
-# Case 1: file removed in both
+# Added in one.
#
-if [ -z "$2$3" ]; then
- rm -- "$4"
- update-cache --remove -- "$4"
- exit 0
-fi
+".$2." | "..$3" )
+ echo "Adding $4"
+ git-update-cache --add --cacheinfo "$6$7" "$2$3" "$4" &&
+ exec git-checkout-cache -u -f -- "$4"
+ ;;
+
#
-# Case 2: file exists in just one
+# Added in both (check for same permissions).
#
-if [ "$2$3" == "$3$2" ]; then
- cat "$2$3" > "$4"
- update-cache --add -- "$4"
- exit 0
-fi
+".$3$2")
+ if [ "$6" != "$7" ]; then
+ echo "ERROR: File $4 added identically in both branches,"
+ echo "ERROR: but permissions conflict $6->$7."
+ exit 1
+ fi
+ echo "Adding $4"
+ git-update-cache --add --cacheinfo "$6" "$2" "$4" &&
+ exec git-checkout-cache -u -f -- "$4"
+ ;;
+
#
-# 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=`git-unpack-file $1`
+ src2=`git-unpack-file $3`
+
+ # We reset the index to the first branch, making
+ # git-diff-file useful
+ git-update-cache --add --cacheinfo "$6" "$2" "$4"
+ git-checkout-cache -u -f -- "$4" &&
+ merge "$4" "$orig" "$src2"
+ ret=$?
+ rm -f -- "$orig" "$src2"
+
+ if [ "$6" != "$7" ]; then
+ echo "ERROR: Permissions conflict: $5->$6,$7."
+ ret=1
+ fi
+
+ if [ $ret -ne 0 ]; then
+ echo "ERROR: Merge conflict in $4."
+ exit 1
+ fi
+ exec git-update-cache -- "$4"
+ ;;
+
+*)
+ echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
+ ;;
+esac
+exit 1