git-commit-vandalism/git-merge-one-file-script
Linus Torvalds e3b4be7f6c 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".
2005-04-18 14:17:58 -07:00

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#!/bin/sh
#
# This is the git merge script, called with
#
# $1 - original file SHA1 (or empty)
# $2 - file in branch1 SHA1 (or empty)
# $3 - file in branch2 SHA1 (or empty)
# $4 - pathname in repository
#
#
# Handle some trivial cases.. The _really_ trivial cases have
# been handled already by read-tree, but that one doesn't
# do any merges that migth change the tree layout
#
case "${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
;;
#
# added in one, or added identically in both
#
".$2." | "..$3" | ".$2$2")
mv $(unpack-file "${2:-$3}") $4
update-cache --add -- $4
exit 0
;;
#
# Modified in both, but differently ;(
#
"$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