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#!/bin/sh
#
# Copyright (c) Linus Torvalds, 2005
#
# 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"
;;
#
# Added in one.
#
".$2." | "..$3" )
echo "Adding $4"
git-update-cache --add --cacheinfo "$6$7" "$2$3" "$4" &&
exec git-checkout-cache -u -f -- "$4"
;;
#
# Added in both (check for same permissions).
#
".$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"
;;
#
# Modified in both, but differently.
#
"$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
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