git-commit-vandalism/git-merge-one-file-script
James Bottomley 0a9ea85000 [PATCH] SCSI trees, merges and git status
Doing the latest SCSI merge exposed two bugs in your merge script:

1) It doesn't like a completely new directory (the misc tree contains a
   new drivers/scsi/lpfc)
2) the merge testing logic is wrong.  You only want to exit 1 if the
   merge fails.
2005-04-18 19:55:19 -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)
# $4 - pathname in repository
#
#
# Handle some trivial cases.. The _really_ trivial cases have
# been handled already by read-tree, but that one doesn't
# do any merges that migth change the tree layout
#
# if the directory is newly added in a branch, it might not exist
# in the current tree
dir=$(dirname "$4")
mkdir -p "$dir"
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"
if [ $? -ne 0 ]; then
echo Leaving conflict merge in $src2
exit 1
fi
cp "$src2" "$4" && update-cache --add -- "$4" && exit 0
;;
*)
echo "Not handling case $1 -> $2 -> $3"
;;
esac
exit 1