git/git-apply-patch-script

#!/bin/sh
# Copyright (C) 2005 Junio C Hamano
#
# Applying diff between two trees to the work tree can be
# done with the following single command:
#
# GIT_EXTERNAL_DIFF=git-apply-patch-script git-diff-tree -p $tree1 $tree2
#

case "$#" in
2)    exit 1 ;; # do not feed unmerged diff to me!
esac
name="$1" tmp1="$2" hex1="$3" mode1="$4" tmp2="$5" hex2="$6" mode2="$7"
case "$mode1" in *7??) mode1=+x ;; *6??) mode1=-x ;; esac
case "$mode2" in *7??) mode2=+x ;; *6??) mode2=-x ;; esac

if test -f "$name.orig" || test -f "$name.rej"
then
    echo >&2 "Unresolved patch conflicts in the previous run found."
    exit 1
fi
# This will say "patching ..." so we do not say anything outselves.

diff -u -L "a/$name" -L "b/$name" "$tmp1" "$tmp2" | patch -p1
test -f "$name.rej" || {
    case "$mode1,$mode2" in
    .,?x)
	# newly created
	case "$mode2" in
	+x)
	    echo >&2 "created $name with mode +x."
	    chmod "$mode2" "$name"
	    ;;
	-)
	    echo >&2 "created $name."
	    ;;
	esac
	git-update-cache --add -- "$name"
	;;
    ?x,.)
	# deleted
	echo >&2 "deleted $name."
	rm -f "$name"
	git-update-cache --remove -- "$name"
	;;
    *)
	# changed
	case "$mode1,$mode2" in
	"$mode2,$mode1") ;;
	*)
	    echo >&2 "changing mode from $mode1 to $mode2."
	    chmod "$mode2" "$name"
	    ;;
	esac
    esac
    # This bit is debatable---the SCM may not want to keep
    # cache in sync with the work tree (JIT does want to).
    git-update-cache -- "$name"
}
exit 0