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#!/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
1)
echo >&2 "cannot handle unmerged diff on path $1."
exit 1 ;;
8)
echo >&2 "cannot handle rename diff between $1 and $8 yet."
exit 1 ;;
esac
name="$1" tmp1="$2" hex1="$3" mode1="$4" tmp2="$5" hex2="$6" mode2="$7"
type1=f
case "$mode1" in
*120???) type1=l ;;
*1007??) mode1=+x ;;
*1006??) mode1=-x ;;
.) type1=- ;;
esac
type2=f
case "$mode2" in
*120???) type2=l ;;
*1007??) mode2=+x ;;
*1006??) mode2=-x ;;
.) type2=- ;;
esac
case "$type1,$type2" in
-,?)
dir=$(dirname "$name")
case "$dir" in '' | .) ;; *) mkdir -p "$dir" ;; esac || {
echo >&2 "cannot create leading path for $name."
exit 1
}
if test -e "$name"
then
echo >&2 "path $name to be created already exists."
exit 1
fi
case "$type2" in
f)
# creating a regular file
cat "$tmp2" >"$name" || {
echo >&2 "cannot create a regular file $name."
exit 1
}
case "$mode2" in
+x)
echo >&2 "created a regular file $name with mode +x."
chmod "$mode2" "$name"
;;
-x)
echo >&2 "created a regular file $name."
;;
esac
;;
l)
# creating a symlink
ln -s "$(cat "$tmp2")" "$name" || {
echo >&2 "cannot create a symbolic link $name."
exit 1
}
echo >&2 "created a symbolic link $name."
;;
*)
echo >&2 "do not know how to create $name of type $type2."
exit 1
esac
git-update-cache --add -- "$name" ;;
?,-)
rm -f "$name" || {
echo >&2 "cannot remove $name"
exit 1
}
echo >&2 "deleted $name."
git-update-cache --remove -- "$name" ;;
l,f|f,l)
echo >&2 "cannot change a regular file $name and a symbolic link $name."
exit 1 ;;
l,l)
# symlink to symlink
current=$(readlink "$name") || {
echo >&2 "cannot read the target of the symbolic link $name."
exit 1
}
original=$(cat "$tmp1")
next=$(cat "$tmp2")
test "$original" != "$current" || {
echo >&2 "cannot apply symbolic link target change ($original->$next) to $name which points to $current."
exit 1
}
if test "$next" != "$current"
then
rm -f "$name" && ln -s "$next" "$name" || {
echo >&2 "cannot create symbolic link $name."
exit 1
}
echo >&2 "changed symbolic target of $name."
git-update-cache -- "$name"
fi ;;
f,f)
# changed
test -e "$name" || {
echo >&2 "regular file $name to be patched does not exist."
exit 1
}
dir=$(dirname "$name")
case "$dir" in '' | .) ;; *) mkdir -p "$dir";; esac || {
echo >&2 "cannot create leading path for $name."
exit 1
}
tmp=.git-apply-patch-$$
trap "rm -f $tmp-*" 0 1 2 3 15
# Be careful, in case "$tmp2" is borrowed path from the work tree
# we are looking at...
diff -u -L "a/$name" -L "b/$name" "$tmp1" "$tmp2" >$tmp-patch
# This will say "patching ..." so we do not say anything outselves.
patch -p1 <$tmp-patch || exit
rm -f $tmp-patch
case "$mode1,$mode2" in
"$mode2,$mode1") ;;
*)
chmod "$mode2" "$name"
echo >&2 "changed mode from $mode1 to $mode2."
;;
esac
git-update-cache -- "$name"
esac
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