104 lines
2.2 KiB
Bash
Executable File
104 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# cowpatch.sh, by Rich Felker
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#
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# Permission to use, copy, modify, and/or distribute this software for
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# any purpose with or without fee is hereby granted.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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# AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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# DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
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# OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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# TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE.
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#
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# Take the above disclaimer seriously! This is an experimental tool
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# still and does not yet take precautions against malformed/malicious
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# patch files like patch(1) does. It may act out-of-tree and clobber
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# stuff you didn't intend for it to clobber.
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#
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set -e
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echo () { printf "%s\n" "$*" ; }
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cow () {
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test -h "$1" || return 0
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if test -d "$1" ; then
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case "$1" in
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*/*) set -- "${1%/*}/" "${1##*/}" ;;
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*) set -- "" "$1" ;;
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esac
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mkdir "$1$2.tmp.$$"
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mv "$1$2" "$1.$2.orig"
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mv "$1$2.tmp.$$" "$1$2"
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( cd "$1$2" && ln -s ../".$2.orig"/* . )
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else
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cp "$1" "$1.tmp.$$"
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mv "$1.tmp.$$" "$1"
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fi
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}
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cowp () {
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while test "$1" ; do
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case "$1" in
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*/*) set -- "${1#*/}" "$2${2:+/}${1%%/*}" ;;
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*) set -- "" "$2${2:+/}$1" ;;
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esac
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cow "$2"
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done
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}
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cowpatch () {
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plev=0
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OPTIND=1
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while getopts ":p:i:RNE" opt ; do
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test "$opt" = p && plev="$OPTARG"
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done
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while IFS= read -r l ; do
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case "$l" in
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+++*)
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IFS=" " read -r junk pfile junk <<EOF
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$l
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EOF
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i=0; while test "$i" -lt "$plev" ; do pfile=${pfile#*/}; i=$((i+1)) ; done
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cowp "$pfile"
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echo "$l"
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;;
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@@*)
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echo "$l"
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IFS=" " read -r junk i j junk <<EOF
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$l
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EOF
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case "$i" in *,*) i=${i#*,} ;; *) i=1 ;; esac
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case "$j" in *,*) j=${j#*,} ;; *) j=1 ;; esac
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while test $i -gt 0 || test $j -gt 0 ; do
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IFS= read -r l
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echo "$l"
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case "$l" in
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+*) j=$((j-1)) ;;
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-*) i=$((i-1)) ;;
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*) i=$((i-1)) ; j=$((j-1)) ;;
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esac
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done ;;
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*) echo "$l" ;;
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esac
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done
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}
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gotcmd=0
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while getopts ":p:i:RNEI:S:" opt ; do
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case "$opt" in
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I) find "$OPTARG" -path "$OPTARG/*" -prune -exec sh -c 'ln -sf "$@" .' sh {} + ; gotcmd=1 ;;
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S) cowp "$OPTARG" ; gotcmd=1 ;;
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esac
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done
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test "$gotcmd" -eq 0 || exit 0
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cowpatch "$@" | patch "$@"
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