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|
#! /bin/sh
# smart patch applier
# Copyright (C) 1999, 2001 Henry Spencer.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# patcher [-v] [-c] targetdir target [ key patchfile ] ...
# In targetdir, patch target from patchfile unless it already contains
# key and it appears to have been patched with the same patch. (If the
# patch has changed, undo the old one and then put the new one in.) Save
# original as target.preipsec, and patched copy as target.wipsec, with
# patch md5sum stored as target.ipsecmd5. If the patch doesn't work,
# put the original back and save the patch attempt as target.mangled.
# If there are no key+patchfile pairs, undo any old patch and leave it
# at that.
# -v means verbose
# -c means do "patching" by appending rather than by using patch(1)
#
# RCSID $Id: patcher,v 1.1 2004/03/15 20:35:27 as Exp $
PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin
export PATH
umask 022
verbose=
modifier=patch
for dummy
do
case "$1" in
-v) verbose=yes ;;
-c) modifier=cat ;;
--) shift ; break ;;
-*) echo "$0: unknown option \`$1'" >&2 ; exit 2 ;;
*) break ;;
esac
shift
done
if test $# -lt 2
then
echo "Usage: $0 [-v] [-c] targetdir target [ key patchfile ] ..." >&2
exit 2
fi
need() {
if test ! -f $1
then
echo "$0: cannot find file \`$1'" >&2
exit 1
fi
}
note() {
if test "$verbose"
then
echo "* $1"
fi
}
dir="$1"
target="$2"
shift ; shift
it=$dir/$target
need $it
patches=
if test ! -s $it.ipsecmd5
then
# no records of patching...
while test $# -ge 2
do
key="$1"
patchfile="$2"
shift ; shift
need $patchfile
if egrep -q "$key" $it
then
# patched but no record of how
note "$it no longer needs patch $patchfile"
else
patches="$patches $patchfile"
fi
done
elif test ! -f $it.preipsec -o ! -f $it.wipsec
then
echo "$0: $it.preipsec or .wipsec is missing!" >&2
exit 1
else
# determine whether patches have changed
tmp=/tmp/patcher.$$
>$tmp
while test $# -ge 2
do
key="$1"
patchfile="$2"
shift ; shift
need $patchfile
md5sum $patchfile | awk '{print $1}' >>$tmp
if egrep -q "$key" $it.preipsec
then
note "$it no longer needs patch $patchfile"
else
patches="$patches $patchfile"
fi
done
if cmp -s $tmp $it.ipsecmd5
then
note "$it already fully patched"
rm -f $tmp
exit 0
fi
rm -f $tmp
# must undo old patch(es)
note "$it old patches must be undone, undoing them..."
if ! cmp -s $it $it.wipsec
then
note "$it has changed, cannot undo old patches!"
echo "$0: cannot unpatch $it, it has changed since patching" >&2
exit 1
fi
rm $it
mv $it.preipsec $it
rm $it.wipsec $it.ipsecmd5
fi
# if no necessary patches, we're done
if test " $patches" = " "
then
note "$it no longer needs patching"
exit 0
fi
# try to figure out patch options
if test " $modifier" = " patch"
then
if patch --help >/dev/null 2>/dev/null
then
# looks like a modern version
popts='-p1 -b'
else
# looks like an old one
popts='-p1'
fi
fi
# do it
>$it.ipsecmd5
for patchfile in $patches
do
note "applying $patchfile to $it..."
# make local copy - this defeats hard and soft links
mv $it $it.preipsec || exit 0
rm -f $it
cp -p $it.preipsec $it
case "$modifier" in
patch) ( cd $dir ; patch $popts ) <$patchfile ;;
cat) cat $patchfile >>$it ;;
esac
status=$?
if test $status -ne 0
then
note "$it patch failed, restoring original"
echo "$0: patch on $it failed!" >&2
echo "$0: restoring original $it," >&2
echo "$0: leaving patch attempt in $it.mangled" >&2
mv $it $it.mangled
mv $it.preipsec $it
rm -f $it.ipsecmd5
exit 1
fi
rm -f $it.orig # some patch versions leave debris
md5sum $patchfile | awk '{print $1}' >>$it.ipsecmd5
done
cp -p $it $it.wipsec
|
