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#!/bin/bash
# flxfix 0.2 - 2005/04/17 - Willy Tarreau <willy@ant-computing.com>
# Generates a shell script from a difference between two trees so that the last
# one becomes as close to the first one as possible. Second usage is to rebuild
# all the meta-data from a signature.
#
# usage:
# flx check <reference> <tobefixed> | flxfix [ -R ] > fix.sh
# Use -R to swap the two trees
# flx sign <reference> | flxfix -n > create.sh
# Generates a shell script which rebuilds the meta-data from the tree's
# signature.
#
# WARNING: this script does not understand flx-0.7's extended encoding of
# unprintable characters.
entryisdiff=1
restoredate=1
unset mustswap ignoreuid
# usage : fixperms $perm $uid $gid $date $name
function fixperms {
echo touch ${restoredate:+-t \"$(date -d "Jan 1 00:00:$4 UTC 1970" +"%Y%m%d%H%M.%S" )\"} $5
[ -z "$ignoreuid" ] && echo chown $2:$3 $5
echo chmod $1 $5
}
# swap diff direction : -/+, </>
function swap {
local x
x=${1/</.}; x=${x/>/<}; x=${x/./>}
x=${x/-/.}; x=${x/+/-}; x=${x/./+}
echo -n $x
}
# usage: usage progname exitcode
function usage {
echo "$1: Generates a script to rebuild the meta-data from an flx signature"
echo "Usage:"
echo " flx check <reference> <tobefixed> | $1 > fix.sh"
echo " flx check <tobefixed> <reference> | $1 -R > fix.sh"
echo " flx sign <reference> | $1 -n > new.sh"
echo " cat old-signature.lst | $1 -n > new.sh"
echo ""
echo "Options:"
echo " -R swap the two trees"
echo " -n recreate a new tree from a single signature"
echo " -t do not restore timestamp"
echo " -u do not restore uid/gid"
exit $2
}
while [ $# -gt 0 ]; do
if [ "x$1" = "x-R" ]; then
mustswap=1
elif [ "x$1" = "x-n" ]; then
unset entryisdiff
elif [ "x$1" = "x-u" ]; then
ignoreuid=1
elif [ "x$1" = "x-t" ]; then
unset restoredate
elif [ "x$1" = "x-h" ]; then
usage "${0##*/}" 0
else
echo "Warning: ignoring unknown option: $1"
usage "${0##*/}" 1
fi
shift
done
# trick: we only reference the 'chg' variable if 'entryisdiff' is set.
while read ${entryisdiff:+chg} type perm uid gid size sign date name link rest; do
if [ -z "$entryisdiff" ]; then
chg='-'
elif [ -n "$mustswap" ]; then
chg=$(swap $chg)
fi
if [ "x$rest" != "x" -o "x$type" != "xl" -a "x$link" != "x" ]; then
echo "# Ignoring too long line : $REPLY"
continue
elif [ "x$name" = "x" -o "x$type" = "xl" -a "x$link" = "x" ]; then
echo "# Ignoring too short line : $REPLY"
continue
fi
if [ x$chg = x+ ]; then
# new entry which wasn't in <reference>, should be removed
if [ x$type = xd ]; then
# theorically, we should use rm -rf to suppress all children
echo rmdir $name
else
echo rm -f $name
fi
elif [ x$chg = x- ]; then
# missing entry, sometimes we can rebuild them
if [ x$type = xl ]; then
# we'll rebuild a symbolic link
echo ln -s $link $name
[ -z "$ignoreuid" ] && echo chown -h $uid:$gid $name
elif [ x$type = xd ]; then
# we'll rebuild a directory
echo mkdir -p $name
fixperms $perm $uid $gid $date $name
elif [ x$type = x- ]; then
if [ x$size = x0 ]; then
# we can also rebuild files, only if they are empty
fixperms $perm $uid $gid $date $name
else
echo "echo \"Cannot create missing file $name ($size bytes).\""
fi
elif [ x$type = xc -o x$type = xb -o x$type = xf ]; then
# we'll rebuild nodes
echo mknod $name ${type/f/p} ${size/,/ }
fixperms $perm $uid $gid $date $name
else
echo "echo \"Cannot fix $name, unsupported file type : $type\""
fi
elif [ x$chg = x\< ]; then
# entry has changed
if [ x$type = xl ]; then
# we'll destroy and rebuild a symbolic link
echo rm -f $name
echo ln -s $link $name
[ -z "$ignoreuid" ] && echo chown -h $uid:$gid $name
elif [ x$type = xc -o x$type = xb -o x$type = xf ]; then
# we'll destroy and rebuild nodes
echo rm -f $name
echo mknod $name ${type/f/p} ${size/,/ }
fixperms $perm $uid $gid $date $name
else
# in other cases, we only try to fix perms
fixperms $perm $uid $gid $date $name
fi
fi
done
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