Restoring file permissions

After posting in this thread, I remembered I had a copy of an old shell script that restores file permissions on a stock Slackware system.

Might be useful to some folks. The original author is noted in the script.

I never had to use the script and never tested. Might be a decent rainy day exercise to create a VM, chmod 777 the entire system, and test the script. Perhaps a few bored or adventurous Slackers could test the script.

On my system I named the script /usr/local/sbin/restore_fileperms_from_manifest. I think I found the script here at LQ, but many years ago.

Have fun. :)

Code:#!/bin/bash
# Copyright 2005, 2006 CTSMacon LLC., Macon, GA, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

# Howdy folks!
#
# Some one on IRC had their box completely hosed due to someone running a
# "chmod -R 777 /" like a newb, so I banged up this script to fix it.
# Hope y'all enjoy.

# Alan Hicks

# ----------------------------------------------------------------------------
# This script will restore all default permissions on a Slackware box
# This may work with other UNIXs as well, but you'll need a file
# in the same way as a massaged MANIFEST file in Slackware

# You MUST have a file called MANIFEST in the directory you are calling
# this script from that contains a list of all the files you want
# changed and their correct permissions and ownership. This is easily
# done in Slackware by removing all lines that begin with "+" or "|"
# in the file.
#
# The following works fine on Slackware.
#
# bunzip2 MANIFEST.bz2
# mv MANIFEST file
# egrep "^[d-]" file > MANIFEST

(while read line; do

# Tag the filename
PATH_NAME="$( echo $line | awk '{print $6}' )"

# Tag the permissions
FULL_PERM="$(echo $line | cut -c 2-10 )"
OWNER_GROUP="$( echo $line | awk '{print $2}' | sed -e s+/+:+ )"

OWN_PERMS="$(echo $FULL_PERM | cut -c 1-3 )"
GROUP_PERMS="$(echo $FULL_PERM | cut -c 4-6 )"
ALL_PERMS="$(echo $FULL_PERM | cut -c 7-9 )"

# Read in owner permissions (and the suid bit!)
if [ "$( echo $OWN_PERMS | cut -c 1)" = "r" ]; then
READ=4
else
READ=0
fi
if [ "$( echo $OWN_PERMS | cut -c 2)" = "w" ]; then
WRITE=2
else
WRITE=0
fi
if [ "$( echo $OWN_PERMS | cut -c 3)" = "x" ]; then
EXE=1
else
EXE=0
fi
if [ "$( echo $OWN_PERMS | cut -c 3)" = "s" ]; then
SUID=4
EXE=1
else
SUID=0
EXE=0
fi

OWN=$(( $READ + $WRITE + $EXE ))

# Read in group permissions (and the sgid bit!)
if [ "$( echo $GROUP_PERMS | cut -c 1)" = "r" ]; then
READ=4
else
READ=0
fi
if [ "$( echo $GROUP_PERMS | cut -c 2)" = "w" ]; then
WRITE=2
else
WRITE=0
fi
if [ "$( echo $GROUP_PERMS | cut -c 3)" = "x" ]; then
EXE=1
else
EXE=0
fi
if [ "$( echo $GROUP_PERMS | cut -c 3)" = "s" ]; then
EXE=1
SGID=2
else
SGID=0
EXE=0
fi

GROUP=$(( $READ + $WRITE + $EXE ))

# Read in world permissions (and the sticky bit!)
if [ "$( echo $ALL_PERMS | cut -c 1)" = "r" ]; then
READ=4
else
READ=0
fi
if [ "$( echo $ALL_PERMS | cut -c 2)" = "w" ]; then
WRITE=2
else
WRITE=0
fi
if [ "$( echo $ALL_PERMS | cut -c 3)" = "x" ]; then
EXE=1
else
EXE=0
fi
if [ "$( echo $ALL_PERMS | cut -c 3)" = "t" ]; then
STICKY=1
EXE=1
else
STICKY=0
EXE=0
fi

ALL=$(( $READ + $WRITE + $EXE ))

OTHER=$(( $SUID + $SUID + $STICKY ))

echo chmod -R $OTHER$OWN$GROUP$ALL /$PATH_NAME
echo chgrp $OWNER_GROUP /$PATH_NAME

done) < MANIFEST