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|
#!/bin/sh
# Copyright (c) 2006, 2007
# Thorsten Glaser <tg@mirbsd.de>
# Copyright (c) 2009
# Waldemar Brodkorb <wbx@openadk.org>
#
# Provided that these terms and disclaimer and all copyright notices
# are retained or reproduced in an accompanying document, permission
# is granted to deal in this work without restriction, including un-
# limited rights to use, publicly perform, distribute, sell, modify,
# merge, give away, or sublicence.
#
# This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
# the utmost extent permitted by applicable law, neither express nor
# implied; without malicious intent or gross negligence. In no event
# may a licensor, author or contributor be held liable for indirect,
# direct, other damage, loss, or other issues arising in any way out
# of dealing in the work, even if advised of the possibility of such
# damage or existence of a defect, except proven that it results out
# of said person's immediate fault when using the work as intended.
# Possible return values:
# 0 - everything ok
# 1 - syntax error
# 1 - no 'cfgfs' mtd/cf partition found
# 1 - cfgfs erase: failed
# 1 - cfgfs setup: already run
# 3 - cfgfs setup: mount --bind problems
# 4 - cfgfs setup: can't create or write to temporary filesystem
# 5 - cfgfs setup: can't bind the tmpfs to /etc
# 6 - cfgfs commit: cannot write to partition
# 6 - cfgfs restore: cannot write to partition
# 7 - cfgfs commit: won't write to flash because of unclean setup
# 8 - cfgfs status: differences found
# 9 - cfgfs status: old status file not found
# 10 - cfgfs dump: failed
# 11 - cfgfs commit: cfgfs setup not yet run (use -f to force)
# 11 - cfgfs status: cfgfs setup not yet run
# 12 - cfgfs restore: cannot read the backup
# 255 - cfgfs erase: failed
# 255 - internal error
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
wd=$(pwd)
cd /
what='Configuration Filesystem Utility (cfgfs), Version 1.06'
who=$(id -u)
if [ $who -ne 0 ]; then
echo 'Exit. Configuration Filesystem Utility must be run as root.'
exit 1
fi
usage() {
cat >&2 <<EOF
$what
Usage:
{ halt | poweroff | reboot } [-Ffn] [-d delay]
cfgfs { commit | erase | setup | status | dump | restore } [flags]
EOF
exit 1
}
case $0 in
(*cfgfs*) me=cfgfs ;;
(*halt*) me=halt ;;
(*poweroff*) me=poweroff ;;
(*reboot*) me=reboot ;;
(*) usage ;;
esac
if [[ $me != cfgfs ]]; then
integer dflag=0
dval=
integer fflag=0
integer nocfgfs=0
integer nflag=0
while getopts ":d:Ffn" ch; do
case $ch in
(d) dflag=1; dval=$OPTARG ;;
(F) nocfgfs=1 ;;
(f) fflag=1 ;;
(n) nflag=1 ;;
(*) usage ;;
esac
done
shift $((OPTIND - 1))
(( nocfgfs == 0 && fflag == 0 )) && if ! cfgfs status -q; then
echo "error: will not $me: unsaved changes in /etc found!"
echo "Either run 'cfgfs commit' before trying to $me"
echo "or retry with '$me -F${*+ }$*' to force a ${me}."
echo "Run 'cfgfs status' to see which files are changed."
exit 2
fi
(( fflag )) && me="$me -f"
(( nflag )) && me="$me -n"
(( dflag )) && me="$me -d '$dval'"
eval exec busybox $me
fi
case $1 in
(commit|erase|setup|status|dump|restore) ;;
(*) cat >&2 <<EOF
$what
Syntax:
$0 commit [-f]
$0 erase
$0 setup [-N]
$0 status [-rq]
$0 { dump | restore } [<filename>]
EOF
exit 1 ;;
esac
# find backend device, first try to find partition with ID 88
mtd=0
part=$(fdisk -l|awk '$5 == 88 { print $1 }')
if [ -z $part ]; then
# otherwise search for MTD device with name cfgfs
part=/dev/mtd$(fgrep '"cfgfs"' /proc/mtd 2>/dev/null | sed 's/^mtd\([^:]*\):.*$/\1/')ro
mtd=1
fi
if [[ ! -e $part ]]; then
echo 'cfgfs: fatal error: no "cfgfs" partition found!'
exit 1
fi
if test $1 = erase; then
dd if="$part" 2>&1 | md5sum 2>&1 >/dev/urandom
if [ $mtd -eq 1 ]; then
cfgfs.helper -Me | mtd -F write - cfgfs
else
cfgfs.helper -Me | cat > $part
fi
exit $?
fi
if test $1 = setup; then
if test -e /tmp/.cfgfs; then
echo 'cfgfs: error: "cfgfs setup" already run!'
exit 1
fi
mkdir /tmp/.cfgfs
if test ! -d /tmp/.cfgfs; then
echo 'cfgfs: error: cannot create temporary directory!'
exit 4
fi
chown 0:0 /tmp/.cfgfs
chmod 700 /tmp/.cfgfs
mkdir /tmp/.cfgfs/root
mount --bind /etc /tmp/.cfgfs/root
mkdir /tmp/.cfgfs/temp
mount -t tmpfs none /tmp/.cfgfs/temp
(cd /tmp/.cfgfs/root; tar cf - .) | (cd /tmp/.cfgfs/temp; tar xpf -)
unclean=0
if [[ $1 = -N ]]; then
unclean=2
else
x=$(dd if="$part" bs=4 count=1 2>/dev/null)
[[ "$x" = "FWCF" ]] || \
if [ $mtd -eq 1 ]; then
cfgfs.helper -Me | mtd -F write - cfgfs
else
cfgfs.helper -Me | cat > $part
fi
if ! cfgfs.helper -U /tmp/.cfgfs/temp <"$part"; then
unclean=1
echo 'cfgfs: error: cannot extract'
echo unclean startup | logger -t 'cfgfs setup'
fi
if test -e /tmp/.cfgfs/temp/.cfgfs_deleted; then
while IFS= read -r file; do
rm -f "/tmp/.cfgfs/temp/$file"
done </tmp/.cfgfs/temp/.cfgfs_deleted
rm -f /tmp/.cfgfs/temp/.cfgfs_deleted
fi
fi
test $unclean = 0 || echo -n >/tmp/.cfgfs/temp/.cfgfs_unclean
rm -f /tmp/.cfgfs/temp/.cfgfs_done
if test -e /tmp/.cfgfs/temp/.cfgfs_done; then
echo 'cfgfs: fatal: this is not Kansas any more'
umount /tmp/.cfgfs/temp
umount /tmp/.cfgfs/root
rm -rf /tmp/.cfgfs
exit 3
fi
echo -n >/tmp/.cfgfs/temp/.cfgfs_done
if test ! -e /tmp/.cfgfs/temp/.cfgfs_done; then
echo 'cfgfs: fatal: cannot write to tmpfs'
umount /tmp/.cfgfs/temp
umount /tmp/.cfgfs/root
rm -rf /tmp/.cfgfs
exit 4
fi
chmod 755 /tmp/.cfgfs/temp
mount --bind /tmp/.cfgfs/temp /etc
if test ! -e /etc/.cfgfs_done; then
umount /etc
echo 'cfgfs: fatal: binding to /etc failed'
if test $unclean = 0; then
echo 'cfgfs: configuration is preserved' \
in /tmp/.cfgfs/temp
else
umount /tmp/.cfgfs/temp
fi
exit 5
fi
umount /tmp/.cfgfs/temp
echo complete, unclean=$unclean | logger -t 'cfgfs setup'
cd /etc
rm -f .rnd
find . -type f | grep -v -e '^./.cfgfs' -e '^./.rnd$' | sort | \
xargs md5sum | sed 's! ./! !' | \
cfgfs.helper -Z - /tmp/.cfgfs/status.asz
exit 0
fi
if test $1 = commit; then
umount /tmp/.cfgfs/temp >/dev/null 2>&1
if test ! -e /tmp/.cfgfs; then
cat >&2 <<-EOF
cfgfs: error: not yet initialised
explanation: "cfgfs setup" was not yet run
EOF
[[ $1 = -f ]] || exit 11
fi
if test -e /etc/.cfgfs_unclean; then
cat >&2 <<-EOF
cfgfs: error: unclean startup (or setup run with -N)!
explanation: during boot, the cfgfs filesystem could not
be extracted; saving the current /etc to flash will
result in data loss; to override this check, remove
the file /etc/.cfgfs_unclean and try again.
EOF
[[ $1 = -f ]] || exit 7
fi
mount -t tmpfs none /tmp/.cfgfs/temp
(cd /etc; tar cf - .) | (cd /tmp/.cfgfs/temp; tar xpf -)
cd /tmp/.cfgfs/temp
find . -type f | grep -v -e '^./.cfgfs' -e '^./.rnd$' | sort | \
xargs md5sum | sed 's! ./! !' | \
cfgfs.helper -Z - /tmp/.cfgfs/status.asz
cd /tmp/.cfgfs/root
rm -f /tmp/.cfgfs/temp/.cfgfs_* /tmp/.cfgfs/temp/.rnd
find /tmp/.cfgfs/temp -type d -empty -delete
find . -type f | while read f; do
f=${f#./}
if [[ ! -e /tmp/.cfgfs/temp/$f ]]; then
[[ $f = .rnd ]] && continue
printf '%s\n' "$f" >>/tmp/.cfgfs/temp/.cfgfs_deleted
continue
fi
x=$(md5sum "$f" 2>/dev/null)
y=$(cd ../temp; md5sum "$f" 2>/dev/null)
[[ "$x" = "$y" ]] && rm "../temp/$f"
done
rv=0
if [ $mtd -eq 1 ]; then
if ! ( cfgfs.helper -M /tmp/.cfgfs/temp | mtd -F write - cfgfs ); then
echo 'cfgfs: error: cannot write to $part!'
rv=6
fi
else
if ! ( cfgfs.helper -M /tmp/.cfgfs/temp | cat > $part ); then
echo 'cfgfs: error: cannot write to $part!'
rv=6
fi
fi
umount /tmp/.cfgfs/temp
exit $rv
fi
if test $1 = status; then
if test ! -e /tmp/.cfgfs; then
cat >&2 <<-EOF
cfgfs: error: not yet initialised
explanation: "cfgfs setup" was not yet run
EOF
[[ $1 = -f ]] || exit 11
fi
rm -f /tmp/.cfgfs/*_status /tmp/.cfgfs/*_files
rflag=0
q=printf # or : (true) if -q
shift
while getopts "rq" ch; do
case $ch in
(r) rflag=1 ;;
(q) q=: ;;
esac
done
shift $((OPTIND - 1))
if test $rflag = 1; then
f=/tmp/.cfgfs/rom_status
cd /tmp/.cfgfs/root
find . -type f | grep -v -e '^./.cfgfs' -e '^./.rnd$' | sort | \
xargs md5sum | sed 's! ./! !' >$f
else
f=/tmp/.cfgfs/status
cfgfs.helper -Zd $f.asz $f || rm -f $f
fi
if [[ ! -e $f ]]; then
echo 'cfgfs: error: old status file not found'
exit 9
fi
cd /etc
find . -type f | grep -v -e '^./.cfgfs' -e '^./.rnd$' | sort | \
xargs md5sum | sed 's! ./! !' >/tmp/.cfgfs/cur_status || exit 255
cd /tmp/.cfgfs
sed 's/^[0-9a-f]* //' <$f >old_files
sed 's/^[0-9a-f]* //' <cur_status >cur_files
# make *_status be of exactly the same length, for benefit of the
# while ... read <old, read <new loop below, and sort it
comm -23 old_files cur_files | while read name; do
echo "<NULL> $name" >>cur_status
done
comm -13 old_files cur_files | while read name; do
echo "<NULL> $name" >>$f
done
# this implementation of sort -o sucks: doesn't do in-place edits
sort -k2 -o sold_status $f
sort -k2 -o snew_status cur_status
gotany=0
while :; do
IFS=' ' read oldsum oldname <&3 || break
IFS=' ' read newsum newname <&4 || exit 255
[[ "$oldname" = "$newname" ]] || exit 255
[[ "$oldsum" = "$newsum" ]] && continue
[[ $gotany = 0 ]] && $q '%-32s %-32s %s\n' \
'MD5 hash of old file' 'MD5 hash of new file' 'filename'
gotany=8
test $q = : && break
$q '%32s %32s %s\n' "$oldsum" "$newsum" "$oldname"
done 3<sold_status 4<snew_status
rm -f /tmp/.cfgfs/*_status /tmp/.cfgfs/*_files
exit $gotany
fi
if test $1 = dump; then
fn=$2
[[ -n $fn ]] || fn=-
rm -rf /tmp/.cfgfs.dump
mkdir -m 0700 /tmp/.cfgfs.dump
cd /tmp/.cfgfs.dump
if ! cat "$part" | cfgfs.helper -UD dump; then
cd /
rm -rf /tmp/.cfgfs.dump
exit 10
fi
dd if=/dev/urandom of=seed bs=256 count=1 >/dev/null 2>&1
tar -cf - dump seed | (cd "$wd"; cfgfs.helper -Z - $fn)
cd /
rm -rf /tmp/.cfgfs.dump
case $fn in
(-) echo "cfgfs: dump to standard output complete."
;;
(*) echo "cfgfs: dump to '$fn' complete."
ls -l "$fn" >&2
;;
esac
exit 0
fi
if test $1 = restore; then
if test -e /tmp/.cfgfs; then
echo 'cfgfs: warning: "cfgfs setup" already run!'
echo 'please reboot after restoring; in no event'
echo 'run "cfgfs commit" to prevent data loss'
echo -n >/etc/.cfgfs_unclean
fi
fn=$2
[[ -n $fn ]] || fn=-
rm -rf /tmp/.cfgfs.restore
mkdir -m 0700 /tmp/.cfgfs.restore
cd /tmp/.cfgfs.restore
if ! (cd "$wd"; cfgfs.helper -Zd "$fn") | tar -xf -; then
cd /
rm -rf /tmp/.cfgfs.restore
exit 12
fi
dd if=seed of=/dev/urandom bs=256 count=1 >/dev/null 2>&1
if test ! -e dump; then
echo 'cfgfs: error: invalid backup'
cd /
rm -rf /tmp/.cfgfs.restore
exit 12
fi
if [ $mtd -eq 1 ]; then
if ! ( cfgfs.helper -MD dump | mtd -F write - cfgfs ); then
echo 'cfgfs: error: cannot write to $part!'
exit 6
fi
else
if ! ( cfgfs.helper -MD dump | cat > $part ); then
echo 'cfgfs: error: cannot write to $part!'
exit 6
fi
fi
cd /
rm -rf /tmp/.cfgfs.restore
case $fn in
(-) echo "cfgfs: restore from standard output complete."
;;
(*) echo "cfgfs: restore from '$fn' complete."
ls -l "$fn" >&2
;;
esac
exit 0
fi
echo 'cfgfs: cannot be reached...'
exit 255
|