Dirk Nehring dixit:
>great to hear about your progress. Do you have an idea how to save the
>config? For the web interface we need a function 'save' and
>'restore'. does it work with a simple dd?
save()
{
part=/dev/mtd/$(fgrep '"fwcf"' /proc/mtd 2>&- | \
sed 's/^mtd\([^:]*\):.*$/\1/')ro
if ! test -e "$part"; then
echo 'error: no "fwcf" mtd partition found!' >&2
exit 1
fi
if test -n "$1"; then
cat "$part" >"$1"
else
cat "$part"
fi
}
restore()
{
cat ${1:+"$1"} | mtd -F write - fwcf
}
# Syntax:
# save [filename]
# restore [filename]
Keep in mind that, if the fwcf major or the compression
format (deflate -> lzo1x) changes, this won't exactly work.
I might add some kind of dump functionality later.
Otherwise you can 'just' tar up /etc to save, and copy
it back followed by an 'fwcf commit' in restore:
save()
{
if test -n "$1"; then
(cd /etc; tar cf - .) | gzip -n9 >"$1"
else
(cd /etc; tar cf - .) | gzip -n9
fi
}
restore()
{
if ! test -e /etc/.fwcf_done; then
echo 'error: fwcf not initialised' >&2
exit 1
fi
cat ${1:+"$1"} | gzip -dc | (cd /etc; tar xphf -)
fwcf commit
}
These two are semantically slightly different. fwcf
only stores the files that differ from the "original"
/etc (in the possibly read-only (squashfs) root, which
is mount --bind'ed to /tmp/.fwcf/root) as well as all
directories and symbolic links, whereas tar stores all
files, not only these which changed. So the second ap-
proach could miss updated files in /etc in the base
image. If you don't want that, use something like
save()
{
wd=$(pwd)
umount /tmp/.fwcf/temp >&- 2>&-
mount -t tmpfs swap /tmp/.fwcf/temp
(cd /etc; tar cf - .) | (cd /tmp/.fwcf/temp; tar xpf -)
cd /tmp/.fwcf/root
find . -type f | while read f; do
x=$(md5sum "${f#./}" 2>&-)
y=$(cd ../temp; md5sum "${f#./}" 2>&-)
test x"$x" = x"$y" && rm "../temp/${f#./}"
done
cd /tmp/.fwcf/temp
if test -n "$1"; then
tar cf - . | gzip -n9 >"$1"
else
tar cf - . | gzip -n9
fi
cd $wd
umount /tmp/.fwcf/temp
}
All these shell functions are untested but should
work with ash on the target. Error checking is
something you'd better implement yourself depending
on your needs.
bye,
//mirabile
--
"Using Lynx is like wearing a really good pair of shades: cuts out
the glare and harmful UV (ultra-vanity), and you feel so-o-o COOL."
-- Henry Nelson, March 1999
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