> On Sat, Jul 12, 2008 at 04:52, Marco d'Itri <md@xxxxxxxx> wrote:
> > I added this to the Debian udev init script, run between mounting /dev
> > and starting udevtrigger.
> >
> > mountpoint at least on Debian systems is part of sysvinit and happens to
> > be in /bin, but if /usr is available then you can as well use stat(1).
> >
> > create_devroot_rule() {
> > local udevroot="$1"
> > local rootnumbers=$(mountpoint -q -d / || true)
> > local rootmajor=${rootnumbers%:*}
> > local rootminor=${rootnumbers#*:}
> > [ "$rootmajor" -a "$rootminor" ] || return 0
> >
> > echo 'ACTION=="add", SUBSYSTEM=="block", ENV{MAJOR}=="'$rootmajor'", ENV{MINOR}=="'$rootminor'",
SYMLINK+="root"' > /dev/.udev/rules.d/rules.d/61-dev-root-link.rules
> > }
Based in original Marco´s code, we are using this one:
# Create rootdev rules
DEVICENUMBER=$( /bin/stat -c %d / )
MAJORNUMBER=$(($DEVICENUMBER / 256))
MINORNUMBER=$(($DEVICENUMBER % 256))
echo 'ACTION=="add", SUBSYSTEM=="block", ENV{MAJOR}=="'$MAJORNUMBER'", ENV{MINOR}=="'$MINORNUMBER'",
SYMLINK+="root"' > /dev/.udev/rules.d/61-dev-root-link.rules
But our uses stat instead mountpoint (mountpoint is in /usr/bin and stat is in /bin)
> Looks fine, didn't know about "mountpoint, and not sure if all distros
> have it. We use:
> udevadm info --device-id-of-file=/
> since a while. I've added --export to it now, so:
> eval $(/sbin/udevadm info --export --export-prefix=ROOT_
> --device-id-of-file=/)
> should make $ROOT_MAJOR, $ROOT_MINOR available without any further
> shell mangling.
Hmmm... seems to be a good idea to use udev internal tools to do that.
Piter Punk
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