Tool for mounting USB sticks formatted with --statefuldev

Tool for mounting USB sticks formatted with --statefuldev

sosa@'s statefuldev change, which installs all developer packages on
the stateful partition and has put /var there as well, means that we
can no longer just mount the rootfs on a usb stick and emerge packages
onto/off of the removeable device.  We now need to mount the stateful
partition as well, and also bindmount from /var on the rootfs to /var
on the stateful partition.  All portage state is stored there, among
other things.

[sosa, 2010-04-12 14:16:36]

http://codereview.chromium.org/1644001/diff/1/2
File src/scripts/prep_usb.sh (right):

http://codereview.chromium.org/1644001/diff/1/2#newcode11
src/scripts/prep_usb.sh:11: DEFINE_boolean "unmount" $FLAGS_FALSE "umnount USB
partitions" "u"
s/umnount/unmount/

http://codereview.chromium.org/1644001/diff/1/2#newcode28
src/scripts/prep_usb.sh:28: sudo mount -n --bind "${FLAGS_stateful_mountpt}/var"
\
I had previously used -n, but I noticed that unmounts were much less reliable
when there was a reference in mtab

[sosa, 2010-04-12 14:17:01]

s/was/wasn't/ a reference in mtab

[Chris Masone, 2010-04-12 15:34:39]

http://codereview.chromium.org/1644001/diff/1/2
File src/scripts/prep_usb.sh (right):

http://codereview.chromium.org/1644001/diff/1/2#newcode11
src/scripts/prep_usb.sh:11: DEFINE_boolean "unmount" $FLAGS_FALSE "umnount USB
partitions" "u"
On 2010/04/12 14:16:36, sosa wrote:
> s/umnount/unmount/

Done.

http://codereview.chromium.org/1644001/diff/1/2#newcode28
src/scripts/prep_usb.sh:28: sudo mount -n --bind "${FLAGS_stateful_mountpt}/var"
\
On 2010/04/12 14:16:36, sosa wrote:
> I had previously used -n, but I noticed that unmounts were much less reliable
> when there was a reference in mtab

Done.

[sosa, 2010-04-12 15:37:00]

lgtm