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#!/bin/sh
# This script should be installed as /sbin/mount.ubifs. The benefit is that an
# fstab entry like:
#
# mtd=mtddev:home /home ubifs defaults 0 0
#
# results in the ubi contained in the mtd named "mtddev" to be attached (if not
# already done) and then the volume named "home" being mounted to /home.
# This is called by mount with the following options:
# /sbin/mount.ubifs spec dir [-sfnv] [-N namespace] [-o options] [-t type.subtype]
spec="$1"
shift
mtdname2num() {
local name
name="$1"
for d in $(find /sys/class/mtd/ -regex '.*/mtd[0-9]*'); do
case "$d" in
*ro)
continue
;;
esac
if test "$name" = "$(cat "$d/name")"; then
local dev mtdnum
dev="$(basename "$d")"
mtdnum="${dev#mtd}"
echo "$mtdnum"
return
fi
done
return 1
}
mtdnum2ubi() {
local mtdnum
mtdnum="$1"
for d in $(find /sys/class/ubi/ -regex '.*/ubi[0-9]*'); do
case "$d" in
*_[0-9]*)
continue
;;
esac
if test "$mtdnum" = "$(cat "$d/mtd_num")"; then
local ubi
ubi="$(basename "$d")"
echo "$ubi"
return;
fi
done
return 1
}
mtdnum2ubi_autoattach() {
local mtdnum ubi
mtdnum="$1"
ubi="$(mtdnum2ubi "$mtdnum")" && { echo "$ubi"; return; }
# ubiattach might fail with "mtdX is already attached to ubiY" if there
# is more than one mount to do in the same mtd partition. So ignore errors.
ubiattach -m "$mtdnum" >&2 || true
mtdnum2ubi "$mtdnum"
}
case "$spec" in
mtd=*:*)
spec="${spec#mtd=}"
mtd="${spec%:*}"
rspec="${spec#*:}"
mtdnum="$(mtdname2num "$mtd")" || {
echo "Failed to find mtdnum for mtd \"$mtd\""
exit 1
}
ubi="$(mtdnum2ubi_autoattach "$mtdnum")" || {
echo "Failed to find ubi for mtd \"$mtd\""
exit 1
}
spec="$ubi:$rspec"
;;
esac
/bin/mount -i -t ubifs "$spec" "$@"
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