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# /lib/rcscripts/addons/dm-start.sh: Setup DM volumes at boot
# $Header: /var/cvsroot/gentoo-x86/sys-fs/lvm2/files/dm-start.sh,v 1.1 2009/04/09 23:00:10 caleb Exp $
# char **get_new_dm_volumes(void)
#
# Return dmsetup commands to setup volumes
get_new_dm_volumes() {
local volume params
# Filter comments and blank lines
grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | \
while read volume params ; do
# If it exists, skip it
dmvolume_exists "${volume%:}" && continue
# Assemble the command to run to create volume
echo "echo ${params} | /sbin/dmsetup create ${volume%:}"
done
return 0
}
# int dmvolume_exists(volume)
#
# Return true if volume exists in DM table
dmvolume_exists() {
local x line volume=$1
[ -z "${volume}" ] && return 1
/sbin/dmsetup ls 2>/dev/null | \
while read line ; do
for x in ${line} ; do
# the following conditonal return only breaks out
# of the while loop, as it is running in a pipe.
[ "${x}" = "${volume}" ] && return 1
# We only want to check the volume name
break
done
done
# if 1 was returned from the above loop, then indicate that
# volume exists
[ $? = 1 ] && return 0
# otherwise the loop exited normally and the volume does not
# exist
return 1
}
# int is_empty_dm_volume(volume)
#
# Return true if the volume exists in DM table, but is empty/non-valid
is_empty_dm_volume() {
local table volume=$1
set -- $(/sbin/dmsetup table 2>/dev/null | grep -e "^${volume}:")
[ "${volume}" = "$1" -a -z "$2" ]
}
local x volume
if [ -x /sbin/dmsetup -a -c /dev/mapper/control -a -f /etc/dmtab ] ; then
[ -n "$(get_new_dm_volumes)" ] && \
einfo " Setting up device-mapper volumes:"
get_new_dm_volumes | \
while read x ; do
[ -n "${x}" ] || continue
volume="${x##* }"
ebegin " Creating volume: ${volume}"
if ! eval "${x}" >/dev/null 2>/dev/null ; then
eend 1 " Error creating volume: ${volume}"
# dmsetup still adds an empty volume in some cases,
# so lets remove it
is_empty_dm_volume "${volume}" && \
/sbin/dmsetup remove "${volume}" 2>/dev/null
else
eend 0
fi
done
fi
# vim:ts=4
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