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#!/sbin/runscript
# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-fs/lvm2/files/device-mapper.rc-2.02.105-r2,v 1.1 2014/02/02 19:52:34 robbat2 Exp $
depend() {
# As of .67-r1, we call ALL lvm start/stop scripts with --sysinit, that
# means dmeventd is NOT notified, as it cannot be safely running
before dmeventd checkfs fsck
after modules
}
dm_in_proc() {
local retval=0
for x in devices misc ; do
grep -qs 'device-mapper' /proc/${x}
retval=$((${retval} + $?))
done
return ${retval}
}
# char **build_dmsetup_command(volume)
#
# Returns complete dmsetup command given single volume name
build_dmsetup_command() {
local count dmsetup_cmd
# Number of lines mentioning volume name
count=$(grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | grep -c ${1})
# If there's just one line:
if [ ${count} -eq 1 ] ; then
echo "echo $(grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | \
grep ${1} | awk '{$1=""; print $0}') | /sbin/dmsetup create ${1}"
# For all cases with more lines:
elif [ ${count} -gt 1 ] ; then
for c in $( seq 1 ${count} ) ; do
if [ ${c} -eq 1 ] ; then
# Heavy escaping in awk-statement because we cannot use apostrophes
dmsetup_cmd="echo -e $(grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | \
grep ${1} | awk NR==${c}\ \{\$1=\"\"\;\ print\ \$0\})"
else
# Append starting with newline
dmsetup_cmd="${dmsetup_cmd}\\\\n \
$(grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | \
grep ${1} | awk NR==${c}\ \{\$1=\"\"\;\ print\ \$0\})"
fi
done
echo "${dmsetup_cmd} | /sbin/dmsetup create ${1}"
fi
return 0
}
# char **get_new_dm_volumes(void)
#
# Return unique volumes from /etc/dmtab
get_new_dm_volumes() {
local volume
# Filter comments and blank lines
grep -v -e '^[[:space:]]*\(#\|$\)' /etc/dmtab | \
awk '{ print $1 }' | \
uniq | \
while read volume ; do
# If it exists, skip it
dmvolume_exists "${volume%:}" && continue
echo "${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 "$2" ]
}
start() {
if [ -e /proc/modules ] && ! dm_in_proc ; then
modprobe dm-mod 2>/dev/null
fi
# Ensure the dirs exist for locking and running
checkpath -q -d -m 0700 -o root:root /run/lvm /run/lock/lvm
local x volume
if [ -x /sbin/dmsetup -a -c /dev/mapper/control -a -f /etc/dmtab ] ; then
[ -n "$(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 $(build_dmsetup_command ${volume}) >/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
}
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