aboutsummaryrefslogtreecommitdiffstats
path: root/etc/init.d/zfs-functions.in
blob: 17805ebec295ea890de36fd55efcef7f231285c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
# This is a script with common functions etc used by zfs-import, zfs-mount,
# zfs-share and zfs-zed.
#
# It is _NOT_ to be called independently
#
# Released under the 2-clause BSD license.
#
# The original script that acted as a template for this script came from
# the Debian GNU/Linux kFreeBSD ZFS packages (which did not include a
# licensing stansa) in the commit dated Mar 24, 2011:
#   https://github.com/zfsonlinux/pkg-zfs/commit/80a3ae582b59c0250d7912ba794dca9e669e605a

PATH=/sbin:/bin:/usr/bin:/usr/sbin

# Source function library
if [ -f /lib/lsb/init-functions ]; then
	# LSB, Debian GNU/Linux and derivates
	. /lib/lsb/init-functions
elif [ -f /etc/rc.d/init.d/functions ]; then
	# RedHat and derivates
	. /etc/rc.d/init.d/functions
elif [ -L /etc/init.d/functions.sh ]; then
	# Gentoo
	. /etc/init.d/functions.sh
fi

# Of course the functions we need are called differently
# on different distributions - it would be way too easy
# otherwise!!
if type log_failure_msg > /dev/null 2>&1 ; then
	# LSB functions - fall through
	zfs_log_begin_msg() { log_begin_msg "$1"; }
	zfs_log_end_msg() { log_end_msg "$1"; }
	zfs_log_failure_msg() { log_failure_msg "$1"; }
	zfs_log_progress_msg() { log_progress_msg "$1"; }
elif type success > /dev/null 2>&1 ; then
	# Fedora/RedHat functions
	zfs_set_ifs() {
		# For some reason, the init function library have a problem
		# with a changed IFS, so this function goes around that.
		local tIFS="$1"
		if [ -n "$tIFS" ]
		then
			TMP_IFS="$IFS"
			IFS="$tIFS"
		fi
	}

	zfs_log_begin_msg() { echo -n "$1 "; }
	zfs_log_end_msg() {
		zfs_set_ifs "$OLD_IFS"
		if [ "$1" -eq 0 ]; then
			success
		else
			failure
		fi
		echo
		zfs_set_ifs "$TMP_IFS"
	}
	zfs_log_failure_msg() {
		zfs_set_ifs "$OLD_IFS"
		failure
		echo
		zfs_set_ifs "$TMP_IFS"
	}
	zfs_log_progress_msg() { echo -n $"$1"; }
elif type einfo > /dev/null 2>&1 ; then
	# Gentoo functions
	zfs_log_begin_msg() { ebegin "$1"; }
	zfs_log_end_msg() { eend "$1"; }
	zfs_log_failure_msg() { eerror "$1"; }
#	zfs_log_progress_msg() { echo -n "$1"; }
	zfs_log_progress_msg() { echo -n; }
else
	# Unknown - simple substitues.
	zfs_log_begin_msg() { echo -n "$1"; }
	zfs_log_end_msg() {
		ret=$1
		if [ "$ret" -ge 1 ]; then
			echo " failed!"
		else
			echo " success"
		fi
		return "$ret"
	}
	zfs_log_failure_msg() { echo "$1"; }
	zfs_log_progress_msg() { echo -n "$1"; }
fi

# Paths to what we need
ZFS="@sbindir@/zfs"
ZED="@sbindir@/zed"
ZPOOL="@sbindir@/zpool"
ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"

# Sensible defaults
ZFS_MOUNT='yes'
ZFS_UNMOUNT='yes'

export ZFS ZED ZPOOL ZPOOL_CACHE ZFS_MOUNT ZFS_UNMOUNT

# Source zfs configuration, overriding the defaults
if [ -f @initconfdir@/zfs ]; then
	. @initconfdir@/zfs
fi

# ----------------------------------------------------

zfs_action()
{
	local MSG="$1";	shift
	local CMD="$*"
	local ret

	zfs_log_begin_msg "$MSG "
	$CMD
	ret=$?
	if [ "$ret" -eq 0 ]; then
		zfs_log_end_msg $ret
	else
		zfs_log_failure_msg $ret
	fi

	return $ret
}

# Returns
#   0 if daemon has been started
#   1 if daemon was already running
#   2 if daemon could not be started
#   3 if unsupported
#
zfs_daemon_start()
{
	local PIDFILE="$1";	shift
	local DAEMON_BIN="$1";	shift
	local DAEMON_ARGS="$*"

	if type start-stop-daemon > /dev/null 2>&1 ; then
		# LSB functions
		start-stop-daemon --start --quiet --pidfile "$PIDFILE" \
		    --exec "$DAEMON_BIN" --test > /dev/null || return 1

	        start-stop-daemon --start --quiet --exec "$DAEMON_BIN" -- \
		    $DAEMON_ARGS || return 2

		# On Debian GNU/Linux, there's a 'sendsigs' script that will
		# kill basically everything quite early and zed is stopped
		# much later than that. We don't want zed to be among them,
		# so add the zed pid to list of pids to ignore.
		if [ -f "$PIDFILE" -a -d /run/sendsigs.omit.d ]
		then
			ln -s "$PIDFILE" /run/sendsigs.omit.d/zed
		fi
	elif type daemon > /dev/null 2>&1 ; then
	        # Fedora/RedHat functions
		daemon --pidfile "$PIDFILE" "$DAEMON_BIN" $DAEMON_ARGS
		return $?
	else
		# Unsupported
		return 3
	fi

	return 0
}

# Returns
#   0 if daemon has been stopped
#   1 if daemon was already stopped
#   2 if daemon could not be stopped
#   3 if unsupported
#
zfs_daemon_stop()
{
	local PIDFILE="$1"
	local DAEMON_BIN="$2"
	local DAEMON_NAME="$3"

	if type start-stop-daemon > /dev/null 2>&1 ; then
		# LSB functions
		start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 \
		    --pidfile "$PIDFILE" --name "$DAEMON_NAME"
		[ "$?" = 0 ] && rm -f "$PIDFILE"

		return $?
	elif type killproc > /dev/null 2>&1 ; then
		# Fedora/RedHat functions
		killproc -p "$PIDFILE" "$DAEMON_NAME"
		[ "$?" = 0 ] && rm -f "$PIDFILE"

		return $?
	else
		# Unsupported
		return 3
	fi

	return 0
}

# Returns status
zfs_daemon_status()
{
	local PIDFILE="$1"
	local DAEMON_BIN="$2"
	local DAEMON_NAME="$3"

	if type status_of_proc > /dev/null 2>&1 ; then
		# LSB functions
		status_of_proc "$DAEMON_NAME" "$DAEMON_BIN"
		return $?
	elif type status > /dev/null 2>&1 ; then
		# Fedora/RedHat functions
		status -p "$PIDFILE" "$DAEMON_NAME"
		return $?
	else
		# Unsupported
		return 3
	fi

	return 0
}

zfs_daemon_reload()
{
	local PIDFILE="$1"
	local DAEMON_NAME="$2"

	if type start-stop-daemon > /dev/null 2>&1 ; then
		# LSB functions
		start-stop-daemon --stop -signal 1 --quiet \
		    --pidfile "$PIDFILE" --name "$DAEMON_NAME"
		return $?
	elif type killproc > /dev/null 2>&1 ; then
		# Fedora/RedHat functions
                killproc -p "$PIDFILE" "$DAEMON_NAME" -HUP
		return $?
	else
		# Unsupported
		return 3
	fi

	return 0
}

zfs_installed()
{
	if [ ! -x "$ZPOOL" ]; then
		return 1
	else
		# Test if it works (will catch missing/broken libs etc)
		"$ZPOOL" -? > /dev/null 2>&1
		return $?
	fi

	if [ ! -x "$ZFS" ]; then
		return 2
	else
		# Test if it works (will catch missing/broken libs etc)
		"$ZFS" -? > /dev/null 2>&1
		return $?
	fi

	return 0
}

# Trigger udev and wait for it to settle.
udev_trigger()
{
	if [ -x /sbin/udevadm ]; then
		/sbin/udevadm trigger --action=change --subsystem-match=block
		/sbin/udevadm settle
	elif [ -x /sbin/udevsettle ]; then
		/sbin/udevtrigger
		/sbin/udevsettle
	fi
}

# Do a lot of checks to make sure it's 'safe' to continue with the import.
checksystem()
{
	if grep -qiE '(^|[^\\](\\\\)* )zfs=(off|no|0)( |$)' /proc/cmdline;
	then
		# Called with zfs=(off|no|0) - bail because we don't
		# want anything import, mounted or shared.
		# HOWEVER, only do this if we're called at the boot up
		# (from init), not if we're running interactivly (as in
		# from the shell - we know what we're doing).
		[ -n "$init" ] && exit 3
	fi

	# Check if ZFS is installed.
	zfs_installed || return 5

	# Just make sure that /dev/zfs is created.
	udev_trigger

	if ! [ "$(uname -m)" = "x86_64" ]; then
		echo "Warning: You're not running 64bit. Currently native zfs in";
		echo "         Linux is only supported and tested on 64bit.";
		# should we break here? People doing this should know what they
		# do, thus i'm not breaking here.
	fi

	return 0
}

reregister_mounts()
{
	local fs mntpnt fstype opts rest tmpdir
	tmpdir=removethismountpointhoweverpossible

	while read -r fs mntpnt fstype opts rest ; do
		fs=$(printf '%b\n' "$fs")
		mntpnt=$(printf '%b\n' "$mntpnt")
		if [ "$fstype" = "zfs" ] ; then
			if [ "$mntpnt" = "/" ] ; then
				mount -f -o zfsutil -t zfs --move / /$tmpdir
				umount --fake /$tmpdir
			else
				umount --fake "$mntpnt"
			fi
		elif echo "$fs" | grep -qE "^/dev/(zd|zvol)" ; then
			if [ "$mntpnt" = "/" ] ; then
				mount -f -t "$fstype" --move / /$tmpdir
				umount --fake /$tmpdir
			else
				umount --fake "$mntpnt"
			fi
		fi
	done < /proc/mounts

	while read -r fs mntpnt fstype opts rest ; do
		fs=$(printf '%b\n' "$fs")
		mntpnt=$(printf '%b\n' "$mntpnt")
		if [ "$fstype" = "zfs" ] ; then
			mount -f -t zfs -o zfsutil "$fs" "$mntpnt"
		elif echo "$fs" | grep -q "^/dev/zd" ; then
			mount -f -t "$fstype" -o "$opts" "$fs" "$mntpnt"
		fi
	done < /proc/mounts
}

get_root_pool()
{
	set -- $(mount | grep ' on / ')
	[ "$5" = "zfs" ] && echo "${1%%/*}"
}

check_module_loaded()
{
	[ -r /sys/module/zfs/version ] && return 0 || return 1
}

load_module()
{
	# Load the zfs module stack
	if ! check_module_loaded; then
		if ! modprobe zfs; then
			return 5
		fi
	fi
	return 0
}

# first parameter is a regular expression that filters mtab
read_mtab()
{
	local match="$1"
	local fs mntpnt fstype opts rest TMPFILE

	# Unset all MTAB_* variables
	unset $(env | grep ^MTAB_ | sed 's,=.*,,')

	while read -r fs mntpnt fstype opts rest; do
		if echo "$fs $mntpnt $fstype $opts" | grep -qE "$match"; then
			mntpnt=$(printf '%b\n' "$mntpnt" | sed 's,/,_,g')
			eval export MTAB_$mntpnt="$fs"
		fi
	done < /proc/mounts
}

in_mtab()
{
	local fs="$(echo "$1" | sed 's,/,_,g')"
	local var

	var="$(eval echo MTAB_$fs)"
	[ "$(eval echo "$""$var")" != "" ]
	return "$?"
}

# first parameter is a regular expression that filters fstab
read_fstab()
{
	local match="$1"
	local i var TMPFILE

	# Unset all FSTAB_* variables
	unset $(env | grep ^FSTAB_ | sed 's,=.*,,')

	i=0
	while read -r fs mntpnt fstype opts; do
		echo "$fs" | egrep -qE '^#|^$' && continue

		if echo "$fs $mntpnt $fstype $opts" | grep -qE "$match"; then
			eval export FSTAB_dev_$i="$fs"
			fs=$(printf '%b\n' "$fs" | sed 's,/,_,g')
			eval export FSTAB_$i="$mntpnt"

			i=$((i + 1))
		fi
	done < /etc/fstab
}

in_fstab()
{
	local var

	var="$(eval echo FSTAB_$1)"
	[ "${var}" != "" ]
	return $?
}

is_mounted()
{
	local mntpt="$1"
	local line

	mount | \
	    while read line; do
		if echo "$line" | grep -q " on $mntpt "; then
		    return 0
		fi
	    done

	return 1
}