File: libvirt-guests.sh.in

package info (click to toggle)
libvirt 5.6.0-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 240,844 kB
  • sloc: ansic: 584,521; xml: 176,725; sh: 9,912; python: 4,731; perl: 4,343; makefile: 3,321; ml: 465
file content (623 lines) | stat: -rw-r--r-- 16,510 bytes parent folder | download | duplicates (2)
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
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
#!/bin/sh
#
### BEGIN INIT INFO
# Provides: libvirt-guests
# Required-Start: $remote_fs libvirtd
# Required-Stop: $remote_fs libvirtd
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: suspend/resume libvirt guests on shutdown/boot
# Description: This is a script for suspending active libvirt guests
#              on shutdown and resuming them on next boot
#              See https://libvirt.org/
### END INIT INFO
#
# Copyright (C) 2011-2014 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library.  If not, see
# <http://www.gnu.org/licenses/>.

sysconfdir=/etc
localstatedir=/var
libvirtd=/usr/sbin/libvirtd

# Source gettext library.
# Make sure this file is recognized as having translations: _("dummy")
. /usr/bin/gettext.sh

# Make sure calls to this script get redirected to systemctl when
# using systemd
. /lib/lsb/init-functions

export TEXTDOMAIN="libvirt" TEXTDOMAINDIR="/usr/share/locale"

URIS=default
ON_BOOT=ignore
ON_SHUTDOWN=shutdown
SHUTDOWN_TIMEOUT=300
PARALLEL_SHUTDOWN=0
START_DELAY=0
BYPASS_CACHE=0
CONNECT_RETRIES=10
RETRIES_SLEEP=1
SYNC_TIME=0

test -f "$sysconfdir"/default/libvirt-guests &&
    . "$sysconfdir"/default/libvirt-guests

LISTFILE="$localstatedir"/lib/libvirt/libvirt-guests
VAR_SUBSYS_LIBVIRT_GUESTS="$localstatedir"/lock/libvirt-guests

RETVAL=0

# retval COMMAND ARGUMENTS...
# run command with arguments and convert non-zero return value to 1 and set
# the global return variable
retval() {
    "$@"
    if [ $? -ne 0 ]; then
        RETVAL=1
        return 1
    else
        return 0
    fi
}

# run_virsh URI ARGUMENTS...
# start virsh and let it execute ARGUMENTS on URI
# If URI is "default" virsh is called without the "-c" argument
# (using libvirt's default connection)
run_virsh() {
    uri=$1
    shift

    if [ "x$uri" = xdefault ]; then
        virsh "$@" </dev/null
    else
        virsh -c "$uri" "$@" </dev/null
    fi
}

# run_virsh_c URI ARGUMENTS
# Same as "run_virsh" but the "C" locale is used instead of
# the system's locale.
run_virsh_c() {
    ( export LC_ALL=C; run_virsh "$@" )
}

# test_connect URI
# check if URI is reachable
test_connect()
{
    uri=$1

    i=${CONNECT_RETRIES}
    while [ $i -gt 0 ]; do
        run_virsh "$uri" connect 2>/dev/null
        if [ $? -eq 0 ]; then
            return 0;
        fi
        sleep ${RETRIES_SLEEP}
        eval_gettext "Unable to connect to libvirt currently. Retrying .. \$i"
        i=$(($i-1))
    done
    eval_gettext "Can't connect to \$uri. Skipping."
    echo
    return 1
}

# list_guests URI PERSISTENT
# List running guests on URI.
# PERSISTENT argument options:
# --persistent: list only persistent guests
# --transient: list only transient guests
# [none]: list both persistent and transient guests
list_guests() {
    uri=$1
    persistent=$2

    list=$(run_virsh_c "$uri" list --uuid $persistent)
    if [ $? -ne 0 ]; then
        RETVAL=1
        return 1
    fi

    echo "$list" | sed "/00000000-0000-0000-0000-000000000000/d"
}

# guest_name URI UUID
# return name of guest UUID on URI
guest_name() {
    uri=$1
    uuid=$2

    run_virsh "$uri" domname "$uuid" 2>/dev/null
}

# guest_is_on URI UUID
# check if guest UUID on URI is running
# Result is returned by variable "guest_running"
guest_is_on() {
    uri=$1
    uuid=$2

    guest_running=false
    id=$(run_virsh "$uri" domid "$uuid")
    if [ $? -ne 0 ]; then
        RETVAL=1
        return 1
    fi

    [ -n "$id" ] && [ "x$id" != x- ] && guest_running=true
    return 0
}

# started
# Create the startup lock file
started() {
    touch "$VAR_SUBSYS_LIBVIRT_GUESTS"
}

# start
# Start or resume the guests
start() {
    [ -f "$LISTFILE" ] || { started; return 0; }

    if [ "x$ON_BOOT" != xstart ]; then
        gettext "libvirt-guests is configured not to start any guests on boot"
        echo
        rm -f "$LISTFILE"
        started
        return 0
    fi

    isfirst=true
    bypass=
    sync_time=false
    test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
    test "x$SYNC_TIME" = x0 || sync_time=true
    while read uri list; do
        configured=false
        set -f
        for confuri in $URIS; do
            set +f
            if [ "x$confuri" = "x$uri" ]; then
                configured=true
                break
            fi
        done
        set +f
        if ! "$configured"; then
            eval_gettext "Ignoring guests on \$uri URI"; echo
            continue
        fi

        test_connect "$uri" || continue

        eval_gettext "Resuming guests on \$uri URI..."; echo
        for guest in $list; do
            name=$(guest_name "$uri" "$guest")
            eval_gettext "Resuming guest \$name: "
            if guest_is_on "$uri" "$guest"; then
                if "$guest_running"; then
                    gettext "already active"; echo
                else
                    if "$isfirst"; then
                        isfirst=false
                    else
                        sleep $START_DELAY
                    fi
                    retval run_virsh "$uri" start $bypass "$name" \
                        >/dev/null && \
                    gettext "done"; echo
                    if "$sync_time"; then
                        run_virsh "$uri" domtime --sync "$name" >/dev/null
                    fi
                fi
            fi
        done
    done <"$LISTFILE"

    rm -f "$LISTFILE"
    started
}

# suspend_guest URI GUEST
# Do a managed save on a GUEST on URI. This function returns after the guest
# was saved.
suspend_guest()
{
    uri=$1
    guest=$2

    name=$(guest_name "$uri" "$guest")
    label=$(eval_gettext "Suspending \$name: ")
    bypass=
    slept=0
    test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
    printf '%s...\n' "$label"
    run_virsh "$uri" managedsave $bypass "$guest" >/dev/null &
    virsh_pid=$!
    while true; do
        sleep 1
        kill -0 "$virsh_pid" >/dev/null 2>&1 || break

        slept=$(($slept + 1))
        if [ $(($slept % 5)) -eq 0 ]; then
            progress=$(run_virsh_c "$uri" domjobinfo "$guest" 2>/dev/null | \
                    awk '/^Data processed:/{print $3, $4}')
            if [ -n "$progress" ]; then
                printf '%s%s\n' "$label" "$progress"
            else
                printf '%s%s\n' "$label" "..."
            fi
        fi
    done
    retval wait "$virsh_pid" && printf '%s%s\n' "$label" "$(gettext "done")"
}

# shutdown_guest URI GUEST
# Start an ACPI shutdown of GUEST on URI. This function returns after the guest
# was successfully shutdown or the timeout defined by $SHUTDOWN_TIMEOUT expired.
shutdown_guest()
{
    uri=$1
    guest=$2

    name=$(guest_name "$uri" "$guest")
    eval_gettext "Starting shutdown on guest: \$name"
    echo
    retval run_virsh "$uri" shutdown "$guest" >/dev/null || return
    timeout=$SHUTDOWN_TIMEOUT
    check_timeout=false
    if [ $timeout -gt 0 ]; then
        check_timeout=true
        format=$(eval_gettext "Waiting for guest %s to shut down, %d seconds left\n")
    else
        slept=0
        format=$(eval_gettext "Waiting for guest %s to shut down\n")
    fi
    while ! $check_timeout || [ "$timeout" -gt 0 ]; do
        sleep 1
        guest_is_on "$uri" "$guest" || return
        "$guest_running" || break

        if $check_timeout; then
            if [ $(($timeout % 5)) -eq 0 ]; then
                printf "$format" "$name" "$timeout"
            fi
            timeout=$(($timeout - 1))
        else
            slept=$(($slept + 1))
            if [ $(($slept % 5)) -eq 0 ]; then
                printf "$format" "$name"
            fi
        fi
    done

    if guest_is_on "$uri" "$guest"; then
        if "$guest_running"; then
            eval_gettext "Shutdown of guest \$name failed to complete in time."
        else
            eval_gettext "Shutdown of guest \$name complete."
        fi
        echo
    fi
}

# shutdown_guest_async URI GUEST
# Start a ACPI shutdown of GUEST on URI. This function returns after the command
# was issued to libvirt to allow parallel shutdown.
shutdown_guest_async()
{
    uri=$1
    guest=$2

    name=$(guest_name "$uri" "$guest")
    eval_gettext "Starting shutdown on guest: \$name"
    echo
    retval run_virsh "$uri" shutdown "$guest" > /dev/null
}

# guest_count GUEST_LIST
# Returns number of guests in GUEST_LIST
guest_count()
{
    set -- $1
    echo $#
}

# check_guests_shutdown URI GUESTS
# check if shutdown is complete on guests in "GUESTS" and returns only
# guests that are still shutting down
# Result is returned in "guests_shutting_down"
check_guests_shutdown()
{
    uri=$1
    guests_to_check=$2

    guests_shutting_down=
    for guest in $guests_to_check; do
        if ! guest_is_on "$uri" "$guest" >/dev/null 2>&1; then
            eval_gettext "Failed to determine state of guest: \$guest. Not tracking it anymore."
            echo
            continue
        fi
        if "$guest_running"; then
            guests_shutting_down="$guests_shutting_down $guest"
        fi
    done
}

# print_guests_shutdown URI BEFORE AFTER
# Checks for differences in the lists BEFORE and AFTER and prints
# a shutdown complete notice for guests that have finished
print_guests_shutdown()
{
    uri=$1
    before=$2
    after=$3

    for guest in $before; do
        case " $after " in
            *" $guest "*) continue;;
        esac

        name=$(guest_name "$uri" "$guest")
        if [ -n "$name" ]; then
            eval_gettext "Shutdown of guest \$name complete."
            echo
        fi
    done
}

# shutdown_guests_parallel URI GUESTS
# Shutdown guests GUESTS on machine URI in parallel
shutdown_guests_parallel()
{
    uri=$1
    guests=$2

    on_shutdown=
    check_timeout=false
    timeout=$SHUTDOWN_TIMEOUT
    if [ $timeout -gt 0 ]; then
        check_timeout=true
        format=$(eval_gettext "Waiting for %d guests to shut down, %d seconds left\n")
    else
        slept=0
        format=$(eval_gettext "Waiting for %d guests to shut down\n")
    fi
    while [ -n "$on_shutdown" ] || [ -n "$guests" ]; do
        while [ -n "$guests" ] &&
              [ $(guest_count "$on_shutdown") -lt "$PARALLEL_SHUTDOWN" ]; do
            set -- $guests
            guest=$1
            shift
            guests=$*
            if [ -z "$(echo $on_shutdown | grep $guest)" ] &&
               [ -n "$(guest_name "$uri" "$guest")" ]; then
                shutdown_guest_async "$uri" "$guest"
                on_shutdown="$on_shutdown $guest"
            fi
        done
        sleep 1

        set -- $guests
        guestcount=$#
        set -- $on_shutdown
        shutdowncount=$#

        if $check_timeout; then
            if [ $(($timeout % 5)) -eq 0 ]; then
                printf "$format" $(($guestcount + $shutdowncount)) "$timeout"
            fi
            timeout=$(($timeout - 1))
            if [ $timeout -le 0 ]; then
                eval_gettext "Timeout expired while shutting down domains"; echo
                RETVAL=1
                return
            fi
        else
            slept=$(($slept + 1))
            if [ $(($slept % 5)) -eq 0 ]; then
                printf "$format" $(($guestcount + $shutdowncount))
            fi
        fi

        on_shutdown_prev=$on_shutdown
        check_guests_shutdown "$uri" "$on_shutdown"
        on_shutdown="$guests_shutting_down"
        print_guests_shutdown "$uri" "$on_shutdown_prev" "$on_shutdown"
    done
}

# stop
# Shutdown or save guests on the configured uris
stop() {
    # last stop was not followed by start
    [ -f "$LISTFILE" ] && return 0

    suspending=true
    if [ "x$ON_SHUTDOWN" = xshutdown ]; then
        suspending=false
        if [ $SHUTDOWN_TIMEOUT -lt 0 ]; then
            gettext "SHUTDOWN_TIMEOUT must be equal or greater than 0"
            echo
            RETVAL=6
            return
        fi
    fi

    : >"$LISTFILE"
    set -f
    for uri in $URIS; do
        set +f

        test_connect "$uri" || continue

        eval_gettext "Running guests on \$uri URI: "

        list=$(list_guests "$uri")
        if [ $? -eq 0 ]; then
            empty=true
            for uuid in $list; do
                "$empty" || printf ", "
                printf %s "$(guest_name "$uri" "$uuid")"
                empty=false
            done

            if "$empty"; then
                gettext "no running guests."
            fi
            echo
        fi

        if "$suspending"; then
            transient=$(list_guests "$uri" "--transient")
            if [ $? -eq 0 ]; then
                empty=true
                for uuid in $transient; do
                    if "$empty"; then
                        eval_gettext "Not suspending transient guests on URI: \$uri: "
                        empty=false
                    else
                        printf ", "
                    fi
                    printf %s "$(guest_name "$uri" "$uuid")"
                done
                echo
                # reload domain list to contain only persistent guests
                list=$(list_guests "$uri" "--persistent")
                if [ $? -ne 0 ]; then
                    eval_gettext "Failed to list persistent guests on \$uri"
                    echo
                    RETVAL=1
                    set +f
                    return
                fi
            else
                gettext "Failed to list transient guests"
                echo
                RETVAL=1
                set +f
                return
            fi
        fi

        if [ -n "$list" ]; then
            echo "$uri" $list >>"$LISTFILE"
        fi
    done
    set +f

    if [ -s "$LISTFILE" ]; then
        while read uri list; do
            if "$suspending"; then
                eval_gettext "Suspending guests on \$uri URI..."; echo
            else
                eval_gettext "Shutting down guests on \$uri URI..."; echo
            fi

            if [ "$PARALLEL_SHUTDOWN" -gt 1 ] &&
               ! "$suspending"; then
                shutdown_guests_parallel "$uri" "$list"
            else
                for guest in $list; do
                    if "$suspending"; then
                        suspend_guest "$uri" "$guest"
                    else
                        shutdown_guest "$uri" "$guest"
                    fi
                done
            fi
        done <"$LISTFILE"
    else
        rm -f "$LISTFILE"
    fi

    rm -f "$VAR_SUBSYS_LIBVIRT_GUESTS"
}

# gueststatus
# List status of guests
gueststatus() {
    set -f
    for uri in $URIS; do
        set +f
        echo "* $uri URI:"
        retval run_virsh "$uri" list | grep -v "Domain-0" || echo
    done
    set +f
}

# rh_status
# Display current status: whether saved state exists, and whether start
# has been executed.
rh_status() {
    if [ -f "$LISTFILE" ]; then
        gettext "stopped, with saved guests"; echo
        RETVAL=3
    else
        if [ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ]; then
            gettext "started"; echo
            RETVAL=0
        else
            gettext "stopped, with no saved guests"; echo
            RETVAL=3
        fi
    fi
}

# usage [val]
# Display usage string, then exit with VAL (defaults to 2).
usage() {
    program_name=$0
    eval_gettext "Usage: \$program_name {start|stop|status|restart|"\
"condrestart|try-restart|reload|force-reload|gueststatus|shutdown}"; echo
    exit ${1-2}
}

# See how we were called.
if test $# != 1; then
    usage
fi
case "$1" in
    --help)
        usage 0
        ;;
    start|stop|gueststatus)
        "$1"
        ;;
    restart)
        stop && start
        ;;
    condrestart|try-restart)
        [ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ] && stop && start
        ;;
    reload|force-reload)
        # Nothing to do; we reread configuration on each invocation
        ;;
    status)
        rh_status
        ;;
    shutdown)
        ON_SHUTDOWN=shutdown
        stop
        ;;
    *)
        usage
        ;;
esac
exit $RETVAL