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According to 'guestfs_sync' API method documentation: "You should always call this if you have modified a disk image, before closing the handle." So, 'guestfish --remote sync' is required because changes made on the disk (guestfish --remote rm /tail) should be visible to 'virt-tail' which works in different process and also accessing the same disk. A you can see, other changes done via 'guestfish --remote' in this test are flushed via a 'sync' command. The test is failing spontaneously beasue without 'sync' it very depends on outside factors like qemu caching policy, underlying host filesystem etc.
117 lines
3.1 KiB
Bash
Executable File
117 lines
3.1 KiB
Bash
Executable File
#!/bin/bash -
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# libguestfs
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# Copyright (C) 2016 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# To test virt-tail, we run a guestfish instance which creates a disk
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# and a file in that disk. We then run virt-tail in parallel. Back
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# in the guestfish instance we append to the file, and we check that
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# the addenda are displayed by virt-tail.
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set -e
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set -x
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$TEST_FUNCTIONS
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skip_if_skipped
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# Libvirt screws with the SELinux labels, preventing guestfish from
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# continuing to write to the original disk. Therefore only run this
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# test when using direct access.
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skip_unless_backend direct
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out=test-virt-tail.out
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disk=test-virt-tail.disk
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rm -f $out $disk
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tailpid=0
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eval `guestfish --listen`
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# Clean up if the script is killed or exits early.
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cleanup ()
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{
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status=$?
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set +e
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guestfish --remote exit
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if [ "$tailpid" -gt 0 ]; then kill "$tailpid"; fi
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# Don't delete the output files if non-zero exit.
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if [ "$status" -eq 0 ]; then rm -f $disk $out; fi
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exit $status
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}
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trap cleanup INT QUIT TERM EXIT ERR
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# Create the output disk.
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guestfish --remote sparse $disk 10M
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guestfish --remote run
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guestfish --remote part-disk /dev/sda mbr
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guestfish --remote mkfs ext2 /dev/sda1
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guestfish --remote mount /dev/sda1 /
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# Create the file to be tailed with a single full line of content.
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guestfish --remote write /tail 'line 1
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'
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guestfish --remote sync
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# Run virt-tail in the background
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$VG virt-tail -a $disk -m /dev/sda1 /tail > $out &
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tailpid=$!
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# Wait for the first line of the tailed file to appear.
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# Note we can wait up to 10 minutes here to deal with slow machines.
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for retry in `seq 0 60`; do
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if grep -sq "line 1" $out; then break; fi
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sleep 10;
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done
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if [ "$retry" -ge 60 ]; then
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echo "$0: error: initial line of output did not appear"
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exit 1
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fi
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# Write some more lines to the file.
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guestfish --remote write-append /tail 'line 2
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line 3
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'
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guestfish --remote sync
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# Wait for new content to appear.
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for retry in `seq 0 60`; do
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if grep -sq "line 3" $out; then break; fi
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sleep 10;
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done
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if [ "$retry" -ge 60 ]; then
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echo "$0: error: continued output did not appear"
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exit 1
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fi
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# Delete the file. This should cause virt-tail to exit gracefully.
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guestfish --remote rm /tail
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guestfish --remote sync
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# Wait for virt-tail to finish and check the status.
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wait "$tailpid"
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tailstatus=$?
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tailpid=0
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if [ "$tailstatus" -ne 0 ]; then
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echo "$0: error: non-zero exit status from virt-tail: $tailstatus"
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exit 1
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fi
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# cleanup() is called implicitly which cleans up everything.
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exit 0
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