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e59027e4f7
Create backup copies of system.devices in /etc/lvm/devices/backup named system.devices-YYYYMMDD.HHMMSS.NNNN. NNNN is the version counter from the file. Each time that an lvm command writes a new system.devices file, it also writes the same file in the backup directory. A new comment line is added to system.devices with HASH=<num> where <num> is a crc calculated from the uncommented lines in system.devices. This lets lvm detect if the file has been modified outside of lvm itself. If system.devices is edited directly, the next time a command reads the file, the crc will not match the HASH value. The command will then rewrite system.devices with the correct HASH value, and create a backup reflecting the edits. A default limit of 50 backup files is kept, configurable by lvm.conf devicesfile_backup_limit (set to 0 to disable backups.)
110 lines
2.5 KiB
Bash
110 lines
2.5 KiB
Bash
#!/usr/bin/env bash
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# Copyright (C) 2020 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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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 Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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test_description='devices file backups'
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SKIP_WITH_LVMPOLLD=1
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. lib/inittest
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aux prepare_devs 3
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aux lvmconf 'devices/use_devicesfile = 1'
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# Stupid tests use plain /etc/ rather than /etc/lvm/
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DFDIR="$LVM_SYSTEM_DIR/devices"
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BKDIR="$LVM_SYSTEM_DIR/devices/backup"
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mkdir -p "$DFDIR" || true
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mkdir -p "$BKDIR" || true
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DF="$DFDIR/system.devices"
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vgcreate $vg "$dev1"
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diff $DF $BKDIR/*.0001
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pvcreate "$dev2"
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diff $DF $BKDIR/*.0002
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lvmdevices --deldev "$dev2"
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diff $DF $BKDIR/*.0003
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lvmdevices --adddev "$dev2"
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diff $DF $BKDIR/*.0004
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# DF update and backup when an entry is manually removed
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cat $DF | grep -v "$dev2" > tmp1
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cp tmp1 $DF
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pvs
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diff $DF $BKDIR/*.0005
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lvmdevices --adddev "$dev2"
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diff $DF $BKDIR/*.0006
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# DF update and abckup when HASH value changes
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sed -e "s|HASH=.......|HASH=1111111|" $DF > tmp1
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cp tmp1 $DF
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pvs
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not grep "HASH=1111111" $DF
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diff $DF $BKDIR/*.0007
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# DF update and backup when old DF has no HASH value
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cat $DF | grep -v HASH > tmp1
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cp tmp1 $DF
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pvs
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grep HASH $DF
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diff $DF $BKDIR/*.0008
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# DF update and backup when dev names change
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pvcreate "$dev3"
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diff $DF $BKDIR/*.0009
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grep "$dev2" $DF
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grep "$dev3" $DF
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dd if="$dev2" of=dev2_header bs=1M count=1
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dd if="$dev3" of=dev3_header bs=1M count=1
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dd if=dev2_header of="$dev3"
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dd if=dev3_header of="$dev2"
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pvs
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diff $DF $BKDIR/*.0010
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# backup limit, remove 1
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aux lvmconf 'devices/devicesfile_backup_limit = 10'
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lvmdevices --deldev "$dev2"
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diff $DF $BKDIR/*.0011
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not ls $BKDIR/*.0001
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# backup limit, remove N
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aux lvmconf 'devices/devicesfile_backup_limit = 5'
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lvmdevices --adddev "$dev2"
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diff $DF $BKDIR/*.0012
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not ls $BKDIR/*.0002
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not ls $BKDIR/*.0003
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not ls $BKDIR/*.0004
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not ls $BKDIR/*.0005
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not ls $BKDIR/*.0006
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not ls $BKDIR/*.0007
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ls $BKDIR/*.0008
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ls $BKDIR/*.0009
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ls $BKDIR/*.0010
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ls $BKDIR/*.0011
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# backup disabled
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aux lvmconf 'devices/devicesfile_backup_limit = 0'
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lvmdevices --deldev "$dev2"
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not ls $BKDIR/*.0013
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# backup re-enabled
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aux lvmconf 'devices/devicesfile_backup_limit = 5'
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lvmdevices --adddev "$dev2"
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ls $BKDIR/*.0014
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not ls $BKDIR/*.0013
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vgremove -ff $vg
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