2024-09-22 09:22:28 +02:00
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#!/usr/bin/bash
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2024-11-04 09:56:54 +01:00
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# snapshot-rootfs.sh
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#
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# In your /etc/profile, export the following variables
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# LVM_VG_ROOTFS=vg0
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# LVM_LG_ROOTFS_NAME=rootfs-arch
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# LVM_ROOTFS_SNAPSHOT_SZ=10G
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source /etc/profile
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crash() {
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echo $1;
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exit 1;
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}
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[ \
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-n "$LVM_VG_ROOTFS" \
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-a -n "$LVM_LG_ROOTFS_NAME" \
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-a -n "$LVM_ROOTFS_SNAPSHOT_SZ" \
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] || crash "Missing one of the LVM variables for snapshot-rootfs.sh";
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2024-09-22 09:22:28 +02:00
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DATE=`date +%Y%m%dT%H%M`
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2024-11-04 09:56:54 +01:00
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LAST_SNAPSHOT_NAME=`lvs --select "origin = $LVM_LG_ROOTFS_NAME" \
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--noheadings -o "data_percent,lv_name" 2>&1 \
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|sort -n|grep -o '[^[:space:]]\+$'`
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echo "The last snapshot's name is : $LAST_SNAPSHOT_NAME. Remove it? (y/n)"
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read REMOVE_LAST_SNAPSHOT
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[ $REMOVE_LAST_SNAPSHOT = "y" ] && lvremove $LVM_VG_ROOTFS/$LAST_SNAPSHOT_NAME
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lvcreate -n $LVM_LG_ROOTFS_NAME-$DATE \
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--snapshot \
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-L $LVM_ROOTFS_SNAPSHOT_SZ $LVM_VG_ROOTFS/$LVM_LG_ROOTFS_NAME
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