31 lines
851 B
Bash
Executable file
31 lines
851 B
Bash
Executable file
#!/usr/bin/env bash
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hooktype="$1"
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backuppath="$2"
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fstype="$(df --output=fstype / | sed 1d)"
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function dellvm {
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umount ${backuppath}
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lvremove -y "$1"
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}
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function delbtrfs {
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btrfs subvolume delete ${backuppath}
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}
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if [[ "$fstype" == "btrfs" ]]; then
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if [[ -d ${backuppath} ]]; then
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delbtrfs
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fi
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if [[ "$hooktype" == "pre" ]]; then
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btrfs subvolume snapshot / ${backuppath}
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fi
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else
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snapname=nixos_snap
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volume_group="$(mount | grep 'on / ' | cut -f 1 -d' ')"
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vgname="$(lvs --noheadings "$volume_group" -o vg_name | tr -d ' ')"
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snappath="/dev/mapper/${vgname}-${snapname}"
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if [[ -b "$snappath" ]]; then
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dellvm "$snappath"
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fi
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if [[ "$hooktype" == "pre" ]]; then
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lvcreate -l50%FREE -s -n "$snapname" "$volume_group"
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mount "$snappath" -o ro /backup/snapshot
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fi
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fi
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