container-management

🐄 btrfs 'container' management pacman hook which makes a snapshot of the current state after moving the prior two and copies the current running kernel image before applying pacman operations allowing one to boot the snapshot directly without concern
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container-management (1775B)

      1 #!/bin/bash
      2 # copy kernel and create snapshot of current state
      3 # assumes $fsroot will be mounted
      4 bin=$(dirname "$0")
      5 # load config
      6 source "$bin/config"
      7 
      8 # some variables
      9 subvolume_a="$prefix$a"
     10 subvolume_b="$prefix$b"
     11 subvolume_c="$prefix$c"
     12 subvolume_d="$prefix$d"
     13 
     14 # copy kernel
     15 printf -- "%s\n" "copying /boot/$b-vmlinuz-$kernel to /boot/$c-vmlinuz-$kernel"
     16 cp "/boot/$b-vmlinuz-$kernel" "/boot/$c-vmlinuz-$kernel"
     17 printf -- "%s\n" "copying /boot/$b-initramfs-$kernel.img to /boot/$c-initramfs-$kernel.img"
     18 cp "/boot/$b-initramfs-$kernel.img" "/boot/$c-initramfs-$kernel.img"
     19 printf -- "%s\n" "copying /boot/$b-initramfs-$kernel-fallback.img to /boot/$c-initramfs-$kernel-fallback.img"
     20 cp "/boot/$b-initramfs-$kernel-fallback.img" "/boot/$c-initramfs-$kernel-fallback.img"
     21 printf -- "%s\n" "copying /boot/vmlinuz-$kernel to /boot/$b-vmlinuz-$kernel"
     22 cp "/boot/vmlinuz-$kernel" "/boot/$b-vmlinuz-$kernel"
     23 printf -- "%s\n" "copying /boot/initramfs-$kernel.img to /boot/$b-initramfs-$kernel.img"
     24 cp "/boot/initramfs-$kernel.img" "/boot/$b-initramfs-$kernel.img"
     25 printf -- "%s\n" "copying /boot/initramfs-$kernel-fallback.img to /boot/$b-initramfs-$kernel-fallback.img"
     26 cp "/boot/initramfs-$kernel-fallback.img" "/boot/$b-initramfs-$kernel-fallback.img"
     27 
     28 # rotate snapshots start by deleting d
     29 btrfs subvolume delete "$fsroot/$subvolume_d"
     30 printf -- "%s\n" "moving $fsroot/$subvolume_c to $fsroot/$subvolume_d"
     31 mv "$fsroot/$subvolume_c" "$fsroot/$subvolume_d"
     32 printf -- "%s\n" "moving $fsroot/$subvolume_b to $fsroot/$subvolume_c"
     33 mv "$fsroot/$subvolume_b" "$fsroot/$subvolume_c"
     34 
     35 # snapshot current state
     36 btrfs subvolume snapshot "$fsroot/$subvolume_a" "$fsroot/$subvolume_b"
     37 
     38 # create $stamp to date the latest snapshot
     39 date "+$stamp_format" > "$fsroot/$subvolume_b/$stamp"