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#/bin/sh
[ "$(id -u)" = 0 ] || exec sudo "$0" "$@" || exit
is_subvol()
{
btrfs subvolume show "$1" >/dev/null 2>&1
}
btrfs_subvolumes()
{
btrfs subvolume list -a -t "${1:-/}" | awk '{print $4}' | sed -Ene 's?^(<FS_TREE>/)\?root/?/?p'
}
snapit()
{
local dev mnt target
mnt=$(mktemp -d /tmp/mnt.XXXXXX) || return
src=$mnt/$1/
target=$mnt/${2:-daily/}${1%/}~$(date -I)
dev=$(btrfs fi sh / | sed -ne 's/.* path //p' | tail -n1) || return
mount "$dev" -o subvol=/ "$mnt"
if [ -e "$target" ]
then
:
else
mkdir -p "$(dirname "$target")"
btrfs subvolume snapshot -r "$src" "$target"
fi
umount "$mnt"
rmdir "$mnt"
}
do_not_snap()
{
case "${1#/root/}" in
/var/cache/apt/archives|/home/*/.cache|/home/*/src/fsmgr/_build|/home/*/.stack|/home/*/.rustup)
true
;;
*)
false
;;
esac
}
snapit /root
btrfs_subvolumes | while read f
do
if is_subvol "$f"
then
do_not_snap "$f" || snapit /root/"${f#/}"
fi
done
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