snap-autoremove

#!/bin/sh
# snap-autoremove (part of ossobv/vcutil) // wdoekes/2022 // Public Domain
#
# Automatically remove old unused snap packages on Ubuntu platforms.
#
# If you keep more than 2 snap revisions lying around, because you've
# been bitten by Snapcraft's poor management [1] and do not trust that two
# versions are enough to get a bug-free version of something, then those
# many revisions may accumulate and take up useful disk space.
#
# Keeping more than 2 versions around, because the snap ecosystem is stupid:
#
#   snap set system refresh.retain=12
#
# Do not silently auto-update:
#
#   snap set system experimental.refresh-app-awareness=true
#
# [1] https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1956838/comments/7
# > Personally, I think it's a waste of space to setup timeshift just
# > because Ubuntu snapcraft cannot keep more than two versions alive... I
# > think there is something wrong in the snap ecosystem if we cannot
# > choose between more than two versions which are both broken.

for app in $(snap list | awk '{if(NR>1)print $1}'); do
    current=$(readlink /snap/$app/current); current=${current%/}
    revisions=$(
        find /snap/$app -maxdepth 1 -type d \
            -regex '.*/[0-9]+$' -regextype posix-extended |
        sed -e 's#.*/##' | sort -V)
    without_current_or_last=$(
        echo "$revisions" | grep -v "${current##*/}" | sed -e '$d')
    if test -n "$without_current_or_last"; then
        echo "[$app] @$current, pruning" $without_current_or_last...
        for version in $without_current_or_last; do
            snap remove --revision=$version $app
        done
    fi
done

# vim: set ts=8 sw=4 sts=4 et ai: