Script and hook to clean pacman and yay cache

yaycache

#!/usr/bin/env bash

# Assuming yay is run by user with UID 1000
admin="$(id -nu 1000)"
cachedir="/home/$admin/.cache/yay"
removed="$(comm -23 <(basename -a $(find $cachedir -mindepth 1 -maxdepth 1 -type d) | sort) <(pacman -Qqm) | xargs -r printf "$cachedir/%s\n")"

# Remove yay cache for foreign packages that are not installed anymore
rm -rf $removed

pkgcache="$(find $cachedir -mindepth 1 -maxdepth 1 -type d | xargs -r printf "-c %s\n")"

for pkgdir in "$cachedir"/*/; do

    pkgname=$(basename "$pkgdir")

    # Remove untracked files (e. g. source/build files) excepting package files and main source files for installed version if non-git package
    if [[ ! "$pkgname" =~ ^.*-git$ ]]; then

        pkgver="$(pacman -Q $pkgname | cut -d ' ' -f2 | cut -d '-' -f1 | cut -d ':' -f2)"

        cd "$pkgdir"
        rm -f $(git ls-files --others | grep -v -e '^.*\.pkg\.tar.*$' -e '^.*/$' -e "^.*$pkgver.*$" | xargs -r printf "$pkgdir/%s\n")

    fi

    rm -rf "$pkgdir"/src/

done

# Remove everything for uninstalled foreign packages, keep latest version for uninstalled native packages, keep two latest versions for installed packages
/usr/bin/paccache -qruk0 $pkgcache
/usr/bin/paccache -qruk1
/usr/bin/paccache -qrk2 -c /var/cache/pacman/pkg $pkgcache

yaycache.hook

[Trigger]
Operation = Upgrade
Operation = Remove
Type = Package
Target = *

[Action]
Description = Cleaning pacman and yay cache...
When = PostTransaction
Exec = /home/herbort/.local/bin/yaycache
Depends = pacman-contrib

Hi, @xfzv. Sorry for taking so long to reply. Thanks for taking a look at my script and for your feedback, I really appreciate that.

Just like you said, that line breaks directories of git packages. I also noticed, but honestly at that time I was too lazy to check what was wrong and I just stopped using it.

I've just updated the script, so that command only runs for non-git packages, and I changed other parts of the code, too. Take a look, I tested it and it should work fine.

I've just tried again with your last changes and it works just fine. Thank you very much!

Little fix in line 23.

As a result of this, after updating to Git 2.35.2, line 23 fails with the following error for each AUR package directory (when the script is run as root with the pacman hook):

fatal: unsafe repository ('/home/xfzv/.cache/paru/clone/aur-pkg-name' is owned by someone else)
To add an exception for this directory, call:

        git config --global --add safe.directory /home/xfzv/.cache/paru/clone/aur-pkg-name

Adding an exception as suggested (for root git config) works as expected but I'd like to avoid doing this if possible, not to mention it should be done for each AUR package. It would be a pain to maintain in the long run. Edit: Git 2.35.3 now includes safe.directory="*" to completely disable this security check.

I guess there are other solutions such as chowning ~/.cache/paru/clone/ to root:root but it's obviously a terrible idea. Another one I come up with is to run the git ls-files command as regular user with:

su $(id -nu 1000) -c "rm -f $(git ls-files --others [...])"

but for some reasons I keep getting the same error with the full rm -f $(git ls-files ..) command.

I also tried modifying the pacman hook so that the script is run as regular user:

[Action]
Exec = /bin/su xfzv -c "/home/xfzv/.local/scripts/paccache.sh"

But I'm getting an error:

==> Privilege escalation required
==> ERROR: Unable to escalate privileges using sudo
error: command failed to execute correctly

Hopefully you can come with a workaround!

Thanks in advance for your time. 🙇