infrastructure/roles/archbuild/files/clean-chroots

#!/bin/zsh
setopt extendedglob nomatch errreturn

integer ret=0

cd /var/lib/archbuild

chroots=( */^root(/Nmh+2) )
(( ${#chroots} )) || exit 0

df -HT .
echo "<6>Deleting ${#chroots} chroots"

if btrfs filesystem df . &>/dev/null; then
  remove() {
    local subvol

    test -d $1
    find $1 -mindepth 1 -xdev -depth -inum 256 -print0 |
      while IFS= read -d $'\0' -r subvol; do
        remove $subvol
      done

    btrfs sub del -- $1 &>/dev/null
  }
else
  remove() {
    rm -rf -- $1
  }
fi

for chroot in $chroots; do
  exec 9>>| $chroot.lock

  if ! flock -n 9; then
    echo "<5>Not deleting $chroot; in use"
    continue
  fi

  if remove $chroot; then
    echo "<6>Deleted $chroot"
  else
    echo "<3>Error deleting $chroot"
    ret=1
  fi

  # We don't remove the lockfile. Less races that way
done

df -HT .
exit $ret

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