This is much faster than using Rsync to clone.

Rsync stays available when the chroots are not on a Btrfs.

This prevents accidents when chroots are shared between multiple users.

Archbuild should be called via sudo.

No functional change.

This avoids updating the chroot on every call. See https://bugs.archlinux.org/task/21930

Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

This bypasses a strange pacman behaviour with the --noconfirm parameter.

This will create chroots on demand if needed.