Cherry-picked from
9c491c6cb auc: update to version 0.1.9
4d789eac3 auc: handle root filesystem type
545c93d45 auc: improve branch selection logic
6c784dff2 auc: move function to right place
b1d38e7ab auc: update to version 0.2.0
Signed-off-by: Daniel Golle <daniel@makrotopia.org>