The modified get_ref_from_filename() supports the following snapshot formats: * $REV.$EXT * $REPO[-_]*v?$REV.$EXT This implies that the following urls will retrieve the expected revision: * http://hjemli.net/git/cgit/snapshot/v0.8.1.tar.gz * http://hjemli.net/git/cgit/snapshot/0.8.1.tar.gz * http://hjemli.net/git/cgit/snapshot/cgit-0.8.1.tar.gz * http://hjemli.net/git/cgit/snapshot/cgit-140012d7a8.tar.gz Signed-off-by: Lars Hjemli <hjemli@gmail.com>