diff options
Diffstat (limited to 'morphlib/writeexts.py')
-rw-r--r-- | morphlib/writeexts.py | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/morphlib/writeexts.py b/morphlib/writeexts.py index 6ab2dd55..ad4fabe9 100644 --- a/morphlib/writeexts.py +++ b/morphlib/writeexts.py @@ -237,8 +237,32 @@ class WriteExtension(cliapp.Application): def mkfs_btrfs(self, location): '''Create a btrfs filesystem on the disk.''' + self.status(msg='Creating btrfs filesystem') - cliapp.runcmd(['mkfs.btrfs', '-f', '-L', 'baserock', location]) + try: + # The following command disables some new filesystem features. We + # need to do this because at the time of writing, SYSLINUX has not + # been updated to understand these new features and will fail to + # boot if the kernel is on a filesystem where they are enabled. + cliapp.runcmd( + ['mkfs.btrfs','-f', '-L', 'baserock', + '--features', '^extref', + '--features', '^skinny-metadata', + '--features', '^mixed-bg', + '--nodesize', '4096', + location]) + except cliapp.AppException as e: + if 'unrecognized option \'--features\'' in e.msg: + # Old versions of mkfs.btrfs (including v0.20, present in many + # Baserock releases) don't support the --features option, but + # also don't enable the new features by default. So we can + # still create a bootable system in this situation. + logging.debug( + 'Assuming mkfs.btrfs failure was because the tool is too ' + 'old to have --features flag.') + cliapp.runcmd(['mkfs.btrfs','-f', '-L', 'baserock', location]) + else: + raise def get_uuid(self, location): '''Get the UUID of a block device's file system.''' |