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# Extract UUID from ${ROOTFS}, which must have been built
# by the time that this function gets called. Only works
# on ext file systems and depends on tune2fs.
def get_rootfs_uuid(d):
import subprocess
rootfs = d.getVar('ROOTFS')
output = subprocess.check_output(['tune2fs', '-l', rootfs])
for line in output.split('\n'):
if line.startswith('Filesystem UUID:'):
uuid = line.split()[-1]
bb.note('UUID of %s: %s' % (rootfs, uuid))
return uuid
bb.fatal('Could not determine filesystem UUID of %s' % rootfs)
# Replace the special <<uuid-of-rootfs>> inside a string (like the
# root= APPEND string in a syslinux.cfg or systemd-boot entry) with the
# actual UUID of the rootfs. Does nothing if the special string
# is not used.
def replace_rootfs_uuid(d, string):
UUID_PLACEHOLDER = '<<uuid-of-rootfs>>'
if UUID_PLACEHOLDER in string:
uuid = get_rootfs_uuid(d)
string = string.replace(UUID_PLACEHOLDER, uuid)
return string
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