| # 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', True) |
| 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 gummiboot 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 |