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-rw-r--r--meta/classes/fs-uuid.bbclass24
1 files changed, 24 insertions, 0 deletions
diff --git a/meta/classes/fs-uuid.bbclass b/meta/classes/fs-uuid.bbclass
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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', 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