diff options
Diffstat (limited to 'meta/classes/fs-uuid.bbclass')
-rw-r--r-- | meta/classes/fs-uuid.bbclass | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/meta/classes/fs-uuid.bbclass b/meta/classes/fs-uuid.bbclass new file mode 100644 index 0000000000..bd2613cf10 --- /dev/null +++ b/meta/classes/fs-uuid.bbclass | |||
@@ -0,0 +1,24 @@ | |||
1 | # Extract UUID from ${ROOTFS}, which must have been built | ||
2 | # by the time that this function gets called. Only works | ||
3 | # on ext file systems and depends on tune2fs. | ||
4 | def get_rootfs_uuid(d): | ||
5 | import subprocess | ||
6 | rootfs = d.getVar('ROOTFS', True) | ||
7 | output = subprocess.check_output(['tune2fs', '-l', rootfs]) | ||
8 | for line in output.split('\n'): | ||
9 | if line.startswith('Filesystem UUID:'): | ||
10 | uuid = line.split()[-1] | ||
11 | bb.note('UUID of %s: %s' % (rootfs, uuid)) | ||
12 | return uuid | ||
13 | bb.fatal('Could not determine filesystem UUID of %s' % rootfs) | ||
14 | |||
15 | # Replace the special <<uuid-of-rootfs>> inside a string (like the | ||
16 | # root= APPEND string in a syslinux.cfg or gummiboot entry) with the | ||
17 | # actual UUID of the rootfs. Does nothing if the special string | ||
18 | # is not used. | ||
19 | def replace_rootfs_uuid(d, string): | ||
20 | UUID_PLACEHOLDER = '<<uuid-of-rootfs>>' | ||
21 | if UUID_PLACEHOLDER in string: | ||
22 | uuid = get_rootfs_uuid(d) | ||
23 | string = string.replace(UUID_PLACEHOLDER, uuid) | ||
24 | return string | ||