6d7bcd4df5
As mentioned when introducing the VM images (https://bugzilla.yoctoproject.org/show_bug.cgi?id=7374), the resulting images only work when the image is mounted as a disk that results in the hard-coded path (/dev/sda in the current default). Using the file system UUID to find the rootfs is more flexible. To enable this for boot-direct.bbclass and thus image-vm.bbclass (aka FSTYPEs vdi/vmdk/qcow2), set SYSLINUX_ROOT = "root=UUID=<<uuid-of-rootfs>>". The rootfs image must use an ext file system. The special string will get replaced in the APPEND line with the actual UUID when the boot loader (grub-efi, syslinux or gummiboot) writes the boot loader configuration files. At that time, the rootfs image has already been created and its UUID can be extracted using "tune2fs -l", which also should be available because the e2fsprogs-native tools were needed to create the image in the first place. (From OE-Core rev: 1e29d77d0d33ee216b43022439876863f0db39bb) Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
25 lines
1,014 B
Text
25 lines
1,014 B
Text
# Extract UUID from ${ROOTFS}, which must have been built
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# by the time that this function gets called. Only works
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# on ext file systems and depends on tune2fs.
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def get_rootfs_uuid(d):
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import subprocess
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rootfs = d.getVar('ROOTFS', True)
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output = subprocess.check_output(['tune2fs', '-l', rootfs])
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for line in output.split('\n'):
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if line.startswith('Filesystem UUID:'):
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uuid = line.split()[-1]
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bb.note('UUID of %s: %s' % (rootfs, uuid))
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return uuid
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bb.fatal('Could not determine filesystem UUID of %s' % rootfs)
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# Replace the special <<uuid-of-rootfs>> inside a string (like the
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# root= APPEND string in a syslinux.cfg or gummiboot entry) with the
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# actual UUID of the rootfs. Does nothing if the special string
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# is not used.
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def replace_rootfs_uuid(d, string):
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UUID_PLACEHOLDER = '<<uuid-of-rootfs>>'
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if UUID_PLACEHOLDER in string:
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uuid = get_rootfs_uuid(d)
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string = string.replace(UUID_PLACEHOLDER, uuid)
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return string
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