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fix(disk_util): Add option to safely rewrite partition table.

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write_gpt --update <img> will read an existing image and make sure all
existing partitions will not get moved or truncated in the new layout.
This is mostly useful for resizing the final partition or just rewriting
metadata like partition types and labels.
This commit is contained in:
Michael Marineau 2014-01-03 16:40:54 -08:00
parent 5afd720956
commit 805cc65ffd
1 changed files with 18 additions and 2 deletions
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20
build_library/disk_util
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@ -222,6 +222,18 @@ def WritePartitionTable(options, config=None, partitions=None):
if not (config and partitions): if not (config and partitions):
config, partitions = LoadPartitionConfig(options) config, partitions = LoadPartitionConfig(options)
# If we are not creating a fresh image all existing partitions must:
# - be defined in the new layout
# - start at the same position
# - be the same size or larger in the new layout
if not options.create:
old_parts = GetPartitionTableFromImage(options)
for part_num, old_part in old_parts.iteritems():
part = partitions.get(part_num, {})
if (old_part['first_block'] != part.get('first_block', -1) or
old_part['blocks'] > part.get('blocks', -1)):
raise InvalidLayout("New disk layout is incompatible existing image")
Cgpt('create', '-c', '-s', config['metadata']['blocks'], options.disk_image) Cgpt('create', '-c', '-s', config['metadata']['blocks'], options.disk_image)
esp_number = None esp_number = None
@ -618,7 +630,11 @@ def main(argv):
help='disk layout type from the json file') help='disk layout type from the json file')
actions = parser.add_subparsers(title='actions') actions = parser.add_subparsers(title='actions')
a = actions.add_parser('write_gpt', help='write gpt to new image') a = actions.add_parser('write_gpt', help='write/update partition table')
a.add_argument('--create', action='store_true', default=True,
help='initialize new partition table')
a.add_argument('--update', action='store_false', dest='create',
help='update existing partition table')
a.add_argument('--mbr_boot_code', a.add_argument('--mbr_boot_code',
help='path to mbr boot block, such as syslinux/gptmbr.bin') help='path to mbr boot block, such as syslinux/gptmbr.bin')
a.add_argument('disk_image', help='path to disk image file') a.add_argument('disk_image', help='path to disk image file')
@ -628,7 +644,7 @@ def main(argv):
a.add_argument('--mbr_boot_code', a.add_argument('--mbr_boot_code',
help='path to mbr boot block, such as syslinux/gptmbr.bin') help='path to mbr boot block, such as syslinux/gptmbr.bin')
a.add_argument('disk_image', help='path to disk image file') a.add_argument('disk_image', help='path to disk image file')
a.set_defaults(func=Format) a.set_defaults(func=Format, create=True)
a = actions.add_parser('mount', help='mount filesystems in image') a = actions.add_parser('mount', help='mount filesystems in image')
a.add_argument('--read_only', '-r', help='mount filesystems read-only') a.add_argument('--read_only', '-r', help='mount filesystems read-only')