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genlpmake.py
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genlpmake.py
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#!/usr/bin/python3
"""Generate lpmake commands."""
import sys
from pathlib import Path
SPARSE_IMAGE_HEADER = (0x3A, 0xFF, 0x26, 0xED)
AB_SUPER_PARTITIONS = {
'system_a',
'system_b',
'product_a',
'product_b',
'odm_a',
'odm_b',
'vendor_a',
'vendor_b',
'system_ext_a',
'system_ext_b',
}
def ask_sparse_image(raw_image_path: Path) -> (Path, Path):
"""Ask for a sparse image.
Args:
raw_image_path: Raw image Path
Returns:
(Path, Path): The raw image's Path and the sparse image's Path
"""
print(
f'[!] {raw_image_path.name} is an raw image.',
'To proceed, create an Android sparse image:',
f'img2simg {raw_image_path} {raw_image_path}.sparse.img\n',
)
while True:
sparse_image_path = Path(input('> '))
if sparse_image_path.is_file():
file_header = tuple(sparse_image_path.read_bytes()[:4])
if file_header == SPARSE_IMAGE_HEADER:
break
print(
f'[!] {sparse_image_path.name} is',
'NOT an Android sparse image.',
)
else:
print('[!] Wrong file location.')
if raw_image_path == sparse_image_path:
print(
'[!] It seems, you overwritten the raw image.',
"Please, DON'T do it again.",
)
return ask_raw_image(sparse_image_path)
return raw_image_path, sparse_image_path
def ask_raw_image(sparse_image_path: Path) -> (Path, Path):
"""Ask for a raw image.
Args:
sparse_image_path: Android sparse image Path
Returns:
(Path, Path): The raw image's Path and the sparse image's Path
"""
print(
f'[!] {sparse_image_path.name} is an Android sparse image.',
'To proceed, extract a raw image:',
f'simg2img {sparse_image_path} {sparse_image_path}.raw.img\n',
)
while True:
raw_image_path = Path(input('> '))
if raw_image_path.is_file():
if tuple(raw_image_path.read_bytes()[:4]) == SPARSE_IMAGE_HEADER:
print(f'[!] {raw_image_path.name} is an Android sparse image.')
else:
break
else:
print('[!] Wrong file location.')
if raw_image_path == sparse_image_path:
print(
'[!] It seems, you overwritten the sparse image.',
"Please, DON'T do it again.",
)
return ask_sparse_image(raw_image_path)
return raw_image_path, sparse_image_path
def get_partition_images(image_path: Path) -> (Path, Path):
"""For lpmake we need to work with both sparse and raw image at once.
Args:
image_path: Image Path (can be a sparse or raw one)
Returns:
(Path, Path): The raw image's Path and the sparse image's Path
"""
file_header = tuple(image_path.read_bytes()[:4])
if file_header == SPARSE_IMAGE_HEADER:
return ask_raw_image(image_path)
return ask_sparse_image(image_path)
# pylint: disable=too-many-branches,too-many-statements,too-many-locals
def main():
"""Generate lpmake command."""
print("""
******************************
* Generate lpmake command *
* GH: arichr/android-things *
******************************
""")
print('Specify the directory with images.')
image_dir = Path(input('> '))
if not image_dir.is_dir():
print('Wrong directory.')
sys.exit(1)
print('[...] Trying to find images...')
images = list(image_dir.glob('*.[iI][mM][gG]'))
if not images:
print('No images were found.')
sys.exit(1)
print('Which mode do you prefer?')
mode = input('[ro/rw/ASK]: ')
if mode in {'readonly', 'Readonly', 'READONLY', 'RO', 'ro'}:
mode = 'readonly'
elif mode in {'write', 'Write', 'WRITE', 'RW', 'rw'}:
mode = 'none'
else:
mode = 'ask'
partitions = []
raw_images_paths = []
images_size = 0
block_size = 4096
is_ab = False
for image_path in images:
if image_path.stem in AB_SUPER_PARTITIONS:
is_ab = True
print(f'*** {image_path.name} ***')
if mode == 'ask':
print('Which mode do you prefer?')
mode = input('[ro/RW]: ')
if mode in {'readonly', 'Readonly', 'READONLY', 'RO', 'ro'}:
print('[!] Note: This will be a read-only partition.')
image_mode = 'readonly'
else:
print('[!] Note: This will be a RW partition.')
image_mode = 'none'
# Note: Unlike raw_images_paths, 'images' can contain
# either sparse or raw images.
raw_image_path, image_path = get_partition_images(image_path)
raw_images_paths.append(raw_image_path)
if image_path.stem.isalpha():
partition_name = image_path.stem
else:
print(
"[!] Note: Falling back to raw image's name",
'for identifying a partition.',
)
partition_name = raw_image_path.stem
images_size += raw_image_path.stat().st_size
partitions.append(
'--partition {name}:{ro}:{size}:main --image {name}={path}'.format(
name=partition_name,
ro=image_mode if mode == 'ask' else mode,
size=raw_image_path.stat().st_size,
path=str(image_path),
),
)
print(partitions[-1])
print('Specify the super partition size in bytes.')
while True:
super_size = input('> ')
if super_size.isdigit() and int(super_size) % block_size == 0:
super_size = int(super_size)
break
print('[!] Wrong super size.')
print('Should lpmake generate an Android sparse image?')
is_sparse = input('[y/N]: ')
if is_sparse in {'Y', 'y'}:
print('[!] Note: lpmake will output an Android sparse image.')
is_sparse = '--sparse'
else:
print('[!] Note: lpmake will NOT output an Android sparse image.')
is_sparse = ''
if images_size > super_size:
print('[!] Your images are too big to fit in the super partition.')
sys.exit(1)
elif super_size - images_size < 104857600: # 104857600 bytes = 100 mb
print(
'[!] Note: Free super space is less than 100mb.',
'This may cause device-specific issues while booting Android.',
)
if images_size % block_size != 0:
print('[!] Output super filesize is not correct. Checking images...')
for image_path in raw_images_paths:
incomplete_block = image_path.stat().st_size % block_size
if incomplete_block == 0:
print(f'[!] Note: {image_path.name} is OK.')
else:
print(
f'[!] {image_path.name} has a problem',
f'(Expected {block_size - incomplete_block} more bytes).',
)
sys.exit(1)
print('[!] Note: metadata-size set to 65536.')
print('[!] Note: super-name set to super.')
lpmake_cmd = (
'./lpmake --metadata-size 65536 --super-name super '
f'--metadata-slots {2 if is_ab else 1} --device super:{super_size} '
f'--group main:{images_size} {" ".join(partitions)} {is_sparse} '
f'--output ./super.{hash(tuple(partitions))}.img'
)
print('\nResult:\n')
print(lpmake_cmd)
if __name__ == '__main__':
main()