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image.shrink_fs(): fix image size calculation

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InsanePrawn 2022-03-02 15:59:51 +01:00
parent 6fdf426f6e
commit 179434729b
1 changed files with 5 additions and 4 deletions
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9
image.py
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@ -43,7 +43,7 @@ def shrink_fs(loop_device: str, file: str, sector_size: int):
# 8: 512 bytes sectors
# 1: 4096 bytes sectors
sectors_blocks_factor = 4096 // sector_size
partprobe(loop_device)
logging.debug(f"Checking filesystem at {loop_device}p2")
result = subprocess.run(['e2fsck', '-fy', f'{loop_device}p2'])
if result.returncode > 2:
@ -105,10 +105,11 @@ def shrink_fs(loop_device: str, file: str, sector_size: int):
if end_sector == 0:
raise Exception(f'Failed to find end sector of {loop_device}p2')
end_block = end_sector // sectors_blocks_factor
end_size = (end_sector + 1) * sector_size
logging.debug(f'Truncating {file} to {end_block} blocks')
result = subprocess.run(['truncate', '-o', '-s', str(end_block), file])
logging.debug(f'({end_sector} + 1) sectors * {sector_size} bytes/sector = {end_size} bytes')
logging.info(f'Truncating {file} to {end_size} bytes')
result = subprocess.run(['truncate', '-s', str(end_size), file])
if result.returncode != 0:
raise Exception(f'Failed to truncate {file}')
partprobe(loop_device)