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import subprocess
import os
import shutil
class ContainerError(Exception):
pass
def join_layers(input_paths, output_path, squashfs_path):
if len(input_paths) == 1:
shutil.copy2(input_paths[0], output_path)
else:
# We cannot use appending here as it doesn't allow replacing files
for input_path in input_paths:
unpack_cmd = [os.path.join(squashfs_path, 'unsquashfs')]
unpack_cmd.extend(['-f', input_path])
subprocess.run(unpack_cmd)
pack_cmd = [os.path.join(squashfs_path, 'mksquashfs')]
pack_cmd.append(os.path.join(os.curdir, 'squashfs-root'))
pack_cmd.append(output_path)
pack_cmd.append('-all-root')
subprocess.run(pack_cmd)
shutil.rmtree(os.path.join(os.curdir, 'squashfs-root'))
return 0
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