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For now, the download post-process logic uses mk_tar_gz, which repacks a tarball compressed with gzip. So we can only accept as input a tarball also compressed with gzip. To enforce that, this commit changes post_process_unpack() to use tar xzf. This makes sure that if a tarball compressed with something else than gzip gets used, it will bail out and we will notice. Support for other compression schemes can be added later on. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>