This was discovered while testing for the 0.28 release: `ch-convert /var/tmp/squash/centos7xz.sqf /var/tmp/tarballs/centos7xz.tar.gz` throws this error: ``` input: squash /var/tmp/squash/centos7xz.sqfs output: tar /var/tmp/tarballs/centos7xz.tar.gz Parallel unsquashfs: Using 36 processors 9807 inodes (9614 blocks) to write [=====================================================================================================================================================================================|] 9614/9614 100% created 7102 files created 965 directories created 378 symlinks created 0 devices created 0 fifos packing ... tar: ./etc/shadow-: Cannot open: Permission denied ] tar: ./etc/shadow: Cannot open: Permission denied tar: ./etc/gshadow-: Cannot open: Permission denied tar: ./etc/gshadow: Cannot open: Permission denied tar: Exiting with failure status due to previous errors 203MiB 0:00:01 [ <=> ] done ```