Hello, I've been tinkering with the tar format limitations and noticed that GNU tar (as of v1.30) misbehaves when given ustar-format archive created by bsdtar (from libarchive) and using 32-char long user/group name.
The output is: $ tar -tvf test.tar -rw-r--r-- verylongverylongverylongverylongverylongverylongverylongverylong000000 /verylongverylongverylongverylong000000 5 2018-11-24 09:28 input.txt Note that it does not enforce the 32-octet limit on the fields, and concatenates the values with the fields following them. I've already reported the issue to libarchive as well [1] since it seems to violate the POSIX ustar format but I suppose GNU tar might want to handle this problem more gracefully. To reproduce: useradd verylongverylongverylongverylong echo test > input.txt chown verylongverylongverylongverylong:verylongverylongverylongverylong input.txt bsdtar --format=ustar -cf test.tar input.txt tar -tvf test.tar [1]:https://github.com/libarchive/libarchive/issues/1093 -- Best regards, Michał Górny
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