Tar test cases failing on systems with tape drives #2955
Description
If $TAPE is set tar uses the tape drive instead of stdout as default and tests fail
===> tar extension tests
tmp.tar : 29.84% ( 70.0 KiB => 20.9 KiB, tmp.tzst)
tmp.tzst : 71680 bytes
tar: /dev/nst0: Cannot open: No medium found
tar: Error is not recoverable: exiting now
tmp.tgz : 0 bytes
tar: /dev/nst0: Cannot open: No medium found
tar: Error is not recoverable: exiting now
tmp.txz : 0 bytes
tar: /dev/nst0: Cannot open: No medium found
tar: Error is not recoverable: exiting now
tmp.tlz4 : 0 bytes
zstd: tmp.t: unknown suffix (.zst/.tzst/.gz/.tgz/.lzma/.xz/.txz/.lz4/.tlz4 expected). Can't derive the output file name. Specify it with -o dstFileName. Ignoring.
zstd: tmp.tz: unknown suffix (.zst/.tzst/.gz/.tgz/.lzma/.xz/.txz/.lz4/.tlz4 expected). Can't derive the output file name. Specify it with -o dstFileName. Ignoring.
zstd: tmp.tzs: unknown suffix (.zst/.tzst/.gz/.tgz/.lzma/.xz/.txz/.lz4/.tlz4 expected). Can't derive the output file name. Specify it with -o dstFileName. Ignoring.