tac: yes ""|tac - file should show content of file without SIGPIPE

[oech3]

$  echo -e "1\n2\n3" > /tmp/3
$ yes ""|gnu-tac - /tmp/3
gnu-tac: /tmp/cutmpBYd5Ra: write error: Disk quota exceeded
3
2
1
$ yes ""|uu-tac - /tmp/3
fish: Process 1544, 'uu-tac' from job 1, 'yes ""|uu-tac - /tmp/3' terminated by signal SIGKILL (Forced quit)

[oech3]

@pixelb Does this simplify tests/tac/tac-continue.sh? Related with #9590 .
cc: @martinkunkel2

[pixelb]

Well actually filling /tmp is dangerous on a normal machine.
I'll probably adjust tac-continue.sh to be a root test that creates a small file system

[oech3]

Small FS based test would not work with uutils/tac as not using tmpfs. How about systemd-run? Ofcause GNU's test suite is something for GNU coreutls, not uutils. But what can uutils do to test this?

[pixelb]

Well $TMPDIR is part of the interface for tac, split, sort. I.e., would ideally be supported by uutils. How does uutils handle temp storage then for this use case?

[oech3]

Maybe, everything in RAM? (predicted from #9592).

[pixelb]

Right, unbounded RAM usage is a bug, and generally TMPDIR has better constraints in place, or has more capacity than RAM

[pixelb]

I'll probably adjust tac-continue.sh to be a root test that creates a small file system

Done in coreutils/coreutils@3c9d4fd

[oech3]

I guess uutils will switch to hybrid for performance.

[ChrisDryden]

This issue was resolved with this: #10094