nice: Remove unsafe and reduce bin size

[oech3]

• Replace 2 unsafe libc usage and nix with rustix (which is already dep)
• protect util name against binary name
  1211576 -> 1210344 byte
  Closes nice: replace nix and libc with rustix #11488

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/pr/bounded-memory (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/tail/pipe-f is now being skipped but was previously passing.

[sylvestre]

Replace 2 unsafe libc usage and nix with rustix (which is #9549)

Sure it is already a transitive dep but you are adding a third way to call system libs ?! :/
it won't simplify our code base

[oech3]

Ofcause this makes additional way to call systel libs, but I want to do that since

• rustix mathes with Rust's Ok and Err style
• rustix tries to call syscall directly (bypass linker's overhead)
• We can try to remove nix in the future (I now it is hard to that soon)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/resolution (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/follow-name (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/cut/cut-huge-range is now being skipped but was previously passing.
Note: The gnu test tests/seq/seq-epipe is now being skipped but was previously passing.

[codspeed-hq]

Merging this PR will improve performance by 13.59%

⚡ 1 improved benchmark
✅ 299 untouched benchmarks
⏩ 46 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	cp_recursive_deep_tree[(120, 4)]	699.2 KB	615.6 KB	+13.59%

---

_{Comparing oech3:nice-rustix (91ce3c1) with main (ac72aa8)}

Footnotes

1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[xtqqczze]

Can we use nix to remove the unsafe?

[oech3]

Can we use nix to remove the unsafe?

I don't think so. This PR removed 2 unsafe, but it looks accidentaly happened.
Forget this

[oech3]

Please close #9549 if you don't agree with this PR.

[oech3]

But uutils previously replaced chrono with jiff with many PRs. Why cannot we do same things?

[sylvestre]

But uutils previously replaced chrono with jiff with many PRs. Why cannot we do same things?

Because chrono had plenty of limitations

[oech3]

This PR is not for the case, but cannot we start migration until

if it would be useful to move some of the nix usage over to rustix for the windows support

or #9549 (comment) was applied?

[oech3]

Can we use nix to remove the unsafe?

I tried. But I cannot do that soon. Feel free to replace this PR.
It is sad that I cannot see any progeess for #9549 for a while...