Fix the debug results in cp --debug

[AnirbanHalder654322]

Fixes #5715
If this passes , i can close my other pr #6130 . This pr contains the changes of that one too in a more structured way.

Passes compatibility tests

• tests/cp/sparse-perf.sh
• tests/cp/sparse-2.sh
• tests/cp/sparse-extents.sh
• tests/cp/sparse-extents-2.sh

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/cp/same-file. tests/cp/same-file is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)
GNU test failed: tests/cp/cross-dev-symlink. tests/cp/cross-dev-symlink is passing on 'main'. Maybe you have to rebase?

[sylvestre]

GNU testsuite comparison:

GNU test failed: tests/cp/same-file. tests/cp/same-file is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)
GNU test failed: tests/cp/cross-dev-symlink. tests/cp/cross-dev-symlink is passing on 'main'. Maybe you have to rebase?

interesting, they are marked as passing in the log but don't show here?!

2024-04-14T08:02:24.9545868Z PASS: tests/cp/sparse-extents.sh
2024-04-14T08:02:25.3753424Z PASS: tests/cp/sparse-perf.sh
2024-04-14T08:02:25.6187557Z PASS: tests/cp/sparse-2.sh
[...]
2024-04-14T08:02:59.5016730Z PASS: tests/cp/sparse-extents-2.sh

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/cp/same-file. tests/cp/same-file is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cp/cross-dev-symlink. tests/cp/cross-dev-symlink is passing on 'main'. Maybe you have to rebase?

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)

[sylvestre]

a clippy warning:

error: casting integer literal to `u8` is unnecessary
    --> tests/by-util/test_cp.rs:3961:25
     |
3961 |     let filler_bytes = [0 as u8; 10000];
     |                         ^^^^^^^ help: try: `0_u8`
     |

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/factor/factor is no longer failing!

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)

[AnirbanHalder654322]

a clippy warning:

error: casting integer literal to `u8` is unnecessary
    --> tests/by-util/test_cp.rs:3961:25
     |
3961 |     let filler_bytes = [0 as u8; 10000];
     |                         ^^^^^^^ help: try: `0_u8`
     |

@sylvestre fixed it now.

[sylvestre]

I still don't get why we didn't get a comment but well done :)

Warning: Changes from 'main': PASS +4 / FAIL +1 / ERROR +0 / SKIP -5 

2024-04-21T14:14:08.9573439Z PASS: tests/cp/sparse-extents.sh
2024-04-21T14:14:09.3762254Z PASS: tests/cp/sparse-perf.sh
2024-04-21T14:14:09.5998242Z PASS: tests/cp/sparse-2.sh
...

any idea @tertsdiepraam ?
https://github.com/uutils/coreutils/actions/runs/8773385445/job/24073401789 doesn't say much

[sylvestre]

we see it here:
https://github.com/uutils/coreutils-tracking/

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  "Mon, 22 Apr 2024 15:59:55 +0000": {
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