Fix cp --sparse=auto not creating sparse-files.

[AnirbanHalder654322]

Fixes #6129

• Adds sparse-copy as clone fallback
• Uses the sparse-copy fallback for sparse=auto invocations.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/cp/sparse-to-pipe. tests/cp/sparse-to-pipe is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/head/head-c. tests/head/head-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/od/od-j. tests/od/od-j is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/tail-c. tests/tail/tail-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/wc/wc-proc. tests/wc/wc-proc is passing on 'main'. Maybe you have to rebase?

[sylvestre]

GNU testsuite comparison:

GNU test failed: tests/cp/sparse-to-pipe. tests/cp/sparse-to-pipe is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/head/head-c. tests/head/head-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/od/od-j. tests/od/od-j is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/tail-c. tests/tail/tail-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/wc/wc-proc. tests/wc/wc-proc is passing on 'main'. Maybe you have to rebase?

these are probably yours

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/head/head-c. tests/head/head-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/od/od-j. tests/od/od-j is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/tail-c. tests/tail/tail-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/wc/wc-proc. tests/wc/wc-proc is passing on 'main'. Maybe you have to rebase?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/head/head-c. tests/head/head-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/od/od-j. tests/od/od-j is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)
GNU test failed: tests/tail/tail-c. tests/tail/tail-c is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/wc/wc-proc. tests/wc/wc-proc 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]

Could you please add tests?

[AnirbanHalder654322]

Could you please add tests?

Added tests .

[github-actions]

GNU testsuite comparison:

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

[github-actions]

GNU testsuite comparison:

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

[github-actions]

GNU testsuite comparison:

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

[BenWiederhake]

The overall code changes look good to me, but someone else should merge it.

In particular, I'm unhappy with squashing it all into a single commit, but I'm also unhappy with 39 fix-fixing commits ^^'

EDIT: Also, please see ./tests/by-util/test_cp.rs:2349:22 - Unknown word (unsuccesful) fix: (unsuccessful)

[AnirbanHalder654322]

The overall code changes look good to me, but someone else should merge it.

In particular, I'm unhappy with squashing it all into a single commit, but I'm also unhappy with 39 fix-fixing commits ^^'

EDIT: Also, please see ./tests/by-util/test_cp.rs:2349:22 - Unknown word (unsuccesful) fix: (unsuccessful)

Sorry for the bad commit hygiene . Do i do another commit to fix the spelling ? ;(

[BenWiederhake]

commit hygiene: No worries, no damage has been done! :D
I see at least three ways forward: You could rebase/squash some of the commits, or if that's too much effort just squash everything into a single commit, or someone else squashes the entire PR into a single commit. In either case, I already did enough damage for today (I messed up a different PR), so I'm not going to merge anything today.

spelling: Yes, please fix the typo in whatever way you think is best.

[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]

Will let someone else squash , i am too bad at git :(

[BenWiederhake]

Those match arms look like they're repeating, and the error types should be compatible. Can this be simplified? EDIT: Nope, they can't be simplified. All is good.

[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]

Closed in favor of #6220