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tail: show end of device #8037

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tail: show end of device #8037

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martinkunkel2
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gnu coreutils will show end of device for block devices. In current implementation this is skipped as a block devices are recognized as untailable.

The change ensures that we first try to output the end of any file and only then tell the observer that the file is not observable.

@martinkunkel2 martinkunkel2 marked this pull request as draft May 30, 2025 15:21
@martinkunkel2 martinkunkel2 mentioned this pull request May 30, 2025
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@cakebaker cakebaker linked an issue May 30, 2025 that may be closed by this pull request
tail compatibility: tail does not output end of device #8036
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GNU testsuite comparison:

GNU test failed: tests/df/df-output. tests/df/df-output is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/sort/sort-stale-thread-mem. tests/sort/sort-stale-thread-mem is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/tail-sysfs. tests/tail/tail-sysfs is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/tail/end-of-device is no longer failing!

@martinkunkel2
tail: show end of device
1bab7ba 
gnu coreutils will show end of device for block devices.
In current implementation this is skipped as a block devices
are recognized as untailable.

The change ensures that we first try to output the end of any
file and only then tell the observer that the file is not
observable.
@github-actions GitHub Actions
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GNU testsuite comparison:

GNU test failed: tests/du/8gb. tests/du/8gb is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/sort/sort-stale-thread-mem. tests/sort/sort-stale-thread-mem is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/tail/end-of-device is no longer failing!
Note: The gnu test tests/du/2g is now being skipped but was previously passing.

@github-actions GitHub Actions
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GNU testsuite comparison:

GNU test failed: tests/sort/sort-stale-thread-mem. tests/sort/sort-stale-thread-mem is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/tail/end-of-device is no longer failing!
Note: The gnu test tests/du/2g is now being skipped but was previously passing.

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tail compatibility: tail does not output end of device
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