8000 `dd` fails on `tests/dd/not-rewound.sh` · Issue #3626 · uutils/coreutils · GitHub
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dd fails on tests/dd/not-rewound.sh #3626

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sylvestre opened this issue Jun 13, 2022 · 7 comments
Closed

dd fails on tests/dd/not-rewound.sh #3626

sylvestre opened this issue Jun 13, 2022 · 7 comments
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U - dd

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@sylvestre
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With the test case, it show b - with gnu, it shows bde:

export C=./target/debug/coreutils
echo abcde > in
echo "bde" > ref
($C dd skip=1 count=1 bs=1; $C dd skip=1 bs=1) < in > out 2> /dev/null 
diff -u ref out

comment the first line to come back on GNU

To run it:
bash util/run-gnu-test.sh tests/dd/not-rewound.sh

@sylvestre
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@jfinkels rings a bell ?

@jfinkels
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Yes! see #3008 (comment)

@sylvestre
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oh, thanks, it is a dup then :)

@sylvestre sylvestre closed this as not planned Won't fix, can't repro, duplicate, stale Jun 14, 2022
@sylvestre sylvestre moved this to Done in GNU Compatibility Jun 14, 2022
@ArtemSkrebkov ArtemSkrebkov mentioned this issue Jun 22, 2022
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@jfinkels
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Reopening as this seems to be broken still:

On GNU v8.30:

$ (dd skip=1 count=1 bs=1; dd skip=1 bs=1) < in > out 2> /dev/null && cat out
bde

On uutils dd (main branch, commit 0a385ee)

$ (./target/release/dd skip=1 count=1 bs=1; ./target/release/dd skip=1 bs=1) < in > out 2> /dev/null && cat out
de

@jfinkels jfinkels reopened this Nov 17, 2023
@jfinkels
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Another clue here is that this works as expected if stdout is not redirected to a file:

$ (./target/release/dd skip=1 count=1 bs=1; ./target/release/dd skip=1 bs=1) < in 2> /dev/null
bde

@jfinkels
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I think #4542 is getting at this issue.

@jfinkels jfinkels linked a pull request Nov 27, 2023 that will close this issue
dd: open stdout from file descriptor when possible #4542
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@RenjiSann
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RenjiSann commented Feb 28, 2025 •
edited
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Fixed by #7189

Using current main HEAD (commit d14ece90):

$ (dd skip=1 count=1 bs=1; dd skip=1 bs=1) < in > out 2> /dev/null && cat out
bde%
$ (./target/debug/dd skip=1 count=1 bs=1; ./target/debug/dd skip=1 bs=1) < in > out 2> /dev/null && cat out
bde%

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dd: open stdout from file descriptor when possible jfinkels/coreutils
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@jfinkels @sylvestre @RenjiSann
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