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Date: Mon, 10 Jun 2024 13:41:52 +0200
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Subject: Re: Bug: bash redirect "magic" variable content to input of command
hangs (upstream of https://github.com/git-for-windows/git/issues/5001)
To: cygwin AT cygwin DOT com
References: <git-for-windows/git/issues/5001 AT github DOT com>
<git-for-windows/git/issues/5001/2157897799 AT github DOT com>
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From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
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Am 10.06.2024 um 13:12 schrieb Holger Klene via Cygwin:
> Hi Cygwin,
>
> On reading a magic value back from a bash variable, the involved command (wc, grep, cat, ...) hangs indefinitely and has to be stopped by Ctrl+C
>
> Editing it's content by deleting lines, the "magic" goes away. Also as demonstrated, other text-files (even twice the size) work fine.
>
> See this bash session:
> ---
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ wc -l magic.txt text.log
>    2074 magic.txt
>    4214 text.log
>    6288 insgesamt
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ md5sum magic.txt text.log
> 8ee7af38464d80a716d18d44c0a22f22 *magic.txt
> 0211535797c8d2e6b363f7dde147949f *text.log
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ cat magic.txt | wc -l
> 2074
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ cat text.log | wc -l
> 4214
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat magic.txt) && printf '%s\n' "$ctrl" | wc -l
> 2074
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat text.log) && printf '%s\n' "$ctrl" | wc -l
> 4214
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat text.log) && wc -l <<< "$ctrl"
> 4214
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat magic.txt) && wc -l <<< "$ctrl"
> <CTRL+C>
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat magic.txt) && grep hallo <<< "$ctrl"
> <CTRL+C>
>
>
> holgerk AT BX-NB-015 /cygdrive/c/Users/holgerk
> $ declare ctrl=$(cat magic.txt) && cat <<< "$ctrl"
> <CTRL+C>
Works for me.

> ---
>
> This is:
> GNU bash, Version 5.2.21(1)-release (x86_64-pc-cygwin)
>
> Was also reproduced in git-bash 5.2.26(1)-release (also cygwin)
> but not in WSL-bash 5.1.16 (independent of cygwin)
>
>
> Thanks
> Holger
>
> PS: I reported this to git first:
>
>
> Gesendet: Montag, 10. Juni 2024 um 11:58 Uhr
> Von: "Johannes Schindelin" <notifications AT github DOT com>
> An: "git-for-windows/git" <git AT noreply DOT github DOT com>
> Cc: "Holger Klene" <h DOT klene AT gmx DOT de>, "Mention" <mention AT noreply DOT github DOT com>
> Betreff: Re: [git-for-windows/git] bash redirect "magic" variable content to input of command hangs (Issue #5001)
>
> I just verified that this is happening in regular https://cygwin.com/ which, in this ticket's context is an upstream project of Git for Windows, as we use a slightly modified version of the Cygwin runtime as POSIX emulation layer that allows Bash to work.
> @hklene[https://github.com/hklene] would you mind reporting it there[https://cygwin.com/problems.html]?
> —
> Reply to this email directly, view it on GitHub[https://github.com/git-for-windows/git/issues/5001#issuecomment-2157897799], or unsubscribe.
>


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