[Fwd: Bug#466717: gzip: option --color[=tty] doesn't work with option -H]

[Bdale Garbee]

One of the users of my Debian package of gzip points out that the zgrep
wrapper does not behave as expected when --color and -H are both called
for.  See the attached message for more detail.

Bdale

> --- Begin Message ---
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> Subject: 
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> Bug#466717: gzip: option --color[=tty] doesn't work with option -H
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> Date: 
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> Wed, 20 Feb 2008 16:21:17 +0100
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> User-agent: 
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> Mutt/1.5.17-vl-r19795 (2008-02-20)
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> Package: gzip
> Version: 1.3.12-5
> Severity: normal
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> Option --color with value 'tty' (the default) doesn't work with
> option -H (zgrep behaves as if --color weren't given). This is
> specific to zgrep (grep doesn't have this problem).
>
> To reproduce the bug:
>   echo foo > bar
>   zgrep --color -H o bar
>
> The cause is that when -H is given, the output of grep is filtered
> thus is no longer directly sent to a terminal. A possible fix would
> be to detect if the option --color[=tty] is given and if the zgrep
> output is on a terminal, and in such a case, replace the option by
> --color=always.
>
> -- System Information:
> Debian Release: lenny/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable'), (500, 'stable')
> Architecture: amd64 (x86_64)
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> Kernel: Linux 2.6.24-1-amd64 (SMP w/2 CPU cores)
> Locale: LANG=POSIX, LC_CTYPE=en_US.ISO8859-1 (charmap=ISO-8859-1)
> Shell: /bin/sh linked to /bin/bash
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> Versions of packages gzip depends on:
> ii  debianutils                   2.28.3     Miscellaneous utilities specific t
> ii  libc6                         2.7-8      GNU C Library: Shared libraries
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> gzip recommends no packages.
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> -- no debconf information
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> --- End Message ---