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Message-ID: <3c32af40804150405qb2bbfbavb8d7ce575dbc2278@mail.gmail.com>
Date: Tue, 15 Apr 2008 13:05:26 +0200
From: "Santiago M. Mola" <coldwind@gentoo.org>
Sender: cooldwind@gmail.com
To: gentoo-dev@lists.gentoo.org
Subject: Re: [gentoo-dev] escaping variables in sed expressions
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On Tue, Apr 15, 2008 at 1:14 PM, Marijn Schouten (hkBst)
<hkBst@gentoo.org> wrote:
>
> Hi list,
>
> it seems I have been using some fragile sed expression and I'd like to tap
> the collective
> wisdom for avoiding doing that in the future.
>
> dev-scheme/slib-3.1.5-r1 currently does
>
> sed "s_prefix = /usr/local/_prefix = ${D}/usr/_" -i Makefile
>
> to make it not violate the sandbox. However a user had set
> PORTAGE_TMPDIR=/home/gentoo_overflow/tmp causing the sed expression to
> contain too may
> underscores and failing.[1]
>
> There are several option to handle this. I could use a less common
> delimiter or I could
> escape it: ${D//_/\_} instead of ${D}. I could use a sed expression that
> doesn't suffer
> from this problem (thanks to dleverton):
>
> sed -ne '\_^prefix = /usr/local_!{p;d}' -e "iprefix = ${D}" -i Makefile
>
> Comments?
>
Currently is use ':' as sed delimiter when paths are involved. I'd
also like to hear from you about proper delimiters if you think ':' is
not safe enough.
AFAIK, the only corner case which would make this fail would be
Windows paths (C:/gentoo-prefix).
Regards,
--
Santiago M. Mola
Jabber ID: cooldwind@gmail.com
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