Date: Fri, 5 Sep 2008 20:31:35 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Joshua Piccari <jpiccari@bblocked.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Temp files in /etc Message-ID: <20080906033135.GA73919@icarus.home.lan> In-Reply-To: <15d3bc360809051940t70f0b884mb9a80132acc50b45@mail.gmail.com> References: <15d3bc360809051940t70f0b884mb9a80132acc50b45@mail.gmail.com>
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On Fri, Sep 05, 2008 at 07:40:13PM -0700, Joshua Piccari wrote: > Hi all, > I am setting up a few jails and I want them all to use the same /etc files > (with the exception of the files related to the password files and > databases), so I mounted a shared /etc folder as a nullfs with read-only > permissions. The problem is that using utilities like pw or chpass create > temporary files in /etc and that file system is mounted read-only. > So is there a way to force any utilities that create temp files in /etc to > use another location, something like /usr/local/etc for example? It depends entirely on how each individual program makes temporary files; there is no "standard". libc offers a many different methods of creating temporary files: tmpfile(3), tmpnam(3), tempnam(3), mktemp(3), and mkstemp(3). You can read the manpages to get an idea of how chaotic the situation is. Other programs may implement their own temporary file creation methods entirely, and may/may not support TMPDIR. I would try export TMPDIR="/some/place" and then attempt using pw and chpass, and see what happens. If they still attempt to use /tmp, said programs could probably be modified to support TMPDIR. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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