eval and chroot strange behavior


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by recsky (Sexton)

on Apr 02, 2008 at 05:27 UTC ( #677892=perlquestion: print w/ replies, xml )

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recsky has asked for the wisdom of the Perl Monks concerning the following question:

Hi , I was writing a script and the -X file tests start to fail after some point. After search, they start to fail after this:

my @list = eval {chroot $config{root}; chdir "/"; qx / ldd $my_bin / }
+;
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In true the problem is the chroot, but I suppose that inside eval it not propagate in the rest program. Some tip or sugestion? Running at v5.8.8.

Comment on eval and chroot strange behavior Download Code
Re: eval and chroot strange behavior by pc88mxer (Vicar) on Apr 02, 2008 at 06:13 UTC
In true the problem is the chroot, but I suppose that inside eval it not propagate in the rest program. This is not the case. `eval` doesn't preserve your process's root directory. So if you change it with `chroot`, it remains changed until you change it again. One way you might be able to accomplish what you want to do is to execute your code in a child process and communicate the result back to the parent.	[reply] [d/l] [select]
Re^2: eval and chroot strange behavior by mattk (Pilgrim) on Apr 02, 2008 at 11:41 UTC
As above, and this is how you fix it: `my @list = qx{chroot $config{root} ldd $my_bin/};`	[reply] [d/l]

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