in reply to How best test that a directory is a mount point of a mounted filesystem?

What's your OS? On my Linux system, I can open and read /proc/mounts to get the same thing mount would tell me.

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Re^2: How best test that a directory is a mount point of a mounted filesystem?
by Plankton (Vicar) on Jan 27, 2009 at 17:40 UTC
    The OS will most likely be Linux but this could get run a some legacy Solaris systems.
[reply]

      IIRC solaris uses /etc/mnttab, so you could do something like this:

      my ($mtab, $mounted);
$mounted = 0;
if($^O eq 'linux') {
  $mtab = '/etc/mnttab';
} else {
  $mtab = '/etc/mtab';
}
open my $mounts, "<$mtab" or die($!);
while(<$mounts>) {
  if($_ =~ /\S+ (\S+) .*/) {
    $mounted = 1 if($1 eq '/opt/mymountpoint');
  }
}

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        Sorry, I messed up with the file names. Obviously it needs to be the other way around ;)

        if($^O eq 'linux') {
  $mtab = '/etc/mtab';
} else {
  $mtab = '/etc/mnttab';
}

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        You could (and probably should) specify solaris for the else-clause, but I'm not sure what $^O yields on Solaris.. Probably just 'solaris'.

        Also don't forget to close the file after all that:

        close $mounts;
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