[ClusterLabs] ocf scripts shell and local variables

Dejan Muhamedagic dejanmm at fastmail.fm
Thu Sep 1 11:12:52 EDT 2016

On Wed, Aug 31, 2016 at 10:39:22AM -0500, Dmitri Maziuk wrote:
> On 2016-08-31 03:59, Dejan Muhamedagic wrote:
> >On Tue, Aug 30, 2016 at 12:32:36PM -0500, Dimitri Maziuk wrote:
> >>I expect you're being deliberately obtuse.
> >
> >Not sure why do you think that
> Because the point I was trying to make was that having shebang line say
> #!/opt/swf/bin/bash
> does not guarantee the script will actually be interpreted by
> /opt/swf/bin/bash. For example
> >When a file is sourced, the "#!" line has no special meaning
> >(apart from documenting purposes).
> (sic) Or when
> >I haven't read the code either, but it must be some of the
> >exec(2) system calls.
> it's execl("/bin/sh", "/bin/sh", "/script/file") instead of execl(
> "script/file', ...) directly.
> (As an aside, I suspect the feature where exec(2) will run the loader which
> will read the magic and load an appropriate binfmt* kernel module, may well
> also be portable between "most" systems, just like "local" is portable to
> "most" shell. I don't think posix specifies anything more than "executable
> image" and that on a strictly posix-compliant system execl( "/my/script.sh",
> ... ) will fail. I am so old that I have a vague recollection it *had to be*
> execl("/bin/sh", "/bin/sh", "/script/file") back when I learned it. But this
> going even further OT.)
> My point, again, was that solutions involving shebang lines are great as
> long as you can guarantee those shebang lines are being used on all
> supported platforms at all times.

There is no other way to tell the UNIX/Linux system which
interpreter to use. Or am I missing something?

> Sourcing findif.sh from IPAddr2 is proof
> by counter-example that they aren't and you can't.

findif.sh or any other file which is to be sourced therefore
must be compatible with the greatest common denominator



> Dima
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