Date: Tue, 8 Jan 2013 22:46:26 +0100 From: Polytropon <freebsd@edvax.de> To: Fbsd8 <fbsd8@a1poweruser.com> Cc: FreeBSD questions <questions@freebsd.org> Subject: Re: sh script problem with capturing return code Message-ID: <20130108224626.8c2d89cd.freebsd@edvax.de> In-Reply-To: <50EC9009.3030305@a1poweruser.com> References: <50EC9009.3030305@a1poweruser.com>
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On Tue, 08 Jan 2013 16:30:49 -0500, Fbsd8 wrote:
>
> I can not get the return code from mtree to control
> the displaying of a error message.
>
> The mtree at the end of the script does function correctly
> because I can tell from the printed output.
>
> When mtree prints comments saying "extra" that means the directory being
> read does not match the specification file. return code should be Not
> equal to zero.
>
> And when they do match IE: no mtree comments printed, that should be a
> return code of zero.
>
> I tried 2 different ways to capture the return code to no joy.
> What I am doing wrong?
>
> #! /bin/sh
> flavor="/a/mtree.std"
> echo "flavor = ${flavor}"
> /bin/cat << EOF |
> /set type=dir uname=root gname=wheel
> .
> etc ignore
> ..
> root ignore
> ..
> usr
> home ignore
> ..
> local
> etc ignore
> ..
> ..
> ..
> ..
> EOF
>
> mtree -d -u -p "${flavor}" || \
> echo "Error invalid directories in flavor ${flavor}."
>
> #mtree -d -p "${flavor}"
> #[ $? -eq 0 ] || \
> # echo "Error invalid directories in flavor ${flavor}."
> echo "return = $?"
It seems that returning 0 is correct in a case as you mentioned.
The manual at "man mtree" states:
EXIT STATUS
The mtree utility exits 0 on success, and >0 if an error occurs.
Question: What _is_ an error here?
If you use the source Luke at /usr/src/usr.sbin/mtree/mtree.c,
you could find out what combination of options plus circumstances
found at runtime could trigger an exit status != 0.
The main() functions finishes with exit(status); where status
is either set by functions mtree_specspec() or mtree_verifyspec(),
or manually to 0 when -U is provided and MISMATCHEXIT (is 2) is
encountered.
Again from the manual:
-u Same as -U except a status of 2 is returned if the file hierarchy
did not match the specification.
-U Modify the owner, group, permissions, and modification time of
existing files to match the specification and create any missing
directories or symbolic links. User, group and permissions must
all be specified for missing directories to be created. Corrected
mismatches are not considered errors.
However, you're not using -U, but -u, so the last sentence of
the description above should be relevant: No error per se,
even though the status code should be 2.
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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