Date: Fri, 6 Aug 2010 07:20:03 GMT From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/149335: shell script runs on Linux but not on freebsd Message-ID: <201008060720.o767K3qI068650@freefall.freebsd.org>
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The following reply was made to PR misc/149335; it has been noted by GNATS.
From: Oliver Fromme <olli@lurza.secnetix.de>
To: eb30750@gmail.com, freebsd-bugs@FreeBSD.ORG, bug-followup@FreeBSD.ORG
Cc:
Subject: Re: misc/149335: shell script runs on Linux but not on freebsd
Date: Fri, 6 Aug 2010 09:12:40 +0200 (CEST)
Paul Lambert wrote:
> > Number: 149335
> > Category: misc
> > Synopsis: shell script runs on Linux but not on freebsd
> [...]
> > Environment:
> FreeBSD BRSINC-VM02.local 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC 2010 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
> > Description:
> The script fails on these two lines so far; "stat" and "od"
>
> # This won't work with non-GNU stat.
> FILE_SIZE=`stat --format "%s" "$0"`
> offset=$(($FILE_SIZE - 4))
As the comment suggests, that command is non-portable and
works with GNU stat (linux) only. This is not a standard.
The equivalent BSD command line would be:
FILE_SIZE=`stat -f %z "$0"`
I wonder why the script even needs to find out its own size,
and then read binary data from itself?!? Is this some kind
of "copy protection" or similar tricks? If so, I suspect
that it is highly non-portable and will be difficult to get
to run on anything else than linux.
> # XXX: put extraction in its own function
> MAGIC_NUMBER=`od -An -t u4 -N 4 -j $MAGIC_OFFSET "$file" | tr -d ' '`
This command works fine on FreeBSD 8.1. If it doesn't work
in the context of the script, I suspect that it is caused
by preceding problems that set one of the variables to a
wrong value.
As a work-around, you might try running the script with
/compat/linux/bin/sh instead of /bin/sh. You need to
enable Linux compatibility ("kldload linux") and install
ports/emulators/linux_base-f10 if you don't have it already.
As this is not a bug in FreeBSD, I suggest that this PR can
be closed. Do you agree?
Best regards
Oliver
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