Re: [Qemu-devel] [Bug 1347555] Re: qemu build failure, hxtool is a bash script, not a /bin/sh script

[Eric Blake <eblake@redhat.com>]

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On 07/23/2014 10:13 AM, Felix von Leitner wrote:
> I actually have bash installed as /bin/sh and /bin/bash.
> But I also have heirloom sh installed, which installs itself as /sbin/sh, and that happened to be first in my $PATH.
> 
> Since the makefiles use "sh script" to run the scripts, that called the
> heirloom sh.
> 
> http://heirloom.sourceforge.net/sh.html
> 
> It is, it turns out, derived from OpenSolaris.  So there you go :-)
> 
> When I delete /sbin/sh, qemu builds.

Then the bug is not in qemu, but in your environment.  Installing
known-broken heirloom where it can be found first on a PATH search for
sh is just asking for problems, not just with qemu, but with all SORTS
of programs that expect POSIX semantics from a Linux /bin/sh.

Rather than change the Makefile to invoke the script with bash, we could
instead bend over backwards to rewrite the script in a way that works
with non-POSIX shells (as in, flag=`expr $flag ^ 1`), but that feels
backwards to me.  Until someone is actively worried about porting qemu
to a true Solaris environment, rather than just an heirloom-as-/bin/sh
Linux environment, I don't think it's worth the effort.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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