Mach XFree86 build error - preferred workaround?

[Thomas Vander Stichele]

On Thu, 2004-03-04 at 23:03, John Dalbec wrote:
> Building XFree86 fails with:
> 
> egrep: /proc/stat: no such file or directory

Can you check if proc gets mounted when you go inside the chroot ?
(I still need a good clean solution for /proc and its contents; mounting
it is bad, and not mounting it is bad too :))

> This is the offending section of the .spec file:
> 
> %if %{ParallelBuild}
> numprocs=$(( $(egrep -c ^cpu[0-9]+ /proc/stat || :) * 2 ))
> [ "$numprocs" = "0" ] && numprocs=1
> echo "PARALLEL MAKE ENABLED: numprocs=$numprocs"
> %else
> numprocs=1
> %endif

Hm, that looks wonky.  I wouldn't use code like this.

Here's what mach uses to check number of cpu's:
            if not os.environ.has_key('RPM_BUILD_NCPUS'):
               nrcpus =
os.popen('/usr/bin/getconf_NPROCESSORS_ONLN').read().rstrip()
            else:
               nrcpus = os.environ['RPM_BUILD_NCPUS']

also, I don't see the rest of the spec file, so not sure what you're
trying to achieve there.  But, in general, a spec file should just do
make %{_smp_flags}

> Is there a mach-compatible way to accomplish the same thing?
> 
> Should I add /proc/stat as a BuildRequires?

Ugh, no :) I don't think that would work, /proc is not a real
filesystem.

> I'm trying various workarounds to be able to access /proc/stat, but it doesn't 
> help that the build is run as a non-root user.  My latest attempt is to add 
> "none /proc proc defaults,user 0 0" to /etc/fstab and add the "mount" commands 
> below:
> 
> %if %{ParallelBuild}
> [ -f /proc/stat ] || mount /proc || mount /proc -o remount || :
> numprocs=$(( $(egrep -c ^cpu[0-9]+ /proc/stat || :) * 2 ))
> [ "$numprocs" = "0" ] && numprocs=1
> echo "PARALLEL MAKE ENABLED: numprocs=$numprocs"
> %else
> numprocs=1
> %endif

that's hacking around the actual problem.  Let's try to fix it in a
clean way; no spec file should ever try to mount stuff.

> The remount is because /etc/mtab seems to have mount entries for /proc already.
> My workaround appears to have worked.  At least the scrolling is much faster 
> now.

What do you mean, scrolling is much faster ?
> Does mach require a terminal? 

I'm pretty sure that the terminal inside the chroot is not set
correctly, but I never figured out which I'm supposed to use anyway.  If
anyone can tell me what TERM should be set to, feel free.  I don't think
it's a big problem though atm.

>  I tried redirecting stdout and stderr and I still 
> got status messages printed to the terminal.

You did this from inside the chroot then ?

>   I've closed my SSH window.  Will 
> mach wait for TTY output all night instead of building the package?

Can you give me some more background as to what exactly you're doing ?
I'm getting the feeling you're using it differently than what I usually
do.  That's not necessarily bad, I'm just not sure if you're using it in
a way that I've actually made to work :)

Thomas


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