Re: race condition... in cp?

[Paul Eggleton <paul.eggleton@linux.intel.com>]

On Friday 16 March 2012 06:58:40 James Limbouris wrote:
> Hi,
> 
> I got a strange error when bitbaking two images after removing some files in
> the deploy/images folder. It looks a whole lot like the cp's from the
> individual tasks were racing... I didn't know this sort of thing could
> happen.
> 
> bitbake rica-dev-image rica-release-example-image
> <...>
> NOTE: Resolving any missing task queue dependencies
> NOTE: multiple providers are available for runtime libssl
> (openssl-nativesdk, openssl) NOTE: consider defining a PREFERRED_PROVIDER
> entry to match libssl NOTE: Preparing runqueue
> NOTE: Executing SetScene Tasks
> NOTE: Executing RunQueue Tasks
> NOTE: Running task 3673 of 3692 (ID: 23,
> /home/james/oe/meta-rica5/recipes/images/rica-release-example-image.bb,
> do_rootfs) NOTE: Running task 3685 of 3692 (ID: 8,
> /home/james/oe/meta-rica5/recipes/images/rica-dev-image.bb, do_rootfs)
> NOTE: package rica-release-example-image-1.0-r0: task do_rootfs: Started
> NOTE: package rica-dev-image-1.0-r0: task do_rootfs: Started
> ERROR: Function failed: do_rootfs (see
> /home/james/oe/build/tmp-eglibc/work/rica5-rica-linux-gnueabi/rica-dev-imag
> e-1.0-r0/temp/log.do_rootfs.4011 for further information) ERROR: Logfile of
> failure stored in:
> /home/james/oe/build/tmp-eglibc/work/rica5-rica-linux-gnueabi/rica-dev-imag
> e-1.0-r0/temp/log.do_rootfs.4011
> Log data follows:
> | ERROR: Function failed: do_rootfs (see
> | /home/james/oe/build/tmp-eglibc/work/rica5-rica-linux-gnueabi/rica-dev-im
> | age-1.0-r0/temp/log.do_rootfs.4011 for further information) cp: cannot
> | create regular file
> | `/home/james/oe/build/tmp-eglibc/deploy/images/rica5/README_-_DO_NOT_DELE
> | TE_FILES_IN_THIS_DIRECTORY.txt': File exists
> NOTE: package rica-dev-image-1.0-r0: task do_rootfs: Failed
> ERROR: Task 8 (/home/james/oe/meta-rica5/recipes/images/rica-dev-image.bb,
> do_rootfs) failed with exit code '1' Waiting for 1 active tasks to finish:
> 0: rica-release-example-image-1.0-r0 do_rootfs (pid 4008)
> NOTE: package rica-release-example-image-1.0-r0: task do_rootfs: Succeeded
> NOTE: Tasks Summary: Attempted 3685 tasks of which 3683 didn't need to be
> rerun and 1 failed. pseudo: You must set the PSEUDO_PREFIX environment
> variable to run pseudo. pseudo: You must set the PSEUDO_PREFIX environment
> variable to run pseudo.
> 
> Summary: 1 task failed:
>   /home/james/oe/meta-rica5/recipes/images/rica-dev-image.bb, do_rootfs
> Summary: There was 1 ERROR message shown, returning a non-zero exit code.
> 
> Perhaps we should be using cp -f, or discarding the result?

I tried to use -n originally, but apparently that's not a standard option we 
can expect to be available everywhere so it had to be removed. I think in this 
case the easiest thing to do is just ignore the failure since if it's genuine 
it's not catastrophic and also it's highly unlikely you won't get a subsequent 
failure elsewhere. I'll prepare a fix.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre