[oe] fetch race problem

[Steffen Sledz]

We hit the following problem in oe-classic. And we're not sure if this problem may occur in current oe too, or if it is fixed there.

They are two or more recipes (may be in different layers) for packages with sources from the same (git) repository. If the fetching from the repo needs some time we see "file changed as we read it" errors in all likelihood.

------------------> snip <-------------------
ERROR: Error evaluating '${PF}:${P}:${PN}:${BP}:${BPN}:files:.'
Traceback (most recent call last):
  File "/CACHE/jenkins-workspace/foo/bitbake/lib/bb/data_smart.py", line 116, in expandWithRefs
    s = __expand_var_regexp__.sub(varparse.var_sub, s)
  File "/CACHE/jenkins-workspace/foo/bitbake/lib/bb/data_smart.py", line 60, in var_sub
    var = self.d.getVar(key, 1)
  File "/CACHE/jenkins-workspace/foo/bitbake/lib/bb/data_smart.py", line 260, in getVar
    return self.expand(value, var)
  File "/CACHE/jenkins-workspace/foo/bitbake/lib/bb/data_smart.py", line 132, in expand
    return self.expandWithRefs(s, varname).value
  File "/CACHE/jenkins-workspace/foo/bitbake/lib/bb/data_smart.py", line 116, in expandWithRefs
    s = __expand_var_regexp__.sub(varparse.var_sub, s)
FetchError: Fetch command export HOME="/var/lib/jenkins"; export PATH="/CACHE/jenkins-workspace/foo/OE//bin:/CACHE/jenkins-workspace/foo/openembedded/bin:/CACHE/jenkins-workspace/foo/OE/tmp.7/sysroots/x86_64-linux/usr/armv5te/bin:/CACHE/jenkins-workspace/foo/OE/tmp.7/sysroots/x86_64-linux/usr/sbin:/CACHE/jenkins-workspace/foo/OE/tmp.7/sysroots/x86_64-linux/usr/bin:/CACHE/jenkins-workspace/foo/OE/tmp.7/sysroots/x86_64-linux/sbin:/CACHE/jenkins-workspace/foo/OE/tmp.7/sysroots/x86_64-linux//bin:/CACHE/jenkins-workspace/foo/OE/bin-HYP-6339:/CACHE/jenkins-workspace/foo/bitbake/bin:/sbin:/usr/sbin:/bin:/usr/bin"; tar -czf /var/lib/jenkins/sources/git_bitbucket.org.dresearchfe.drconfig.git.tar.gz ./.git/* failed with signal 1, output:
/bin/tar: ./.git/objects/pack/tmp_pack_BwThcc: File removed before we read it
/bin/tar: ./.git/objects/pack/tmp_pack_Ans7xK: File removed before we read it
/bin/tar: ./.git/objects/pack: file changed as we read it
------------------> snap <-------------------

Is this a problem in oe-core too (or oe-classic only)?

Any ideas how to avoid such errors?

Steffen

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