Conan: Error message "printing with scope==virtual" after successfull package creation

[fourbft]

For some of our sources a "conan create . user/channel" gives the following error after successfull creation of the conan package:

...

...
RadioServerData/1.0.1.a1dfa37-0@fourbft/testing: Package 'b388ba0b0edd88e6e90419f7ea5b89302de61533' created
RadioServerData/1.0.1.a1dfa37-0@fourbft/testing: Created package revision fee6c0874367d68fbbc44f64774b5b7d
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/conans/client/command.py", line 1579, in run
method(args[0][1:])
File "/usr/lib/python2.7/site-packages/conans/client/command.py", line 299, in create
test_build_folder=args.test_build_folder)
File "/usr/lib/python2.7/site-packages/conans/client/conan_api.py", line 93, in wrapper
return f(args, *kwargs)
File "/usr/lib/python2.7/site-packages/conans/client/conan_api.py", line 389, in create
test_build_folder, test_folder, conanfile_path)
File "/usr/lib/python2.7/site-packages/conans/client/cmd/create.py", line 53, in create
keep_build=keep_build)
File "/usr/lib/python2.7/site-packages/conans/client/manager.py", line 80, in install
installer.install(deps_graph, keep_build)
File "/usr/lib/python2.7/site-packages/conans/client/installer.py", line 302, in install
self._build(nodes_by_level, keep_build, root_node, graph_info)
File "/usr/lib/python2.7/site-packages/conans/client/installer.py", line 327, in _build
self._propagate_info(root_node)
File "/usr/lib/python2.7/site-packages/conans/client/installer.py", line 436, in _propagate_info
conan_file.output.info("Applying build-requirement: %s" % str(n.ref))
File "/usr/lib/python2.7/site-packages/conans/client/output.py", line 80, in info
self.writeln(data, Color.BRIGHT_CYAN)
File "/usr/lib/python2.7/site-packages/conans/client/output.py", line 53, in writeln
self.write(data, front, back, True)
File "/usr/lib/python2.7/site-packages/conans/client/output.py", line 119, in write
assert self.scope != "virtual", "printing with scope==virtual"
AssertionError: printing with scope==virtual

ERROR: printing with scope==virtual

This happens with Conan version 1.14.4. This error does not occur with Conan 1.13.1.
OS is Linux using Python 2.7.6.

As I said above, it does only occur with some (few) of our packages. Might be related to a specific (common?) upstream package, but not sure. Couldn't nail it down any further, yet, but maybe you have an idea.

[jgsogo]

I've been trying different things but I'm not able to reproduce the error. It looks like you are calling create over a package that is also somewhere else in your dependency graph 😕

I'll keep trying, but any hint will be really appreciated.

Thanks!

[memsharded]

Hi @fourbft

I have been checking the code too, and I can't see where this could happen. It would help to be able to reproduce it, if you don't want to post here private information, you could write to [email protected] with further details. Thanks.

[lasote]

Related: https://github.com/conan-io/conan/pull/4987#issuecomment-487179864

[fourbft]

Hi all,
thanks for your input. Sorry, I was busy on another project in the meantime, but now I am back on this problem.
Yes, the hint to the related topic seems to lead somewhere: We have two "build_requires" in the problematic package, as well (googlemock and googletest). When I move them to real "requires" (i. e. put them in the "requirements( self)" function instead of "build_requirements( self)" and use self.requires instead of self.build_requires), the problem is gone.

[fourbft]

Ok, another insight:
When I invert the order, in which I "build_require" googlemock and googletest, then the error disappears, too.
In our environment, googlemock requires (not build_requires) googletest.
If the problematic component above build_requires first googlemock and then googletest, I get the "printing with scope==virtual" error. When the problematic component first build_requires googletest and then googlemock, all is well.

[fourbft]

Ok, could reproduce the bug with three trivial components (only conanfile.py files). (See attached tar.gz, untar, cd to conan_printing_with_scope_virtual_bug_demo and start build_CA_through_CC.sh script.)
When you invert the order of the build_requires in the component CC, the error is gone.
conan_printing_with_scope_virtual_bug_demo.tar.gz

[jgsogo]

Thanks a lot for the example! There are a lot of tests, but no one like yours 😞. I've seen it is an issue related to _build requires_ when they are involved in diamond dependency, it also depends on the order of those build requires...

We'll try to fix it asap. Thanks again!

[memsharded]

Hi @fourbft

I am proposing a possible fix in https://github.com/conan-io/conan/pull/5056, to be included if ok in 1.14.5 release.

It would be great if you could run that branch from source against your project, to make sure everything is ok. Thanks!

[fourbft]

Hi @memsharded

just checked out your fix. Works, both for the example above and for our real world code. Problem solved! Thanks a lot!

[lasote]

Closed by https://github.com/conan-io/conan/pull/5056 to be released at 1.14.5

[lasote]

If you detect this still fail in some situations please comment and we will reopen! thanks