Error when using 'conan info .' (Conan 1.12.0)

[climblinne]

To help us debug your issue please explain:

• I've read the CONTRIBUTING guide.
• I've specified the Conan version, operating system version and any tool that can be relevant.
• I've explained the steps to reproduce the error or the motivation/use case of the question/suggestion.

I tested Conan 1.12.0 and got the following error:

conan info .
Traceback (most recent call last):
  File "c:\tools\python3\lib\site-packages\conans\client\command.py", line 1495, in run
    method(args[0][1:])
  File "c:\tools\python3\lib\site-packages\conans\client\command.py", line 555, in info
    build=args.dry_build)
  File "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 88, in wrapper
    return f(*args, **kwargs)
  File "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 613, in info
    settings, options, env)
  File "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 579, in _info_args
    self._cache, self._user_io.out)
  File "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 971, in get_graph_info
    graph_info = GraphInfo.load(install_folder)
  File "c:\tools\python3\lib\site-packages\conans\model\graph_info.py", line 27, in load
    return GraphInfo.loads(load(p))
  File "c:\tools\python3\lib\site-packages\conans\model\graph_info.py", line 41, in loads
    root = graph_json["root"]
KeyError: 'root'

ERROR: 'root'

It works under 0.11.2.

This happens on a library with the following conanfile:

from conans import python_requires

base = python_requires("base_library/0.1@demo/testing")

class mytest_Conan(base.BaseLibrary):
    name = "mytest"
    url = "something"
    description = "something"
    scm = base.BaseLibrary.get_git_scm_data()
    version = base.BaseLibrary.get_git_version()

No dependent package in the requirements.

[jgsogo]

Hi @climblinne,

v1.12.0 includes this PR (#4197), it is adding more information to a file called graph_info.json that is created within the install command. Now (>=1.12.0) that file contains a root node that was not present in previous versions and Conan is failing to load the file.

If you remove that file or run conan install . again the file will be regenerated and the error will be gone. Hope this fixes your issue, nevertheless we should provide better information when loading the graph_info.json file (I'll open an issue for this).

IMHO, I think that this issue doesn't require a minor.

Thanks!

[climblinne]

Yes, thanks with conan install . it works. Thanks

[jgsogo]

I've opened a PR handling this exception to add better error message, with that change it should have been something like:

ERROR: Error parsing GraphInfo from file '/Users/jgsogo/dev/conan/issues/tmp2/graph_info.json': Error related to GraphInfo text content: Required node 'root' is not present

[lasote]

Anyway, it shouldn't crash. We will try to fix it in the 1.12.1 minor.

[memsharded]

Fixed, it won't crash anymore, will be released in 1.12.1