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conda-forge / cppyy-feedstock

A conda-smithy repository for cppyy.
BSD 3-Clause "New" or "Revised" License
3 stars 4 forks source link

"cppyy" and "root" should be labeled as mutually incompatible #60

Closed jpivarski closed 2 years ago

jpivarski commented 2 years ago

Solution to issue cannot be found in the documentation.

Issue

Currently, it's possible to install the conda-forge packages cppyy and root in the same environment. However, their Python packages overshadow each other:

import cppyy

may try to load the Python library from the cppyy package or from the root package. (Which one wins depends on the order of sys.path.)

Is there some way to label these conda-forge packages as mutually incompatible at installation-time? They're mutually incompatible at runtime.

I'll also include the root-feedstock maintainers here: @chrisburr, @eguiraud, @henryiii.

Installed packages

Attempting to install in an empty environment (see Environment info, below), with only one channel, conda-forge (installed via Miniforge).

The problem is that it would allow this:

% mamba install cppyy root

Looking for: ['cppyy', 'root']

conda-forge/noarch                                 @   3.5MB/s  2.6s
conda-forge/linux-64                                22.1MB @   4.0MB/s  5.8s
Transaction

  Prefix: /home/jpivarski/mambaforge/envs/test-cppyy-root

  Updating specs:

   - cppyy
   - root

  Package                                      Version  Build                Channel                    Size
──────────────────────────────────────────────────────────────────────────────────────────────────────────────
  Install:
──────────────────────────────────────────────────────────────────────────────────────────────────────────────

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  + zipp                                         3.8.0  pyhd8ed1ab_0         conda-forge/noarch       Cached
  + zlib                                        1.2.11  h166bdaf_1014        conda-forge/linux-64     Cached
  + zstd                                         1.5.2  ha95c52a_0           conda-forge/linux-64     Cached

  Summary:

  Install: 224 packages

  Total download: 447MB

──────────────────────────────────────────────────────────────────────────────────────────────────────────────

Confirm changes: [Y/n]

Although I expect bad things to happen in theory, I decided to actually try it, too. Here's what happens after installation:

% python
Python 3.10.4 | packaged by conda-forge | (main, Mar 24 2022, 17:38:57) [GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cppyy
Fatal in <TROOT::InitInterpreter>: cannot load library /home/jpivarski/irishep/root-install/lib/libRIO.so: undefined symbol: _ZN7TThread3RunEPv

% python
Python 3.10.4 | packaged by conda-forge | (main, Mar 24 2022, 17:38:57) [GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
Fatal in <TROOT::InitInterpreter>: cannot load library /home/jpivarski/irishep/root-install/lib/libRIO.so: undefined symbol: _ZN7TThread3RunEPv

Environment info

Brand new environment:

% conda create -n test-cppyy-root
Collecting package metadata (current_repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /home/jpivarski/mambaforge/envs/test-cppyy-root

Proceed ([y]/n)? y

Preparing transaction: done
Verifying transaction: done
Executing transaction: done
#
# To activate this environment, use
#
#     $ conda activate test-cppyy-root
#
# To deactivate an active environment, use
#
#     $ conda deactivate

% conda activate test-cppyy-root
% conda list
# packages in environment at /home/jpivarski/mambaforge/envs/test-cppyy-root:
#
# Name                    Version                   Build  Channel
jpivarski commented 2 years ago

Oh, I should also mention the motivation: I was hunting down a performance issue, thinking that I was running cppyy from conda-forge, only to find out that I was actually running cppyy from a self-compiled copy of ROOT (not through conda-forge). That's my own problem—self-compiled software can always conflict with software installed through conda-forge—but it got me thinking about what would happen if someone installed both the cppyy and root packages from conda-forge, thinking they are independent and compatible because conda lets them do it.

saraedum commented 2 years ago

Maybe I misunderstand what you wrote above, but I think the real problem in your example is that it's picking up a root library from somewhere else, outside of the conda prefixes.

For me, import ROOT works fine. However, import cppyy complains with:

>>> import cppyy
(Re-)building pre-compiled headers (options: -O2); this may take a minute ...
In file included from input_line_10:9:
In file included from ./etc/dictpch/allHeaders.h:315:
./include/ROOT/TReentrantRWLock.hxx:28:19: error: use of undeclared identifier 'TVirtualRWMutex'
   using Hint_t = TVirtualRWMutex::Hint_t;

However, cppyy seems to be functional even though this error happpens.

saraedum commented 2 years ago

Can this be closed @jpivarski ?

If not, we would need to mark these packages as incompatible in the meta.yaml here and also patch the existing metadata.

jpivarski commented 2 years ago

You're right! I had intended to create a clean reproducer, but I see in the error output that it's getting ROOT from /home/jpivarski/irishep/root-install and that's causing an error. (My test environment wasn't clean enough.)

If you can't reproduce it in a clean environment, I guess it's fine. ROOT users very often install ROOT in several different ways, but the "conda way" is for everything to be installed from conda and that works here.

saraedum commented 2 years ago

Ok. I'll close this then. :)