test: interface_ipc.py (might?) start skipping if installed capnp version changes #34016

1. 
   fanquake commented at 2:38 pm on December 5, 2025: member

   Noticed this on a Fedora (Rawhide) Box that has capnp 1.2.0 (recently updated from 1.1.0) and pycapnp 2.1.0 installed, but was skipping interface_ipc.py as if the Python module was not available. The failure was that pycanp 2.1.0 tries to load an older shared lib, and fails:

    0Remaining jobs: [interface_ipc.py]
    11/1 - interface_ipc.py failed, Duration: 0 s
    2
    3stdout:
    4
    5
    6stderr:
    7Traceback (most recent call last):
    8  File "/root/ci_scratch/build/test/functional/interface_ipc.py", line 20, in <module>
    9    import capnp  # type: ignore[import] # noqa: F401
   10    ^^^^^^^^^^^^
   11  File "/usr/local/lib64/python3.14/site-packages/capnp/__init__.py", line 36, in <module>
   12    from .version import version as __version__
   13  File "/usr/local/lib64/python3.14/site-packages/capnp/version.py", line 1, in <module>
   14    from .lib.capnp import _CAPNP_VERSION_MAJOR as LIBCAPNP_VERSION_MAJOR  # noqa: F401
   15    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   16ImportError: libcapnpc.so.1.0.1: cannot open shared object file: No such file or directory
   

   We catch this and skip as if the module isn’t available. Updating to pycapnp 2.2.1 solved the issue.

2. fanquake added the label Tests on Dec 5, 2025
3. 
   ryanofsky commented at 3:46 pm on December 5, 2025: contributor

   Maybe this would get the failure to be reported properly:

   0--- a/test/functional/interface_ipc.py
   1+++ b/test/functional/interface_ipc.py
   2@@ -19,7 +19,7 @@ from test_framework.wallet import MiniWallet
   3 # Test may be skipped and not have capnp installed
   4 try:
   5     import capnp  # type: ignore[import] # noqa: F401
   6-except ImportError:
   7+except ModuleNotFoundError:
   8     pass [@asynccontextmanager](/bitcoin-bitcoin/contributor/asynccontextmanager/)
   

4. 
   fanquake commented at 4:01 pm on December 5, 2025: member

   @ryanofsky yes, that works.

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fanquake ryanofsky

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