ctypes.util.find_library raises FileNotFoundError for libsecp256k1 #93094
Description
Bug report
The following script
import ctypes
from ctypes import util
print(f'ctypes version {ctypes.__version__}')
print('Test foofoofoo')
print(f"returns: {util.find_library('foofoofoo')}\n")
print('Test secp256k1')
print(f"returns: {util.find_library('secp256k1')}\n")
print('Test libsecp256k1')
print(f"returns: {util.find_library('libsecp256k1')}\n")
gives the output:
ctypes version 1.1.0
Test foofoofoo
returns: None
Test secp256k1
returns: libsecp256k1.so.0
Test libsecp256k1
Traceback (most recent call last):
File "/home/<user>/programs/testctypes.py", line 14, in <module>
print(f"returns: {util.find_library('libsecp256k1')}\n")
File "/home/<user>/programs/anaconda3/envs/python310/lib/python3.10/ctypes/util.py", line 351, in find_library
_get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
File "/home/<user>/programs/anaconda3/envs/python310/lib/python3.10/ctypes/util.py", line 148, in _findLib_gcc
if not _is_elf(file):
File "/home/<user>/programs/anaconda3/envs/python310/lib/python3.10/ctypes/util.py", line 100, in _is_elf
with open(filename, 'br') as thefile:
FileNotFoundError: [Errno 2] No such file or directory: b'liblibsecp256k1.a'
find_library should not fail, but return None if nothing was found. In Ubuntu 20.04 this script runs without any exception.
Your environment
- ctypes version 1.1.0
- Operating system and architecture: Kubuntu 22.04 LTS x86_64, linux 5.15.0-27-generic
- Bug can be reproduced in python versions: python 3.10 (via anaconda and via ubuntu deb repositories), python 3.8 (via anaconda)
- The installed
libsecp256k1packages are
contains the files
/.
/usr
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libsecp256k1.so.0
/usr/lib/x86_64-linux-gnu/libsecp256k1.so.0.0.0
/usr/share
/usr/share/doc
/usr/share/doc/libsecp256k1-0
/usr/share/doc/libsecp256k1-0/changelog.Debian.gz
/usr/share/doc/libsecp256k1-0/copyright
And 
contains the files
/.
/usr
/usr/include
/usr/include/secp256k1.h
/usr/include/secp256k1_ecdh.h
/usr/include/secp256k1_extrakeys.h
/usr/include/secp256k1_preallocated.h
/usr/include/secp256k1_recovery.h
/usr/include/secp256k1_schnorrsig.h
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libsecp256k1.a
/usr/lib/x86_64-linux-gnu/libsecp256k1.so
/usr/lib/x86_64-linux-gnu/pkgconfig
/usr/lib/x86_64-linux-gnu/pkgconfig/libsecp256k1.pc
/usr/share
/usr/share/doc
/usr/share/doc/libsecp256k1-dev
/usr/share/doc/libsecp256k1-dev/changelog.Debian.gz
/usr/share/doc/libsecp256k1-dev/copyright
And in /usr/lib/x86_64-linux-gnu/ are the following relevant files containing secp256k1:
This bug was noticed in cryptoadvance/specter-desktop#1710