Use pkg_resource to find resources files (data)

Doing this by hand is fraught with corner cases, and we're running into
some of those problems already. setuptools pkg_resource is a well tested
solution for not running into corner cases, and we already rely on
setuptools to make our entry point scripts work, so we might as well
make us of the other things it can solve for us.

Fixes #6801

1 files changed, 4 insertions, 2 deletions

diff --git a/mesonbuild/dependencies/base.py b/mesonbuild/dependencies/base.py
index 8b452cd..c0ec089 100644
--- a/mesonbuild/dependencies/base.py
+++ b/mesonbuild/dependencies/base.py
@@ -28,6 +28,8 @@ import typing as T
 from enum import Enum
 from pathlib import Path, PurePath
 
+import pkg_resources
+
 from .. import mlog
 from .. import mesonlib
 from ..compilers import clib_langs
@@ -1522,8 +1524,8 @@ class CMakeDependency(ExternalDependency):
         build_dir = self._get_build_dir()
 
         # Insert language parameters into the CMakeLists.txt and write new CMakeLists.txt
-        src_cmake = Path(__file__).parent / 'data' / cmake_file
-        cmake_txt = src_cmake.read_text()
+        # Per the warning in pkg_resources, this is *not* a path and os.path and Pathlib are *not* safe to use here.
+        cmake_txt = pkg_resources.resource_string('mesonbuild', 'dependencies/data/' + cmake_file).decode()
 
         # In general, some Fortran CMake find_package() also require C language enabled,
         # even if nothing from C is directly used. An easy Fortran example that fails