Add support to patch dep sources after download

Author: jwiltse

portable-python.yml

@@ -19,3 +19,10 @@ folders:
 cpython-additional-packages:
 #  - Pillow==10.0.0
 #  - flake8==6.0.0
+
+# Uncomment if you need to patch the source code of a module before compiling it
+#cpython-modules: zlib
+#zlib-patches:
+#  - file: configure
+#    regex: "# start off configure.log"
+#    replacement: "echo starting zlib configure script with patches"

src/portable_python/__init__.py

@@ -491,6 +491,9 @@ def is_usable_module(self, name):
     def cfg_version(self, default):
         return PPG.config.get_value("%s-version" % self.m_name) or default
 
+    def cfg_patches(self):
+        return PPG.config.get_value("%s-patches" % self.m_name)
+
     @property
     def url(self):
         """Url of source tarball, if any"""
@@ -639,6 +642,7 @@ def compile(self):
                         folder = folder / self.m_build_cwd
 
                     with runez.CurrentFolder(folder):
+                        self._apply_patches()
                         self._prepare()
                         func()
                         self._finalize()
@@ -652,6 +656,15 @@ def compile(self):
                     else:
                         os.environ[k] = v
 
+    def _apply_patches(self):
+        if patches := self.cfg_patches():
+            for patch in patches:
+                if runez.DRYRUN:
+                    print(f"Would apply patch: {patch}")
+                else:
+                    print(f"Applying patch: {patch}")
+                    patch_file(patch["file"], patch["regex"], patch["replacement"])
+
     def _get_env_vars(self):
         """Yield all found env vars, first found wins"""
         result = {}