BLD Run build/post script inside the unpacked wheel directory

docs/development/meta-yaml.md

@@ -198,10 +198,9 @@ is the source directory.
 
 ### `build/post`
 
-Shell commands to run after building the library. This script is run by `bash`
-in the directory where `meta.yaml` file resides. The `${PKG_BUILD_DIR}/dist`
-will contain the built wheel unpacked with `python -m wheel unpack`
-so it's possible to manually add, delete, change, move files etc.
+Shell commands to run after building the package. This command runs
+in the directory which contains the built wheel unpacked with
+`python -m wheel unpack`. So it's possible to manually add, delete, change, move files etc.
 See the [setuptools meta.yaml](https://github.com/pyodide/pyodide/
 blob/main/packages/setuptools/meta.yaml)
 for an example of the usage of this key.

packages/matplotlib/meta.yaml

@@ -36,7 +36,6 @@ build:
     -fexceptions
   script: export SETUPTOOLS_SCM_PRETEND_VERSION=$PKG_VERSION
   post: |
-    cd $WHEELDIR
     rm -rf matplotlib/backends/qt_editor
     rm -rf matplotlib/backends/web_backend
     rm -rf sphinxext

packages/numpy/meta.yaml

@@ -17,7 +17,6 @@ build:
   # numpy creates numpy/distutils/__pycache__ directory during the build.
   # It breaks our test because there is a .pyc in the directory.
   post: |
-    cd $WHEELDIR
     rm -rf numpy/distutils/__pycache__
   cflags: |
     -Wno-return-type

packages/rebound/meta.yaml

@@ -8,8 +8,8 @@ build:
   post: |
     mkdir -p $WASM_LIBRARY_DIR/include/rebound/
     mkdir -p $WASM_LIBRARY_DIR/lib/
-    cp $WHEELDIR/rebound/*.h $WASM_LIBRARY_DIR/include/rebound/
-    cp $WHEELDIR/librebound.cpython-*.so $WASM_LIBRARY_DIR/lib/
+    cp rebound/*.h $WASM_LIBRARY_DIR/include/rebound/
+    cp librebound.cpython-*.so $WASM_LIBRARY_DIR/lib/
 
 source:
   url: https://files.pythonhosted.org/packages/5c/66/7564ac591bb088d7f35a59d560b5c26426bb8ef5415522232819fe11c45a/rebound-3.24.2.tar.gz

packages/setuptools/meta.yaml

@@ -10,7 +10,7 @@ source:
   sha256: 3d8083eed2d13afc9426f227b24fd1659489ec107c0e86cec2ffdde5c92e790b
 build:
   post: |
-    find $WHEELDIR -name '*.exe' -delete
+    find . -name '*.exe' -delete
 requirements:
   run:
     - pyparsing

pyodide-build/pyodide_build/buildpkg.py

@@ -429,10 +429,9 @@ def _package_wheel(
             # update so abi tags after build is complete but before running post script
             # to maximize sanity.
             replace_so_abi_tags(wheel_dir)
-
-            bash_runner.env.update({"WHEELDIR": str(wheel_dir)})
-
-            bash_runner.run(self.build_metadata.post, script_name="post script")
+            bash_runner.run(
+                self.build_metadata.post, script_name="post script", cwd=wheel_dir
+            )
 
             if self.build_metadata.vendor_sharedlib:
                 lib_dir = Path(get_build_flag("WASM_LIBRARY_DIR"))