Fix rez executables aren't removed in windows install

.github/workflows/installation.yaml

@@ -1,6 +1,12 @@
 name: installation
 on:
-  push:
+  pull_request:
+    paths:
+      - 'src/**'
+      - '.github/workflows/installation.yaml'
+      - '!src/rez/utils/_version.py'
+      - '!**.md'
+  push:  
     paths:
       - 'src/**'
       - '.github/workflows/installation.yaml'
@@ -9,22 +15,50 @@ on:
 
 jobs:
   main:
-    name: ${{ matrix.python-version }} - ${{ matrix.method }}
-    runs-on: ubuntu-latest
+    name: ${{ matrix.os }} - ${{ matrix.python-version }} - ${{ matrix.method }}
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: 
+          - ubuntu-latest
+          - macOS-latest
+          - windows-2019
         python-version:
           - '2.7'
           - '3.7'
         method:
-          - 'python ./install.py'
-          - 'pip install --target /opt/rez .'
-        include:
-          - method: 'python ./install.py'
-            exports: 'PATH=${PATH}:/opt/rez/bin/rez'
-          - method: 'pip install --target /opt/rez .'
-            exports: 'PATH=${PATH}:/opt/rez/bin PYTHONPATH=${PYTHONPATH}:/opt/rez'
+          - 'install'
+          - 'pip'
 
+        include:
+        # ubuntu
+        - os: ubuntu-latest
+          method: install          
+          REZ_SET_PATH_COMMAND: 'export PATH=${PATH}:/opt/rez/bin/rez'
+          REZ_INSTALL_COMMAND: 'python ./install.py /opt/rez'
+        - os: ubuntu-latest
+          method: pip
+          REZ_SET_PATH_COMMAND: 'export PATH=${PATH}:/opt/rez/bin PYTHONPATH=${PYTHONPATH}:/opt/rez'
+          REZ_INSTALL_COMMAND: 'pip install --target /opt/rez .'
+        # macOS
+        - os: macOS-latest
+          method: install
+          REZ_SET_PATH_COMMAND: 'export PATH=${PATH}:~/rez/bin/rez'
+          REZ_INSTALL_COMMAND: 'python ./install.py ~/rez'
+        - os: macOS-latest
+          method: pip
+          REZ_SET_PATH_COMMAND: 'export PATH="$PATH:~/rez/bin" PYTHONPATH=$PYTHONPATH:$HOME/rez'
+          REZ_INSTALL_COMMAND: 'pip install --target ~/rez .'
+        # windows
+        - os: windows-2019
+          method: install
+          REZ_SET_PATH_COMMAND: '$env:PATH="$env:PATH;C:\ProgramData\rez\Scripts\rez"'
+          REZ_INSTALL_COMMAND: 'python ./install.py C:\ProgramData\rez'
+        - os: windows-2019
+          method: pip
+          REZ_SET_PATH_COMMAND: '[System.Environment]::SetEnvironmentVariable("PATH","$env:PATH;C:\ProgramData\rez\bin"); $env:PYTHONPATH="$env:PYTHONPATH;C:\ProgramData\rez"'
+          REZ_INSTALL_COMMAND: 'pip install --target C:\ProgramData\rez .'
+
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2
@@ -33,27 +67,14 @@ jobs:
 
     - name: Install
       run: |
-        ${{ matrix.method }}
-        find /opt/rez/ -maxdepth 2
-
-    - name: rez status
-      run: |
-        export ${{ matrix.exports }}
-        rez status
+        ${{ matrix.REZ_INSTALL_COMMAND }}
 
-    - name: rez-pip --install .
+    - name: Run rez-status
       run: |
-        export ${{ matrix.exports }}
-        rez-pip --install .
-        rez view rez
+        ${{ matrix.REZ_SET_PATH_COMMAND }}
+        rez-status
 
-    - name: Import rez package in Python
+    - name: Install rez with rez-pip
       run: |
-        export ${{ matrix.exports }}
-
-        # Still needed as there's no fallback to use system's python
-        # TODO update once 'provides' mechanism is implemented
-        rez bind python
-
-        echo "Checking rez as python package:"
-        rez env rez -- python -c 'import rez;print(rez.__file__)'
+        ${{ matrix.REZ_SET_PATH_COMMAND }}
+        rez-pip --install .

install.py

@@ -85,9 +85,15 @@ def patch_rez_binaries(dest_dir):
 
     # delete rez bin files written into virtualenv
     for name in specs.keys():
-        filepath = os.path.join(virtualenv_bin_path, name)
-        if os.path.isfile(filepath):
-            os.remove(filepath)
+        basepath = os.path.join(virtualenv_bin_path, name)
+        filepaths = [
+            basepath,
+            basepath + "-script.py",
+            basepath + ".exe"
+        ]
+        for filepath in filepaths:
+            if os.path.isfile(filepath):
+                os.remove(filepath)
 
     # write patched bins instead. These go into 'bin/rez' subdirectory, which
     # gives us a bin dir containing only rez binaries. This is what we want -