feat(nodeenv): write the posix activate on Windows for git-bash

On Windows only activate.bat, deactivate.bat and Activate.ps1 were
written, so git-bash and the other posix shells there had nothing to
source. Python's venv treats its bash activate as "common" and installs
it on every platform; do the same.

The script itself needs two Windows adjustments: node.exe keeps the
global modules next to itself, in Scripts/node_modules rather than
lib/node_modules, and it cannot read the /c/... paths a Windows shell
hands out, so NODE_PATH and NPM_CONFIG_PREFIX are converted back with
cygpath while $PATH stays posix.

A new CI job runs the activation under `shell: bash` on a windows
runner, which is git-bash.

#226

Author: ekalinin

.github/workflows/tests.yml

@@ -89,6 +89,33 @@ jobs:
         run: |
           pytest -m integration tests/ -v
 
+  # The posix activate written on Windows is only useful in a shell that
+  # can source it, and `shell: bash` on a windows runner is git-bash -
+  # exactly the environment of issue #226.
+  git-bash:
+    runs-on: windows-latest
+    timeout-minutes: 10
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.14'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run git-bash activation test
+        run: |
+          pytest -m integration -k git_bash tests/ -v
+
   coverage:
     runs-on: ubuntu-latest
     steps:

CHANGES

@@ -32,6 +32,9 @@ Version [unreleased]
 - Documented that `--mirror` takes a `file://` URL, so a local directory can
   serve as the download source
   `#193 <https://github.com/ekalinin/nodeenv/issues/193>`_
+- The posix `activate` is now written on Windows too, into "Scripts", so
+  git-bash and the other posix shells there can activate an environment
+  `#226 <https://github.com/ekalinin/nodeenv/issues/226>`_
 
 Version 1.3.1
 -------------

README.rst

@@ -99,6 +99,12 @@ Activate new environment::
 
     $ . env/bin/activate
 
+On Windows the environment is created in ``env\Scripts`` instead, with a
+script per shell: ``activate.bat`` for cmd, ``Activate.ps1`` for
+PowerShell and ``activate`` for posix shells such as git-bash::
+
+    $ . env/Scripts/activate
+
 Check versions of main packages::
 
     (env) $ node -v

nodeenv.py

@@ -1191,7 +1191,11 @@ def install_activate(env_dir, args):
     Install virtual environment activation script
     """
     if is_WIN:
+        # `activate` is written on Windows too, for git-bash and the other
+        # posix shells available there
+        # https://github.com/ekalinin/nodeenv/issues/226
         files = {
+            'activate': ACTIVATE_SH,
             'activate.bat': ACTIVATE_BAT,
             "deactivate.bat": DEACTIVATE_BAT,
             "Activate.ps1": ACTIVATE_PS1
@@ -1214,7 +1218,9 @@ def install_activate(env_dir, args):
     if args.node == "system":
         files["node"] = SHIM
 
-    mod_dir = join('lib', 'node_modules')
+    # npm keeps the global modules next to node.exe on Windows,
+    # under lib/ everywhere else
+    mod_dir = 'Scripts/node_modules' if is_WIN else join('lib', 'node_modules')
     prompt = args.prompt or '(%s)' % os.path.basename(os.path.abspath(env_dir))
 
     if args.node == "system":
@@ -1238,6 +1244,10 @@ def install_activate(env_dir, args):
                 ['cygpath', '-w', os.path.abspath(bin_dir)],
                 show_stdout=False, in_shell=False)
             content = content.replace('__NPM_CONFIG_PREFIX__', cyg_bin_dir[0])
+        elif is_WIN:
+            # npm's prefix on Windows is the directory holding node.exe
+            content = content.replace('__NPM_CONFIG_PREFIX__',
+                                      '$NODE_VIRTUAL_ENV/Scripts')
         else:
             content = content.replace('__NPM_CONFIG_PREFIX__',
                                       '$NODE_VIRTUAL_ENV')
@@ -1796,7 +1806,7 @@ def main():
 
 # Detect calling this file as a script
 case $0 in
-    */bin/activate )
+    */bin/activate | */Scripts/activate )
         echo "Do not call $0 directly.  Instead source it with \`source $0\`."
         exit 1
         ;;
@@ -1825,7 +1835,7 @@ def main():
 export NODE_VIRTUAL_ENV
 
 _OLD_NODE_VIRTUAL_PATH="$PATH"
-PATH="$NODE_VIRTUAL_ENV/lib/node_modules/.bin:$NODE_VIRTUAL_ENV/__BIN_NAME__:$PATH"
+PATH="$NODE_VIRTUAL_ENV/__MOD_NAME__/.bin:$NODE_VIRTUAL_ENV/__BIN_NAME__:$PATH"
 export PATH
 
 _OLD_NODE_PATH="${NODE_PATH:-}"
@@ -1840,6 +1850,17 @@ def main():
 export npm_config_prefix
 __NPM_ISOLATE__
 
+# Windows shells (git-bash, MSYS, Cygwin) run a native node.exe, which
+# cannot read the posix paths built above: hand it the native ones.
+# $PATH stays posix, that one is read by the shell itself.
+case "$(uname -s 2>/dev/null)" in
+    CYGWIN*|MSYS*|MINGW*)
+        NODE_PATH="$(cygpath -w "$NODE_PATH")"
+        NPM_CONFIG_PREFIX="$(cygpath -w "$NPM_CONFIG_PREFIX")"
+        npm_config_prefix="$NPM_CONFIG_PREFIX"
+        ;;
+esac
+
 if [ -z "${NODE_VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then
     _OLD_NODE_VIRTUAL_PS1="${PS1:-}"
     if [ "x__NODE_VIRTUAL_PROMPT__" != x ] ; then

tests/nodeenv_test.py

@@ -72,8 +72,8 @@ def test_smoke(tmpdir):
     ])
     assert os.path.exists(nenv_path)
     if sys.platform == 'win32':
-        # on Windows nodeenv installs into Scripts/ and provides
-        # activate.bat/Activate.ps1, there is no posix activate script
+        # on Windows nodeenv installs into Scripts/, the posix activate
+        # written there is covered by test_smoke_git_bash
         subprocess.check_call([
             os.path.join(nenv_path, 'Scripts', 'node.exe'), '--version',
         ])
@@ -90,6 +90,40 @@ def test_smoke(tmpdir):
             assert version, '%s --version printed nothing' % command
 
 
+@pytest.mark.integration
+@pytest.mark.skipif(
+    sys.platform != 'win32', reason='git-bash only exists on Windows')
+def test_smoke_git_bash(tmpdir):
+    """
+    The posix activate written on Windows has to work from git-bash.
+    https://github.com/ekalinin/nodeenv/issues/226
+    """
+    nenv_path = tmpdir.join('nenv').strpath
+    subprocess.check_call([
+        'coverage', 'run', '-p',
+        '-m', 'nodeenv', '--prebuilt', nenv_path,
+    ])
+
+    # node.exe and npm report native paths, so both answers can be
+    # compared with the environment directory as python knows it
+    script = (
+        'set -e\n'
+        'env_dir="$(cygpath "$1")"\n'
+        '. "$env_dir/Scripts/activate"\n'
+        'node -p "process.execPath"\n'
+        'npm root -g\n'
+    )
+    out = subprocess.check_output(['bash', '-c', script, 'bash', nenv_path])
+    node_exe, npm_root = out.decode('utf-8').splitlines()
+
+    assert _inside(node_exe, nenv_path), \
+        'node resolved to %s, outside %s' % (node_exe, nenv_path)
+    # npm would answer with a path outside the environment if activate
+    # had left it a posix prefix it cannot read
+    assert _inside(npm_root, nenv_path), \
+        'npm root -g is %s, outside %s' % (npm_root, nenv_path)
+
+
 @pytest.mark.integration
 @pytest.mark.skipif(sys.platform == 'win32', reason='-n system is posix only')
 def test_smoke_n_system_special_chars(tmpdir):

tests/test_install_activate.py

@@ -412,6 +412,114 @@ def test_isolate_npm_shim_content(tmpdir):
     assert content.index('npm_config_cache') < content.index('exec ')
 
 
+# Windows also gets the posix `activate`, for git-bash and friends.
+# https://github.com/ekalinin/nodeenv/issues/226
+#
+# These run on every platform: is_WIN is faked so the Scripts/ layout can
+# be checked without a Windows host.
+
+
+@pytest.fixture
+def fake_win():
+    """
+    Pretend the host is Windows.  install_activate() links nodejs.exe with
+    mklink there, which exists on Windows only, so callit() is stubbed too.
+    """
+    with mock.patch.object(nodeenv, 'is_WIN', True):
+        with mock.patch.object(nodeenv, 'callit'):
+            yield
+
+
+def _install_win(tmpdir, *extra_args):
+    bin_dir = tmpdir.join('Scripts')
+    if not bin_dir.check():
+        bin_dir.mkdir()
+
+    argv = ['nodeenv'] + list(extra_args) + [str(tmpdir)]
+    with mock.patch.object(sys, 'argv', argv):
+        opts = nodeenv.parse_args()
+        nodeenv.install_activate(str(tmpdir), opts)
+    return bin_dir
+
+
+def test_win_writes_posix_activate(tmpdir, fake_win):
+    bin_dir = _install_win(tmpdir)
+
+    assert sorted(p.basename for p in bin_dir.listdir()) == [
+        'Activate.ps1', 'activate', 'activate.bat', 'deactivate.bat']
+
+
+def test_win_activate_puts_scripts_on_path(tmpdir, fake_win):
+    content = _install_win(tmpdir).join('activate').read()
+
+    assert ('PATH="$NODE_VIRTUAL_ENV/Scripts/node_modules/.bin:'
+            '$NODE_VIRTUAL_ENV/Scripts:$PATH"') in content
+
+
+def test_win_activate_points_node_at_scripts(tmpdir, fake_win):
+    # npm keeps the global modules next to node.exe on Windows, there is
+    # no lib/node_modules there
+    content = _install_win(tmpdir).join('activate').read()
+
+    assert 'NODE_PATH="$NODE_VIRTUAL_ENV/Scripts/node_modules"' in content
+    assert 'NPM_CONFIG_PREFIX="$NODE_VIRTUAL_ENV/Scripts"' in content
+    assert 'npm_config_prefix="$NODE_VIRTUAL_ENV/Scripts"' in content
+
+
+def test_win_activate_has_no_placeholders_left(tmpdir, fake_win):
+    content = _install_win(tmpdir).join('activate').read()
+
+    for placeholder in ('__NODE_VIRTUAL_PROMPT__', '__NODE_VIRTUAL_ENV__',
+                        '__SHIM_NODE__', '__BIN_NAME__', '__MOD_NAME__',
+                        '__NPM_ISOLATE__', '__NPM_UNISOLATE__',
+                        '__NPM_CONFIG_PREFIX__'):
+        assert placeholder not in content
+
+
+def test_win_activate_converts_paths_for_node_exe(tmpdir, fake_win):
+    # node.exe is a native binary: it cannot read the /c/... paths a
+    # Windows shell hands out, so the script converts them back
+    content = _install_win(tmpdir).join('activate').read()
+
+    assert 'CYGWIN*|MSYS*|MINGW*)' in content
+    assert 'NODE_PATH="$(cygpath -w "$NODE_PATH")"' in content
+    assert 'NPM_CONFIG_PREFIX="$(cygpath -w "$NPM_CONFIG_PREFIX")"' in content
+    # the conversion must come after the variables are built
+    assert content.index('NODE_PATH="$NODE_VIRTUAL_ENV') < \
+        content.index('cygpath -w')
+
+
+def test_win_activate_is_valid_sh(tmpdir, fake_win):
+    activate = _install_win(tmpdir).join('activate')
+
+    subprocess.check_call(['sh', '-n', str(activate)])
+
+
+def test_win_activate_refuses_to_be_run_directly(tmpdir, fake_win):
+    activate = str(_install_win(tmpdir).join('activate'))
+
+    proc = subprocess.Popen(
+        ['sh', activate], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    out, _ = proc.communicate()
+
+    assert proc.returncode == 1
+    assert b'Do not call' in out
+
+
+def test_win_python_virtualenv_appends_to_activate(tmpdir, fake_win):
+    # nodeenv -p inside a python venv: venv wrote Scripts/activate for
+    # git-bash already, nodeenv has to extend it, not replace it
+    bin_dir = tmpdir.join('Scripts')
+    bin_dir.mkdir()
+    bin_dir.join('activate').write('# python venv activate\n')
+
+    _install_win(tmpdir, '-p')
+
+    content = bin_dir.join('activate').read()
+    assert content.startswith('# python venv activate\n')
+    assert 'NODE_VIRTUAL_ENV_DISABLE_PROMPT=1' in content
+
+
 @pytest.mark.skipif(nodeenv.is_WIN, reason='system node is POSIX only')
 def test_isolate_npm_node_system_shim_exports(tmpdir):
     bin_dir = tmpdir.join('bin')