Install multiple versions of same extension

jupyterlab/commands.py

@@ -39,6 +39,9 @@
 DEV_DIR = osp.abspath(os.path.join(HERE, '..', 'dev_mode'))
 
 
+# If we are pinning the package, rename it `pin@<alias>`
+PIN_PREFIX = 'pin@'
+
 class ProgressProcess(Process):
 
     def __init__(self, cmd, logger=None, cwd=None, kill_event=None,
@@ -304,7 +307,8 @@ def watch(app_dir=None, logger=None, core_config=None):
     return handler.watch()
 
 
-def install_extension(extension, app_dir=None, logger=None, core_config=None):
+
+def install_extension(extension, app_dir=None, logger=None, core_config=None, pin=None):
     """Install an extension package into JupyterLab.
 
     The extension is first validated.
@@ -314,7 +318,7 @@ def install_extension(extension, app_dir=None, logger=None, core_config=None):
     logger = _ensure_logger(logger)
     _node_check(logger)
     handler = _AppHandler(app_dir, logger, core_config=core_config)
-    return handler.install_extension(extension)
+    return handler.install_extension(extension, pin=pin)
 
 
 def uninstall_extension(name=None, app_dir=None, logger=None, all_=False, core_config=None):
@@ -491,7 +495,7 @@ def __init__(self, app_dir, logger=None, kill_event=None, core_config=None):
         # TODO: Make this configurable
         self.registry = 'https://registry.npmjs.org'
 
-    def install_extension(self, extension, existing=None):
+    def install_extension(self, extension, existing=None, pin=None):
         """Install an extension package into JupyterLab.
 
         The extension is first validated.
@@ -518,7 +522,7 @@ def install_extension(self, extension, existing=None):
 
         # Install the package using a temporary directory.
         with TemporaryDirectory() as tempdir:
-            info = self._install_extension(extension, tempdir)
+            info = self._install_extension(extension, tempdir, pin=pin)
 
         name = info['name']
 
@@ -787,14 +791,18 @@ def _update_extension(self, name):
 
         Returns `True` if a rebuild is recommended, `False` otherwise.
         """
+        data = self.info['extensions'][name]
+        if data["alias_package_source"]:
+            self.logger.warn("Skipping updating pinned extension '%s'." % name)
+            return False
         try:
             latest = self._latest_compatible_package_version(name)
         except URLError:
             return False
         if latest is None:
             self.logger.warn('No compatible version found for %s!' % (name,))
             return False
-        if latest == self.info['extensions'][name]['version']:
+        if latest == data['version']:
             self.logger.info('Extension %r already up to date' % name)
             return False
         self.logger.info('Updating %s to version %s' % (name, latest))
@@ -1212,17 +1220,25 @@ def _get_extensions_in_dir(self, dname, core_data):
             name = data['name']
             jlab = data.get('jupyterlab', dict())
             path = osp.abspath(target)
+
+            filename = osp.basename(target)
+            if filename.startswith(PIN_PREFIX):
+                alias = filename[len(PIN_PREFIX):-len(".tgz")]
+            else:
+                alias = None
             # homepage, repository  are optional
             if 'homepage' in data:
                 url = data['homepage']
             elif 'repository' in data and isinstance(data['repository'], dict):
                 url = data['repository'].get('url', '')
             else:
                 url = ''
-            extensions[name] = dict(path=path,
+            extensions[alias or name] = dict(path=path,
                                     filename=osp.basename(path),
                                     url=url,
                                     version=data['version'],
+                                    # Only save the package name if the extension name is an alias
+                                    alias_package_source=name if alias else None,
                                     jupyterlab=jlab,
                                     dependencies=deps,
                                     tar_dir=osp.dirname(path),
@@ -1316,7 +1332,12 @@ def _list_extensions(self, info, ext_type):
                 extra += ' %s' % GREEN_OK
             if data['is_local']:
                 extra += '*'
-            logger.info('        %s v%s%s' % (name, version, extra))
+            # If we have the package name in the data, this means this extension's name is the alias name
+            alias_package_source = data['alias_package_source']
+            if alias_package_source:
+                logger.info('        %s %s v%s%s' % (name, alias_package_source, version, extra))
+            else:
+                logger.info('        %s v%s%s' % (name, version, extra))
             if errors:
                 error_accumulator[name] = (version, errors)
 
@@ -1381,10 +1402,10 @@ def _get_local_data(self, source):
 
         return data
 
-    def _install_extension(self, extension, tempdir):
+    def _install_extension(self, extension, tempdir, pin=None):
         """Install an extension with validation and return the name and path.
         """
-        info = self._extract_package(extension, tempdir)
+        info = self._extract_package(extension, tempdir, pin=pin)
         data = info['data']
 
         # Verify that the package is an extension.
@@ -1438,7 +1459,7 @@ def _install_extension(self, extension, tempdir):
         info['path'] = target
         return info
 
-    def _extract_package(self, source, tempdir):
+    def _extract_package(self, source, tempdir, pin=None):
         """Call `npm pack` for an extension.
 
         The pack command will download the package tar if `source` is
@@ -1465,6 +1486,11 @@ def _extract_package(self, source, tempdir):
             info['path'] = target
         else:
             info['path'] = path
+        if pin:
+            old_path = info['path']
+            new_path = pjoin(osp.dirname(old_path), '{}{}.tgz'.format(PIN_PREFIX, pin))
+            shutil.move(old_path, new_path)
+            info['path'] = new_path
 
         info['filename'] = osp.basename(info['path'])
         info['name'] = info['data']['name']

jupyterlab/labextensions.py

@@ -57,6 +57,8 @@
 aliases['minimize'] = 'BaseExtensionApp.minimize'
 aliases['debug-log-path'] = 'DebugLogFileMixin.debug_log_path'
 
+install_aliases = copy(aliases)
+install_aliases['pin-version-as'] = 'InstallLabExtensionApp.pin'
 
 VERSION = get_app_version()
 
@@ -111,15 +113,38 @@ def _log_format_default(self):
 
 
 class InstallLabExtensionApp(BaseExtensionApp):
-    description = "Install labextension(s)"
+    description = """Install labextension(s)
+
+     Usage
+
+        jupyter labextension install [--pin-version-as <alias,...>] <package...>
+
+    This installs JupyterLab extensions similar to yarn add or npm install.
+
+    Pass a list of comma seperate names to the --pin-version-as flag
+    to use as alises for the packages providers. This is useful to
+    install multiple versions of the same extension.
+    These can be uninstalled with the alias you provided
+    to the flag, similar to the "alias" feature of yarn add.
+    """
+    aliases = install_aliases
+
+    pin = Unicode('', config=True,
+        help="Pin this version with a certain alias")
 
     def run_task(self):
+        pinned_versions = self.pin.split(',')
         self.extra_args = self.extra_args or [os.getcwd()]
         return any([
             install_extension(
-                arg, self.app_dir, logger=self.log,
-                core_config=self.core_config)
-            for arg in self.extra_args
+                arg,
+                self.app_dir,
+                logger=self.log,
+                core_config=self.core_config,
+                # Pass in pinned alias if we have it
+                pin=pinned_versions[i] if i < len(pinned_versions) else None
+            )
+            for i, arg in enumerate(self.extra_args)
         ])
 
 

jupyterlab/tests/test_jupyterlab.py

@@ -9,6 +9,10 @@
 import os
 import shutil
 import sys
+import subprocess
+import shutil
+import pathlib
+import platform
 from os.path import join as pjoin
 from tempfile import TemporaryDirectory
 from unittest import TestCase
@@ -121,12 +125,15 @@ def ignore(dname, files):
         self.assertEqual(paths.ENV_CONFIG_PATH, [self.config_dir])
         self.assertEqual(paths.ENV_JUPYTER_PATH, [self.data_dir])
         self.assertEqual(
-            commands.get_app_dir(),
+            os.path.realpath(commands.get_app_dir()),
             os.path.realpath(pjoin(self.data_dir, 'lab'))
         )
 
         self.app_dir = commands.get_app_dir()
 
+        # Set pinned extension names
+        self.pinned_packages = ['jupyterlab-test-extension@1.0', 'jupyterlab-test-extension@2.0']
+
     def test_install_extension(self):
         assert install_extension(self.mock_extension) is True
         path = pjoin(self.app_dir, 'extensions', '*.tgz')
@@ -228,6 +235,58 @@ def test_uninstall_core_extension(self):
         assert '@jupyterlab/console-extension' in extensions
         assert check_extension('@jupyterlab/console-extension')
 
+    def test_install_and_uninstall_pinned(self):
+        """
+        You should be able to install different versions of the same extension with different
+        pinned names and uninstall them with those names.
+        """
+        NAMES = ['test-1', 'test-2']
+        assert install_extension(self.pinned_packages[0], pin=NAMES[0])
+        assert install_extension(self.pinned_packages[1], pin=NAMES[1])
+
+        extensions = get_app_info(self.app_dir)['extensions']
+        assert NAMES[0] in extensions
+        assert NAMES[1] in extensions
+        assert check_extension(NAMES[0])
+        assert check_extension(NAMES[1])
+
+        # Uninstall
+        assert uninstall_extension(NAMES[0])
+        assert uninstall_extension(NAMES[1])
+
+        extensions = get_app_info(self.app_dir)['extensions']
+        assert NAMES[0] not in extensions
+        assert NAMES[1] not in extensions
+        assert not check_extension(NAMES[0])
+        assert not check_extension(NAMES[1])
+
+    @pytest.mark.skipif(platform.system() == 'Windows', reason='running npm pack fails on windows CI')
+    def test_install_and_uninstall_pinned_folder(self):
+        """
+        Same as above test, but installs from a local folder instead of from npm.
+        """
+        # Download each version of the package from NPM:
+        base_dir = pathlib.Path(self.tempdir())
+
+        # The archive file names are printed to stdout when run `npm pack`
+        packages = [
+            subprocess.run(
+                ['npm', 'pack', name],
+                stdout=subprocess.PIPE,
+                universal_newlines=True,
+                check=True,
+                cwd=base_dir
+            ).stdout.strip()
+            for name in self.pinned_packages
+        ]
+
+        shutil.unpack_archive(str(base_dir / packages[0]), str(base_dir / '1'))
+        shutil.unpack_archive(str(base_dir / packages[1]), str(base_dir / '2'))
+        # Change pinned packages to be these directories now, so we install from these folders
+        self.pinned_packages = [str(base_dir / '1' / 'package'), str(base_dir / '2' / 'package')]
+        self.test_install_and_uninstall_pinned()
+
+
     def test_link_extension(self):
         path = self.mock_extension
         name = self.pkg_names['extension']

scripts/travis_script.sh

@@ -142,7 +142,6 @@ if [[ $GROUP == usage ]]; then
     jupyter lab workspaces export newspace > newspace.json
     rm workspace.json newspace.json
 
-
     # Make sure we can call help on all the cli apps.
     jupyter lab -h
     jupyter lab build -h