Add deployment example

example/DEPLOYMENT.md

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+# Deploy `tljh_repo2docker` as a hub-managed service
+
+A guide to help you add `tljh_repo2docker` service to a JupyterHub deployment from scratch.
+
+> [!NOTE]
+> In this guide, we assume you have experience with setting up JupyterHub on Kubernetes. We will use [Zero to JupyterHub](https://z2jh.jupyter.org/en/latest/index.html#zero-to-jupyterhub-with-kubernetes) as the base JupyterHub deployment. 
+
+## Create a new JupyterHub docker image.
+
+Since we are going to use `tljh_repo2docker` as a hub-managed service, the python package needs to be installed into the base JupyterHub image. We will build a custom image based on the [zero-to-jupyterhub image](https://quay.io/repository/jupyterhub/k8s-hub). Here is a minimal docker file to build the custom image:
+
+```docker
+FROM quay.io/jupyterhub/k8s-hub:3.3.7
+
+USER root
+RUN python3 -m pip install "tljh-repo2docker>=2.0.0a1"
+
+USER jovyan
+```
+
+Then you can build and push the image to the registry of your choice:
+
+```bash
+docker build . -t k8s-hub-tljh:xxx
+```
+## Installing JupyterHub and tljh_repo2docker with Helm chart.
+
+With a Kubernetes cluster available and Helm installed, we can install our custom JupyterHub image in the Kubernetes cluster using the JupyterHub Helm chart. You can find a chart template at [example/tljh_r2d](example/tljh_r2d). 
+
+### Using local build-backend via `repo2docker`.
+
+To build images using the local docker engine, modify the `value.yaml` file with the following content:
+
+```yaml
+# values.yaml
+jupyterhub:
+  enabled: true
+  hub:
+    image:
+      name: k8s-hub-tljh
+      tag: xxx
+    extraFiles:
+      my_jupyterhub_config:
+        mountPath: /usr/local/etc/jupyterhub/jupyterhub_config.d/jupyterhub_config.py
+```
+
+Now install the chart with the JupyterHub config from `jupyterhub_config_local.py`:
+
+```bash
+helm upgrade --install tljh . --wait --set-file jupyterhub.hub.extraFiles.my_jupyterhub_config.stringData=./jupyterhub_config_local.py
+```
+
+### Using binderhub service as build-backend.
+
+To use binderhub as the build-backend, you need to deploy [binderhub service](https://binderhub-service.readthedocs.io/en/latest/tutorials/install.html) and config `tljh-repo2docker` to use this service. Here is an example of the configuration: 
+
+```yaml
+#values.yaml
+
+jupyterhub:
+  enabled: true
+  hub:
+    image:
+      name: k8s-hub-binhderhub-tljh
+      tag: xxx
+    config:
+      BinderSpawner:
+        auth_enabled: true
+    extraFiles:
+      my_jupyterhub_config:
+        mountPath: /usr/local/etc/jupyterhub/jupyterhub_config.d/jupyterhub_config.py
+
+binderhub-service:
+  config:
+    BinderHub:
+      base_url: /services/binder
+      use_registry: true
+      image_prefix: ""
+      enable_api_only_mode: true
+
+  buildPodsRegistryCredentials:
+    server: "https://index.docker.io/v1/" # Set image registry for pushing images
+
+```
+
+Now install the chart with the JupyterHub config from `jupyterhub_config_binderhub.py` and with image registry credentials passed via command line:
+
+```bash
+helm upgrade --install tljh . --wait --set-file jupyterhub.hub.extraFiles.my_jupyterhub_config.stringData=./jupyterhub_config_binderhub.py --set binderhub-service.buildPodsRegistryCredentials.password=xxx --set binderhub-service.buildPodsRegistryCredentials.username=xxx
+```
+
+Now you should have a working instance of JupyterHub with `tljh_repo2docker` service deployed.

example/Dockerfile

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+FROM quay.io/jupyterhub/k8s-hub:3.3.7
+
+USER root
+RUN python3 -m pip install "tljh-repo2docker>=2.0.0a1"
+
+USER jovyan

example/tljh_r2d/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

example/tljh_r2d/Chart.lock

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+dependencies:
+- name: jupyterhub
+  repository: https://hub.jupyter.org/helm-chart/
+  version: 3.3.7
+- name: binderhub-service
+  repository: https://2i2c.org/binderhub-service
+  version: 0.1.0-0.dev.git.201.h161a088
+digest: sha256:db05fc18bdb7cbcf06ea8881ed72391383ed0524def10d76b62b9d1880abac51
+generated: "2024-05-02T20:34:11.347162518+02:00"

example/tljh_r2d/Chart.yaml

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+apiVersion: v2
+name: tljh_r2d
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"
+
+dependencies:
+  - name: jupyterhub
+    version: "3.3.7"
+    repository: https://hub.jupyter.org/helm-chart/
+    condition: jupyterhub.enabled
+  # Optional binderhub build backend
+  - name: binderhub-service
+    version : "0.1.0-0.dev.git.201.h161a088"
+    repository: https://2i2c.org/binderhub-service

example/tljh_r2d/jupyterhub_config_binderhub.py

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+"""
+This file is only used for local development
+and overrides some of the default values from the plugin.
+"""
+
+from kubespawner import KubeSpawner
+from pathlib import Path
+from tljh_repo2docker import TLJH_R2D_ADMIN_SCOPE
+from tornado import web
+from traitlets import Bool, Unicode
+from traitlets.config import Configurable
+import sys
+
+
+"""
+Helpers for creating BinderSpawners
+This file is defined in binderhub/binderspawner_mixin.py and is copied to here
+"""
+
+
+class BinderSpawnerMixin(Configurable):
+    """
+    Mixin to convert a JupyterHub container spawner to a BinderHub spawner
+
+    Container spawner must support the following properties that will be set
+    via spawn options:
+    - image: Container image to launch
+    - token: JupyterHub API token
+    """
+
+    def __init__(self, *args, **kwargs):
+        # Is this right? Is it possible to having multiple inheritance with both
+        # classes using traitlets?
+        # https://stackoverflow.com/questions/9575409/calling-parent-class-init-with-multiple-inheritance-whats-the-right-way
+        # https://github.com/ipython/traitlets/pull/175
+        super().__init__(*args, **kwargs)
+
+    auth_enabled = Bool(
+        False,
+        help="""
+        Enable authenticated binderhub setup.
+
+        Requires `jupyterhub-singleuser` to be available inside the repositories
+        being built.
+        """,
+        config=True,
+    )
+
+    cors_allow_origin = Unicode(
+        "",
+        help="""
+        Origins that can access the spawned notebooks.
+
+        Sets the Access-Control-Allow-Origin header in the spawned
+        notebooks. Set to '*' to allow any origin to access spawned
+        notebook servers.
+
+        See also BinderHub.cors_allow_origin in binderhub config
+        for controlling CORS policy for the BinderHub API endpoint.
+        """,
+        config=True,
+    )
+
+    def get_args(self):
+        if self.auth_enabled:
+            args = super().get_args()
+        else:
+            args = [
+                "--ip=0.0.0.0",
+                f"--port={self.port}",
+                f"--NotebookApp.base_url={self.server.base_url}",
+                f"--NotebookApp.token={self.user_options['token']}",
+                "--NotebookApp.trust_xheaders=True",
+            ]
+            if self.default_url:
+                args.append(f"--NotebookApp.default_url={self.default_url}")
+
+            if self.cors_allow_origin:
+                args.append("--NotebookApp.allow_origin=" + self.cors_allow_origin)
+            # allow_origin=* doesn't properly allow cross-origin requests to single files
+            # see https://github.com/jupyter/notebook/pull/5898
+            if self.cors_allow_origin == "*":
+                args.append("--NotebookApp.allow_origin_pat=.*")
+            args += self.args
+            # ServerApp compatibility: duplicate NotebookApp args
+            for arg in list(args):
+                if arg.startswith("--NotebookApp."):
+                    args.append(arg.replace("--NotebookApp.", "--ServerApp."))
+        return args
+
+    def start(self):
+        if not self.auth_enabled:
+            if "token" not in self.user_options:
+                raise web.HTTPError(400, "token required")
+            if "image" not in self.user_options:
+                raise web.HTTPError(400, "image required")
+        if "image" in self.user_options:
+            self.image = self.user_options["image"]
+        return super().start()
+
+    def get_env(self):
+        env = super().get_env()
+        if "repo_url" in self.user_options:
+            env["BINDER_REPO_URL"] = self.user_options["repo_url"]
+        for key in (
+            "binder_ref_url",
+            "binder_launch_host",
+            "binder_persistent_request",
+            "binder_request",
+        ):
+            if key in self.user_options:
+                env[key.upper()] = self.user_options[key]
+        return env
+
+
+class BinderSpawner(BinderSpawnerMixin, KubeSpawner):
+    pass
+
+
+HERE = Path(__file__).parent
+
+c.JupyterHub.spawner_class = BinderSpawner
+
+c.JupyterHub.allow_named_servers = True
+
+c.JupyterHub.services.extend(
+    [
+        {"name": "binder", "url": "http://tljh-binderhub-service"},
+        {
+            "name": "tljhrepo2docker",
+            "url": "http://r2d-svc:6789",
+            "command": [
+                sys.executable,
+                "-m",
+                "tljh_repo2docker",
+                "--ip",
+                "0.0.0.0",
+                "--port",
+                "6789",
+                "--TljhRepo2Docker.binderhub_url",
+                "http://tljh-binderhub-service/services/binder",
+            ],
+            "oauth_no_confirm": True,
+            "oauth_client_allowed_scopes": [
+                TLJH_R2D_ADMIN_SCOPE,
+            ],
+        },
+    ]
+)
+
+c.JupyterHub.custom_scopes = {
+    TLJH_R2D_ADMIN_SCOPE: {
+        "description": "Admin access to myservice",
+    },
+}
+
+c.JupyterHub.load_roles = [
+    {
+        "description": "Role for tljh_repo2docker service",
+        "name": "tljh-repo2docker-service",
+        "scopes": [
+            "read:users",
+            "read:roles:users",
+            "admin:servers",
+            "access:services!service=binder",
+        ],
+        "services": ["tljhrepo2docker"],
+    },
+    {
+        "name": "tljh-repo2docker-service-admin",
+        "users": [],  # List of users having admin right on tljh-repo2docker
+        "scopes": [TLJH_R2D_ADMIN_SCOPE],
+    },
+    {
+        "name": "user",
+        "scopes": [
+            "self",
+            # access to the env page
+            "access:services!service=tljhrepo2docker",
+        ],
+    },
+]