Add container example

hartikainen · hartikainen · commit a84700445303 · 2025-07-04T18:22:44.000-04:00
diff --git a/examples/bzlmod/container/.bazelrc b/examples/bzlmod/container/.bazelrc
@@ -0,0 +1,26 @@
+common --@rules_python//python/config_settings:bootstrap_impl=script
+common --@rules_python//python/config_settings:venvs_site_packages=no
+# See https://github.com/bazel-contrib/rules_python/issues/2864#issuecomment-2859325467
+common --@rules_python//python/config_settings:venvs_use_declare_symlink=yes
+
+
+# With container
+# | vens_site_packages | venvs_use_declare_symlink | result  |
+# |--------------------|-----------------------------|---------|
+# | yes                | no                          | failure |
+# | no                 | no                          | success |
+# | no                 | yes                         | failure |
+# | yes                | yes                         | failure |
+# | -----------------------------------------------------------|
+# | all commented out                                | success |
+
+
+# Without container
+# | vens_site_packages | venvs_use_declare_symlink | result  |
+# |--------------------|-----------------------------|---------|
+# | yes                | no                          | failure |
+# | no                 | no                          | success |
+# | no                 | yes                         | success |
+# | yes                | yes                         | failure |
+# | -----------------------------------------------------------|
+# | all commented out                                | success |
diff --git a/examples/bzlmod/container/.bazelversion b/examples/bzlmod/container/.bazelversion
@@ -0,0 +1 @@
+8.2.1
diff --git a/examples/bzlmod/container/BUILD.bazel b/examples/bzlmod/container/BUILD.bazel
@@ -0,0 +1,37 @@
+load("@aspect_rules_py//py:defs.bzl", "py_image_layer")
+load("@rules_oci//oci:defs.bzl", "oci_image", "oci_load")
+load("@rules_python//python:defs.bzl", "py_binary")
+
+licenses(["notice"])
+
+py_binary(
+    name = "server",
+    srcs = ["server.py"],
+    deps = [
+        "@pypi//absl_py",
+        "@pypi//flask",
+    ],
+)
+
+oci_image(
+    name = "server_image",
+    base = "@docker_io_python",
+    entrypoint = ["/app/server"],
+    tars = py_image_layer(
+        name = "server_layer",
+        binary = ":server",
+        root = "/app/",
+    ),
+)
+
+oci_load(
+    name = "server_image.load",
+    image = ":server_image",
+    repo_tags = ["server:latest"],
+)
+
+filegroup(
+    name = "server_image.tar",
+    srcs = [":server_image.load"],
+    output_group = "tarball",
+)
diff --git a/examples/bzlmod/container/MODULE.bazel b/examples/bzlmod/container/MODULE.bazel
@@ -0,0 +1,41 @@
+"""Example of python inside container."""
+
+module(
+    name = "container-example",
+    version = "0.0.1",
+)
+
+bazel_dep(name = "rules_python", version = "1.4.1")
+bazel_dep(name = "rules_oci", version = "2.2.6")
+bazel_dep(name = "platforms", version = "0.0.11")
+bazel_dep(name = "aspect_rules_py", version = "1.6.0")
+bazel_dep(name = "rules_pkg", version = "1.1.0")
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    is_default = True,
+    python_version = "3.12",
+)
+python.override(minor_mapping = {"3.12": "3.12.7"})
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "pypi",
+    python_version = "3.12",
+    requirements_lock = "requirements.txt",
+)
+
+use_repo(pip, "pypi")
+
+oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
+oci.pull(
+    name = "docker_io_python",
+    digest = "sha256:034724ef64585eeb0e82385e9aabcbeabfe5f7cae2c2dcedb1da95114372b6d7",
+    image = "docker.io/library/python",
+    platforms = [
+        "linux/amd64",
+        "linux/arm64/v8",
+    ],
+    tag = "3.13-slim",
+)
+use_repo(oci, "docker_io_python", "docker_io_python_linux_amd64", "docker_io_python_linux_arm64_v8")
diff --git a/examples/bzlmod/container/requirements.in b/examples/bzlmod/container/requirements.in
@@ -0,0 +1,3 @@
+absl-py
+flask
+redis
diff --git a/examples/bzlmod/container/requirements.txt b/examples/bzlmod/container/requirements.txt
@@ -0,0 +1,23 @@
+# This file was autogenerated by uv via the following command:
+#    uv pip compile ./requirements.in -o ./requirements.txt
+absl-py==2.3.1
+    # via -r ./requirements.in
+blinker==1.9.0
+    # via flask
+click==8.2.1
+    # via flask
+flask==3.1.1
+    # via -r ./requirements.in
+itsdangerous==2.2.0
+    # via flask
+jinja2==3.1.6
+    # via flask
+markupsafe==3.0.2
+    # via
+    #   flask
+    #   jinja2
+    #   werkzeug
+redis==6.2.0
+    # via -r ./requirements.in
+werkzeug==3.1.3
+    # via flask
diff --git a/examples/bzlmod/container/server.py b/examples/bzlmod/container/server.py
@@ -0,0 +1,39 @@
+"""A HTTP server example."""
+
+from collections.abc import Sequence
+import os
+import signal
+import time
+
+from absl import app
+from absl import flags
+from flask import Flask
+
+server = Flask(__name__)
+
+
+@server.route("/")
+def index() -> str:
+    return f"Hello, World! This is Flask."
+
+
+def main(argv: Sequence[str]) -> None:
+    del argv
+
+    def handler(signum, frame):
+        # Raising an exception is a clean way to break out of server.run()
+        raise SystemExit("Server timed out, shutting down.")
+
+    # Set the alarm signal handler
+    signal.signal(signal.SIGALRM, handler)
+    # Trigger the alarm after 5 seconds
+    signal.alarm(2)
+
+    try:
+        server.run(host="0.0.0.0", port=8080, debug=False)
+    except SystemExit as e:
+        print(e)
+
+
+if __name__ == "__main__":
+    app.run(main)
