feat: add support for trusted-host in pip configuration for non-HTTPS repositories

Signed-off-by: d9pouces <github@19pouces.net>

id_configurator/modules/python.py

@@ -3,6 +3,8 @@ PythonRepository entries instead of pypi.org, and to trust the root
 certificates installed by the certificates module.
 
 - pip: system-wide `/etc/pip.conf` (`index-url`/`extra-index-url`/`cert`).
+  Any repository whose URL isn't HTTPS has its host added to
+  `trusted-host`, since pip otherwise refuses a plain HTTP index.
 - uv: system-wide `/etc/uv/uv.toml` (`[[index]]` entries, `native-tls`).
 - poetry: `/root/.config/pypoetry/config.toml` (`repositories.*`/`certificates.*`).
   Poetry has no global "replace PyPI" switch: a project's `pyproject.toml`
@@ -23,6 +25,7 @@ from __future__ import annotations
 
 import json
 import logging
+from urllib.parse import urlparse
 
 from id_configurator.config import PythonRepository
 from id_configurator.context import Context
@@ -41,11 +44,22 @@ def _toml_string(value: str) -> str:
     return json.dumps(value)
 
 
+def _trusted_host(repository: PythonRepository) -> str | None:
+    parsed = urlparse(repository.index_url)
+    return None if parsed.scheme.lower() == "https" else parsed.hostname
+
+
 def _write_pip_conf(context: Context, repositories: list[PythonRepository]) -> None:
     lines = ["[global]", f"index-url = {repositories[0].index_url}"]
     if len(repositories) > 1:
         lines.append("extra-index-url =")
         lines.extend(f"    {repository.index_url}" for repository in repositories[1:])
+    trusted_hosts = dict.fromkeys(
+        host for repository in repositories if (host := _trusted_host(repository))
+    )
+    if trusted_hosts:
+        lines.append("trusted-host =")
+        lines.extend(f"    {host}" for host in trusted_hosts)
     lines.append(f"cert = {_CA_BUNDLE}")
     context.write_file(_PIP_CONF, ("\n".join(lines) + "\n").encode("utf-8"))
     logger.info("configured pip to use %s", repositories[0].index_url)

tests/test_python.py

@@ -76,6 +76,84 @@ def test_apply_single_repository(tmp_path) -> None:
     assert not (dst / "usr/lib").exists()
 
 
+def test_apply_adds_trusted_host_for_non_https_repository(tmp_path) -> None:
+    data = {
+        "uuid": "12345678-1234-5678-1234-567812345678",
+        "organisation": "InterDiode",
+        "configurations": {
+            "python": {
+                "repositories": [
+                    {"name": "interdiode", "index-url": "http://example.invalid/simple"}
+                ]
+            }
+        },
+    }
+    config = Configuration.model_validate(data)
+    dst = tmp_path / "dst"
+    context = Context(config=config, dst=dst, src=None)
+
+    PythonModule().apply(context)
+
+    pip_conf = (dst / "etc/pip.conf").read_text(encoding="utf-8")
+    assert pip_conf == (
+        "[global]\n"
+        "index-url = http://example.invalid/simple\n"
+        "trusted-host =\n"
+        "    example.invalid\n"
+        "cert = /etc/ssl/certs/ca-certificates.crt\n"
+    )
+
+
+def test_apply_adds_trusted_host_only_for_non_https_among_mixed_repositories(
+    tmp_path,
+) -> None:
+    data = {
+        "uuid": "12345678-1234-5678-1234-567812345678",
+        "organisation": "InterDiode",
+        "configurations": {
+            "python": {
+                "repositories": [
+                    {
+                        "name": "interdiode",
+                        "index-url": "https://example.invalid/simple",
+                    },
+                    {
+                        "name": "insecure",
+                        "index-url": "http://insecure.invalid/simple",
+                    },
+                ]
+            }
+        },
+    }
+    config = Configuration.model_validate(data)
+    dst = tmp_path / "dst"
+    context = Context(config=config, dst=dst, src=None)
+
+    PythonModule().apply(context)
+
+    pip_conf = (dst / "etc/pip.conf").read_text(encoding="utf-8")
+    assert pip_conf == (
+        "[global]\n"
+        "index-url = https://example.invalid/simple\n"
+        "extra-index-url =\n"
+        "    http://insecure.invalid/simple\n"
+        "trusted-host =\n"
+        "    insecure.invalid\n"
+        "cert = /etc/ssl/certs/ca-certificates.crt\n"
+    )
+
+
+def test_apply_does_not_add_trusted_host_when_all_repositories_https(tmp_path) -> None:
+    config = Configuration.model_validate(ONE_REPO_CONFIG)
+    dst = tmp_path / "dst"
+    context = Context(config=config, dst=dst, src=None)
+
+    PythonModule().apply(context)
+
+    pip_conf = (dst / "etc/pip.conf").read_text(encoding="utf-8")
+    assert "trusted-host" not in pip_conf
+
+
 def test_apply_multiple_repositories(tmp_path) -> None:
     config = Configuration.model_validate(TWO_REPOS_CONFIG)
     dst = tmp_path / "dst"