Migrate Zuul CI users to Fedora CI (#672)

Migrate Zuul CI users to Fedora CI

TODO:

 Update the package list with all the current Zuul CI users
 Prepare announcement email, see scripts/migrate-zuul-users.py
 Do the announcement and gather feedback (devel-lists, discussion)
 Merge and profit?
 Disable Zuul CI for dist-git PRs (Full disablement requires at least packit/packit-service#2920)
 Adjust the script to instead add new contributors similar to zuul-config-generator (Handled in #679)

Blocked by packit/packit-service#2856
RELEASE NOTES BEGIN
Zuul CI users have been migrated to Fedora CI
RELEASE NOTES END

Reviewed-by: František Lachman <flachman@redhat.com>
Reviewed-by: Cristian Le <github@lecris.me>
Reviewed-by: Nikola Forró
Reviewed-by: Laura Barcziová
Reviewed-by: Vít Ondruch

Author: centosinfra-prod-github-app[bot]

scripts/migrate-zuul-users.py

@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+
+# Copyright Contributors to the Packit project.
+# SPDX-License-Identifier: MIT
+
+# /// script
+# dependencies = [
+#   "ruamel.yaml",
+#   "requests",
+# ]
+# ///
+
+import copy
+
+import requests
+import ruamel.yaml
+from pathlib import Path
+
+# Constants
+ZUUL_YAML = "https://pagure.io/fedora-project-config/raw/master/f/resources/fedora-distgits.yaml"
+SCRIPTS_DIR = Path(__file__).parent
+ROOT_DIR = SCRIPTS_DIR.parent
+packit_service_file = ROOT_DIR / "secrets/packit/prod/packit-service.yaml.j2"
+SKIP_JINJA_LINES = 32
+DIST_GIT_FORMAT = r"https://src.fedoraproject.org/rpms/{}"
+
+MAILING_LIST_ANNOUNCEMENT = """
+Dear package maintainers currently using Zuul,
+
+Packit as Fedora dist-git CI has recently reached feature-parity with the Zuul CI, and as the first step
+in the final phase implementation of the "Packit as dist-git CI" change [1] we are migrating
+the current Zuul CI users to packit Fedora CI [2] and disabling the Zuul runners on
+src.fedoraproject.org/rpms/* for the time being.
+
+Our plan is to automatically migrate the Zuul dist-git packages on 2026-01-12 (January 12).
+Please let us know of any concerns you might have with the migration up until then so we can decide whether
+we can go forward with it. We will send another reminder of this as a reply to this announcement one week
+before the migration 2026-01-05 (January 5).
+
+After the packages are migrated we will monitor your feedback [3-6] on this migration and decide if we can go ahead
+with the Zuul deprecation and disablement or need to resolve any blocking issues first. We could also keep the
+Zuul CI temporarily running on a small subset of packages if requested.
+
+We are looking forward to your feedback on this matter.
+
+PS: The migration of the other Zuul jobs that are linked to pagure.io [7] will be addressed at a later
+time as these require custom handling and are tied with the forge migration. We do not have a timeline
+for this part yet, but we will provide an update as soon as we have a plan for this.
+
+[1]: https://fedoraproject.org/wiki/Changes/PackitDistgitCI
+[2]: https://github.com/packit/deployment/pull/672
+[3]: Fedora CI channel https://matrix.to/#/#fedora-ci:fedoraproject.org
+[4]: Packit channel https://matrix.to/#/#packit:fedora.im
+[5]: Packit issues https://github.com/packit/packit-service/issues/new?template=fedora-ci.yml
+[6]: This email and discussion thread
+[7]: https://pagure.io/fedora-project-config/blob/master/f/resources/fedora-sources.yaml
+"""
+
+# Using ruamel.yaml to preserve comments and format
+packit_service_yaml = ruamel.yaml.YAML()
+packit_service_yaml.indent(mapping=2, sequence=4, offset=2)
+
+# Get the current projects subscribed to zuul
+response = requests.get(ZUUL_YAML)
+fedora_dstgits = ruamel.yaml.YAML().load(response.content)
+zuul_projects = [
+    list(item.keys())[0].removeprefix("rpms/")
+    for item in fedora_dstgits["resources"]["projects"]["Fedora-Distgits"][
+        "source-repositories"
+    ]
+]
+
+# Get the current packit-service.yaml.j2 file
+with packit_service_file.open("r") as f:
+    jinja_lines = []
+    for _ in range(SKIP_JINJA_LINES):
+        jinja_lines.append(next(f))
+    packit_service = packit_service_yaml.load(f.read())
+
+# Onboard all the missing users
+fedora_ci_projects = copy.copy(packit_service["enabled_projects_for_fedora_ci"])
+previous_count = len(fedora_ci_projects)
+for project in zuul_projects:
+    dist_git_url = DIST_GIT_FORMAT.format(project)
+    if dist_git_url not in fedora_ci_projects:
+        fedora_ci_projects.append(dist_git_url)
+new_count = len(fedora_ci_projects)
+
+# Update the packit-service.yaml.j2 file
+print(f"Number of projects added: {new_count - previous_count}")
+packit_service["enabled_projects_for_fedora_ci"] = sorted(fedora_ci_projects)
+with packit_service_file.open("w") as f:
+    for line in jinja_lines:
+        f.write(line)
+    packit_service_yaml.dump(packit_service, f)