gitlab: Add a script to build manifest from a gitlab CI context

diff --git a/gitlab/build_manifest.py b/gitlab/build_manifest.py
new file mode 100755 (executable)
index 0000000..0a7c7be
--- /dev/null
+++ b/gitlab/build_manifest.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+
+import os
+import requests
+import sys
+
+
+GSTREAMER_MODULES = [
+    'gst-build',
+    'gstreamer',
+    'gst-plugins-base',
+    'gst-plugins-good',
+    'gst-plugins-bad',
+    'gst-plugins-ugly',
+    'gst-libav',
+    'gst-devtools',
+    'gst-docs',
+    'gst-editing-services',
+    'gst-omx',
+    'gst-python',
+    'gst-rtsp-server'
+]
+
+MANIFEST_TEMPLATE = """<?xml version="1.0" encoding="UTF-8"?>
+<manifest>
+  <remote fetch="%s" name="user"/>
+  <remote fetch="https://gitlab.freedesktop.org/gstreamer/" name="gstreamer"/>
+  <remote fetch="git://anongit.freedesktop.org/gstreamer/" name="origin"/>
+%s
+</manifest>"""
+
+
+def request(path):
+    gitlab_header = {'JOB_TOKEN': os.environ["CI_JOB_TOKEN"]}
+
+    return requests.get('https://gitlab.gnome.org/api/v4/' + path, headers=gitlab_header).json()
+
+
+def find_repository_sha(module, branchname):
+    for project in request('projects?search=' + module):
+        if project['name'] != module:
+            continue
+
+        if 'namespace' not in project:
+            # print("No 'namespace' in: %s - ignoring?" % project, file=sys.stderr)
+            continue
+
+        if project['namespace']['name'] in useful_namespaces:
+            if project['namespace']['name'] == user_namespace:
+                # If we have a branch with same name, use it.
+                for branch in request('%s/repository/branches' % project['id']):
+                    if branch['name'] == branchname:
+                        print("%s/%s" % (project['namespace']['name'], branchname))
+
+                        return 'user', branch['commit']['id']
+            else:
+                for branch in request('%s/repository/branches"' % project['id']):
+                    if branch['name'] == branchname:
+                        print("gstreamer/%s" % (branchname))
+                        return 'gstreamer', branch['commit']['id']
+
+                branch, = request('%s/repository/branches?search=master' % project['id'])
+                print('gstreamer/master')
+                return 'gstreamer', branch.attributes['commit']['id']
+
+    print('origin/master')
+    return 'origin', 'master'
+
+if __name__ == "__main__":
+    user_namespace = os.environ['CI_PROJECT_NAMESPACE']
+    project_name = os.environ['CI_PROJECT_NAME']
+    branchname = os.environ['CI_COMMIT_REF_NAME']
+
+    useful_namespaces = ['gstreamer']
+    if branchname != 'master':
+        useful_namespaces.append(user_namespace)
+
+    # Shouldn't be needed.
+    remote = "git://anongit.freedesktop.org/gstreamer/"
+    projects = ''
+    project_template = '  <project name="%s" remote="%s" revision="%s" />\n'
+    user_remote = os.path.dirname(os.environ['CI_PROJECT_URL'])
+    for module in GSTREAMER_MODULES:
+        print("Checking %s:" % module, end=' ')
+
+        remote = "origin"
+        revision = None
+        if module == project_name:
+            revision = os.environ['CI_COMMIT_SHA']
+            remote = "user"
+            print("%s/%s" % (user_namespace, branchname))
+        else:
+            remote, revision = find_repository_sha(module, branchname)
+
+        if not revision:
+            revision = 'master'
+        projects += project_template % (module, remote, revision)
+
+    with open('manifest.xml', mode='w') as manifest:
+        print(MANIFEST_TEMPLATE % (user_remote, projects), file=manifest)