1 files changed, 99 insertions, 0 deletions
diff --git a/taskcluster/gecko_taskgraph/actions/merge_automation.py b/taskcluster/gecko_taskgraph/actions/merge_automation.py
new file mode 100644
index 0000000000..8b9455536b
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/actions/merge_automation.py
@@ -0,0 +1,99 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from taskgraph.parameters import Parameters
+
+from gecko_taskgraph.actions.registry import register_callback_action
+from gecko_taskgraph.decision import taskgraph_decision
+from gecko_taskgraph.util.attributes import RELEASE_PROMOTION_PROJECTS
+
+
+def is_release_promotion_available(parameters):
+    return parameters["project"] in RELEASE_PROMOTION_PROJECTS
+
+
+@register_callback_action(
+    name="merge-automation",
+    title="Merge Day Automation",
+    symbol="${input.behavior}",
+    description="Merge repository branches.",
+    permission="merge-automation",
+    order=500,
+    context=[],
+    available=is_release_promotion_available,
+    schema=lambda graph_config: {
+        "type": "object",
+        "properties": {
+            "force-dry-run": {
+                "type": "boolean",
+                "description": "Override other options and do not push changes",
+                "default": True,
+            },
+            "push": {
+                "type": "boolean",
+                "description": "Push changes using to_repo and to_branch",
+                "default": False,
+            },
+            "behavior": {
+                "type": "string",
+                "description": "The type of release promotion to perform.",
+                "enum": sorted(graph_config["merge-automation"]["behaviors"].keys()),
+                "default": "central-to-beta",
+            },
+            "from-repo": {
+                "type": "string",
+                "description": "The URI of the source repository",
+            },
+            "to-repo": {
+                "type": "string",
+                "description": "The push URI of the target repository",
+            },
+            "from-branch": {
+                "type": "string",
+                "description": "The fx head of the source, such as central",
+            },
+            "to-branch": {
+                "type": "string",
+                "description": "The fx head of the target, such as beta",
+            },
+            "ssh-user-alias": {
+                "type": "string",
+                "description": "The alias of an ssh account to use when pushing changes.",
+            },
+            "fetch-version-from": {
+                "type": "string",
+                "description": "Path to file used when querying current version.",
+            },
+        },
+        "required": ["behavior"],
+    },
+)
+def merge_automation_action(parameters, graph_config, input, task_group_id, task_id):
+
+    # make parameters read-write
+    parameters = dict(parameters)
+
+    parameters["target_tasks_method"] = "merge_automation"
+    parameters["merge_config"] = {
+        "force-dry-run": input.get("force-dry-run", False),
+        "behavior": input["behavior"],
+    }
+
+    for field in [
+        "from-repo",
+        "from-branch",
+        "to-repo",
+        "to-branch",
+        "ssh-user-alias",
+        "push",
+        "fetch-version-from",
+    ]:
+        if input.get(field):
+            parameters["merge_config"][field] = input[field]
+    parameters["tasks_for"] = "action"
+
+    # make parameters read-only
+    parameters = Parameters(**parameters)
+
+    taskgraph_decision({"root": graph_config.root_dir}, parameters=parameters)