Merge ~cjwatson/launchpad:charm-codehosting-sync-branches-action into launchpad:master

[Colin Watson]

charm: Add a sync-branches action to launchpad-codehosting

Since this needs to be used by the staging-restore script, it's neater to wrap it up in an action.

[Simone Pelosi (pelpsi)]

LGTM!

review: Approve

diff --git a/charm/launchpad-codehosting/actions.yaml b/charm/launchpad-codehosting/actions.yaml
index 86aae0a..bca43bd 100644
--- a/charm/launchpad-codehosting/actions.yaml
+++ b/charm/launchpad-codehosting/actions.yaml
@@ -9,3 +9,12 @@ stop-services:
     will persist across a reboot.  It also doesn't disable cron jobs, since
     those are handled by the cron-control mechanism instead; see
     lp.services.scripts.base.cronscript_enabled.)
+sync-branches:
+  description: |
+    Sync branch data from production to a non-production environment.
+  params:
+    branches:
+      type: string
+      description: A space-separated list of branches to sync.
+  required:
+    - branches
diff --git a/charm/launchpad-codehosting/actions/actions.py b/charm/launchpad-codehosting/actions/actions.py
index cbac43e..a424399 100755
--- a/charm/launchpad-codehosting/actions/actions.py
+++ b/charm/launchpad-codehosting/actions/actions.py
@@ -15,6 +15,7 @@ basic.bootstrap_charm_deps()
 basic.init_config_states()
 
 from charmhelpers.core import hookenv  # noqa: E402
+from ols import base  # noqa: E402
 
 
 def start_services():
@@ -31,6 +32,22 @@ def stop_services():
     hookenv.action_set({"result": "Services stopped"})
 
 
+def sync_branches():
+    params = hookenv.action_get()
+    script = Path(base.code_dir(), "scripts", "sync-branches.py")
+    command = [
+        "sudo",
+        "-H",
+        "-u",
+        base.user(),
+        "LPCONFIG=launchpad-codehosting",
+        "--",
+        script,
+    ] + params["branches"].split()
+    subprocess.run(command, check=True)
+    hookenv.action_set({"result": "Branches synced"})
+
+
 def main(argv):
     action = Path(argv[0]).name
     try:
@@ -38,6 +55,8 @@ def main(argv):
             start_services()
         elif action == "stop-services":
             stop_services()
+        elif action == "sync-branches":
+            sync_branches()
         else:
             hookenv.action_fail(f"Action {action} not implemented.")
     except Exception:
diff --git a/charm/launchpad-codehosting/actions/sync-branches b/charm/launchpad-codehosting/actions/sync-branches
new file mode 120000
index 0000000..405a394
--- /dev/null
+++ b/charm/launchpad-codehosting/actions/sync-branches
@@ -0,0 +1 @@
+actions.py
\ No newline at end of file