Merge pull request #1010 from bbassie/feature/plugin-browser

Plugin management through web interface

docs/managing-a-cluster.md

@@ -283,10 +283,15 @@ This command lists all plugins currently known to the remote. Newly installed pl
 
 ### Update
 
-    ctl> controller plugin update <name> [--restart]
-    ctl> host plugin update <host> <name> [--restart]
+    ctl> controller plugin update <name>[@<version>] [--restart]
+    ctl> host plugin update <host> <name>[@<version>] [--restart]
 
-If remote plugin updates are enabled on the remote, this will execute `npm update --save <name>`. Changes will not be applied until the remote is restarted. If the `--restart` flag is provided, the remote will automatically restart once the update is complete.
+If remote plugin updates are enabled on the remote, this will execute `npm update --save <name>`, which stays within the version range saved in the remote's `package.json`.
+To update to a specific version, including one outside that range, pass it as `<name>@<version>`, for example `@clusterio/plugin-example@2.1.0`.
+The version must be published on npm, and the remote then executes `npm install --save <name>@<version>`.
+The plugin must already be installed on the remote, and only remote plugin updates need to be enabled.
+Changes will not be applied until the remote is restarted.
+If the `--restart` flag is provided, the remote will automatically restart once the update is complete.
 
 ### Update All
 
@@ -297,10 +302,30 @@ Updates the Clusterio package and all plugins installed from npm in a single `np
 
 ### Install
 
-    ctl> controller plugin install <name> [--restart]
-    ctl> host plugin install <host> <name> [--restart]
+    ctl> controller plugin install <name>[@<version>] [--restart]
+    ctl> host plugin install <host> <name>[@<version>] [--restart]
+
+If remote plugin installs are enabled on the remote, this will execute `npm install --save <name>`.
+Pass `<name>@<version>` to install a specific version, for example to match the version used by the rest of the cluster.
+The package, and the version if given, must be published on npm.
+Changes will not be applied until the remote is restarted.
+If the `--restart` flag is provided, the remote will automatically restart once the update is complete.
+
+### Search
+
+    ctl> controller plugin search [query] [--page <n>] [--page-size <n>]
+
+Searches the npm registry for packages tagged with the clusterio-plugin keyword.
+The search is done by the controller and does not require remote installs to be enabled.
+The web UI has a plugin browser on the plugins page that uses the same search.
+
+### Concurrent Operations
+
+Only one npm operation runs at a time on a machine.
+A standalone controller and host share their working directory, so the operation holds the `npm-operation.lock` file there while npm runs.
+Other installs and updates on the same machine or installation are rejected with "Another package operation is already in progress on this machine" until it finishes.
+A lock file left behind by a process that is no longer running is removed automatically.
 
-If remote plugin installs are enabled on the remote, this will execute `npm install --save <name>`. Changes will not be applied until the remote is restarted. If the `--restart` flag is provided, the remote will automatically restart once the update is complete.
 
 ### Enable/Disable Updates