Add sudo config parameter (#172)

Author: Napsty

README.md

@@ -95,6 +95,7 @@ discovery:
 scripts:
   - name: <string>
     command: <string>
+    sudo: <boolean>
     args:
       - <string>
     # by default the env cannot be overwritten by query parameters.
@@ -123,7 +124,9 @@ scripts_configs:
   - <string>
 ```
 
-The `name` of the script must be a valid Prometheus label value. The `command` string is the script which is executed with all arguments specified in `args`. To add dynamic arguments you can pass the `params` query parameter with a list of query parameters which values should be added as argument. The program will be executed directly, without a shell being invoked, and it is recommended that it be specified by path instead of relying on ``$PATH``.
+The `name` of the script must be a valid Prometheus label value. The `command` string is the script which is executed with all arguments specified in `args`. To add dynamic arguments you can pass the `params` query parameter with a list of query parameters which values should be added as argument. The program will be executed directly, without a shell being invoked, and it is recommended that it be specified by path instead of relying on ``$PATH``. 
+
+If `sudo` is defined and set to `true`, the command will be executed with privileged (root) permissions by executing the `command` with a pre-fixed `sudo`. Note that you still need to create the relevant sudoers entries, script_exporter will not do this for you.
 
 The optional `env` key allows to run the script with custom environment variables.
 

pkg/config/config.go

@@ -71,6 +71,7 @@ type ScriptConfig struct {
 	UseExpiredCacheOnError bool              `yaml:"useExpiredCacheOnError"`
 	CacheDuration          string            `yaml:"cacheDuration"`
 	Discovery              scriptDiscovery   `yaml:"discovery"`
+	Sudo                   bool              `yaml:"sudo"`
 }
 
 // LoadConfig reads the configuration file and umarshal the data into the config struct
@@ -159,6 +160,9 @@ func (c *Config) GetRunArgs(scriptName string) ([]string, error) {
 				return strings.Split(script.Script, " "), nil
 			}
 			var runArgs []string
+			if script.Sudo {
+				runArgs = append(runArgs, "sudo")
+			}
 			runArgs = append(runArgs, script.Command)
 			runArgs = append(runArgs, script.Args...)
 			return runArgs, nil