Added command output regexp check

Fixes #31

misc.go

@@ -29,6 +29,23 @@ func command(parameters []string) (exitCode int, exitMessage string) {
 	return 1, exitMessage
 }
 
+// commandOutputMatches checks to see if a command's combined output matches a
+// given regexp
+func commandOutputMatches(parameters []string) (exitCode int, exitMessage string) {
+	toExec := parameters[0]
+	re := parseUserRegex(parameters[1])
+	cmd := exec.Command("bash", "-c", toExec)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		execError(cmd, string(out), err)
+	}
+	if re.Match(out) {
+		return 0, ""
+	}
+	msg := "Command output did not match regexp"
+	return genericError(msg, re.String(), []string{string(out)})
+}
+
 // running checks if a process is running using `ps aux`, and searching for the
 // process name, excluding this process (in case the process name is in the JSON
 // file name)

register.go

@@ -7,6 +7,7 @@ func registerCheck(name string, work Worker, numParams int) {
 
 func registerChecks() {
 	registerCheck("command", command, 1)
+	registerCheck("commandoutputmatches", commandOutputMatches, 2)
 	registerCheck("running", running, 1)
 	registerCheck("phpconfig", phpConfig, 2)
 	registerCheck("file", file, 1)

samples/misc-fail.json

@@ -39,6 +39,14 @@
         {
             "Check" : "cpuUsage",
             "Parameters" : ["1"]
+        },
+        {
+            "Check" : "command",
+            "Parameters" : ["sleep fail"]
+        },
+        {
+            "Check" : "commandOutputMatches",
+            "Parameters" : ["echo doesntwork", "\\d+oesnt\\work"]
         }
     ]
 }

samples/misc.json

@@ -38,6 +38,14 @@
         {
             "Check" : "cpuUsage",
             "Parameters" : ["95"]
+        },
+        {
+            "Check" : "command",
+            "Parameters" : ["sleep .00001"]
+        },
+        {
+            "Check" : "commandOutputMatches",
+            "Parameters" : ["echo works", "\\w[aeiou]+(y)*r[kl]s"]
         }
     ]
 }