feat(process): update running check to call process manager

closes #207
- updates the running check to make sure the process is actually running
- adds a method to the process manager class (required to implement)

extensions/systemd/systemd.js

@@ -18,6 +18,21 @@ class SystemdProcessManager extends cli.ProcessManager {
             .catch((error) => Promise.reject(new cli.errors.ProcessError(error)));
     }
 
+    isRunning() {
+        try {
+            execa.shellSync(`systemctl is-active ${this.systemdName}`);
+            return true;
+        } catch (e) {
+            // systemctl is-active returns exit code 3 when a service isn't active,
+            // so throw if we don't have that.
+            if (e.code !== 3) {
+                throw e;
+            }
+
+            return false;
+        }
+    }
+
     static willRun() {
         try {
             execa.shellSync('which systemctl', {stdio: 'ignore'});

lib/instance.js

@@ -25,9 +25,23 @@ class Instance {
         return true;
     }
 
-    // TODO: extend to support process manager run check
     get running() {
-        return this.cliConfig.has('running');
+        if (!this.cliConfig.has('running')) {
+            return false;
+        }
+
+        // Ordinarily we'd use this.loadRunningConfig(), but stack overflow
+        // (the error not the programming bible) happens if we do that.
+        let env = this.cliConfig.get('running');
+        this.config = new Config(path.join(this.dir, `config.${env}.json`));
+        this.loadProcess();
+
+        if (!this.process.isRunning(this.dir)) {
+            this.cliConfig.set('running', null);
+            return false;
+        }
+
+        return true;
     }
     set running(environment) {
         this.cliConfig.set('running', environment).save();

lib/process-manager.js

@@ -1,7 +1,8 @@
 'use strict';
 const requiredMethods = [
     'start',
-    'stop'
+    'stop',
+    'isRunning'
 ];
 
 class ProcessManager {
@@ -36,6 +37,10 @@ class ProcessManager {
         throw error;
     }
 
+    isRunning() {
+        // Base Implementation
+    }
+
     /**
      * This function checks if this process manager can be used on this system
      *

lib/utils/local-process.js

@@ -4,6 +4,7 @@ const path = require('path');
 const fkill = require('fkill');
 const spawn = require('child_process').spawn;
 const assign = require('lodash/assign');
+const isRunning = require('is-running');
 
 const errors = require('../errors');
 const ProcessManager = require('../process-manager');
@@ -77,6 +78,26 @@ class LocalProcess extends ProcessManager {
         if (process.send) {process.send({error: true, message: error.message});}
     }
 
+    isRunning(cwd) {
+        let pidfile = path.join(cwd, PID_FILE);
+
+        if (!fs.existsSync(pidfile)) {
+            // Even if the process exists, if the file has been deleted we really can't
+            // determine if it's still running, so just assume it's not.
+            return false;
+        }
+
+        let pid = parseInt(fs.readFileSync(pidfile));
+        let running = isRunning(pid);
+
+        if (!running) {
+            // If not running, cleanup the pid file
+            fs.removeSync(pidfile);
+        }
+
+        return running;
+    }
+
     static willRun() {
         return true;
     }

package.json

@@ -51,6 +51,7 @@
     "ghost-ignition": "2.8.11",
     "greenlock-cli": "2.2.9",
     "inquirer": "3.1.1",
+    "is-running": "2.1.0",
     "knex-migrator": "2.0.16",
     "listr": "0.12.0",
     "lodash": "4.17.4",

yarn.lock

@@ -1791,6 +1791,10 @@ is-retry-allowed@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-retry-allowed/-/is-retry-allowed-1.1.0.tgz#11a060568b67339444033d0125a61a20d564fb34"
 
+is-running@2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-running/-/is-running-2.1.0.tgz#30a73ff5cc3854e4fc25490809e9f5abf8de09e0"
+
 is-stream@^1.0.0, is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
@@ -3088,11 +3092,11 @@ resolve-from@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-1.0.1.tgz#26cbfe935d1aeeeabb29bc3fe5aeb01e93d44226"
 
-resolve@1.1.7, resolve@1.1.x, resolve@^1.1.6, resolve@^1.1.7, resolve@~1.1.7:
+resolve@1.1.7, resolve@1.1.x, resolve@~1.1.7:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
 
-resolve@^1.2.0:
+resolve@^1.1.6, resolve@^1.1.7, resolve@^1.2.0:
   version "1.3.3"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.3.3.tgz#655907c3469a8680dc2de3a275a8fdd69691f0e5"
   dependencies: