feat(uninstall): add ghost uninstall command

closes TryGhost#187
- adds `ghost uninstall` command that will delete the ghost instance and
any related configuration files

lib/commands.js

@@ -120,7 +120,7 @@ module.exports = {
     },
 
     update: {
-        description: 'update a Ghost instance',
+        description: 'Update a Ghost instance',
 
         arguments: [
             {name: 'version', optional: true}
@@ -136,5 +136,9 @@ module.exports = {
             description: 'Force Ghost to update',
             flag: true
         }]
+    },
+
+    uninstall: {
+        description: 'Remove a Ghost instance & any related configuration files'
     }
 }

lib/commands/uninstall.js

@@ -0,0 +1,42 @@
+'use strict';
+const fs = require('fs-extra');
+
+const stop = require('./stop');
+const Config = require('../utils/config');
+const checkValidInstall = require('../utils/check-valid-install');
+
+module.exports.execute = function execute() {
+    checkValidInstall('uninstall');
+
+    this.ui.log('WARNING: Running this command will delete all of your themes, images, data, and any files related to this ghost instance!\n' +
+        'There is no going back!', 'yellow');
+
+    return this.ui.prompt({
+        type: 'confirm',
+        name: 'sure',
+        message: 'Are you sure you want to do this?',
+        default: false
+    }).then((answer) => {
+        if (!answer.sure) {
+            return Promise.reject(false);
+        }
+
+        let config = Config.load('.ghost-cli');
+
+        if (!config.get('running', false)) {
+            return Promise.resolve();
+        }
+
+        // If the instance is currently running we need to make
+        // sure it gets stopped
+        this.environment = config.get('running');
+        return stop.execute.apply(this);
+    }).then(() => {
+        let config = Config.load(fs.existsSync('config.production.json') ? 'production' : 'development');
+        this.service.setConfig(config);
+
+        return this.ui.run(this.service.callHook('uninstall'), 'Removing related configuration');
+    }).then(() => this.ui.run(() => {
+        return Promise.all(fs.readdirSync('.').map(file => fs.remove(file)));
+    }, 'Removing Ghost installation'));
+}

lib/services/index.js

@@ -164,7 +164,7 @@ class ServiceManager {
     }
 };
 
-ServiceManager.allowedHooks = ['setup', 'start', 'stop', 'run'];
+ServiceManager.allowedHooks = ['setup', 'start', 'stop', 'run', 'uninstall'];
 ServiceManager.knownServices = [
     // TODO: we only know about the nginx & built in process manager services
     // for now, in the future make this load globally installed services

lib/services/nginx/index.js

@@ -16,6 +16,7 @@ const STAGING_URL = 'https://acme-staging.api.letsencrypt.org/directory';
 class NginxService extends BaseService {
     init() {
         this.on('setup', 'setup');
+        this.on('uninstall', 'uninstall');
         this.command('nginx-conf', 'setupConf');
         this.command('nginx-ssl', 'setupSSL');
         // TODO implement
@@ -188,6 +189,16 @@ class NginxService extends BaseService {
         location._add('proxy_set_header', 'Host $http_host');
         location._add('proxy_pass', `http://127.0.0.1:${this.config.get('server.port')}`);
     }
+
+    uninstall() {
+        let confFile = `${this.parsedUrl.hostname}.conf`;
+
+        if (fs.existsSync(`/etc/nginx/sites-available/${confFile}`)) {
+            return this.ui.noSpin(() => execa.shell(`sudo rm /etc/nginx/sites-available/${confFile} && sudo rm /etc/nginx/sites-enabled/${confFile}`, {
+                stdio: 'inherit'
+            }).catch(() => Promise.reject(new errors.SystemError('Nginx config file could not be removed, you will need to do this manually.'))));
+        }
+    }
 };
 
 module.exports = {

lib/services/process/systemd/index.js

@@ -11,6 +11,7 @@ class SystemdProcess extends BaseProcess {
     init() {
         // Register hook with service manager
         this.on('setup', 'setup');
+        this.on('uninstall', 'uninstall');
     }
 
     get systemdName() {
@@ -34,6 +35,16 @@ class SystemdProcess extends BaseProcess {
         }));
     }
 
+    uninstall() {
+        let serviceFilename = `/lib/systemd/system/${this.systemdName}.service`;
+
+        if (fs.existsSync(serviceFilename)) {
+            return this.ui.noSpin(() => execa.shell(`sudo rm ${serviceFilename}`, {stdio: 'inherit'}).catch(() =>
+                Promise.reject(new errors.SystemError('Ghost systemd service file could not be removed, you will need to do it manually.'))
+            ));
+        }
+    }
+
     start() {
         return this.ui.noSpin(() => execa.shell(`sudo systemctl start ${this.systemdName}`, {stdio: 'inherit'}))
             .catch((error) => Promise.reject(new errors.ProcessError(error)));