refactor(installer): check that the linux installer program exists first

Author: malept

src/installers/linux/deb.js

@@ -1,8 +1,10 @@
 import pify from 'pify';
 import sudo from 'sudo-prompt';
 
+import linuxInstaller from '../../util/linux-installer';
+
 export default async (filePath) => {
-  await pify(sudo.exec)(`gdebi -n ${filePath}`, {
+  linuxInstaller('Debian', 'gdebi', pify(sudo.exec)(`gdebi -n ${filePath}`, {
     name: 'Electron Forge',
-  });
+  }));
 };

src/util/linux-installer.js

@@ -0,0 +1,9 @@
+import { spawnSync } from 'child_process';
+
+export default async (type, prog, promise) => {
+  if (spawnSync('which', [prog]).status === 0) {
+    await promise;
+  } else {
+    throw new Error(`${prog} is required to install ${type} packages`);
+  }
+};