fix(update): fixed permission issues when linking themes

refs https://forum.ghost.org/t/permission-denied-when-updating-source-theme-linking/41651/5

- if we're in an environment that uses the `ghost` user, `ghost-mgr`
  doesn't have permissions to do these steps after we've already chown'd
  the folder
- in that case, we should sudo to the `ghost` user to run these commands

Author: daniellockyer

lib/commands/update.js

@@ -6,6 +6,7 @@ const symlinkSync = require('symlink-or-copy').sync;
 const {GhostError} = require('../errors');
 const Command = require('../command');
 const DoctorCommand = require('./doctor');
+const ghostUser = require('../utils/use-ghost-user');
 
 class UpdateCommand extends Command {
     static configureOptions(commandName, yargs, extensions) {
@@ -43,6 +44,7 @@ class UpdateCommand extends Command {
             instance,
             force,
             activeVersion: instance.version,
+            ui: this.ui,
             version,
             zip,
             v1
@@ -230,7 +232,7 @@ class UpdateCommand extends Command {
         instance.nodeVersion = process.versions.node;
     }
 
-    linkDefaultThemes({instance, rollback}) {
+    async linkDefaultThemes({instance, rollback, ui}) {
         const currentThemesDir = path.join(process.cwd(), 'current', 'content', 'themes');
         const contentThemesDir = path.join(instance.config.get('paths.contentPath'), 'themes');
         // remove any broken symlinks caused by default themes no longer existing in previous version
@@ -239,7 +241,11 @@ class UpdateCommand extends Command {
                 const installedThemes = fs.readdirSync(contentThemesDir);
                 for (const theme of installedThemes) {
                     if (!fs.existsSync(path.join(contentThemesDir, theme))) {
-                        fs.rmSync(path.join(contentThemesDir, theme));
+                        if (ghostUser.shouldUseGhostUser(contentThemesDir)) {
+                            await ui.sudo(`rm ${path.join(contentThemesDir, theme)}`, {sudoArgs: '-E -u ghost'});
+                        } else {
+                            fs.unlinkSync(path.join(contentThemesDir, theme));
+                        }
                     }
                 }
             }
@@ -250,10 +256,14 @@ class UpdateCommand extends Command {
             const defaultThemes = fs.readdirSync(currentThemesDir);
             for (const theme of defaultThemes) {
                 if (!fs.existsSync(path.join(contentThemesDir, theme))) {
-                    symlinkSync(
-                        path.join(currentThemesDir, theme),
-                        path.join(contentThemesDir, theme)
-                    );
+                    if (ghostUser.shouldUseGhostUser(contentThemesDir)) {
+                        await ui.sudo(`ln -s ${path.join(currentThemesDir, theme)} ${path.join(contentThemesDir, theme)}`, {sudoArgs: '-E -u ghost'});
+                    } else {
+                        symlinkSync(
+                            path.join(currentThemesDir, theme),
+                            path.join(contentThemesDir, theme)
+                        );
+                    }
                 }
             }
         }

test/unit/commands/update-spec.js

@@ -240,6 +240,7 @@ describe('Unit: Commands > Update', function () {
                 force: false,
                 instance: fakeInstance,
                 activeVersion: '2.0.0',
+                ui,
                 zip: '',
                 v1: false
             });
@@ -314,6 +315,7 @@ describe('Unit: Commands > Update', function () {
                 version: '2.0.0',
                 force: false,
                 instance: fakeInstance,
+                ui,
                 activeVersion: '1.25.0',
                 zip: '',
                 v1: false
@@ -357,6 +359,7 @@ describe('Unit: Commands > Update', function () {
                 force: false,
                 instance: fakeInstance,
                 activeVersion: '1.0.0',
+                ui: ui,
                 zip: '',
                 v1: false
             });
@@ -424,6 +427,7 @@ describe('Unit: Commands > Update', function () {
                 instance: fakeInstance,
                 activeVersion: '1.1.0',
                 installPath: '/var/www/ghost/versions/1.0.0',
+                ui: ui,
                 rollback: true,
                 zip: '',
                 v1: false
@@ -546,6 +550,7 @@ describe('Unit: Commands > Update', function () {
                 instance: fakeInstance,
                 activeVersion: '1.1.0',
                 installPath: '/var/www/ghost/versions/1.0.0',
+                ui,
                 rollback: true,
                 zip: '',
                 v1: true
@@ -613,6 +618,7 @@ describe('Unit: Commands > Update', function () {
                 instance: fakeInstance,
                 activeVersion: '1.1.0',
                 installPath: '/var/www/ghost/versions/1.0.0',
+                ui,
                 rollback: true,
                 zip: '',
                 v1: false