fix(v2): enforce v1 => v2 migration rules with zips

refs #759
- helpful for testing
- otherwise we allow a direct jump from e.g. 1.20 to 2.0 and this will crash
- it will crash because Ghost v2 can't execute v1 migration scripts, because the context/code has changed

lib/utils/version-from-zip.js

@@ -5,6 +5,7 @@ const errors = require('../errors');
 const semver = require('semver');
 const AdmZip = require('adm-zip');
 const cliPackage = require('../../package.json');
+const resolveVersion = require('./resolve-version');
 
 module.exports = function versionFromZip(zipPath, currentVersion, force = false) {
     if (!path.isAbsolute(zipPath)) {
@@ -47,11 +48,31 @@ module.exports = function versionFromZip(zipPath, currentVersion, force = false)
         }));
     }
 
-    if (force && semver.lt(pkg.version, currentVersion)) {
-        return Promise.reject(
-            new errors.SystemError('Zip file contains an older release version than what is currently installed.')
-        );
-    }
+    return resolveVersion(null, currentVersion, true)
+        .then((latestV1ReleaseVersion) => {
+            // CASE: if major diff and you are not on the latest v1
+            if (currentVersion && semver.major(currentVersion) !== semver.major(pkg.version) &&
+                currentVersion !== latestV1ReleaseVersion) {
+                return Promise.reject(new errors.SystemError({
+                    message: 'You are about to migrate to Ghost 2.0. Your blog is not on the latest Ghost 1.0 version.',
+                    help: 'Please run "ghost update --v1".'
+                }));
+            }
+
+            if (force && semver.lt(pkg.version, currentVersion)) {
+                return Promise.reject(
+                    new errors.SystemError('Zip file contains an older release version than what is currently installed.')
+                );
+            }
+
+            return Promise.resolve(pkg.version);
+        })
+        .catch((err) => {
+            // CASE: you are on latest v1, but you want to manually migrate to v2 using a zip
+            if (err.message.match(/No valid versions found/) && semver.major(currentVersion) !== semver.major(pkg.version)) {
+                return Promise.resolve(pkg.version);
+            }
 
-    return Promise.resolve(pkg.version);
+            throw err;
+        });
 };

test/unit/utils/version-from-zip-spec.js

@@ -24,6 +24,29 @@ describe('Unit: Utils > versionFromZip', function () {
         });
     });
 
+    it('rejects if you are not on the latest v1 release and you are trying to jump to the next major', function () {
+        const resolveVersionStub = sinon.stub().resolves('1.25.4');
+        const versionFromZip = proxyquire(modulePath, {
+            './resolve-version': resolveVersionStub
+        });
+
+        return versionFromZip(path.join(__dirname, '../../fixtures/ghost-2.0.zip'), '1.20.0').then(() => {
+            expect(false, 'error should have been thrown').to.be.true;
+        }).catch((error) => {
+            expect(error).to.be.an.instanceof(errors.SystemError);
+            expect(error.message).to.match(/You are about to migrate to Ghost 2.0/);
+        });
+    });
+
+    it('resolves if you are on the latest v1 release and you are trying to jump to the next major', function () {
+        const resolveVersionStub = sinon.stub().rejects(new Error('No valid versions found.'));
+        const versionFromZip = proxyquire(modulePath, {
+            './resolve-version': resolveVersionStub
+        });
+
+        return versionFromZip(path.join(__dirname, '../../fixtures/ghost-2.0.zip'), '1.25.4');
+    });
+
     it('rejects if zip file doesn\'t have a .zip extension', function () {
         const existsStub = sinon.stub().returns(true);
         const versionFromZip = proxyquire(modulePath, {