Fixed ghost update --force to jump to next major if you are on latest v1

refs #759

Author: kirrg001

lib/utils/resolve-version.js

@@ -29,7 +29,15 @@ module.exports = function resolveVersion(version, activeVersion, v1 = false, for
     }
 
     return yarn(['info', 'ghost', 'versions', '--json']).then((result) => {
-        let comparator = !force && activeVersion ? `>${activeVersion}` : MIN_RELEASE;
+        let comparator;
+
+        if (!force && activeVersion) {
+            comparator = `>${activeVersion}`;
+        } else if (force && activeVersion) {
+            comparator = `>=${activeVersion}`;
+        } else {
+            comparator = MIN_RELEASE;
+        }
 
         if (v1) {
             comparator += ' <2.0.0';
@@ -55,23 +63,17 @@ module.exports = function resolveVersion(version, activeVersion, v1 = false, for
 
             let versionToReturn = version || versions.pop();
 
-            if (v1 && activeVersion && semver.satisfies(activeVersion, '^2.0.0')) {
-                return Promise.reject(new errors.CliError({
-                    message: 'You can\'t downgrade from v2 to v1 using these options.',
-                    help: 'Please run "ghost update --rollback".'
-                }));
-            }
-
             // CASE: you haven't passed `--v1` and you are not about to install a fresh blog
             if (!v1 && activeVersion) {
                 const majorVersionJump = semver.major(activeVersion) !== semver.major(versionToReturn);
 
-                // CASE: use latest v1 release
-                if (majorVersionJump && force) {
+                // CASE 1: you want to force update and you are not on the latest v1 version
+                // CASE 2: you don't use force and you are not on the latest v1 version
+                if (majorVersionJump && force && versions.length > 1) {
                     while (!semver.satisfies(versionToReturn, '^1.0.0')) {
                         versionToReturn = versions.pop();
                     }
-                } else if (majorVersionJump && versions.length) {
+                } else if (majorVersionJump && !force && versions.length) {
                     return Promise.reject(new errors.CliError({
                         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".'

test/unit/utils/resolve-version-spec.js

@@ -166,12 +166,12 @@ describe('Unit: resolveVersion', function () {
                     });
             });
 
-            it('force updating', function () {
+            it('force updating and you are on the latest v1', function () {
                 stubYarn('{"data": ["1.23.0", "1.25.1", "1.25.2", "2.0.0"]}');
 
                 return resolveVersion(null, '1.25.2', false, true)
                     .then(function (version) {
-                        expect(version).to.eql('1.25.2');
+                        expect(version).to.eql('2.0.0');
                     });
             });
 
@@ -202,7 +202,7 @@ describe('Unit: resolveVersion', function () {
                     })
                     .catch(function (error) {
                         expect(error).to.be.an.instanceOf(Error);
-                        expect(error.message).to.equal('You can\'t downgrade from v2 to v1 using these options.');
+                        expect(error.message).to.equal('No valid versions found.');
                     });
             });