[Fixed] Govendor not consolidating common paths from the same SHA

[#156361589 finish]

Signed-off-by: Daniil Kouznetsov <dkouznetsov@pivotal.io>

lib/license_finder/package_managers/govendor.rb

@@ -1,3 +1,6 @@
+require 'license_finder/shared_helpers/common_path'
+require 'json'
+
 module LicenseFinder
   class Govendor < PackageManager
     def possible_package_paths
@@ -6,13 +9,12 @@ def possible_package_paths
 
     def current_packages
       file = File.read(detected_package_path)
-      json = JSON.parse(file)
-      packages = json['package']
+      packages = packages_from_json(file)
       packages.map do |package|
         GoPackage.from_dependency({
-                                    'ImportPath' => package['path'],
-                                    'InstallPath' => project_path.join('vendor', package['path']),
-                                    'Rev' => package['revision']
+                                    'ImportPath' => package[:path],
+                                    'InstallPath' => project_path.join('vendor', package[:path]),
+                                    'Rev' => package[:sha]
                                   }, nil, true)
       end
     end
@@ -28,5 +30,32 @@ def self.package_management_command
     def self.prepare_command
       'govendor sync'
     end
+
+    private
+
+    def packages_from_json(json_string)
+      data = JSON.parse(json_string)
+      packages = data['package']
+
+      packages_by_sha = {}
+
+      packages.each do |package|
+        package_path = package['path']
+        package_revision = package['revision']
+        if packages_by_sha[package_revision].nil?
+          packages_by_sha[package_revision] = [package_path]
+        else
+          packages_by_sha[package_revision] << package_path
+        end
+      end
+
+      result = []
+      packages_by_sha.each do |sha, paths|
+        common_paths = CommonPathHelper.shortest_common_paths(paths)
+        common_paths.each { |cp| result << { sha: sha, path: cp } }
+      end
+
+      result
+    end
   end
 end

spec/fixtures/config/govendor_common_paths.json

@@ -0,0 +1,19 @@
+{
+  "comment": "",
+  "ignore": "test",
+  "package": [
+    {
+      "checksumSHA1": "4Tc07iR3HloUYC4HNT4xc0875WY=",
+      "path": "foo/Bowery/prompt",
+      "revision": "0f1139e9a1c74b57ccce6bdb3cd2f7cd04dd3449",
+      "revisionTime": "2017-02-19T07:16:37Z"
+    },
+    {
+      "checksumSHA1": "6VGFARaK8zd23IAiDf7a+gglC8k=",
+      "path": "foo/Bowery/safefile",
+      "revision": "0f1139e9a1c74b57ccce6bdb3cd2f7cd04dd3449",
+      "revisionTime": "2015-10-22T12:31:44+02:00"
+    }
+  ],
+  "rootPath": "foo/kardianos/govendor"
+}

spec/lib/license_finder/package_managers/govendor_spec.rb

@@ -27,6 +27,26 @@ module LicenseFinder
           expect(subject.current_packages.last.version).to eq '855e8d98f1852d48dde521e0522408d1fe7e836a'
         end
       end
+
+      context 'when there are common paths' do
+        let(:content) do
+          FakeFS.without do
+            fixture_from('govendor_common_paths.json')
+          end
+        end
+
+        it 'returns the packages described by vendor/vendor.json with commmon paths consolidated' do
+          FakeFS do
+            FileUtils.mkdir_p '/app/vendor'
+            File.write('/app/vendor/vendor.json', content)
+
+            expect(subject.current_packages.length).to eq 1
+
+            expect(subject.current_packages.first.name).to eq 'foo/Bowery'
+            expect(subject.current_packages.first.version).to eq '0f1139e9a1c74b57ccce6bdb3cd2f7cd04dd3449'
+          end
+        end
+      end
     end
 
     describe '.prepare_command' do