Migrate to go mod

.drone.yml

@@ -13,20 +13,27 @@ pipeline:
   test-general:
     image: webhippie/golang:edge
     pull: true
+    environment:
+      - GO111MODULE=on
     commands:
       - make clean
       - make vet
       - make lint
       - make build
+      - go mod vendor #Used as a cache across pipeline (could be improve by caching go env GOCACHE across pipeline)
   testing-git-latest:
     image: webhippie/golang:edge
     pull: true
+    environment:
+      - GO111MODULE=on
     commands:
       - git update-ref refs/heads/test HEAD
       - git --version && make test
   testing-git-1.7:
     image: docker.kbt.io/gitea-git-ci:1.7
     pull: true
+    environment:
+      - GO111MODULE=on
     commands:
       - git update-ref refs/heads/test HEAD
       - PATH=/opt/git-1.7.2/bin git --version && make test

.gitignore

@@ -27,3 +27,5 @@ coverage.out
 
 benchmark/
 tests/repos/repo1/
+
+vendor/

go.mod

@@ -0,0 +1,12 @@
+module code.gitea.io/git
+
+require (
+	github.com/Unknwon/com v0.0.0-20170819223952-7677a1d7c113
+	github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e // indirect
+	github.com/jtolds/gls v4.2.1+incompatible // indirect
+	github.com/mcuadros/go-version v0.0.0-20161105183618-257f7b9a7d87
+	github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d // indirect
+	github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c // indirect
+	github.com/stretchr/testify v1.2.2
+	gopkg.in/src-d/go-git.v4 v4.8.1
+)