Add explicit dependency versions

Version constraints are copied from existing Bazel rules. In the
future, these version upgrades must be performed atomically.

.gitignore

@@ -7,3 +7,6 @@ bazel-genfiles
 bazel-grpc-gateway
 bazel-out
 bazel-testlogs
+
+# Go vendor directory
+vendor

.travis.yml

@@ -18,6 +18,7 @@ before_install:
   - test "${USE_BAZEL}" = true || go get github.com/golang/lint/golint
   - test "${USE_BAZEL}" = true || go get github.com/dghubble/sling
   - test "${USE_BAZEL}" = true || go get github.com/go-resty/resty
+  - test "${USE_BAZEL}" = true || curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
 install:
   # Make sure externally referenced packages are go-gettable.
   - test "${USE_BAZEL}" = true ||

Gopkg.toml

@@ -0,0 +1,67 @@
+required = [
+  "github.com/golang/protobuf/protoc-gen-go",
+]
+
+[prune]
+  go-tests = true
+  unused-packages = true
+
+# Constrained versions that are defined in WORKSPACE are at the top
+
+[[constraint]]
+  # Also defined in WORKSPACE
+  revision = "0ca9ea5df5451ffdf184b4428c902747c2c11cd7"
+  name = "github.com/ghodss/yaml"
+
+[[constraint]]
+  # Also defined in WORKSPACE
+  revision = "f8815663de1e64d57cdd4ee9e2b2fa96977a030e"
+  name = "github.com/go-resty/resty"
+
+[[constraint]]
+  # Also defined in WORKSPACE
+  revision = "6724a57986aff9bff1a1770e9347036def7c89f6"
+  name = "github.com/rogpeppe/fastuuid"
+
+[[override]]
+  # Also defined in WORKSPACE
+  revision = "eb3733d160e74a9c7e442f435eb3bea458e1d19f"
+  name = "gopkg.in/yaml.v2"
+
+# These versions are constrained transitively by bazelbuilz/rules_go
+
+[[constraint]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L75
+  revision = "b4deda0973fb4c70b50d226b1af49f3da59f5265"
+  name = "github.com/golang/protobuf"
+
+[[constraint]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L110
+  revision = "640f4622ab692b87c2f3a94265e6f579fe38263d"
+  name = "golang.org/x/net"
+
+[[constraint]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L123
+  revision = "d11072e7ca9811b1100b80ca0269ac831f06d024"
+  name = "google.golang.org/grpc"
+
+[[constraint]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L131
+  revision = "86e600f69ee4704c6efbf6a2a40a5c10700e76c2"
+  name = "google.golang.org/genproto"
+
+[[constraint]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L138
+  revision = "23def4e6c14b4da8ac2ed8007337bc5eb5007998"
+  name = "github.com/golang/glog"
+
+[[override]]
+  # Also defined in bazelbuild/rules_go
+  # https://github.com/bazelbuild/rules_go/blob/436452edc29a2f1e0edc22d180fbb57c27e6d0af/go/private/repositories.bzl#L117
+  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
+  name = "golang.org/x/text"

Makefile

@@ -115,7 +115,8 @@ generate: $(RUNTIME_GO)
 .SUFFIXES: .go .proto
 
 $(GO_PLUGIN):
-	go get $(GO_PLUGIN_PKG)
+	dep ensure
+	go install ./vendor/$(GO_PLUGIN_PKG)
 	go build -o $@ $(GO_PLUGIN_PKG)
 
 $(RUNTIME_GO): $(RUNTIME_PROTO) $(GO_PLUGIN)