secretservice: add D-Bus secret service

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

Makefile

@@ -1,4 +1,6 @@
-.PHONY: all deps osxkeychain test validate wincred
+.PHONY: all deps osxkeychain secretservice test validate wincred
+
+TRAVIS_OS_NAME ?= linux
 
 all: test
 
@@ -9,15 +11,29 @@ osxkeychain:
 	mkdir -p bin
 	go build -o bin/docker-credential-osxkeychain osxkeychain/cmd/main_darwin.go
 
-test:
-	# tests all packages except vendor
-	go test -v `go list ./... | grep -v /vendor/`
-
-validate:
-	go vet ./credentials ./osxkeychain
-	golint `go list ./... | grep -v /vendor/`
-	gofmt -s -l `ls **/*.go | grep -v vendor`
+secretservice:
+	mkdir -p bin
+	go build -o bin/docker-credential-secretservice secretservice/cmd/main_linux.go
 
 wincred:
 	mkdir -p bin
 	go build -o bin/docker-credential-wincred wincred/cmd/main_windows.go
+
+test:
+	# tests all packages except vendor
+	go test -v `go list ./... | grep -v /vendor/`
+
+vet: vet_$(TRAVIS_OS_NAME)
+	go vet ./credentials
+
+vet_osx:
+	go vet ./osxkeychain
+
+vet_linux:
+	go vet ./secretservice
+
+validate: vet
+	for p in `go list ./... | grep -v /vendor/`; do \
+		golint $$p ; \
+	done
+	gofmt -s -l `ls **/*.go | grep -v vendor`