maintner/maintnerd: change Dockerfile to FROM scratch

Before:
REPOSITORY                            SIZE
gcr.io/go-dashboard-dev/maintnerd     786MB

After:
REPOSITORY                            SIZE
gcr.io/go-dashboard-dev/maintnerd     8.85MB

Updates golang/go#18817
Updates golang/go#19866

Change-Id: Ibfdadbaf043e44b26d5807c1da45746e934a7dce
Reviewed-on: https://go-review.googlesource.com/40572
Reviewed-by: Kevin Burke <[email protected]>

maintner/maintnerd/.gitignore

@@ -0,0 +1,2 @@
+maintnerd
+ca-certificates.crt

maintner/maintnerd/Dockerfile

@@ -1,35 +1,9 @@
 # Copyright 2017 The Go Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
-FROM golang:1.8
+FROM scratch
 LABEL maintainer "[email protected]"
 
-# TODO (jessfraz): change this, gitmirror, and coordinator to have minimal
-# builds with a nested build Dockerfile/Makefile
-
-RUN go get -d golang.org/x/oauth2
-RUN cd /go/src/golang.org/x/oauth2 && git reset --hard 314dd2c0bf3ebd592ec0d20847d27e79d0dbe8dd
-
-RUN go get -d golang.org/x/net/context
-RUN cd /go/src/golang.org/x/net && git reset --hard f2499483f923065a842d38eb4c7f1927e6fc6e6d
-
-RUN go get -d github.com/google/go-github/github
-RUN cd /go/src/github.com/google/go-github && git reset --hard 6896997c7c9fe603fb9d2e8e92303bb18481e60a
-
-RUN go get -d github.com/gregjones/httpcache
-RUN cd /go/src/github.com/gregjones/httpcache && git reset --hard d02018f006d98f58512bf3adfc171d88d17626df
-
-RUN go get -d go4.org/types
-RUN cd /go/src/go4.org && git reset --hard 7ce08ca145dbe0e66a127c447b80ee7914f3e4f9
-
-RUN go get -d golang.org/x/sync/errgroup
-RUN cd /go/src/golang.org/x/sync && git reset --hard 5a06fca2c336a4b2b2fcb45702e8c47621b2aa2c
-
-RUN go get -d github.com/golang/protobuf/proto
-RUN cd /go/src/github.com/golang/protobuf && git reset --hard 2bba0603135d7d7f5cb73b2125beeda19c09f4ef
-
-COPY . /go/src/golang.org/x/build/
-
-RUN go install golang.org/x/build/maintner/maintnerd
-
-ENTRYPOINT ["/go/bin/maintnerd"]
+COPY ca-certificates.crt /etc/ssl/certs/
+COPY maintnerd /
+ENTRYPOINT ["/maintnerd"]

maintner/maintnerd/Dockerfile.0

@@ -0,0 +1,30 @@
+# Copyright 2017 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+FROM golang:1.8
+LABEL maintainer "[email protected]"
+
+RUN go get -d golang.org/x/oauth2
+RUN cd /go/src/golang.org/x/oauth2 && git reset --hard 314dd2c0bf3ebd592ec0d20847d27e79d0dbe8dd
+
+RUN go get -d golang.org/x/net/context
+RUN cd /go/src/golang.org/x/net && git reset --hard f2499483f923065a842d38eb4c7f1927e6fc6e6d
+
+RUN go get -d github.com/google/go-github/github
+RUN cd /go/src/github.com/google/go-github && git reset --hard 6896997c7c9fe603fb9d2e8e92303bb18481e60a
+
+RUN go get -d github.com/gregjones/httpcache
+RUN cd /go/src/github.com/gregjones/httpcache && git reset --hard d02018f006d98f58512bf3adfc171d88d17626df
+
+RUN go get -d go4.org/types
+RUN cd /go/src/go4.org && git reset --hard 7ce08ca145dbe0e66a127c447b80ee7914f3e4f9
+
+RUN go get -d golang.org/x/sync/errgroup
+RUN cd /go/src/golang.org/x/sync && git reset --hard 5a06fca2c336a4b2b2fcb45702e8c47621b2aa2c
+
+RUN go get -d github.com/golang/protobuf/proto
+RUN cd /go/src/github.com/golang/protobuf && git reset --hard 2bba0603135d7d7f5cb73b2125beeda19c09f4ef
+
+COPY . /go/src/golang.org/x/build/
+
+RUN go install -ldflags "-linkmode=external -extldflags '-static -pthread'" golang.org/x/build/maintner/maintnerd

maintner/maintnerd/Makefile

@@ -2,14 +2,34 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-VERSION=v1
+VERSION=v2
+DOCKER_IMAGE_build0=build0/maintnerd:latest
+DOCKER_CTR_build0=maintnerd-build0
 
-docker-prod: Dockerfile
-	docker build -f Dockerfile --tag=gcr.io/symbolic-datum-552/maintnerd:$(VERSION)  ../..
-docker-dev: Dockerfile
-	docker build -f Dockerfile --tag=gcr.io/go-dashboard-dev/maintnerd:latest  ../..
+build0: *.go Dockerfile.0
+	docker build --force-rm -f Dockerfile.0 --tag=$(DOCKER_IMAGE_build0) ../..
+
+maintnerd: build0
+	docker create --name $(DOCKER_CTR_build0) $(DOCKER_IMAGE_build0)
+	docker cp $(DOCKER_CTR_build0):/go/bin/$@ $@
+	docker rm $(DOCKER_CTR_build0)
+
+ca-certificates.crt:
+	docker create --name $(DOCKER_CTR_build0) $(DOCKER_IMAGE_build0)
+	docker cp $(DOCKER_CTR_build0):/etc/ssl/certs/$@ $@
+	docker rm $(DOCKER_CTR_build0)
+
+docker-prod: Dockerfile maintnerd ca-certificates.crt
+	docker build --force-rm --tag=gcr.io/symbolic-datum-552/maintnerd:$(VERSION) .
+docker-dev: Dockerfile maintnerd ca-certificates.crt
+	docker build --force-rm --tag=gcr.io/go-dashboard-dev/maintnerd:latest .
 
 push-prod: docker-prod
 	gcloud docker -- push gcr.io/symbolic-datum-552/maintnerd:$(VERSION)
 push-dev: docker-dev
 	gcloud docker -- push gcr.io/go-dashboard-dev/maintnerd:latest
+
+.PHONY: clean
+clean:
+	$(RM) maintnerd
+	$(RM) ca-certificates.crt