Go code checks can be run locally in container

Before the only option was to spin up a VM to run code checks, which is
expensive in terms of time.

Add Dockerfile-check to provide a container build for a runtime
environment that supports go tool vet, gofmt, and golint

Add script 'code_checks.sh' intended to be run inside the
Dockerfile-check container that runs 'go tool vet', 'gofmt',
misspell, and 'golint' against packages directories passed in.  This
script runs the checks in a different order than the Makefile, to deal
with the more severe issues first, and deal with pretty print
formatting last.

Makefile updated to build the docker container and run it against the
go pakages for netplugin.

Drive-by:
* Fix comment in Dockerfile
* http_proxy and https_proxy are not useful as args when not
referenced
* add GOPATH environment var to Dockerfile for general use

Signed-off-by: Chris Plock <chrisplo@cisco.com>

Dockerfile

@@ -26,9 +26,8 @@ FROM golang:1.7.6
 # a proxy.
 #ENV http_proxy ""
 #ENV https_proxy ""
-ARG http_proxy
-ARG https_proxy
 
+ENV GOPATH=/go
 WORKDIR /go/src/github.com/contiv/netplugin/
 
 ENTRYPOINT ["netplugin"]

Dockerfile-check

@@ -0,0 +1,15 @@
+ARG TAG=latest
+
+FROM golang:1.7.6
+
+ENV GOPATH=/go
+
+WORKDIR /go/src/github.com/contiv/netplugin/
+ENTRYPOINT ["/code_checks.sh"]
+
+RUN go get github.com/tools/godep github.com/aktau/github-release \
+           github.com/contiv/modelgen \
+    && go get -u github.com/golang/lint/golint \
+                 github.com/client9/misspell/cmd/misspell
+
+COPY scripts/code_checks.sh /

Makefile

@@ -16,6 +16,8 @@ NAME := netplugin
 VERSION_FILE := $(NAME)-version
 VERSION := `cat $(VERSION_FILE)`
 TAR_EXT := tar.bz2
+# BUILD_VERSION=1.2 make --> 1.2-1097d2a7, otherwise devbuild-1097d2a7
+export NETPLUGIN_CONTAINER_TAG := $(or $(BUILD_VERSION),devbuild)-$(shell ./scripts/getGitCommit.sh)
 TAR_FILENAME := $(NAME)-$(VERSION).$(TAR_EXT)
 TAR_LOC := .
 TAR_FILE := $(TAR_LOC)/$(TAR_FILENAME)
@@ -87,6 +89,12 @@ endif
 
 checks: go-version gofmt-src golint-src govet-src misspell-src
 
+checks-with-docker: compile-with-docker
+	docker build -f Dockerfile-check -t contiv/netplugin-checks .
+	docker run --rm --name netplugin-checks \
+		-v ${PWD}:/go/src/github.com/contiv/netplugin/ \
+		contiv/netplugin-checks $(PKG_DIRS)
+
 compile:
 	cd $(GOPATH)/src/github.com/contiv/netplugin && \
 	NIGHTLY_RELEASE=${NIGHTLY_RELEASE} BUILD_VERSION=${BUILD_VERSION} \
@@ -100,7 +108,7 @@ compile-with-docker:
 	docker build \
 		--build-arg NIGHTLY_RELEASE=${NIGHTLY_RELEASE} \
 		--build-arg BUILD_VERSION=${BUILD_VERSION} \
-		-t netplugin:$${BUILD_VERSION:-devbuild}-$$(./scripts/getGitCommit.sh) .
+		-t netplugin-build:$${BUILD_VERSION:-devbuild}-$$(./scripts/getGitCommit.sh) .
 
 build-docker-image: start
 	vagrant ssh netplugin-node1 -c 'bash -lc "source /etc/profile.d/envvar.sh && cd /opt/gopath/src/github.com/contiv/netplugin && make host-build-docker-image"'

scripts/code_checks.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -euo pipefail
+
+PKG_DIRS=$*
+
+############# CORRECTNESS CHECKING #########
+echo -e "\nChecking correctness for $PKG_DIRS ...\n"
+go tool vet $PKG_DIRS
+
+############# LINT CHECKING ################
+echo -e "\nChecking lint for $PKG_DIRS ...\n"
+golint -set_exit_status $PKG_DIRS
+
+############# FORMAT CHECKING #############
+echo -e "\nChecking format for $PKG_DIRS ...\n"
+gofmt -s -d $PKG_DIRS
+
+misspell -locale US -error $PKG_DIRS