Adds basic build tag support with different versions. (hashicorp#2463)

GNUmakefile

@@ -7,7 +7,7 @@ GOTOOLS = \
 PACKAGES=$(shell go list ./... | grep -v '^github.com/hashicorp/consul/vendor/')
 VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods \
          -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
-VERSION?=$(shell awk -F\" '/^const Version/ { print $$2; exit }' version.go)
+BUILD_TAGS?=consul
 
 # all builds binaries for all targets
 all: bin
@@ -20,15 +20,15 @@ ci:
 
 bin: tools
 	@mkdir -p bin/
-	@sh -c "'$(CURDIR)/scripts/build.sh'"
+	@BUILD_TAGS='$(BUILD_TAGS)' sh -c "'$(CURDIR)/scripts/build.sh'"
 
 # dev creates binaries for testing locally - these are put into ./bin and $GOPATH
 dev: format
-	@CONSUL_DEV=1 sh -c "'$(CURDIR)/scripts/build.sh'"
+	@CONSUL_DEV=1 BUILD_TAGS='$(BUILD_TAGS)' sh -c "'$(CURDIR)/scripts/build.sh'"
 
 # dist builds binaries for all platforms and packages them for distribution
 dist:
-	@sh -c "'$(CURDIR)/scripts/dist.sh' $(VERSION)"
+	@BUILD_TAGS='$(BUILD_TAGS)' sh -c "'$(CURDIR)/scripts/dist.sh'"
 
 cov:
 	gocov test ./... | gocov-html > /tmp/coverage.html
@@ -37,7 +37,7 @@ cov:
 test: format
 	@$(MAKE) vet
 	@./scripts/verify_no_uuid.sh
-	@./scripts/test.sh
+	@BUILD_TAGS='$(BUILD_TAGS)' sh -c "'$(CURDIR)/scripts/test.sh'"
 
 cover:
 	go list ./... | xargs -n1 go test --cover
@@ -49,7 +49,7 @@ format:
 vet:
 	@echo "--> Running go tool vet $(VETARGS) ."
 	@go list ./... \
-		| grep -v ^github.com/hashicorp/consul/vendor/ \
+		| grep -v /vendor/ \
 		| cut -d '/' -f 4- \
 		| xargs -n1 \
 			go tool vet $(VETARGS) ;\

commands.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/hashicorp/consul/command"
 	"github.com/hashicorp/consul/command/agent"
+	"github.com/hashicorp/consul/version"
 	"github.com/mitchellh/cli"
 )
 
@@ -19,10 +20,10 @@ func init() {
 	Commands = map[string]cli.CommandFactory{
 		"agent": func() (cli.Command, error) {
 			return &agent.Command{
-				Revision:          GitCommit,
-				Version:           Version,
-				VersionPrerelease: VersionPrerelease,
-				HumanVersion:      GetHumanVersion(),
+				Revision:          version.GitCommit,
+				Version:           version.Version,
+				VersionPrerelease: version.VersionPrerelease,
+				HumanVersion:      version.GetHumanVersion(),
 				Ui:                ui,
 				ShutdownCh:        make(chan struct{}),
 			}, nil
@@ -177,7 +178,7 @@ func init() {
 
 		"version": func() (cli.Command, error) {
 			return &command.VersionCommand{
-				HumanVersion: GetHumanVersion(),
+				HumanVersion: version.GetHumanVersion(),
 				Ui:           ui,
 			}, nil
 		},

scripts/build.sh

@@ -3,7 +3,6 @@
 # This script builds the application from source for multiple platforms.
 set -e
 
-export GO15VENDOREXPERIMENT=1
 export CGO_ENABLED=0
 
 # Get the parent directory of where this script is.
@@ -43,6 +42,7 @@ echo "==> Building..."
     -osarch="!darwin/arm" \
     -ldflags "-X main.GitCommit='${GIT_COMMIT}${GIT_DIRTY}' -X main.GitDescribe='${GIT_DESCRIBE}'" \
     -output "pkg/{{.OS}}_{{.Arch}}/consul" \
+    -tags="${BUILD_TAGS}" \
     .
 
 # Move all the compiled things to the $GOPATH/bin

scripts/dist.sh

@@ -1,14 +1,22 @@
 #!/usr/bin/env bash
 set -e
 
-export GO15VENDOREXPERIMENT=1
-
-# Get the version from the command line.
-VERSION=$1
+# Get the version from the environment, or try to figure it out from the build tags.
+# We process the files in the same order Go does to find the last matching tag.
+if [ -z $VERSION ]; then
+    for file in $(ls version/version_*.go | sort); do
+        for tag in "$BUILD_TAGS"; do
+            if grep -q "// +build $tag" $file; then
+                VERSION=$(awk -F\" '/Version =/ { print $2; exit }' <$file)
+            fi
+        done
+    done
+fi
 if [ -z $VERSION ]; then
-    echo "Please specify a version."
+    echo "Please specify a version (couldn't find one based on build tags)."
     exit 1
 fi
+echo "==> Building version $VERSION..."
 
 # Get the parent directory of where this script is.
 SOURCE="${BASH_SOURCE[0]}"
@@ -28,7 +36,7 @@ fi
 # Do a hermetic build inside a Docker container.
 if [ -z $NOBUILD ]; then
     docker build -t hashicorp/consul-builder scripts/consul-builder/
-    docker run --rm -v "$(pwd)":/gopath/src/github.com/hashicorp/consul hashicorp/consul-builder ./scripts/dist_build.sh
+    docker run --rm -e "BUILD_TAGS=$BUILD_TAGS" -v "$(pwd)":/gopath/src/github.com/hashicorp/consul hashicorp/consul-builder ./scripts/dist_build.sh
 fi
 
 # Zip all the files.

scripts/dist_build.sh

@@ -1,8 +1,6 @@
 #!/usr/bin/env bash
 set -e
 
-export GO15VENDOREXPERIMENT=1
-
 # Get the parent directory of where this script is.
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
@@ -12,7 +10,7 @@ DIR="$( cd -P "$( dirname "$SOURCE" )/.." && pwd )"
 cd $DIR
 
 # Make sure build tools are abailable.
-make -f GNUMakefile tools
+make tools
 
 # Build the standalone version of the web assets for the sanity check.
 pushd ui
@@ -29,7 +27,7 @@ popd
 
 # Regenerate the built-in web assets. If there are any diffs after doing this
 # then we know something is up.
-make -f GNUMakefile static-assets
+make static-assets
 if ! git diff --quiet command/agent/bindata_assetfs.go; then
    echo "Checked-in web assets are out of date, build aborted"
    exit 1
@@ -39,7 +37,7 @@ fi
 # away our pkg folder so we have to regenerate the ui once more. This is probably
 # for the best since we have meddled with the timestamps.
 rm -rf pkg
-make -f GNUMakefile all
+make all
 pushd ui
 make dist
 popd

scripts/test.sh

@@ -1,15 +1,14 @@
 #!/usr/bin/env bash
-
-export GO15VENDOREXPERIMENT=1
+set -e
 
 # Create a temp dir and clean it up on exit
 TEMPDIR=`mktemp -d -t consul-test.XXX`
 trap "rm -rf $TEMPDIR" EXIT HUP INT QUIT TERM
 
 # Build the Consul binary for the API tests
 echo "--> Building consul"
-go build -o $TEMPDIR/consul || exit 1
+go build -tags="${BUILD_TAGS}" -o $TEMPDIR/consul || exit 1
 
 # Run the tests
 echo "--> Running tests"
-go list ./... | grep -v '^github.com/hashicorp/consul/vendor/' | PATH=$TEMPDIR:$PATH xargs -n1 go test ${GOTEST_FLAGS:--cover -timeout=360s}
+go list ./... | grep -v '^/vendor/' | PATH=$TEMPDIR:$PATH xargs -n1 go test -tags="${BUILD_TAGS}" ${GOTEST_FLAGS:--cover -timeout=360s}

version.go → version/version.go

@@ -1,23 +1,21 @@
-package main
+package version
 
 import (
 	"fmt"
 	"strings"
 )
 
-// The git commit that was compiled. This will be filled in by the compiler.
 var (
+	// The git commit that was compiled. These will be filled in by the
+	// compiler.
 	GitCommit   string
 	GitDescribe string
-)
-
-// The main version number that is being run at the moment.
-const Version = "0.7.1"
 
-// A pre-release marker for the version. If this is "" (empty string)
-// then it means that it is a final release. Otherwise, this is a pre-release
-// such as "dev" (in development), "beta", "rc1", etc.
-const VersionPrerelease = "dev"
+	// Release versions of the build. These will be filled in by one of the
+	// build tag-specific files.
+	Version           = "unknown"
+	VersionPrerelease = "unknown"
+)
 
 // GetHumanVersion composes the parts of the version in a way that's suitable
 // for displaying to humans.

version/version_base.go

@@ -0,0 +1,16 @@
+// +build consul
+
+package version
+
+// NOTE we rely on other "version_*.go" files to be lexically after
+// "version_base.go" in order for this to get properly overridden. Be careful
+// adding new versions and pick a name that will follow "version_base.go".
+func init() {
+	// The main version number that is being run at the moment.
+	Version = "0.7.1"
+
+	// A pre-release marker for the version. If this is "" (empty string)
+	// then it means that it is a final release. Otherwise, this is a pre-release
+	// such as "dev" (in development), "beta", "rc1", etc.
+	VersionPrerelease = "dev"
+}