Makefile: fulfill version

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

Makefile

@@ -1,6 +1,13 @@
 .DEFAULT_GOAL := binary
 
-GO := go
+GO ?= go
+
+PACKAGE := github.com/lima-vm/sshocker
+
+VERSION=$(shell git describe --match 'v[0-9]*' --dirty='.m' --always --tags)
+VERSION_TRIMMED := $(VERSION:v%=%)
+
+GO_BUILD := CGO_ENABLED=0 $(GO) build -ldflags="-s -w -X $(PACKAGE)/pkg/version.Version=$(VERSION)"
 
 binary: bin/sshocker
 
@@ -11,14 +18,15 @@ uninstall:
 	rm -f /usr/local/bin/sshocker
 
 bin/sshocker:
-	CGO_ENABLED=0 $(GO) build -o $@ ./cmd/sshocker
+	$(GO_BUILD) -o $@ ./cmd/sshocker
 	if [ $(shell go env GOOS) = linux ]; then LANG=C LC_ALL=C file $@ | grep -qw "statically linked"; fi
 
 # The file name convention for Unix: ./bin/sshocker-$(uname -s)-$(uname -m)
 cross:
-	CGO_ENABLED=0 GOOS=linux     GOARCH=amd64 $(GO) build -o ./bin/sshocker-Linux-x86_64     ./cmd/sshocker
-	CGO_ENABLED=0 GOOS=linux     GOARCH=arm64 $(GO) build -o ./bin/sshocker-Linux-aarch64    ./cmd/sshocker
-	CGO_ENABLED=0 GOOS=darwin    GOARCH=amd64 $(GO) build -o ./bin/sshocker-Darwin-x86_64    ./cmd/sshocker
+	GOOS=linux     GOARCH=amd64 $(GO_BUILD) -o ./bin/sshocker-Linux-x86_64  ./cmd/sshocker
+	GOOS=linux     GOARCH=arm64 $(GO_BUILD) -o ./bin/sshocker-Linux-aarch64 ./cmd/sshocker
+	GOOS=darwin    GOARCH=amd64 $(GO_BUILD) -o ./bin/sshocker-Darwin-x86_64 ./cmd/sshocker
+	GOOS=darwin    GOARCH=arm64 $(GO_BUILD) -o ./bin/sshocker-Darwin-arm64  ./cmd/sshocker
 
 clean:
 	rm -rf bin

README.md

@@ -20,7 +20,8 @@ chmod +x sshocker
 
 To compile from source:
 ```console
-go get github.com/lima-vm/sshocker/cmd/sshocker
+make
+sudo make install
 ```
 
 Tested on macOS client and Linux server. May not work on other environments, especially on Windows.

pkg/version/version.go

@@ -1,3 +1,6 @@
 package version
 
-const Version = "0.1.0+dev"
+var (
+	// Version is filled on compilation time
+	Version = "<unknown>"
+)