feat: inject version from tags

Signed-off-by: Thibault Gagnaux <[email protected]>

Makefile

@@ -7,6 +7,7 @@ MANINSTALLDIR=${PREFIX}/share/man
 GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD 2>/dev/null)
 COMMIT_NO := $(shell git rev-parse HEAD 2> /dev/null || true)
 COMMIT := $(if $(shell git status --porcelain --untracked-files=no),"${COMMIT_NO}-dirty","${COMMIT_NO}")
+VERSION := $(shell git describe --tags --always | cut -c 2-)
 DOCKER_IMAGE := manifest-tool-dev$(if $(GIT_BRANCH),:$(GIT_BRANCH))
 # set env like gobuildtag?
 DOCKER_RUN := docker run --rm -i #$(DOCKER_ENVS)
@@ -22,17 +23,19 @@ DOCKER_RUN_DOCKER := $(DOCKER_RUN) -v $(shell pwd):/go/src/github.com/estesp/man
 all: binary
 
 build:
-	$(DOCKER_RUN) -v $(shell pwd):/go/src/github.com/estesp/manifest-tool -w /go/src/github.com/estesp/manifest-tool golang:1.17 /bin/bash -c "\
-		cd v2 && go build -ldflags \"-X main.gitCommit=${COMMIT}\" -o ../manifest-tool github.com/estesp/manifest-tool/v2/cmd/manifest-tool"
+	$(DOCKER_RUN) -v $(shell pwd):/go/src/github.com/estesp/manifest-tool -w /go/src/github.com/estesp/manifest-tool golang:1.20 /bin/bash -c "\
+		cd v2 && go build -ldflags \"-X main.gitCommit=${COMMIT} main.version=${VERSION}\" -o ../manifest-tool github.com/estesp/manifest-tool/v2/cmd/manifest-tool"
 
 # Target to build a dynamically linked binary
 binary: v2/pkg/util/oslist.go
-	cd v2 && go build -ldflags "-X main.gitCommit=${COMMIT}" -o ../manifest-tool github.com/estesp/manifest-tool/v2/cmd/manifest-tool
+	cd v2 && go build \
+		-ldflags "-X main.gitCommit=${COMMIT} -X main.version=${VERSION}" \
+		-o ../manifest-tool github.com/estesp/manifest-tool/v2/cmd/manifest-tool
 
 # Target to build a statically linked binary
 static: v2/pkg/util/oslist.go
 	cd v2 && GO_EXTLINK_ENABLED=0 CGO_ENABLED=0 go build \
-	   -ldflags "-w -extldflags -static -X main.gitCommit=${COMMIT}" \
+	   -ldflags "-w -extldflags -static -X main.gitCommit=${COMMIT} -X main.version=${VERSION}" \
 	   -tags netgo -installsuffix netgo \
 	   -o ../manifest-tool github.com/estesp/manifest-tool/v2/cmd/manifest-tool
 

v2/cmd/manifest-tool/main.go

@@ -12,9 +12,9 @@ import (
 
 // filled in at compile time
 var gitCommit = ""
+var version = ""
 
 const (
-	version = "2.1.2"
 	usage   = "registry client to inspect and push multi-platform OCI & Docker v2 images"
 )