add ldflags back (sigstore#944)

Signed-off-by: cpanato <ctadeu@gmail.com>

Author: cpanato

Makefile

@@ -30,6 +30,18 @@ RUNTIME_IMAGE ?= gcr.io/distroless/static
 # Set version variables for LDFLAGS
 GIT_VERSION ?= $(shell git describe --tags --always --dirty)
 GIT_HASH ?= $(shell git rev-parse HEAD)
+DATE_FMT = +%Y-%m-%dT%H:%M:%SZ
+SOURCE_DATE_EPOCH ?= $(shell git log -1 --pretty=%ct)
+ifdef SOURCE_DATE_EPOCH
+    BUILD_DATE ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" "$(DATE_FMT)" 2>/dev/null || date -u "$(DATE_FMT)")
+else
+    BUILD_DATE ?= $(shell date "$(DATE_FMT)")
+endif
+GIT_TREESTATE = "clean"
+DIFF = $(shell git diff --quiet >/dev/null 2>&1; if [ $$? -eq 1 ]; then echo "1"; fi)
+ifeq ($(DIFF), 1)
+    GIT_TREESTATE = "dirty"
+endif
 
 KO_PREFIX ?= gcr.io/projectsigstore
 export KO_DOCKER_REPO=$(KO_PREFIX)
@@ -41,7 +53,10 @@ GOBIN ?= $(shell go env GOPATH)/bin
 SWAGGER := $(TOOLS_BIN_DIR)/swagger
 GO-FUZZ-BUILD := $(TOOLS_BIN_DIR)/go-fuzz-build
 
-REKOR_LDFLAGS=-X sigs.k8s.io/release-utils/version.gitVersion=$(GIT_VERSION)
+REKOR_LDFLAGS=-X sigs.k8s.io/release-utils/version.gitVersion=$(GIT_VERSION) \
+              -X sigs.k8s.io/release-utils/version.gitCommit=$(GIT_HASH) \
+              -X sigs.k8s.io/release-utils/version.gitTreeState=$(GIT_TREESTATE) \
+              -X sigs.k8s.io/release-utils/version.buildDate=$(BUILD_DATE)
 
 CLI_LDFLAGS=$(REKOR_LDFLAGS)
 SERVER_LDFLAGS=$(REKOR_LDFLAGS)