chore: propagate build info to Go binary in Docker image

.github/workflows/docker.yaml

@@ -31,6 +31,18 @@ jobs:
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
         with:
           images: ctferio/ctfd-setup
+
+      - name: Git commit date
+        id: infos
+        run: |
+          # trim version prefix
+          version=${{ github.ref_name }}
+          version="${version#"v"}"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+
+          # output date per RFC 3339
+          date="$(git log -1 --format=%cd --date=format:%Y-%m-%dT%H:%M:%SZ)"
+          echo "date=$date" >> "$GITHUB_OUTPUT"
 
       - name: Build and push Docker image
         uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6.9.0
@@ -40,6 +52,14 @@ jobs:
           sbom: true # may not produce SBOM in manifest if the image has no filesystem (e.g. "FROM scratch")
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=$VERSION
+            COMMIT=$COMMIT
+            COMMIT_DATE=$COMMIT_DATE
+        env:
+          VERSION: ${{ steps.infos.outputs.version }}
+          COMMIT: ${{ github.sha }}
+          COMMIT_DATE: ${{ steps.infos.outputs.date }}
 
   # This step calls the container workflow to generate provenance and push it to
   # the container registry.

.github/workflows/release.yaml

@@ -37,7 +37,6 @@ jobs:
           args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          VERSION_LDFLAGS: ${{ steps.ldflags.outputs.version }}
 
       - name: Generate subject
         id: hash

Dockerfile

@@ -7,7 +7,13 @@ RUN go mod download
 COPY . .
 
 ENV CGO_ENABLED=0
-RUN go build -cover -o /go/bin/ctfd-setup cmd/ctfd-setup/main.go
+ARG VERSION="dev"
+ARG COMMIT
+ARG COMMIT_DATE
+RUN go build -cover \
+    -ldflags="-s -w -X 'main.Version="$VERSION"' -X 'main.Commit="$COMMIT"' -X 'main.CommitDate="$COMMIT_DATE"'" \
+    -o /go/bin/ctfd-setup \
+    cmd/ctfd-setup/main.go
 
 
 

cmd/ctfd-setup/main.go

@@ -18,7 +18,6 @@ var (
 	Version    = "dev"
 	Commit     = ""
 	CommitDate = ""
-	TreeState  = ""
 )
 
 const (
@@ -437,10 +436,9 @@ func main() {
 		},
 		Version: Version,
 		Metadata: map[string]any{
-			"version":   Version,
-			"commit":    Commit,
-			"date":      CommitDate,
-			"treeState": TreeState,
+			"version": Version,
+			"commit":  Commit,
+			"date":    CommitDate,
 		},
 	}