Makefile: support for golang debugging

Author: schuellerf

Makefile

@@ -317,6 +317,11 @@ WORKER_SRC_DEPS := $(SRC_DEPS)
 COMPOSER_SRC_DEPS := $(SRC_DEPS)
 
 GOMODARGS ?= -modfile=go.local.mod
+# gcflags "-N -l" for golang to allow debugging
+GCFLAGS ?= -gcflags=all=-N -gcflags=all=-l
+
+CONTAINER_DEPS_COMPOSER := ./containers/osbuild-composer/entrypoint.py
+CONTAINER_DEPS_WORKER := ./distribution/osbuild-worker-entrypoint.sh
 
 USE_BTRFS ?= yes
 
@@ -330,13 +335,13 @@ go.local.mod go.local.sum: $(SRC_DEPS_EXTERNAL_DIRS) go.mod $(SRC_DEPS_EXTERNAL)
 	env GOPROXY=$(GOPROXY) go mod tidy $(GOMODARGS)
 	env GOPROXY=$(GOPROXY) go mod vendor $(GOMODARGS)
 
-container_worker_built.info: go.local.mod $(WORKER_SRC_DEPS) $(DOCKERFILE_WORKER)
-	$(CONTAINER_EXECUTABLE) build -t $(DOCKER_IMAGE_WORKER) -f $(DOCKERFILE_WORKER) --build-arg GOMODARGS=$(GOMODARGS) --build-arg USE_BTRFS=$(USE_BTRFS) .
+container_worker_built.info: go.local.mod $(WORKER_SRC_DEPS) $(DOCKERFILE_WORKER) $(CONTAINER_DEPS_WORKER)
+	$(CONTAINER_EXECUTABLE) build -t $(DOCKER_IMAGE_WORKER) -f $(DOCKERFILE_WORKER) --build-arg GOMODARGS="$(GOMODARGS)"  --build-arg GCFLAGS="$(GCFLAGS)" --build-arg USE_BTRFS=$(USE_BTRFS) .
 	echo "Worker last built on" > $@
 	date >> $@
 
-container_composer_built.info: go.local.mod $(COMPOSER_SRC_DEPS) $(DOCKERFILE_COMPOSER)
-	$(CONTAINER_EXECUTABLE) build -t $(DOCKER_IMAGE_COMPOSER) -f $(DOCKERFILE_COMPOSER) --build-arg GOMODARGS=$(GOMODARGS) .
+container_composer_built.info: go.local.mod $(COMPOSER_SRC_DEPS) $(DOCKERFILE_COMPOSER) $(CONTAINER_DEPS_COMPOSER)
+	$(CONTAINER_EXECUTABLE) build -t $(DOCKER_IMAGE_COMPOSER) -f $(DOCKERFILE_COMPOSER) --build-arg GOMODARGS="$(GOMODARGS)" --build-arg GCFLAGS="$(GCFLAGS)" .
 	echo "Composer last built on" > $@
 	date >> $@
 

containers/osbuild-composer/entrypoint.py

@@ -333,12 +333,37 @@ def handler(signum, frame):
         liveness.touch()
 
         try:
-            if self.args.builtin_worker:
+            should_launch_composer = any([self.args.weldr_api, self.args.composer_api, self.args.local_worker_api, self.args.remote_worker_api])
+            if self.args.builtin_worker or not should_launch_composer:
+                if not should_launch_composer:
+                    print(f"NOTE: launching worker only - no API for composer enabled")
                 proc_worker = self._spawn_worker()
 
-            if any([self.args.weldr_api, self.args.composer_api, self.args.local_worker_api, self.args.remote_worker_api]):
+            if should_launch_composer:
                 proc_composer = self._spawn_composer(sockets)
 
+            debug_port = os.environ.get('GODEBUG_PORT')
+            debugger = None
+
+            if debug_port:
+                # only debug one - either composer or worker if there is no composer
+                child_pid = proc_composer.pid if proc_composer else proc_worker.pid
+                debug_target_name = "image-builder-composer" if proc_composer else "image-builder-worker"
+
+                debugger_cmd = [
+                    "/usr/bin/dlv",
+                    "attach",
+                    "--headless=true",
+                    "--api-version", "2",
+                    "--listen", f":{debug_port}",
+                    str(child_pid),
+                    "/usr/libexec/osbuild-composer/osbuild-composer"
+                ]
+
+                print(f"NOTE: you HAVE to attach the debugger NOW otherwise { debug_target_name } "
+                      f"will not continue running", file=sys.stderr)
+                debugger = subprocess.Popen(debugger_cmd)
+
             if proc_composer:
                 res = proc_composer.wait()
 
@@ -347,6 +372,10 @@ def handler(signum, frame):
                     proc_worker.terminate()
                 proc_worker.wait()
 
+            if debugger:
+                debugger.wait()
+
+
         except KeyboardInterrupt:
             if proc_composer:
                 proc_composer.terminate()

distribution/Dockerfile-composer

@@ -11,15 +11,16 @@ ARG GOPROXY=https://proxy.golang.org,direct
 RUN go env -w GOPROXY=$GOPROXY
 
 ARG GOMODARGS=""
+ARG GCFLAGS=""
 
-RUN go install $GOMODARGS ./cmd/osbuild-composer/
+RUN go install $GOMODARGS $GCFLAGS ./cmd/osbuild-composer/
 
 FROM registry.access.redhat.com/ubi9/go-toolset:latest AS builder2
 RUN go install github.com/jackc/tern@latest
 
 FROM fedora:39
 
-RUN dnf install -y python3 python3-dnf gpgme libassuan device-mapper-libs
+RUN dnf install -y python3 python3-dnf gpgme libassuan device-mapper-libs delve
 RUN mkdir -p "/usr/libexec/osbuild-composer"
 RUN mkdir -p "/etc/osbuild-composer/"
 RUN mkdir -p "/run/osbuild-composer/"

distribution/Dockerfile-worker_srcinstall

@@ -18,17 +18,21 @@ ARG GOPROXY=https://proxy.golang.org,direct
 RUN go env -w GOPROXY=$GOPROXY
 
 ARG GOMODARGS=""
+ARG GCFLAGS=""
 
-RUN go install $GOMODARGS ./cmd/osbuild-worker
+RUN go install $GOMODARGS $GCFLAGS ./cmd/osbuild-worker
 
 FROM osbuild_devel
 
+RUN dnf install -y delve
+
 RUN mkdir -p "/usr/libexec/osbuild-composer"
 RUN mkdir -p "/etc/osbuild-composer/"
 RUN mkdir -p "/run/osbuild-composer/"
 RUN mkdir -p "/var/cache/osbuild-worker/"
 RUN mkdir -p "/var/lib/osbuild-composer/"
 RUN mkdir -p "/var/cache/osbuild-composer/output"
 COPY --from=builder /opt/app-root/src/go/bin/osbuild-worker /usr/libexec/osbuild-composer/
+COPY distribution/osbuild-worker-entrypoint.sh /usr/libexec/osbuild-composer/
 
-ENTRYPOINT ["/usr/libexec/osbuild-composer/osbuild-worker"]
+ENTRYPOINT ["/usr/libexec/osbuild-composer/osbuild-worker-entrypoint.sh"]