Disable optimizations and symbol stripping on debug builds (#6147)

Dockerfile.dapper

@@ -42,7 +42,7 @@ ARG SELINUX=true
 ENV SELINUX $SELINUX
 
 ENV DAPPER_RUN_ARGS --privileged -v k3s-cache:/go/src/github.com/k3s-io/k3s/.cache -v trivy-cache:/root/.cache/trivy
-ENV DAPPER_ENV REPO TAG DRONE_TAG IMAGE_NAME SKIP_VALIDATE SKIP_AIRGAP GCLOUD_AUTH GITHUB_TOKEN GOLANG
+ENV DAPPER_ENV REPO TAG DRONE_TAG IMAGE_NAME SKIP_VALIDATE SKIP_AIRGAP GCLOUD_AUTH GITHUB_TOKEN GOLANG DEBUG
 ENV DAPPER_SOURCE /go/src/github.com/k3s-io/k3s/
 ENV DAPPER_OUTPUT ./bin ./dist ./build/out ./build/static ./pkg/static ./pkg/deploy
 

scripts/binary_size_check.sh

@@ -24,6 +24,11 @@ fi
 CMD_NAME="dist/artifacts/k3s${BIN_SUFFIX}"
 SIZE=$(stat -c '%s' ${CMD_NAME})
 
+if [ -n "${DEBUG}" ]; then
+    echo "DEBUG is set, ignoring binary size"
+    exit 0
+fi
+
 if [ ${SIZE} -gt ${MAX_BINARY_SIZE} ]; then
   echo "k3s binary ${CMD_NAME} size ${SIZE} exceeds max acceptable size of ${MAX_BINARY_SIZE} bytes (${MAX_BINARY_MB} MiB)"
   exit 1

scripts/build

@@ -42,8 +42,12 @@ VERSIONFLAGS="
     -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Commit=${COMMIT}
     -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.buildDate=${buildDate}
 "
-LDFLAGS="
-    -w -s"
+
+if [ -n "${DEBUG}" ]; then
+  GCFLAGS="-N -l"
+else
+  LDFLAGS="-w -s"
+fi
 
 STATIC="
     -extldflags '-static -lm -ldl -lz -lpthread'
@@ -106,12 +110,12 @@ if [ ! -x ${INSTALLBIN}/cni ]; then
     WORKDIR=$TMPDIR/src/github.com/containernetworking/plugins
     git clone -b $VERSION_CNIPLUGINS https://github.com/rancher/plugins.git $WORKDIR
     cd $WORKDIR
-    GO111MODULE=off GOPATH=$TMPDIR CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o $INSTALLBIN/cni
+    GO111MODULE=off GOPATH=$TMPDIR CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o $INSTALLBIN/cni
 )
 fi
 
 echo Building k3s
-CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/k3s ./cmd/server/main.go
+CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/k3s ./cmd/server/main.go
 ln -s k3s ./bin/k3s-agent
 ln -s k3s ./bin/k3s-server
 ln -s k3s ./bin/k3s-etcd-snapshot
@@ -127,14 +131,14 @@ export GOPATH=$(pwd)/build
 echo Building containerd
 pushd ./build/src/github.com/containerd/containerd
 TAGS="${TAGS/netcgo/netgo}"
-CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd              ./cmd/containerd
-CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd-shim-runc-v2 ./cmd/containerd-shim-runc-v2
+CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd              ./cmd/containerd
+CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd-shim-runc-v2 ./cmd/containerd-shim-runc-v2
 popd
 cp -vf ./build/src/github.com/containerd/containerd/bin/* ./bin/
 
 echo Building runc
 pushd ./build/src/github.com/opencontainers/runc
 rm -f runc
-make EXTRA_LDFLAGS="-w -s" BUILDTAGS="$RUNC_TAGS" $RUNC_STATIC
+make EXTRA_FLAGS="-gcflags=\"all=${GCFLAGS}\"" EXTRA_LDFLAGS="$LDFLAGS" BUILDTAGS="$RUNC_TAGS" $RUNC_STATIC
 popd
 cp -vf ./build/src/github.com/opencontainers/runc/runc ./bin/