rootlessport: exclude storage drivers via build tags

Because of a c/storage change[1] all we get a lot of new dependencies in
rootlessport despite not using them. Add build tags to exclude storage
drivers to make the binary smaller until it get addressed in c/storage.

This saves about 800 MB but the bloat due that change is still causing
us to gain over 2 MB. This is not ideal but we should get vendoring
going and not wait any longer.

[1] containers/storage#1618

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Makefile

@@ -57,6 +57,7 @@ BUILDTAGS ?= \
 	$(shell hack/libsubid_tag.sh) \
 	exclude_graphdriver_devicemapper \
 	seccomp
+ROOTLESSPORTTAGS ?= exclude_graphdriver_aufs exclude_graphdriver_btrfs exclude_graphdriver_devicemapper exclude_graphdriver_overlay exclude_graphdriver_zfs
 PYTHON ?= $(shell command -v python3 python|head -n1)
 PKG_MANAGER ?= $(shell command -v dnf yum|head -n1)
 # ~/.local/bin is not in PATH on all systems
@@ -401,6 +402,7 @@ bin/rootlessport: $(SOURCES) go.mod go.sum
 	CGO_ENABLED=$(CGO_ENABLED) \
 		$(GO) build \
 		$(BUILDFLAGS) \
+		-tags "$(ROOTLESSPORTTAGS)" \
 		-o $@ ./cmd/rootlessport
 
 .PHONY: rootlessport

rpm/podman.spec

@@ -277,6 +277,7 @@ ln -s vendor src
 LDFLAGS="-X %{import_path}/libpod/define.buildInfo=$(date +%s)"
 
 # build rootlessport first
+export BUILDTAGS="exclude_graphdriver_aufs exclude_graphdriver_btrfs exclude_graphdriver_devicemapper exclude_graphdriver_overlay exclude_graphdriver_zfs"
 %gobuild -o bin/rootlessport %{import_path}/cmd/rootlessport
 
 export BASEBUILDTAGS="seccomp exclude_graphdriver_devicemapper $(hack/systemd_tag.sh) $(hack/libsubid_tag.sh)"