Add support to disable features with command line argument

The newly added command line argument `--disable-feature` supports removing feature dependencies normally added to an image.

Closes: #17
Signed-off-by: Tobias Wolf <[email protected]>

Author: NotTheEvilOne

build

@@ -19,6 +19,7 @@ container_run_opts=(
 )
 
 container_cmd=()
+features_disabled=()
 
 use_kms=0
 resolve_cname=0
@@ -37,6 +38,10 @@ while [ $# -gt 0 ]; do
 			declare -a "container_run_opts=($2)"
 			shift 2
 			;;
+		--disable-feature)
+			features_disabled+=("$2")
+			shift 2
+			;;
 		--privileged)
 			container_run_opts+=(--privileged)
 			container_cmd=(--second-stage)
@@ -87,7 +92,6 @@ commit="$(./get_commit)"
 timestamp="$(./get_timestamp)"
 default_version="$(./get_version)"
 
-
 if [ "$resolve_cname" = 1 ]; then
 	arch="$("$container_engine" run --rm "${container_run_opts[@]}" "${container_mount_opts[@]}" "$container_image" dpkg --print-architecture)"
 	cname="$("$container_engine" run --rm "${container_run_opts[@]}" "${container_mount_opts[@]}" "$container_image" /builder/parse_features --feature-dir /builder/features --default-arch "$arch" --default-version "$default_version" --cname "$1")"
@@ -101,6 +105,7 @@ make_opts=(
 	COMMIT="$commit"
 	TIMESTAMP="$timestamp"
 	DEFAULT_VERSION="$default_version"
+	FEATURES_DISABLED=$(IFS="," ; echo "${features_disabled[*]}")
 )
 
 if [ "$use_kms" = 1 ]; then

builder/Makefile

@@ -24,6 +24,7 @@ endef
 required_vars := REPO COMMIT TIMESTAMP DEFAULT_VERSION TEMPFS_SIZE
 $(foreach var,$(required_vars),$(eval $(call require_var,$(var))))
 
+FEATURES_DISABLED ?= ''
 SHORT_COMMIT := $(shell head -c 8 <<< '$(COMMIT)')
 
 NATIVE_ARCH := $(shell dpkg --print-architecture)
@@ -54,7 +55,7 @@ clean:
 .build/%-$(SHORT_COMMIT).tar: .build/bootstrap-$$(call cname_arch,$$*)-$$(call cname_version,$$*)-$(SHORT_COMMIT).tar .build/native_bin-$$(call cname_version,$$*)-$(SHORT_COMMIT).tar $(shell ./make_directory_sentinel features) $(shell ./make_directory_sentinel cert)
 	target '$@' '$<'
 	info 'configuring rootfs $*-$(SHORT_COMMIT)'
-	features="$$(./parse_features --feature-dir features --cname '$*' features)"
+	features="$$(./parse_features --feature-dir features --ignore '$(FEATURES_DISABLED)' --cname '$*' features)"
 	BUILDER_CNAME='$*'
 	BUILDER_VERSION='$(call cname_version,$*)'
 	BUILDER_ARCH='$(call cname_arch,$*)'