Allow running cpio and uncpio with sudo

Author: gsingh93

Makefile

@@ -243,6 +243,9 @@ ROOTFS_FORMAT ?= qcow2
 ROOTFS_DIR ?= $(ROOTFS_PARENT_DIR)/alpine-$(ARCH)
 CPIO_FILE ?= $(ROOTFS_PARENT_DIR)/$$(basename $(ROOTFS_DIR)).cpio.gz
 EXT4_SIZE ?= 1G
+ifeq ($(SUDO),1)
+	SUDO := sudo
+endif
 
 # The user might set a relative path for `CPIO_FILE`, so we need to get the
 # absolute path, as we need to reference it after we've changed directories
@@ -271,13 +274,13 @@ ext4: | $(ROOTFS_DIR)
 
 .PHONY: cpio initramfs
 initramfs cpio: | $(ROOTFS_DIR)
-	(cd $(ROOTFS_DIR) && find . -print0 \
-		| cpio --null --create --verbose --format=newc) \
+	(cd $(ROOTFS_DIR) && $(SUDO) find . -print0 \
+		| $(SUDO) cpio --null --create --verbose --format=newc) \
 		| gzip --best > $(CPIO_FILE)
 
 .PHONY: uncpio
 uncpio: | $(ROOTFS_DIR)
-	cd $(ROOTFS_DIR) && zcat $(CPIO_FILE) | cpio --extract --make-directories --format=newc --no-absolute-filenames
+	cd $(ROOTFS_DIR) && zcat $(CPIO_FILE) | $(SUDO) cpio --extract --make-directories --format=newc --no-absolute-filenames
 
 .PHONY: rootfs
 rootfs: ext4 cpio