package/skeleton: respect variables namespace

In makefiles, variables have global scope. We traditionally ensure that
we get no name clashing by prefixing all variables with the package
name.

Currently, this is not the case in the skeleton package, for historical
reasons (code snippets copied over from the common Makefiles). We
currently have a mix of naming for the variables:
  - some are indeed prefixed with SKELETON_
  - some are prefixed with SYSTEM_
  - some are prefixed with both
  - some are not prefixed

Clean up these discrepancies, and prefix all variables with just
SKELETON_ and drop the SYSTEM_ prefix.

Also include SET_ in all variables that do set something (getty) for
consistency across all the variables.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/skeleton/skeleton.mk

@@ -118,24 +118,24 @@ SKELETON_TARGET_GENERIC_GETTY_TERM = $(call qstrip,$(BR2_TARGET_GENERIC_GETTY_TE
 SKELETON_TARGET_GENERIC_GETTY_OPTIONS = $(call qstrip,$(BR2_TARGET_GENERIC_GETTY_OPTIONS))
 
 ifneq ($(SKELETON_TARGET_GENERIC_HOSTNAME),)
-define SYSTEM_HOSTNAME
+define SKELETON_SET_HOSTNAME
 	mkdir -p $(TARGET_DIR)/etc
 	echo "$(SKELETON_TARGET_GENERIC_HOSTNAME)" > $(TARGET_DIR)/etc/hostname
 	$(SED) '$$a \127.0.1.1\t$(SKELETON_TARGET_GENERIC_HOSTNAME)' \
 		-e '/^127.0.1.1/d' $(TARGET_DIR)/etc/hosts
 endef
-TARGET_FINALIZE_HOOKS += SYSTEM_HOSTNAME
+TARGET_FINALIZE_HOOKS += SKELETON_SET_HOSTNAME
 endif
 
 ifneq ($(SKELETON_TARGET_GENERIC_ISSUE),)
-define SYSTEM_ISSUE
+define SKELETON_SET_ISSUE
 	mkdir -p $(TARGET_DIR)/etc
 	echo "$(SKELETON_TARGET_GENERIC_ISSUE)" > $(TARGET_DIR)/etc/issue
 endef
-TARGET_FINALIZE_HOOKS += SYSTEM_ISSUE
+TARGET_FINALIZE_HOOKS += SKELETON_SET_ISSUE
 endif
 
-define SET_NETWORK_LOCALHOST
+define SKELETON_SET_NETWORK_LOCALHOST
 	( \
 		echo "# interface file auto-generated by buildroot"; \
 		echo ;                                               \
@@ -144,14 +144,14 @@ define SET_NETWORK_LOCALHOST
 	) > $(TARGET_DIR)/etc/network/interfaces
 endef
 
-NETWORK_DHCP_IFACE = $(call qstrip,$(BR2_SYSTEM_DHCP))
+SKELETON_NETWORK_DHCP_IFACE = $(call qstrip,$(BR2_SYSTEM_DHCP))
 
-ifneq ($(NETWORK_DHCP_IFACE),)
-define SET_NETWORK_DHCP
+ifneq ($(SKELETON_NETWORK_DHCP_IFACE),)
+define SKELETON_SET_NETWORK_DHCP
 	( \
 		echo ;                                               \
-		echo "auto $(NETWORK_DHCP_IFACE)";                   \
-		echo "iface $(NETWORK_DHCP_IFACE) inet dhcp";        \
+		echo "auto $(SKELETON_NETWORK_DHCP_IFACE)";                   \
+		echo "iface $(SKELETON_NETWORK_DHCP_IFACE) inet dhcp";        \
 		echo "	pre-up /etc/network/nfs_check";              \
 		echo "	wait-delay 15";                              \
 	) >> $(TARGET_DIR)/etc/network/interfaces
@@ -160,13 +160,13 @@ define SET_NETWORK_DHCP
 endef
 endif
 
-define SET_NETWORK
+define SKELETON_SET_NETWORK
 	mkdir -p $(TARGET_DIR)/etc/network/
-	$(SET_NETWORK_LOCALHOST)
-	$(SET_NETWORK_DHCP)
+	$(SKELETON_SET_NETWORK_LOCALHOST)
+	$(SKELETON_SET_NETWORK_DHCP)
 endef
 
-TARGET_FINALIZE_HOOKS += SET_NETWORK
+TARGET_FINALIZE_HOOKS += SKELETON_SET_NETWORK
 
 # The TARGET_FINALIZE_HOOKS must be sourced only if the users choose to use the
 # default skeleton.
@@ -174,66 +174,66 @@ ifeq ($(BR2_ROOTFS_SKELETON_DEFAULT),y)
 
 ifeq ($(BR2_TARGET_ENABLE_ROOT_LOGIN),y)
 ifeq ($(SKELETON_TARGET_GENERIC_ROOT_PASSWD),)
-SYSTEM_ROOT_PASSWORD =
+SKELETON_ROOT_PASSWORD =
 else ifneq ($(filter $$1$$% $$5$$% $$6$$%,$(SKELETON_TARGET_GENERIC_ROOT_PASSWD)),)
-SYSTEM_ROOT_PASSWORD = '$(SKELETON_TARGET_GENERIC_ROOT_PASSWD)'
+SKELETON_ROOT_PASSWORD = '$(SKELETON_TARGET_GENERIC_ROOT_PASSWD)'
 else
 SKELETON_DEPENDENCIES += host-mkpasswd
 # This variable will only be evaluated in the finalize stage, so we can
 # be sure that host-mkpasswd will have already been built by that time.
-SYSTEM_ROOT_PASSWORD = "`$(MKPASSWD) -m "$(SKELETON_TARGET_GENERIC_PASSWD_METHOD)" "$(SKELETON_TARGET_GENERIC_ROOT_PASSWD)"`"
+SKELETON_ROOT_PASSWORD = "`$(MKPASSWD) -m "$(SKELETON_TARGET_GENERIC_PASSWD_METHOD)" "$(SKELETON_TARGET_GENERIC_ROOT_PASSWD)"`"
 endif
 else # !BR2_TARGET_ENABLE_ROOT_LOGIN
-SYSTEM_ROOT_PASSWORD = "*"
+SKELETON_ROOT_PASSWORD = "*"
 endif
 
-define SKELETON_SYSTEM_SET_ROOT_PASSWD
-	$(SED) s,^root:[^:]*:,root:$(SYSTEM_ROOT_PASSWORD):, $(TARGET_DIR)/etc/shadow
+define SKELETON_SET_ROOT_PASSWD
+	$(SED) s,^root:[^:]*:,root:$(SKELETON_ROOT_PASSWORD):, $(TARGET_DIR)/etc/shadow
 endef
-TARGET_FINALIZE_HOOKS += SKELETON_SYSTEM_SET_ROOT_PASSWD
+TARGET_FINALIZE_HOOKS += SKELETON_SET_ROOT_PASSWD
 
 ifeq ($(BR2_SYSTEM_BIN_SH_NONE),y)
-define SKELETON_SYSTEM_BIN_SH
+define SKELETON_BIN_SH
 	rm -f $(TARGET_DIR)/bin/sh
 endef
 else
-define SKELETON_SYSTEM_BIN_SH
+define SKELETON_BIN_SH
 	ln -sf $(SKELETON_TARGET_GENERIC_BIN_SH) $(TARGET_DIR)/bin/sh
 endef
 endif
-TARGET_FINALIZE_HOOKS += SKELETON_SYSTEM_BIN_SH
+TARGET_FINALIZE_HOOKS += SKELETON_BIN_SH
 
 ifeq ($(BR2_TARGET_GENERIC_GETTY),y)
 ifeq ($(BR2_INIT_SYSV),y)
 # In sysvinit inittab, the "id" must not be longer than 4 bytes, so we
 # skip the "tty" part and keep only the remaining.
-define SKELETON_SYSTEM_GETTY
+define SKELETON_SET_GETTY
 	$(SED) '/# GENERIC_SERIAL$$/s~^.*#~$(shell echo $(SKELETON_TARGET_GENERIC_GETTY_PORT) | tail -c+4)::respawn:/sbin/getty -L $(SKELETON_TARGET_GENERIC_GETTY_OPTIONS) $(SKELETON_TARGET_GENERIC_GETTY_PORT) $(SKELETON_TARGET_GENERIC_GETTY_BAUDRATE) $(SKELETON_TARGET_GENERIC_GETTY_TERM) #~' \
 		$(TARGET_DIR)/etc/inittab
 endef
 else ifeq ($(BR2_INIT_BUSYBOX),y)
 # Add getty to busybox inittab
-define SKELETON_SYSTEM_GETTY
+define SKELETON_SET_GETTY
 	$(SED) '/# GENERIC_SERIAL$$/s~^.*#~$(SKELETON_TARGET_GENERIC_GETTY_PORT)::respawn:/sbin/getty -L $(SKELETON_TARGET_GENERIC_GETTY_OPTIONS) $(SKELETON_TARGET_GENERIC_GETTY_PORT) $(SKELETON_TARGET_GENERIC_GETTY_BAUDRATE) $(SKELETON_TARGET_GENERIC_GETTY_TERM) #~' \
 		$(TARGET_DIR)/etc/inittab
 endef
 endif
-TARGET_FINALIZE_HOOKS += SKELETON_SYSTEM_GETTY
+TARGET_FINALIZE_HOOKS += SKELETON_SET_GETTY
 endif
 
 ifeq ($(BR2_INIT_BUSYBOX)$(BR2_INIT_SYSV),y)
 ifeq ($(BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW),y)
 # Find commented line, if any, and remove leading '#'s
-define SKELETON_SYSTEM_REMOUNT_RW
+define SKELETON_REMOUNT_RW
 	$(SED) '/^#.*-o remount,rw \/$$/s~^#\+~~' $(TARGET_DIR)/etc/inittab
 endef
 else
 # Find uncommented line, if any, and add a leading '#'
-define SKELETON_SYSTEM_REMOUNT_RW
+define SKELETON_REMOUNT_RW
 	$(SED) '/^[^#].*-o remount,rw \/$$/s~^~#~' $(TARGET_DIR)/etc/inittab
 endef
 endif
-TARGET_FINALIZE_HOOKS += SKELETON_SYSTEM_REMOUNT_RW
+TARGET_FINALIZE_HOOKS += SKELETON_REMOUNT_RW
 endif # BR2_INIT_BUSYBOX || BR2_INIT_SYSV
 
 endif # BR2_ROOTFS_SKELETON_DEFAULT