buildrootschalter/fs/common.mk
Arnout Vandecappelle (Essensium/Mind) 847895d295 fs/common.mk: delay evaluation of variables
This makes things easier to understand and more consistent with the pkg-infra.
For example, it removes the need for '$$@' in the CMD variables of fs/*/*.mk.

It also makes it possible to update the variables later, e.g. in the package
override file.

It also makes sure that the date will be recorded correctly in Yann E. Morin's
patch that logs the MESSAGE macros to a file.

The fs/*/*.mk must be updated as well because the '$@' shouldn't be quoted
anymore in the CMD variables or the hooks.

The $(eval ...) for the dependencies is redundant, because the $(ROOTFS_TARGET)
variable is already eval'd. Note that it is only redundant if the evaluation of
the uses of the variable is also delayed.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
2013-01-20 20:53:29 +01:00

89 lines
3.2 KiB
Makefile

#
# Macro that builds the needed Makefile target to create a root
# filesystem image.
#
# The following variable must be defined before calling this macro
#
# ROOTFS_$(FSTYPE)_CMD, the command that generates the root
# filesystem image. A single command is allowed. The filename of the
# filesystem image that it must generate is $$@.
#
# The following variables can optionaly be defined
#
# ROOTFS_$(FSTYPE)_DEPENDENCIES, the list of dependencies needed to
# build the root filesystem (usually host tools)
#
# ROOTFS_$(FSTYPE)_PRE_GEN_HOOKS, a list of hooks to call before
# generating the filesystem image
#
# ROOTFS_$(FSTYPE)_POST_GEN_HOOKS, a list of hooks to call after
# generating the filesystem image
#
# ROOTFS_$(FSTYPE)_POST_TARGETS, the list of targets that should be
# run after running the main filesystem target. This is useful for
# initramfs, to rebuild the kernel once the initramfs is generated.
#
# In terms of configuration option, this macro assumes that the
# BR2_TARGET_ROOTFS_$(FSTYPE) config option allows to enable/disable
# the generation of a filesystem image of a particular type. If
# configura options BR2_TARGET_ROOTFS_$(FSTYPE)_GZIP,
# BR2_TARGET_ROOTFS_$(FSTYPE)_BZIP2 or
# BR2_TARGET_ROOTFS_$(FSTYPE)_LZMA exist and are enabled, then the
# macro will automatically generate a compressed filesystem image.
FAKEROOT_SCRIPT = $(BUILD_DIR)/_fakeroot.fs
FULL_DEVICE_TABLE = $(BUILD_DIR)/_device_table.txt
ROOTFS_DEVICE_TABLES = $(call qstrip,$(BR2_ROOTFS_DEVICE_TABLE)) \
$(call qstrip,$(BR2_ROOTFS_STATIC_DEVICE_TABLE))
define ROOTFS_TARGET_INTERNAL
# extra deps
ROOTFS_$(2)_DEPENDENCIES += host-fakeroot host-makedevs $$(if $$(BR2_TARGET_ROOTFS_$(2)_LZMA),host-lzma)
$$(BINARIES_DIR)/rootfs.$(1): $$(ROOTFS_$(2)_DEPENDENCIES)
@$$(call MESSAGE,"Generating root filesystem image rootfs.$(1)")
$$(foreach hook,$$(ROOTFS_$(2)_PRE_GEN_HOOKS),$$(call $$(hook))$$(sep))
rm -f $$(FAKEROOT_SCRIPT)
rm -f $$(TARGET_DIR_WARNING_FILE)
echo "chown -R 0:0 $$(TARGET_DIR)" >> $$(FAKEROOT_SCRIPT)
ifneq ($$(ROOTFS_DEVICE_TABLES),)
cat $$(ROOTFS_DEVICE_TABLES) > $$(FULL_DEVICE_TABLE)
ifeq ($$(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
printf '$$(subst $$(sep),\n,$$(PACKAGES_DEVICES_TABLE))' >> $$(FULL_DEVICE_TABLE)
endif
printf '$$(subst $$(sep),\n,$$(PACKAGES_PERMISSIONS_TABLE))' >> $$(FULL_DEVICE_TABLE)
echo "$$(HOST_DIR)/usr/bin/makedevs -d $$(FULL_DEVICE_TABLE) $$(TARGET_DIR)" >> $$(FAKEROOT_SCRIPT)
endif
echo "$$(ROOTFS_$(2)_CMD)" >> $$(FAKEROOT_SCRIPT)
chmod a+x $$(FAKEROOT_SCRIPT)
$$(HOST_DIR)/usr/bin/fakeroot -- $$(FAKEROOT_SCRIPT)
cp support/misc/target-dir-warning.txt $$(TARGET_DIR_WARNING_FILE)
-@rm -f $$(FAKEROOT_SCRIPT) $$(FULL_DEVICE_TABLE)
$$(foreach hook,$$(ROOTFS_$(2)_POST_GEN_HOOKS),$$(call $$(hook))$$(sep))
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_GZIP),y)
gzip -9 -c $$@ > $$@.gz
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_BZIP2),y)
bzip2 -9 -c $$@ > $$@.bz2
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZMA),y)
$$(LZMA) -9 -c $$@ > $$@.lzma
endif
rootfs-$(1)-show-depends:
@echo $$(ROOTFS_$(2)_DEPENDENCIES)
rootfs-$(1): $$(BINARIES_DIR)/rootfs.$(1) $$(ROOTFS_$(2)_POST_TARGETS)
ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
TARGETS += rootfs-$(1)
endif
endef
define ROOTFS_TARGET
$(call ROOTFS_TARGET_INTERNAL,$(1),$(call UPPERCASE,$(1)))
endef
include fs/*/*.mk