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target: Add new infrastructure for filesystem generation

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In order to avoid code duplication between the different filesystem
generation makefile, we introduce a ROOTFS_TARGET macro. Documentation
for this macro is contained in the patch.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2010-03-10 00:11:58 +01:00
parent b605699f1f
commit 21f3bcc186
2 changed files with 69 additions and 0 deletions
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1
target/Makefile.in
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@ -63,6 +63,7 @@ include target/u-boot/Makefile.in
endif
# and finally build the filesystems/tarballs
include target/common.mk
include target/*/*.mk
# kernel rules

68
target/common.mk Normal file
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@ -0,0 +1,68 @@
#
# 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 $$@.
#
# The following variables can optionaly be defined
#
# ROOTFS_$(FSTYPE)_DEPENDENCIES, the list of dependencies needed to
# build the root filesystem (usually host tools)
#
# ROOTFS_$(FSTYPE)_PRE_GEN_HOOKS, a list of hooks to call before
# generating the filesystem image
#
# ROOTFS_$(FSTYPE)_POST_GEN_HOOKS, a list of hooks to call after
# generating the filesystem image
#
# In terms of configuration option, this macro assumes that the
# BR2_TARGET_ROOTFS_$(FSTYPE) config option allows to enable/disable
# the generation of a filesystem image of a particular type. If
# configura options BR2_TARGET_ROOTFS_$(FSTYPE)_GZIP,
# BR2_TARGET_ROOTFS_$(FSTYPE)_BZIP2 or
# BR2_TARGET_ROOTFS_$(FSTYPE)_LZMA exist and are enabled, then the
# macro will automatically generate a compressed filesystem image.
FAKEROOT_SCRIPT = $(BUILD_DIR)/_fakeroot.fs
define ROOTFS_TARGET_INTERNAL
$(IMAGE).$(1): $(ROOTFS_$(2)_DEPENDENCIES) host-fakeroot makedevs $(if $(BR2_TARGET_ROOTFS_$(2)_LZMA),host-lzma)
@$(call MESSAGE,"Generating root filesystem image $(IMAGE).$(1)")
$(foreach hook,$(ROOTFS_$(2)_PRE_GEN_HOOKS),$(call $(hook))$(sep))
rm -f $(FAKEROOT_SCRIPT)
touch $(BUILD_DIR)/.fakeroot.00000
cat $(BUILD_DIR)/.fakeroot* > $(FAKEROOT_SCRIPT)
echo "chown -R 0:0 $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
ifneq ($(TARGET_DEVICE_TABLE),)
echo "$(HOST_DIR)/usr/bin/makedevs -d $(TARGET_DEVICE_TABLE) $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
endif
echo "$(ROOTFS_$(2)_CMD)" >> $(FAKEROOT_SCRIPT)
chmod a+x $(FAKEROOT_SCRIPT)
$(HOST_DIR)/usr/bin/fakeroot -- $(FAKEROOT_SCRIPT)
-@rm -f $(FAKEROOT_SCRIPT)
$(foreach hook,$(ROOTFS_$(2)_POST_GEN_HOOKS),$(call $(hook))$(sep))
ifeq ($$(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
$(1)-root: $(IMAGE).$(1)
ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
TARGETS += $(1)-root
endif
endef
define ROOTFS_TARGET
$(call ROOTFS_TARGET_INTERNAL,$(1),$(call UPPERCASE,$(1)))
endef