118534fe54
Currently, some filesystems may want to tweak the content of the target
directory, create special device nodes etc... This all means that:
- the content of the target directory for a specific filesystems may
depend on whether another filesystem is enabled or not; for example,
cpio will create a /init script or symlink and a /dev/console node;
- the filesystems can not be built in parallel, because they may change
the content of the target directory while another is being assembled.
Furthermore, the same fakeroot script is executed over-and-over-again
for each filesystem, to create the device nodes, the users and their
homes and files, and setting permissions...
We introduce an intermediate tarball, for which we do the full fakeroot
shebang.
That tarball then serves as the base for the other filesystems, with a
very simple fakeroot script that untars the common tarball, and calls
the actual filesystem image generator on that.
Note that we use a very simple tar command to generate the intermediate
tarball, because we are not concerned with reproducibility of the
archive itself (only of the archived files).
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
184 lines
6.6 KiB
Makefile
184 lines
6.6 KiB
Makefile
#
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# Macro that builds the needed Makefile target to create a root
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# filesystem image.
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#
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# The following variable must be defined before calling this macro
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#
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# ROOTFS_$(FSTYPE)_CMD, the command that generates the root
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# filesystem image. A single command is allowed. The filename of the
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# filesystem image that it must generate is $$@.
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#
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# The following variables can optionaly be defined
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#
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# ROOTFS_$(FSTYPE)_DEPENDENCIES, the list of dependencies needed to
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# build the root filesystem (usually host tools)
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#
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# ROOTFS_$(FSTYPE)_PRE_GEN_HOOKS, a list of hooks to call before
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# generating the filesystem image
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#
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# ROOTFS_$(FSTYPE)_POST_GEN_HOOKS, a list of hooks to call after
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# generating the filesystem image
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#
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# In terms of configuration option, this macro assumes that the
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# BR2_TARGET_ROOTFS_$(FSTYPE) config option allows to enable/disable
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# the generation of a filesystem image of a particular type. If
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# the configuration options BR2_TARGET_ROOTFS_$(FSTYPE)_GZIP,
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# BR2_TARGET_ROOTFS_$(FSTYPE)_BZIP2 or
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# BR2_TARGET_ROOTFS_$(FSTYPE)_LZMA exist and are enabled, then the
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# macro will automatically generate a compressed filesystem image.
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FS_DIR = $(BUILD_DIR)/buildroot-fs
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FULL_DEVICE_TABLE = $(FS_DIR)/device_table.txt
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ROOTFS_DEVICE_TABLES = $(call qstrip,$(BR2_ROOTFS_DEVICE_TABLE) \
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$(BR2_ROOTFS_STATIC_DEVICE_TABLE))
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USERS_TABLE = $(FS_DIR)/users_table.txt
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ROOTFS_USERS_TABLES = $(call qstrip,$(BR2_ROOTFS_USERS_TABLES))
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ifeq ($(BR2_REPRODUCIBLE),y)
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define ROOTFS_REPRODUCIBLE
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find $(TARGET_DIR) -print0 | xargs -0 -r touch -hd @$(SOURCE_DATE_EPOCH)
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endef
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endif
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ROOTFS_COMMON_TAR = $(FS_DIR)/rootfs.common.tar
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# Command to create the common tarball from the base target directory.
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define ROOTFS_COMMON_TAR_CMD
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tar cf $(ROOTFS_COMMON_TAR) --numeric-owner \
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--exclude=$(notdir $(TARGET_DIR_WARNING_FILE)) \
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-C $(TARGET_DIR) .
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endef
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# Command to extract the common tarball into the per-rootfs target directory
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define ROOTFS_COMMON_UNTAR_CMD
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mkdir -p $(TARGET_DIR)
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tar xf $(ROOTFS_COMMON_TAR) -C $(TARGET_DIR)
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endef
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.PHONY: rootfs-common
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rootfs-common: $(ROOTFS_COMMON_TAR)
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ROOTFS_COMMON_DEPENDENCIES = \
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host-fakeroot host-makedevs \
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$(if $(PACKAGES_USERS)$(ROOTFS_USERS_TABLES),host-mkpasswd)
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# When doing the common tarball, we're not really doing a rootfs.
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$(ROOTFS_COMMON_TAR): ROOTFS=
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$(ROOTFS_COMMON_TAR): FAKEROOT_SCRIPT=$(FS_DIR)/fakeroot.fs
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$(ROOTFS_COMMON_TAR): $(ROOTFS_COMMON_DEPENDENCIES) target-finalize
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@$(call MESSAGE,"Generating common rootfs tarball")
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rm -rf $(FS_DIR)
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mkdir -p $(FS_DIR)
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echo '#!/bin/sh' > $(FAKEROOT_SCRIPT)
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echo "set -e" >> $(FAKEROOT_SCRIPT)
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echo "chown -h -R 0:0 $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
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ifneq ($(ROOTFS_USERS_TABLES),)
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cat $(ROOTFS_USERS_TABLES) >> $(USERS_TABLE)
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endif
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$(call PRINTF,$(PACKAGES_USERS)) >> $(USERS_TABLE)
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PATH=$(BR_PATH) $(TOPDIR)/support/scripts/mkusers $(USERS_TABLE) $(TARGET_DIR) >> $(FAKEROOT_SCRIPT)
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ifneq ($(ROOTFS_DEVICE_TABLES),)
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cat $(ROOTFS_DEVICE_TABLES) > $(FULL_DEVICE_TABLE)
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ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
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$(call PRINTF,$(PACKAGES_DEVICES_TABLE)) >> $(FULL_DEVICE_TABLE)
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endif
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endif
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$(call PRINTF,$(PACKAGES_PERMISSIONS_TABLE)) >> $(FULL_DEVICE_TABLE)
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echo "$(HOST_DIR)/bin/makedevs -d $(FULL_DEVICE_TABLE) $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
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$(foreach s,$(call qstrip,$(BR2_ROOTFS_POST_FAKEROOT_SCRIPT)),\
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echo "echo '$(TERM_BOLD)>>> Executing fakeroot script $(s)$(TERM_RESET)'" >> $(FAKEROOT_SCRIPT); \
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echo $(EXTRA_ENV) $(s) $(TARGET_DIR) $(BR2_ROOTFS_POST_SCRIPT_ARGS) >> $(FAKEROOT_SCRIPT)$(sep))
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$(foreach hook,$(ROOTFS_PRE_CMD_HOOKS),\
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$(call PRINTF,$($(hook))) >> $(FAKEROOT_SCRIPT)$(sep))
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$(call PRINTF,$(ROOTFS_COMMON_TAR_CMD)) >> $(FAKEROOT_SCRIPT)
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$(foreach hook,$(ROOTFS_POST_CMD_HOOKS),\
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$(call PRINTF,$($(hook))) >> $(FAKEROOT_SCRIPT)$(sep))
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chmod a+x $(FAKEROOT_SCRIPT)
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PATH=$(BR_PATH) $(HOST_DIR)/bin/fakeroot -- $(FAKEROOT_SCRIPT)
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rootfs-common-show-depends:
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@echo $(ROOTFS_COMMON_DEPENDENCIES)
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# Since this function will be called from within an $(eval ...)
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# all variable references except the arguments must be $$-quoted.
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define inner-rootfs
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ROOTFS_$(2)_DIR = $$(FS_DIR)/$(1)
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ROOTFS_$(2)_TARGET_DIR = $$(ROOTFS_$(2)_DIR)/target
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ROOTFS_$(2)_DEPENDENCIES += rootfs-common
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_GZIP),y)
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ROOTFS_$(2)_COMPRESS_EXT = .gz
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ROOTFS_$(2)_COMPRESS_CMD = gzip -9 -c
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endif
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_BZIP2),y)
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ROOTFS_$(2)_COMPRESS_EXT = .bz2
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ROOTFS_$(2)_COMPRESS_CMD = bzip2 -9 -c
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endif
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZMA),y)
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ROOTFS_$(2)_DEPENDENCIES += host-lzma
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ROOTFS_$(2)_COMPRESS_EXT = .lzma
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ROOTFS_$(2)_COMPRESS_CMD = $$(LZMA) -9 -c
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endif
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZ4),y)
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ROOTFS_$(2)_DEPENDENCIES += host-lz4
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ROOTFS_$(2)_COMPRESS_EXT = .lz4
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ROOTFS_$(2)_COMPRESS_CMD = lz4 -l -9 -c
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endif
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZO),y)
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ROOTFS_$(2)_DEPENDENCIES += host-lzop
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ROOTFS_$(2)_COMPRESS_EXT = .lzo
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ROOTFS_$(2)_COMPRESS_CMD = $$(LZOP) -9 -c
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endif
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)_XZ),y)
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ROOTFS_$(2)_DEPENDENCIES += host-xz
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ROOTFS_$(2)_COMPRESS_EXT = .xz
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ROOTFS_$(2)_COMPRESS_CMD = xz -9 -C crc32 -c
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endif
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$$(BINARIES_DIR)/rootfs.$(1): ROOTFS=$(2)
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$$(BINARIES_DIR)/rootfs.$(1): FAKEROOT_SCRIPT=$$(ROOTFS_$(2)_DIR)/fakeroot
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$$(BINARIES_DIR)/rootfs.$(1): $$(ROOTFS_$(2)_DEPENDENCIES)
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@$$(call MESSAGE,"Generating root filesystem image rootfs.$(1)")
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rm -rf $$(ROOTFS_$(2)_DIR)
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mkdir -p $$(ROOTFS_$(2)_DIR)
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echo '#!/bin/sh' > $$(FAKEROOT_SCRIPT)
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echo "set -e" >> $$(FAKEROOT_SCRIPT)
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$$(call PRINTF,$$(ROOTFS_COMMON_UNTAR_CMD)) >> $$(FAKEROOT_SCRIPT)
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$$(foreach hook,$$(ROOTFS_$(2)_PRE_GEN_HOOKS),\
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$$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep))
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$$(call PRINTF,$$(ROOTFS_REPRODUCIBLE)) >> $$(FAKEROOT_SCRIPT)
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$$(call PRINTF,$$(ROOTFS_$(2)_CMD)) >> $$(FAKEROOT_SCRIPT)
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chmod a+x $$(FAKEROOT_SCRIPT)
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PATH=$$(BR_PATH) $$(HOST_DIR)/bin/fakeroot -- $$(FAKEROOT_SCRIPT)
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ifneq ($$(ROOTFS_$(2)_COMPRESS_CMD),)
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PATH=$$(BR_PATH) $$(ROOTFS_$(2)_COMPRESS_CMD) $$@ > $$@$$(ROOTFS_$(2)_COMPRESS_EXT)
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endif
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$$(foreach hook,$$(ROOTFS_$(2)_POST_GEN_HOOKS),$$(call $$(hook))$$(sep))
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rootfs-$(1)-show-depends:
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@echo $$(ROOTFS_$(2)_DEPENDENCIES)
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rootfs-$(1): $$(BINARIES_DIR)/rootfs.$(1)
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.PHONY: rootfs-$(1) rootfs-$(1)-show-depends
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ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
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TARGETS_ROOTFS += rootfs-$(1)
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PACKAGES += $$(filter-out rootfs-%,$$(ROOTFS_$(2)_DEPENDENCIES))
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endif
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# Check for legacy POST_TARGETS rules
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ifneq ($$(ROOTFS_$(2)_POST_TARGETS),)
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$$(error Filesystem $(1) uses post-target rules, which are no longer supported.\
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Update $(1) to use post-gen hooks instead)
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endif
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endef
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# $(pkgname) also works well to return the filesystem name
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rootfs = $(call inner-rootfs,$(pkgname),$(call UPPERCASE,$(pkgname)))
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include $(sort $(wildcard fs/*/*.mk))
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