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kumquat-buildroot/fs/common.mk
Matt Weber c3edec0018 fs/common: allow custom user table to override package-defined users 
Currently, when a custom user table and a package define the same user,
the settings from the package takes precedence over the ones from the
custom user table.

However, it makes sense to allow the settings from the custom user table
take precedence. For example, it would allow redirecting the user's
home directory to an alternate location (e.g. away from tmp and into a
partition that is persistent).

The support/scripts/mkusers script will only retain settings from the
latest definition it finds.

Thus, by passing the custom user table after the package defined users,
it is possible to override the package provided user definitions.

Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2018-10-20 14:33:24 +01:00

188 lines
6.7 KiB
Makefile
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#
# 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
# the configuration 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.
FS_DIR = $(BUILD_DIR)/buildroot-fs
FULL_DEVICE_TABLE = $(FS_DIR)/device_table.txt
ROOTFS_DEVICE_TABLES = $(call qstrip,$(BR2_ROOTFS_DEVICE_TABLE) \
$(BR2_ROOTFS_STATIC_DEVICE_TABLE))
USERS_TABLE = $(FS_DIR)/users_table.txt
ROOTFS_USERS_TABLES = $(call qstrip,$(BR2_ROOTFS_USERS_TABLES))
ifeq ($(BR2_REPRODUCIBLE),y)
define ROOTFS_REPRODUCIBLE
find $(TARGET_DIR) -print0 | xargs -0 -r touch -hd @$(SOURCE_DATE_EPOCH)
endef
endif
ROOTFS_COMMON_TAR = $(FS_DIR)/rootfs.common.tar
# Command to create the common tarball from the base target directory.
define ROOTFS_COMMON_TAR_CMD
tar cf $(ROOTFS_COMMON_TAR) --numeric-owner \
--exclude=$(notdir $(TARGET_DIR_WARNING_FILE)) \
-C $(TARGET_DIR) .
endef
# Command to extract the common tarball into the per-rootfs target directory
define ROOTFS_COMMON_UNTAR_CMD
mkdir -p $(TARGET_DIR)
tar xf $(ROOTFS_COMMON_TAR) -C $(TARGET_DIR)
endef
.PHONY: rootfs-common
rootfs-common: $(ROOTFS_COMMON_TAR)
# Emulate being in a filesystem, so that we can have our own TARGET_DIR.
ROOTFS_COMMON_TARGET_DIR = $(FS_DIR)/target
ROOTFS_COMMON_DEPENDENCIES = \
host-fakeroot host-makedevs \
$(if $(PACKAGES_USERS)$(ROOTFS_USERS_TABLES),host-mkpasswd)
$(ROOTFS_COMMON_TAR): ROOTFS=COMMON
$(ROOTFS_COMMON_TAR): FAKEROOT_SCRIPT=$(FS_DIR)/fakeroot.fs
$(ROOTFS_COMMON_TAR): $(ROOTFS_COMMON_DEPENDENCIES) target-finalize
@$(call MESSAGE,"Generating common rootfs tarball")
rm -rf $(FS_DIR)
mkdir -p $(FS_DIR)
rsync -auH $(BASE_TARGET_DIR)/ $(TARGET_DIR)
echo '#!/bin/sh' > $(FAKEROOT_SCRIPT)
echo "set -e" >> $(FAKEROOT_SCRIPT)
echo "chown -h -R 0:0 $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
$(call PRINTF,$(PACKAGES_USERS)) >> $(USERS_TABLE)
ifneq ($(ROOTFS_USERS_TABLES),)
cat $(ROOTFS_USERS_TABLES) >> $(USERS_TABLE)
endif
PATH=$(BR_PATH) $(TOPDIR)/support/scripts/mkusers $(USERS_TABLE) $(TARGET_DIR) >> $(FAKEROOT_SCRIPT)
ifneq ($(ROOTFS_DEVICE_TABLES),)
cat $(ROOTFS_DEVICE_TABLES) > $(FULL_DEVICE_TABLE)
ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
$(call PRINTF,$(PACKAGES_DEVICES_TABLE)) >> $(FULL_DEVICE_TABLE)
endif
endif
$(call PRINTF,$(PACKAGES_PERMISSIONS_TABLE)) >> $(FULL_DEVICE_TABLE)
echo "$(HOST_DIR)/bin/makedevs -d $(FULL_DEVICE_TABLE) $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
$(foreach s,$(call qstrip,$(BR2_ROOTFS_POST_FAKEROOT_SCRIPT)),\
echo "echo '$(TERM_BOLD)>>> Executing fakeroot script $(s)$(TERM_RESET)'" >> $(FAKEROOT_SCRIPT); \
echo $(EXTRA_ENV) $(s) $(TARGET_DIR) $(BR2_ROOTFS_POST_SCRIPT_ARGS) >> $(FAKEROOT_SCRIPT)$(sep))
$(foreach hook,$(ROOTFS_PRE_CMD_HOOKS),\
$(call PRINTF,$($(hook))) >> $(FAKEROOT_SCRIPT)$(sep))
$(call PRINTF,$(ROOTFS_COMMON_TAR_CMD)) >> $(FAKEROOT_SCRIPT)
chmod a+x $(FAKEROOT_SCRIPT)
PATH=$(BR_PATH) $(HOST_DIR)/bin/fakeroot -- $(FAKEROOT_SCRIPT)
$(Q)rm -rf $(TARGET_DIR)
rootfs-common-show-depends:
@echo $(ROOTFS_COMMON_DEPENDENCIES)
# Since this function will be called from within an $(eval ...)
# all variable references except the arguments must be $$-quoted.
define inner-rootfs
ROOTFS_$(2)_DIR = $$(FS_DIR)/$(1)
ROOTFS_$(2)_TARGET_DIR = $$(ROOTFS_$(2)_DIR)/target
ROOTFS_$(2)_DEPENDENCIES += rootfs-common
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_GZIP),y)
ROOTFS_$(2)_COMPRESS_EXT = .gz
ROOTFS_$(2)_COMPRESS_CMD = gzip -9 -c
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_BZIP2),y)
ROOTFS_$(2)_COMPRESS_EXT = .bz2
ROOTFS_$(2)_COMPRESS_CMD = bzip2 -9 -c
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZMA),y)
ROOTFS_$(2)_DEPENDENCIES += host-lzma
ROOTFS_$(2)_COMPRESS_EXT = .lzma
ROOTFS_$(2)_COMPRESS_CMD = $$(LZMA) -9 -c
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZ4),y)
ROOTFS_$(2)_DEPENDENCIES += host-lz4
ROOTFS_$(2)_COMPRESS_EXT = .lz4
ROOTFS_$(2)_COMPRESS_CMD = lz4 -l -9 -c
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZO),y)
ROOTFS_$(2)_DEPENDENCIES += host-lzop
ROOTFS_$(2)_COMPRESS_EXT = .lzo
ROOTFS_$(2)_COMPRESS_CMD = $$(LZOP) -9 -c
endif
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_XZ),y)
ROOTFS_$(2)_DEPENDENCIES += host-xz
ROOTFS_$(2)_COMPRESS_EXT = .xz
ROOTFS_$(2)_COMPRESS_CMD = xz -9 -C crc32 -c
endif
$$(BINARIES_DIR)/rootfs.$(1): ROOTFS=$(2)
$$(BINARIES_DIR)/rootfs.$(1): FAKEROOT_SCRIPT=$$(ROOTFS_$(2)_DIR)/fakeroot
$$(BINARIES_DIR)/rootfs.$(1): $$(ROOTFS_$(2)_DEPENDENCIES)
@$$(call MESSAGE,"Generating root filesystem image rootfs.$(1)")
rm -rf $$(ROOTFS_$(2)_DIR)
mkdir -p $$(ROOTFS_$(2)_DIR)
echo '#!/bin/sh' > $$(FAKEROOT_SCRIPT)
echo "set -e" >> $$(FAKEROOT_SCRIPT)
$$(call PRINTF,$$(ROOTFS_COMMON_UNTAR_CMD)) >> $$(FAKEROOT_SCRIPT)
$$(foreach hook,$$(ROOTFS_$(2)_PRE_GEN_HOOKS),\
$$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep))
$$(call PRINTF,$$(ROOTFS_REPRODUCIBLE)) >> $$(FAKEROOT_SCRIPT)
$$(call PRINTF,$$(ROOTFS_$(2)_CMD)) >> $$(FAKEROOT_SCRIPT)
chmod a+x $$(FAKEROOT_SCRIPT)
PATH=$$(BR_PATH) $$(HOST_DIR)/bin/fakeroot -- $$(FAKEROOT_SCRIPT)
$(Q)rm -rf $$(TARGET_DIR)
ifneq ($$(ROOTFS_$(2)_COMPRESS_CMD),)
PATH=$$(BR_PATH) $$(ROOTFS_$(2)_COMPRESS_CMD) $$@ > $$@$$(ROOTFS_$(2)_COMPRESS_EXT)
endif
$$(foreach hook,$$(ROOTFS_$(2)_POST_GEN_HOOKS),$$(call $$(hook))$$(sep))
rootfs-$(1)-show-depends:
@echo $$(ROOTFS_$(2)_DEPENDENCIES)
rootfs-$(1): $$(BINARIES_DIR)/rootfs.$(1)
.PHONY: rootfs-$(1) rootfs-$(1)-show-depends
ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
TARGETS_ROOTFS += rootfs-$(1)
PACKAGES += $$(filter-out rootfs-%,$$(ROOTFS_$(2)_DEPENDENCIES))
endif
# Check for legacy POST_TARGETS rules
ifneq ($$(ROOTFS_$(2)_POST_TARGETS),)
$$(error Filesystem $(1) uses post-target rules, which are no longer supported.\
Update $(1) to use post-gen hooks instead)
endif
endef
# $(pkgname) also works well to return the filesystem name
rootfs = $(call inner-rootfs,$(pkgname),$(call UPPERCASE,$(pkgname)))
include $(sort $(wildcard fs/*/*.mk))
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