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buildroot/fs/common.mk
Norbert Lange 5e78e7e97d fs: clean the volatile /run and /tmp directories 
At run time, /run and /tmp get overmounted with a tmpfs, so anything
that is there becomes inaccessible.

Scripts in the fakeroot environment could call tools preparing the early
environment, leaving traces in /run or /tmp. For example, mkusers might
create home directories in /run: openssh sets the sshd home directory to
/run/sshd, so mkusers creates it. But since a tmpfs is mounted over it,
it doesn't exist at runtime, so the openssh service creates it at
startup (and deletes it when the service is stopped).

In addition, packages or rootfs overlay may leave things there as well.
Those may actually pose a runtime problem because the created file or
directory is missing - or it may not be a problem because the package
creates the missing files/directories on startup. In this situation,
it's better not to have them in the rootfs image (because they're not
functional anyway), but it's good to leave them in TARGET_DIR to make it
easier to debug the situation.

Therefore, remove the contents of /run and /tmp in the fakeroot
environment after ROOTFS_PRE_GEN_HOOKS, so they are still left in
TARGET_DIR.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2022-01-09 10:04:34 +01:00

229 lines
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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
ROOTFS_DEVICE_TABLES = $(call qstrip,$(BR2_ROOTFS_DEVICE_TABLE) \
$(BR2_ROOTFS_STATIC_DEVICE_TABLE))
ROOTFS_USERS_TABLES = $(call qstrip,$(BR2_ROOTFS_USERS_TABLES))
ROOTFS_FULL_DEVICES_TABLE = $(FS_DIR)/full_devices_table.txt
ROOTFS_FULL_USERS_TABLE = $(FS_DIR)/full_users_table.txt
ROOTFS_COMMON_NAME = rootfs-common
ROOTFS_COMMON_TYPE = rootfs
ROOTFS_COMMON_DEPENDENCIES = \
host-fakeroot host-makedevs \
$(BR2_TAR_HOST_DEPENDENCY) \
$(if $(PACKAGES_USERS)$(ROOTFS_USERS_TABLES),host-mkpasswd)
ifeq ($(BR2_REPRODUCIBLE),y)
define ROOTFS_REPRODUCIBLE
find $(TARGET_DIR) -print0 | xargs -0 -r touch -hd @$(SOURCE_DATE_EPOCH)
endef
endif
ifeq ($(BR2_PACKAGE_REFPOLICY),y)
define ROOTFS_SELINUX
$(HOST_DIR)/sbin/setfiles -m -r $(TARGET_DIR) \
-c $(TARGET_DIR)/etc/selinux/targeted/policy/policy.$(BR2_PACKAGE_LIBSEPOL_POLICY_VERSION) \
$(TARGET_DIR)/etc/selinux/targeted/contexts/files/file_contexts \
$(TARGET_DIR)
endef
ROOTFS_COMMON_DEPENDENCIES += host-policycoreutils
endif
ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES = $(sort \
$(if $(filter undefined,$(origin ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES__X)), \
$(eval ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES__X := \
$(foreach p, \
$(ROOTFS_COMMON_DEPENDENCIES), \
$(p) \
$($(call UPPERCASE,$(p))_FINAL_RECURSIVE_DEPENDENCIES) \
) \
) \
) \
$(ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES__X))
.PHONY: rootfs-common
rootfs-common: $(ROOTFS_COMMON_DEPENDENCIES) target-finalize
@$(call MESSAGE,"Generating root filesystems common tables")
rm -rf $(FS_DIR)
mkdir -p $(FS_DIR)
$(call PRINTF,$(PACKAGES_USERS)) >> $(ROOTFS_FULL_USERS_TABLE)
ifneq ($(ROOTFS_USERS_TABLES),)
cat $(ROOTFS_USERS_TABLES) >> $(ROOTFS_FULL_USERS_TABLE)
endif
$(call PRINTF,$(PACKAGES_PERMISSIONS_TABLE)) > $(ROOTFS_FULL_DEVICES_TABLE)
ifneq ($(ROOTFS_DEVICE_TABLES),)
cat $(ROOTFS_DEVICE_TABLES) >> $(ROOTFS_FULL_DEVICES_TABLE)
endif
ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
$(call PRINTF,$(PACKAGES_DEVICES_TABLE)) >> $(ROOTFS_FULL_DEVICES_TABLE)
endif
rootfs-common-show-depends:
@echo $(ROOTFS_COMMON_DEPENDENCIES)
.PHONY: rootfs-common-show-info
rootfs-common-show-info:
@:
$(info $(call clean-json,{ $(call json-info,ROOTFS_COMMON) }))
# Since this function will be called from within an $(eval ...)
# all variable references except the arguments must be $$-quoted.
define inner-rootfs
ROOTFS_$(2)_NAME = rootfs-$(1)
ROOTFS_$(2)_TYPE = rootfs
ROOTFS_$(2)_IMAGE_NAME ?= rootfs.$(1)
ROOTFS_$(2)_FINAL_IMAGE_NAME = $$(strip $$(ROOTFS_$(2)_IMAGE_NAME))
ROOTFS_$(2)_DIR = $$(FS_DIR)/$(1)
ROOTFS_$(2)_TARGET_DIR = $$(ROOTFS_$(2)_DIR)/target
ROOTFS_$(2)_DEPENDENCIES += rootfs-common
ROOTFS_$(2)_FINAL_RECURSIVE_DEPENDENCIES = $$(sort \
$$(if $$(filter undefined,$$(origin ROOTFS_$(2)_FINAL_RECURSIVE_DEPENDENCIES__X)), \
$$(eval ROOTFS_$(2)_FINAL_RECURSIVE_DEPENDENCIES__X := \
$$(foreach p, \
$$(ROOTFS_$(2)_DEPENDENCIES), \
$$(p) \
$$($$(call UPPERCASE,$$(p))_FINAL_RECURSIVE_DEPENDENCIES) \
) \
) \
) \
$$(ROOTFS_$(2)_FINAL_RECURSIVE_DEPENDENCIES__X))
ifeq ($$(BR2_TARGET_ROOTFS_$(2)_GZIP),y)
ROOTFS_$(2)_COMPRESS_EXT = .gz
ROOTFS_$(2)_COMPRESS_CMD = gzip -9 -c -n
endif
ifeq ($$(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
ifeq ($(BR2_REPRODUCIBLE),)
ROOTFS_$(2)_COMPRESS_CMD += -T $(PARALLEL_JOBS)
endif
endif
ifeq ($(BR2_TARGET_ROOTFS_$(2)_ZSTD),y)
ROOTFS_$(2)_DEPENDENCIES += host-zstd
ROOTFS_$(2)_COMPRESS_EXT = .zst
ROOTFS_$(2)_COMPRESS_CMD = zstd -19 -z -f -T$(PARALLEL_JOBS)
endif
$$(BINARIES_DIR)/$$(ROOTFS_$(2)_FINAL_IMAGE_NAME): ROOTFS=$(2)
$$(BINARIES_DIR)/$$(ROOTFS_$(2)_FINAL_IMAGE_NAME): FAKEROOT_SCRIPT=$$(ROOTFS_$(2)_DIR)/fakeroot
$$(BINARIES_DIR)/$$(ROOTFS_$(2)_FINAL_IMAGE_NAME): $$(ROOTFS_$(2)_DEPENDENCIES)
@$$(call MESSAGE,"Generating filesystem image $$(ROOTFS_$(2)_FINAL_IMAGE_NAME)")
mkdir -p $$(@D)
rm -rf $$(ROOTFS_$(2)_DIR)
mkdir -p $$(ROOTFS_$(2)_DIR)
rsync -auH \
--exclude=/$$(notdir $$(TARGET_DIR_WARNING_FILE)) \
$$(BASE_TARGET_DIR)/ \
$$(TARGET_DIR)
echo '#!/bin/sh' > $$(FAKEROOT_SCRIPT)
echo "set -e" >> $$(FAKEROOT_SCRIPT)
echo "chown -h -R 0:0 $$(TARGET_DIR)" >> $$(FAKEROOT_SCRIPT)
PATH=$$(BR_PATH) $$(TOPDIR)/support/scripts/mkusers $$(ROOTFS_FULL_USERS_TABLE) $$(TARGET_DIR) >> $$(FAKEROOT_SCRIPT)
echo "$$(HOST_DIR)/bin/makedevs -d $$(ROOTFS_FULL_DEVICES_TABLE) $$(TARGET_DIR)" >> $$(FAKEROOT_SCRIPT)
$$(foreach hook,$$(ROOTFS_PRE_CMD_HOOKS),\
$$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep))
$$(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_$(2)_PRE_GEN_HOOKS),\
$$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep))
echo "rm -rf $$(TARGET_DIR)/run/* $$(TARGET_DIR)/run/.[^.]* $$(TARGET_DIR)/tmp/* $$(TARGET_DIR)/tmp/.[^.]*" >> $$(FAKEROOT_SCRIPT)
$$(call PRINTF,$$(ROOTFS_REPRODUCIBLE)) >> $$(FAKEROOT_SCRIPT)
$$(call PRINTF,$$(ROOTFS_SELINUX)) >> $$(FAKEROOT_SCRIPT)
$$(call PRINTF,$$(ROOTFS_$(2)_CMD)) >> $$(FAKEROOT_SCRIPT)
chmod a+x $$(FAKEROOT_SCRIPT)
PATH=$$(BR_PATH) FAKEROOTDONTTRYCHOWN=1 $$(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)-show-info:
@:
$$(info $$(call clean-json,{ $$(call json-info,ROOTFS_$(2)) }))
rootfs-$(1): $$(BINARIES_DIR)/$$(ROOTFS_$(2)_FINAL_IMAGE_NAME)
.PHONY: rootfs-$(1) rootfs-$(1)-show-depends rootfs-$(1)-show-info
ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
TARGETS_ROOTFS += rootfs-$(1)
PACKAGES += $$(filter-out rootfs-%,$$(ROOTFS_$(2)_FINAL_RECURSIVE_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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