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