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1 #
2 # Macro that builds the needed Makefile target to create a root
3 # filesystem image.
4 #
5 # The following variable must be defined before calling this macro
6 #
7 #  ROOTFS_$(FSTYPE)_CMD, the command that generates the root
8 #  filesystem image. A single command is allowed. The filename of the
9 #  filesystem image that it must generate is $$@.
10 #
11 # The following variables can optionaly be defined
12 #
13 #  ROOTFS_$(FSTYPE)_DEPENDENCIES, the list of dependencies needed to
14 #  build the root filesystem (usually host tools)
15 #
16 #  ROOTFS_$(FSTYPE)_PRE_GEN_HOOKS, a list of hooks to call before
17 #  generating the filesystem image
18 #
19 #  ROOTFS_$(FSTYPE)_POST_GEN_HOOKS, a list of hooks to call after
20 #  generating the filesystem image
21 #
22 # In terms of configuration option, this macro assumes that the
23 # BR2_TARGET_ROOTFS_$(FSTYPE) config option allows to enable/disable
24 # the generation of a filesystem image of a particular type. If
25 # the configuration options BR2_TARGET_ROOTFS_$(FSTYPE)_GZIP,
26 # BR2_TARGET_ROOTFS_$(FSTYPE)_BZIP2 or
27 # BR2_TARGET_ROOTFS_$(FSTYPE)_LZMA exist and are enabled, then the
28 # macro will automatically generate a compressed filesystem image.
29
30 FS_DIR = $(BUILD_DIR)/buildroot-fs
31 FULL_DEVICE_TABLE = $(FS_DIR)/device_table.txt
32 ROOTFS_DEVICE_TABLES = $(call qstrip,$(BR2_ROOTFS_DEVICE_TABLE) \
33         $(BR2_ROOTFS_STATIC_DEVICE_TABLE))
34 USERS_TABLE = $(FS_DIR)/users_table.txt
35 ROOTFS_USERS_TABLES = $(call qstrip,$(BR2_ROOTFS_USERS_TABLES))
36
37 ifeq ($(BR2_REPRODUCIBLE),y)
38 define ROOTFS_REPRODUCIBLE
39         find $(TARGET_DIR) -print0 | xargs -0 -r touch -hd @$(SOURCE_DATE_EPOCH)
40 endef
41 endif
42
43 ROOTFS_COMMON_TAR = $(FS_DIR)/rootfs.common.tar
44
45 # Command to create the common tarball from the base target directory.
46 define ROOTFS_COMMON_TAR_CMD
47         tar cf $(ROOTFS_COMMON_TAR) --numeric-owner \
48                 --exclude=$(notdir $(TARGET_DIR_WARNING_FILE)) \
49                 -C $(TARGET_DIR) .
50 endef
51
52 # Command to extract the common tarball into the per-rootfs target directory
53 define ROOTFS_COMMON_UNTAR_CMD
54         mkdir -p $(TARGET_DIR)
55         tar xf $(ROOTFS_COMMON_TAR) -C $(TARGET_DIR)
56 endef
57
58 .PHONY: rootfs-common
59 rootfs-common: $(ROOTFS_COMMON_TAR)
60
61 # Emulate being in a filesystem, so that we can have our own TARGET_DIR.
62 ROOTFS_COMMON_TARGET_DIR = $(FS_DIR)/target
63
64 ROOTFS_COMMON_DEPENDENCIES = \
65         host-fakeroot host-makedevs \
66         $(if $(PACKAGES_USERS)$(ROOTFS_USERS_TABLES),host-mkpasswd)
67
68 $(ROOTFS_COMMON_TAR): ROOTFS=COMMON
69 $(ROOTFS_COMMON_TAR): FAKEROOT_SCRIPT=$(FS_DIR)/fakeroot.fs
70 $(ROOTFS_COMMON_TAR): $(ROOTFS_COMMON_DEPENDENCIES) target-finalize
71         @$(call MESSAGE,"Generating common rootfs tarball")
72         rm -rf $(FS_DIR)
73         mkdir -p $(FS_DIR)
74         rsync -au $(BASE_TARGET_DIR)/ $(TARGET_DIR)
75         echo '#!/bin/sh' > $(FAKEROOT_SCRIPT)
76         echo "set -e" >> $(FAKEROOT_SCRIPT)
77         echo "chown -h -R 0:0 $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
78 ifneq ($(ROOTFS_USERS_TABLES),)
79         cat $(ROOTFS_USERS_TABLES) >> $(USERS_TABLE)
80 endif
81         $(call PRINTF,$(PACKAGES_USERS)) >> $(USERS_TABLE)
82         PATH=$(BR_PATH) $(TOPDIR)/support/scripts/mkusers $(USERS_TABLE) $(TARGET_DIR) >> $(FAKEROOT_SCRIPT)
83 ifneq ($(ROOTFS_DEVICE_TABLES),)
84         cat $(ROOTFS_DEVICE_TABLES) > $(FULL_DEVICE_TABLE)
85 ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
86         $(call PRINTF,$(PACKAGES_DEVICES_TABLE)) >> $(FULL_DEVICE_TABLE)
87 endif
88 endif
89         $(call PRINTF,$(PACKAGES_PERMISSIONS_TABLE)) >> $(FULL_DEVICE_TABLE)
90         echo "$(HOST_DIR)/bin/makedevs -d $(FULL_DEVICE_TABLE) $(TARGET_DIR)" >> $(FAKEROOT_SCRIPT)
91         $(foreach s,$(call qstrip,$(BR2_ROOTFS_POST_FAKEROOT_SCRIPT)),\
92                 echo "echo '$(TERM_BOLD)>>>   Executing fakeroot script $(s)$(TERM_RESET)'" >> $(FAKEROOT_SCRIPT); \
93                 echo $(EXTRA_ENV) $(s) $(TARGET_DIR) $(BR2_ROOTFS_POST_SCRIPT_ARGS) >> $(FAKEROOT_SCRIPT)$(sep))
94         $(foreach hook,$(ROOTFS_PRE_CMD_HOOKS),\
95                 $(call PRINTF,$($(hook))) >> $(FAKEROOT_SCRIPT)$(sep))
96         $(call PRINTF,$(ROOTFS_COMMON_TAR_CMD)) >> $(FAKEROOT_SCRIPT)
97         chmod a+x $(FAKEROOT_SCRIPT)
98         PATH=$(BR_PATH) $(HOST_DIR)/bin/fakeroot -- $(FAKEROOT_SCRIPT)
99         $(Q)rm -rf $(TARGET_DIR)
100
101 rootfs-common-show-depends:
102         @echo $(ROOTFS_COMMON_DEPENDENCIES)
103
104 # Since this function will be called from within an $(eval ...)
105 # all variable references except the arguments must be $$-quoted.
106 define inner-rootfs
107
108 ROOTFS_$(2)_DIR = $$(FS_DIR)/$(1)
109 ROOTFS_$(2)_TARGET_DIR = $$(ROOTFS_$(2)_DIR)/target
110
111 ROOTFS_$(2)_DEPENDENCIES += rootfs-common
112
113 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_GZIP),y)
114 ROOTFS_$(2)_COMPRESS_EXT = .gz
115 ROOTFS_$(2)_COMPRESS_CMD = gzip -9 -c
116 endif
117 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_BZIP2),y)
118 ROOTFS_$(2)_COMPRESS_EXT = .bz2
119 ROOTFS_$(2)_COMPRESS_CMD = bzip2 -9 -c
120 endif
121 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZMA),y)
122 ROOTFS_$(2)_DEPENDENCIES += host-lzma
123 ROOTFS_$(2)_COMPRESS_EXT = .lzma
124 ROOTFS_$(2)_COMPRESS_CMD = $$(LZMA) -9 -c
125 endif
126 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZ4),y)
127 ROOTFS_$(2)_DEPENDENCIES += host-lz4
128 ROOTFS_$(2)_COMPRESS_EXT = .lz4
129 ROOTFS_$(2)_COMPRESS_CMD = lz4 -l -9 -c
130 endif
131 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_LZO),y)
132 ROOTFS_$(2)_DEPENDENCIES += host-lzop
133 ROOTFS_$(2)_COMPRESS_EXT = .lzo
134 ROOTFS_$(2)_COMPRESS_CMD = $$(LZOP) -9 -c
135 endif
136 ifeq ($$(BR2_TARGET_ROOTFS_$(2)_XZ),y)
137 ROOTFS_$(2)_DEPENDENCIES += host-xz
138 ROOTFS_$(2)_COMPRESS_EXT = .xz
139 ROOTFS_$(2)_COMPRESS_CMD = xz -9 -C crc32 -c
140 endif
141
142 $$(BINARIES_DIR)/rootfs.$(1): ROOTFS=$(2)
143 $$(BINARIES_DIR)/rootfs.$(1): FAKEROOT_SCRIPT=$$(ROOTFS_$(2)_DIR)/fakeroot
144 $$(BINARIES_DIR)/rootfs.$(1): $$(ROOTFS_$(2)_DEPENDENCIES)
145         @$$(call MESSAGE,"Generating root filesystem image rootfs.$(1)")
146         rm -rf $$(ROOTFS_$(2)_DIR)
147         mkdir -p $$(ROOTFS_$(2)_DIR)
148         echo '#!/bin/sh' > $$(FAKEROOT_SCRIPT)
149         echo "set -e" >> $$(FAKEROOT_SCRIPT)
150         $$(call PRINTF,$$(ROOTFS_COMMON_UNTAR_CMD)) >> $$(FAKEROOT_SCRIPT)
151         $$(foreach hook,$$(ROOTFS_$(2)_PRE_GEN_HOOKS),\
152                 $$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep))
153         $$(call PRINTF,$$(ROOTFS_REPRODUCIBLE)) >> $$(FAKEROOT_SCRIPT)
154         $$(call PRINTF,$$(ROOTFS_$(2)_CMD)) >> $$(FAKEROOT_SCRIPT)
155         chmod a+x $$(FAKEROOT_SCRIPT)
156         PATH=$$(BR_PATH) $$(HOST_DIR)/bin/fakeroot -- $$(FAKEROOT_SCRIPT)
157         $(Q)rm -rf $$(TARGET_DIR)
158 ifneq ($$(ROOTFS_$(2)_COMPRESS_CMD),)
159         PATH=$$(BR_PATH) $$(ROOTFS_$(2)_COMPRESS_CMD) $$@ > $$@$$(ROOTFS_$(2)_COMPRESS_EXT)
160 endif
161         $$(foreach hook,$$(ROOTFS_$(2)_POST_GEN_HOOKS),$$(call $$(hook))$$(sep))
162
163 rootfs-$(1)-show-depends:
164         @echo $$(ROOTFS_$(2)_DEPENDENCIES)
165
166 rootfs-$(1): $$(BINARIES_DIR)/rootfs.$(1)
167
168 .PHONY: rootfs-$(1) rootfs-$(1)-show-depends
169
170 ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
171 TARGETS_ROOTFS += rootfs-$(1)
172 PACKAGES += $$(filter-out rootfs-%,$$(ROOTFS_$(2)_DEPENDENCIES))
173 endif
174
175 # Check for legacy POST_TARGETS rules
176 ifneq ($$(ROOTFS_$(2)_POST_TARGETS),)
177 $$(error Filesystem $(1) uses post-target rules, which are no longer supported.\
178         Update $(1) to use post-gen hooks instead)
179 endif
180
181 endef
182
183 # $(pkgname) also works well to return the filesystem name
184 rootfs = $(call inner-rootfs,$(pkgname),$(call UPPERCASE,$(pkgname)))
185
186 include $(sort $(wildcard fs/*/*.mk))