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platform_build/tools/fs_config/Android.mk
William Roberts 316f9462af fs_config: introduce passwd generator 
Introduce a generator that outputs passwd files per man(5) passwd.

Succinctly, the output is a colon delimited string containing the following
fields:

  * login name
  * encrypted password (optional)
  * uid (int)
  * gid (int)
  * User name or comment field
  * home directory
  * interpreter (optional)

Multiple colon delimited lines may exist, but will not be separated
across lines.

When run, produces:

foo::2900:2900::/:/system/bin/sh
foo_bar::2901:2901::/:/system/bin/sh
custom_oem1::2902:2902::/:/system/bin/sh

Note that this generator allows for 0 or more config.fs files. This allows for:
  * Unconditional inclusion of /system/etc/passwd in the generated image
  * A blank passwd file if no config.fs files are specified.

This ensures that when OEMs add config.fs files, there is no additional steps
for proper functionality (simpler for OEMs).

The one draw back is the additional inode consumption on system for a possible
blank file.

Test: That it produces a valid passwd file.
Change-Id: I19691c8260f02147ed861f8a319aeab3f5b1738e
Signed-off-by: William Roberts <william.c.roberts@intel.com>
2016-11-29 16:21:17 -08:00

177 lines
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Makefile
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# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := fs_config.c
LOCAL_MODULE := fs_config
LOCAL_SHARED_LIBRARIES := libcutils libselinux
LOCAL_CFLAGS := -Werror
include $(BUILD_HOST_EXECUTABLE)
# One can override the default android_filesystem_config.h file in one of two ways:
#
# 1. The old way:
# To Build the custom target binary for the host to generate the fs_config
# override files. The executable is hard coded to include the
# $(TARGET_ANDROID_FILESYSTEM_CONFIG_H) file if it exists.
# Expectations:
# device/<vendor>/<device>/android_filesystem_config.h
# fills in struct fs_path_config android_device_dirs[] and
# struct fs_path_config android_device_files[]
# device/<vendor>/<device>/device.mk
# PRODUCT_PACKAGES += fs_config_dirs fs_config_files
# If not specified, check if default one to be found
#
# 2. The new way:
# set TARGET_FS_CONFIG_GEN to contain a list of intermediate format files
# for generating the android_filesystem_config.h file.
#
# More information can be found in the README
ANDROID_FS_CONFIG_H := android_filesystem_config.h
ifneq ($(TARGET_ANDROID_FILESYSTEM_CONFIG_H),)
ifneq ($(TARGET_FS_CONFIG_GEN),)
$(error Cannot set TARGET_ANDROID_FILESYSTEM_CONFIG_H and TARGET_FS_CONFIG_GEN simultaneously)
endif
# One and only one file can be specified.
ifneq ($(words $(TARGET_ANDROID_FILESYSTEM_CONFIG_H)),1)
$(error Multiple fs_config files specified, \
see "$(TARGET_ANDROID_FILESYSTEM_CONFIG_H)".)
endif
ifeq ($(filter %/$(ANDROID_FS_CONFIG_H),$(TARGET_ANDROID_FILESYSTEM_CONFIG_H)),)
$(error TARGET_ANDROID_FILESYSTEM_CONFIG_H file name must be $(ANDROID_FS_CONFIG_H), \
see "$(notdir $(TARGET_ANDROID_FILESYSTEM_CONFIG_H))".)
endif
my_fs_config_h := $(TARGET_ANDROID_FILESYSTEM_CONFIG_H)
else ifneq ($(wildcard $(TARGET_DEVICE_DIR)/$(ANDROID_FS_CONFIG_H)),)
ifneq ($(TARGET_FS_CONFIG_GEN),)
$(error Cannot provide $(TARGET_DEVICE_DIR)/$(ANDROID_FS_CONFIG_H) and set TARGET_FS_CONFIG_GEN simultaneously)
endif
my_fs_config_h := $(TARGET_DEVICE_DIR)/$(ANDROID_FS_CONFIG_H)
else
my_fs_config_h := $(LOCAL_PATH)/default/$(ANDROID_FS_CONFIG_H)
endif
##################################
include $(CLEAR_VARS)
LOCAL_SRC_FILES := fs_config_generate.c
LOCAL_MODULE := fs_config_generate_$(TARGET_DEVICE)
LOCAL_MODULE_CLASS := EXECUTABLES
LOCAL_SHARED_LIBRARIES := libcutils
LOCAL_CFLAGS := -Werror -Wno-error=\#warnings
ifneq ($(TARGET_FS_CONFIG_GEN),)
system_android_filesystem_config := system/core/include/private/android_filesystem_config.h
# Generate the "generated_oem_aid.h" file
oem := $(local-generated-sources-dir)/generated_oem_aid.h
$(oem): PRIVATE_LOCAL_PATH := $(LOCAL_PATH)
$(oem): PRIVATE_TARGET_FS_CONFIG_GEN := $(TARGET_FS_CONFIG_GEN)
$(oem): PRIVATE_ANDROID_FS_HDR := $(system_android_filesystem_config)
$(oem): PRIVATE_CUSTOM_TOOL = $(PRIVATE_LOCAL_PATH)/fs_config_generator.py oemaid --aid-header=$(PRIVATE_ANDROID_FS_HDR) $(PRIVATE_TARGET_FS_CONFIG_GEN) > $@
$(oem): $(TARGET_FS_CONFIG_GEN) $(LOCAL_PATH)/fs_config_generator.py
$(transform-generated-source)
# Generate the fs_config header
gen := $(local-generated-sources-dir)/$(ANDROID_FS_CONFIG_H)
$(gen): PRIVATE_LOCAL_PATH := $(LOCAL_PATH)
$(gen): PRIVATE_TARGET_FS_CONFIG_GEN := $(TARGET_FS_CONFIG_GEN)
$(gen): PRIVATE_ANDROID_FS_HDR := $(system_android_filesystem_config)
$(gen): PRIVATE_CUSTOM_TOOL = $(PRIVATE_LOCAL_PATH)/fs_config_generator.py fsconfig --aid-header=$(PRIVATE_ANDROID_FS_HDR) $(PRIVATE_TARGET_FS_CONFIG_GEN) > $@
$(gen): $(TARGET_FS_CONFIG_GEN) $(system_android_filesystem_config) $(LOCAL_PATH)/fs_config_generator.py
$(transform-generated-source)
LOCAL_GENERATED_SOURCES := $(oem) $(gen)
my_fs_config_h := $(gen)
my_gen_oem_aid := $(oem)
gen :=
oem :=
endif
LOCAL_C_INCLUDES := $(dir $(my_fs_config_h)) $(dir $(my_gen_oem_aid))
include $(BUILD_HOST_EXECUTABLE)
fs_config_generate_bin := $(LOCAL_INSTALLED_MODULE)
##################################
# Generate the system/etc/fs_config_dirs binary file for the target
# Add fs_config_dirs to PRODUCT_PACKAGES in the device make file to enable
include $(CLEAR_VARS)
LOCAL_MODULE := fs_config_dirs
LOCAL_MODULE_CLASS := ETC
include $(BUILD_SYSTEM)/base_rules.mk
$(LOCAL_BUILT_MODULE): $(fs_config_generate_bin)
@mkdir -p $(dir $@)
$< -D -o $@
##################################
# Generate the system/etc/fs_config_files binary file for the target
# Add fs_config_files to PRODUCT_PACKAGES in the device make file to enable
include $(CLEAR_VARS)
LOCAL_MODULE := fs_config_files
LOCAL_MODULE_CLASS := ETC
include $(BUILD_SYSTEM)/base_rules.mk
$(LOCAL_BUILT_MODULE): $(fs_config_generate_bin)
@mkdir -p $(dir $@)
$< -F -o $@
ifneq ($(TARGET_FS_CONFIG_GEN),)
##################################
# Build the oemaid library when fs config files are present.
# Intentionally break build if you require generated AIDS
# header file, but are not using any fs config files.
include $(CLEAR_VARS)
LOCAL_MODULE := liboemaids
LOCAL_EXPORT_C_INCLUDE_DIRS := $(dir $(my_gen_oem_aid))
LOCAL_EXPORT_C_INCLUDE_DEPS := $(my_gen_oem_aid)
include $(BUILD_STATIC_LIBRARY)
##################################
# Generate the system/etc/passwd text file for the target
# This file may be empty if no AIDs are defined in
# TARGET_FS_CONFIG_GEN files.
include $(CLEAR_VARS)
LOCAL_MODULE := passwd
LOCAL_MODULE_CLASS := ETC
include $(BUILD_SYSTEM)/base_rules.mk
$(LOCAL_BUILT_MODULE): PRIVATE_LOCAL_PATH := $(LOCAL_PATH)
$(LOCAL_BUILT_MODULE): PRIVATE_TARGET_FS_CONFIG_GEN := $(TARGET_FS_CONFIG_GEN)
$(LOCAL_BUILT_MODULE): PRIVATE_ANDROID_FS_HDR := $(system_android_filesystem_config)
$(LOCAL_BUILT_MODULE): $(LOCAL_PATH)/fs_config_generator.py $(TARGET_FS_CONFIG_GEN) $(system_android_filesystem_config)
@mkdir -p $(dir $@)
$(hide) $< passwd --aid-header=$(PRIVATE_ANDROID_FS_HDR) $(PRIVATE_TARGET_FS_CONFIG_GEN) > $@
system_android_filesystem_config :=
endif
ANDROID_FS_CONFIG_H :=
my_fs_config_h :=
fs_config_generate_bin :=
my_gen_oem_aid :=
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