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Merge "fs_config_generate: README"

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Change-Id: Id8cf39f5657640e099468abed741f0fa928a55f9
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Mark Salyzyn 2017-03-27 23:33:20 +00:00 committed by android-build-merger
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tools/fs_config/README
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@ -3,8 +3,7 @@
| _ <| __|| _ || | || \/ || __|
\__|\_/\_____/\__|__/|_____/\__ \__/\_____/
Generating the android_filesystem_config.h
Generating the android_filesystem_config.h:
To generate the android_filesystem_config.h file, one can choose from
one of two methods. The first method, is to declare
@ -140,3 +139,26 @@ $ nose2
To add new tests, simply add a test_<xxx> method to the test class. It will automatically
get picked up and added to the test suite.
Using the android_filesystem_config.h:
The tool fs_config_generate is built as a dependency to fs_config_dirs and
fs_config_files host targets, and #includes the above supplied or generated
android_filesystem_config.h file, and can be instructed to generate the binary
data that lands in the device target locations /system/etc/fs_config_dirs and
/system/etc/fs_config_files and in the host's ${OUT} locations
${OUT}/target/product/<device>/system/etc/fs_config_dirs and
${OUT}/target/product/<device>/system/etc/fs_config_files. The binary files
are interpreted by the libcutils fs_conf() function, along with the built-in
defaults, to serve as overrides to complete the results. The Target files are
used by filesystem and adb tools to ensure that the file and directory
properties are preserved during runtime operations. The host files in the
${OUT} directory are used in the final stages when building the filesystem
images to set the file and directory properties.
fs_config_generate --help reports:
Generate binary content for fs_config_dirs (-D) and fs_config_files (-F)
from device-specific android_filesystem_config.h override
Usage: fs_config_generate -D|-F [-o output-file]