update gradle to 5.6
dtbo parser: force use of python 2.7
add android libsparse utils
add sparse image parser: {system|vendor|product}.img
travis: upgrade to bionic(18.04 LTS)
details
- code refine
"In Kotlin 1.3, it is now possible to capture the when subject into variable"
- fix gradle version checking bug: now we can handle versions like "5.4-rc-1" and "5.4"
- removed unwanted import of "UnImplNode"
- add Struct3 doc
- avbtool only works with python 2.x, so systems which only have python
3.x as default will fail to run avbtool, fix it
- avbtool: sync with AOSP master
- avb salt: store salt for AVB signature, and use it in re-packing process
- ramdisk gzip: java.util.zip.GZIPOutputStream doesn't support parameters, so we use
org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream instead
- update mkbootimg: AOSP commit 147b355bb34cbd457a260c585be93193cef43b8e
- migrate all code from groovy to kotlin
- support DTBO and header_version, resolve#12
- upate README.expert.md too
- support AVB
cfig