Support relative key path in VerifiedBootVersion2VerityImageBuilder

Otatools archive can be unpacked to an arbitrary directory together
with bundled external/avb/test/data keys. Calling add_img_to_target_files
from a different directory fails to build an image which has
avb_{}_key_path pointing to the bundled key since add_hash_footer
can't find the key file.

Fix this by applying the same logic as in common.AppendAVBSigningArgs.

Steps to reproduce:
$ . build/envsetup.sh && lunch aosp_cf_arm64_phone-userdebug && make dist
$ cd out/dist && rm -rf otatools && unzip otatools.zip -d otatools
$ zip -d aosp_cf_arm64_phone-*target_files*.zip IMAGES/system_other.img
$ otatools/bin/add_img_to_target_files -a -v -p otatools \
    aosp_cf_arm64_phone-target_files-*.zip

Bug: 218531463
Test: manual, see "steps to reproduce" above
Change-Id: Id3f7cf2678e998ef1beda2b6741944c6455c2404
1 file changed
tree: 59da0879197c047a63a63953232c7e75271a8cc6
  1. common/
  2. core/
  3. packaging/
  4. target/
  5. tests/
  6. tools/
  7. .gitignore
  8. banchanHelp.sh
  9. buildspec.mk.default
  10. Changes.md
  11. CleanSpec.mk
  12. Deprecation.md
  13. envsetup.sh
  14. help.sh
  15. METADATA
  16. navbar.md
  17. OWNERS
  18. PREUPLOAD.cfg
  19. rbesetup.sh
  20. README.md
  21. tapasHelp.sh
  22. Usage.txt
README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.