tree 952cdd73cefa3be7554e35dc2e9651b3054b7c29
parent d0430bfe6e08f932fa15b159457a5430f5b3ec25
author Neil Fuller <nfuller@google.com> 1552490195 +0000
committer Neil Fuller <nfuller@google.com> 1552925285 +0000

Add support for ANDROID_TZDATA_ROOT

Soon, code in the Android Core Library / ICU4C library will depend on the
ANDROID_TZDATA_ROOT environment variable being set. On device this points
to the root of the com.android.tzdata module.

Unlike ANDROID_RUNTIME_ROOT, ANDROID_TZDATA_ROOT it doesn't have to point to
anything that exists because the code will fall back to looking in
ANDROID_RUNTIME_ROOT if it can't find the files it is looking for. Most
of the changes in this commit are plumbing to make sure the environment
variable is set to benign defaults or passed through to the runtime.

This commit has been put together by looking for usages of
ANDROID_RUNTIME_ROOT and duplicating the logic.

Bug: 128422035
Test: build only
Change-Id: I2fd73fe16f5022742aaf634be158765cac8759e6