Previously, Android used its own cil_write_ast function to output the
resulting AST. libsepol now defines a similar function named
cil_write_build_ast. The new function differs slightly in behaviour:
* It will output "source information" nodes in the resulting CIL. When
loading, it is expected that each source information line (e.g.,
`;;* lms 100 file.cil`) will be matched with a terminating entry (e.g.,
`;;* lme`). If not, the loading will fail. Because we split and merge
policy files in AOSP, explicitly ignore these lines when writing the
AST.
* genfscon paths are now quoted following 644c5bb.
* An extra superfluous set of parentheses was previously added for some
operators (e.g., "range" "and" or "not").
For typeattributes, cil_write_build_ast uses the `fqn` field and not
`name`. Ensure the nodes are correctly populated.
Bug: 190808996
Test: Build aosp_bramble-userdebug and manually compare the generated
/{system,vendor,product}/etc/selinux* files with their previous
versions. The differences are due to the new behaviours described
above.
Test: Force a recompilation of the policy on device, the new policy is
correctly loaded.
Change-Id: I088d1e94ca07cfbd0b6c604f1f82464b3537c392
3342f74ef8