Use a property instead of file to communicate cold boot done
Ueventd can't set properties currently, but this is an artificial
limitation, since ueventd communicates to init that it has finished
cold boot via a file, and init polls this file instead of returning to
the epoll loop, where properties are handled.
A related change replaces that file with a property and thus frees
ueventd to be able to set properties. This change creates the
cold_boot_done property type for this property and gives only ueventd
permissions to set it.
Bug: 62301678
Test: boot, check that properties are set
Change-Id: I40843b423b192ea841db6a82f648e5bab9738e0e
diff --git a/private/property_contexts b/private/property_contexts
index 85111a3..520383d 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -203,3 +203,6 @@
# Property for disabling NNAPI vendor extensions on product image (used on GSI /product image,
# which can't use NNAPI vendor extensions).
ro.nnapi.extensions.deny_on_product u:object_r:nnapi_ext_deny_product_prop:s0
+
+# Property that is set once ueventd finishes cold boot.
+ro.cold_boot_done u:object_r:cold_boot_done_prop:s0