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Document how APEXes are identified in the boot jar variables.

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Test: n/a - comment changes only
Bug: 191269918
Change-Id: I5ccb5afb6bef5fa5af9d528dd1d6ffd555448d9a
This commit is contained in:
Martin Stjernholm
2021-07-05 20:33:42 +01:00
parent a56be7d781
commit 1d51ea951e
1 changed files with 12 additions and 3 deletions
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15
java/dexpreopt_bootjars.go
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@@ -154,9 +154,18 @@ import (
// PRODUCT_BOOT_JARS_EXTRA variables. The AOSP makefiles specify some common Framework libraries,
// but more product-specific libraries can be added in the product makefiles.
//
// Each component of the PRODUCT_BOOT_JARS and PRODUCT_BOOT_JARS_EXTRA variables is either a simple
// name (if the library is a part of the Platform), or a colon-separated pair <apex, name> (if the
// library is a part of a non-updatable APEX).
// Each component of the PRODUCT_BOOT_JARS and PRODUCT_BOOT_JARS_EXTRA variables is a
// colon-separated pair <apex>:<library>, where <apex> is the variant name of a non-updatable APEX,
// "platform" if the library is a part of the platform in the system partition, or "system_ext" if
// it's in the system_ext partition.
//
// In these variables APEXes are identified by their "variant names", i.e. the names they get
// mounted as in /apex on device. In Soong modules that is the name set in the "apex_name"
// properties, which default to the "name" values. For example, many APEXes have both
// com.android.xxx and com.google.android.xxx modules in Soong, but take the same place
// /apex/com.android.xxx at runtime. In these cases the variant name is always com.android.xxx,
// regardless which APEX goes into the product. See also android.ApexInfo.ApexVariationName and
// apex.apexBundleProperties.Apex_name.
//
// A related variable PRODUCT_UPDATABLE_BOOT_JARS contains bootclasspath libraries that are in
// updatable APEXes. They are not included in the boot image.