Clean staging dirs in build_image.py

build_image.py now accepts a --input-directory-filter-file argument
that contains a list of files to consider from the input directory.
A new, temporary input directory will be created, and only the
considered files will be copied to it.

This removes most of the need for `m installclean`, as old files or
files built manually will no longer end up on the partition.

Bug: 205632228
Test: Presubmits
Change-Id: I07e0bf8e840abf0b51a2fdf67b758905fb3c5b5b

Changes.md

@@ -1,4 +1,15 @@
-# Build System Changes for Android.mk Writers
+# Build System Changes for Android.mk/Android.bp Writers
+
+## Partitions are no longer affected by previous builds
+
+Partition builds used to include everything in their staging directories, and building an
+individual module will install it to the staging directory. Thus, previously, `m mymodule` followed
+by `m` would cause `mymodule` to be presinstalled on the device, even if it wasn't listed in
+`PRODUCT_PACKAGES`.
+
+This behavior has been changed, and now the partition images only include what they'd have if you
+did a clean build. This behavior can be disabled by setting the
+`BUILD_BROKEN_INCORRECT_PARTITION_IMAGES` environment variable or board config variable.
 
 ## Perform validation of Soong plugins
 
@@ -29,6 +40,7 @@ overridden by setting the `BUILD_BROKEN_USES_SOONG_PYTHON2_MODULES` product conf
 variable to `true`.
 
 Python 2 is slated for complete removal in V.
+
 ## Stop referencing sysprop_library directly from cc modules
 
 For the migration to Bazel, we are no longer mapping sysprop_library targets