d721e870bc
This CL adds a number of changes to make the assignment of system
properties to be less confusing.
1. Added `a ?= b` syntax, which is called optional prop assignments. The
prop `a` gets the value `b` only when there is no non-optional prop
assignment for `a` such as `a = c`. This is useful for props that
provide some reasonable default values as fallback.
2. With the introduction of the optional prop assignment syntax,
duplicated non-optional assignments is prohibited; e.g., the follwing
now triggers a build-time error:
a = b
a = c
, but the following doesn't:
a ?= b
a = c
Note that the textual order between the optional and non-optional
assignments doesn't matter. The non-optional assignment eclipses the
optional assignment even when the former appears 'before' the latter.
a = c
a ?= b
In the above, `a` gets the value `c`
When there are multiple optional assignments without a non-optional
assignments as shown below, the last one wins:
a ?= b
a ?= c
`a` becomes `c`. Specifically, the former assignment is commented out
and the latter is converted to a non-optional assignment.
3. post_process_props.py is modified so that when a prop assignment is
deleted, changed, or added, the changes are recorded as comments. This
is to aid debugging. Previously, it was often difficult to find out why
a certain sysprop assignment is missing or is added.
4. post_process_prop.py now has a unittest
Bug: 117892318
Bug: 158735147
Test: atest --host post_process_prop_unittest
Exempt-From-Owner-Approval: cherry-pick from master
Merged-In: I9c073a21c8257987cf2378012cadaeeeb698a4fb
(cherry picked from commit 7aeb8de74e)
Change-Id: I9c073a21c8257987cf2378012cadaeeeb698a4fb
59 lines
1.3 KiB
Plaintext
59 lines
1.3 KiB
Plaintext
// Copyright (C) 2019 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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python_binary_host {
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name: "generate-self-extracting-archive",
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srcs: ["generate-self-extracting-archive.py"],
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version: {
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py2: {
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enabled: true,
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},
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py3: {
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enabled: false,
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},
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},
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}
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python_binary_host {
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name: "post_process_props",
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srcs: ["post_process_props.py"],
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version: {
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py2: {
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enabled: false,
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},
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py3: {
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enabled: true,
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},
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},
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}
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python_test_host {
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name: "post_process_props_unittest",
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main: "test_post_process_props.py",
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srcs: [
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"post_process_props.py",
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"test_post_process_props.py",
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],
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version: {
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py2: {
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enabled: false,
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},
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py3: {
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enabled: true,
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},
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},
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test_config: "post_process_props_unittest.xml",
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test_suites: ["general-tests"],
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}
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