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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.testutils
import com.android.tradefed.invoker.TestInformation
import com.android.tradefed.targetprep.BaseTargetPreparer
/**
* A target preparer that disables DeviceConfig sync while running a test.
*
* Without this preparer, tests that rely on stable values of DeviceConfig flags, for example to
* test behavior when setting the flag and resetting it afterwards, may flake as the flags may
* be synced with remote servers during the test.
*/
class DisableConfigSyncTargetPreparer : BaseTargetPreparer() {
private var syncDisabledOriginalValue = "none"
override fun setUp(testInfo: TestInformation) {
if (isDisabled) return
syncDisabledOriginalValue = readSyncDisabledOriginalValue(testInfo)
// The setter is the same in current and legacy S versions
testInfo.exec("cmd device_config set_sync_disabled_for_tests until_reboot")
}
override fun tearDown(testInfo: TestInformation, e: Throwable?) {
if (isTearDownDisabled) return
// May fail harmlessly if called before S
testInfo.exec("cmd device_config set_sync_disabled_for_tests $syncDisabledOriginalValue")
}
private fun readSyncDisabledOriginalValue(testInfo: TestInformation): String {
return when (val reply = testInfo.exec("cmd device_config get_sync_disabled_for_tests")) {
"until_reboot", "persistent", "none" -> reply
// Reply does not match known modes, try legacy commands used on S and some T builds
else -> when (testInfo.exec("cmd device_config is_sync_disabled_for_tests")) {
// The legacy command just said "true" for "until_reboot" or "persistent". There is
// no way to know which one was used, so just reset to "until_reboot" to be
// conservative.
"true" -> "until_reboot"
else -> "none"
}
}
}
}
private fun TestInformation.exec(cmd: String) = this.device.executeShellCommand(cmd)
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