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86 lines
3.3 KiB
86 lines
3.3 KiB
4 months ago
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// Copyright (C) 2020 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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//
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#include <inttypes.h>
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#include <sys/utsname.h>
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#include <android-base/stringprintf.h>
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#include <android-base/logging.h>
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#include <kver/kernel_release.h>
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#include <kver/utils.h>
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namespace android::kver {
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bool IsKernelUpdateValid(const std::optional<KernelRelease>& old_kernel_release,
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const std::optional<KernelRelease>& new_kernel_release) {
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// Allow update from non-GKI to non-GKI for legacy devices, or non-GKI to GKI for retrofit
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// devices.
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if (!old_kernel_release.has_value()) {
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LOG(INFO) << "Current build does not contain GKI, permit update to \""
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<< (new_kernel_release.has_value() ? new_kernel_release->string() : "")
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<< "\" anyways.";
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return true;
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}
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if (!new_kernel_release.has_value()) {
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LOG(ERROR) << "Cannot update from GKI \"" << old_kernel_release->string()
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<< "\" to non-GKI build.";
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return false;
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}
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// Check that KMI version does not downgrade; i.e. the tuple(w, x, z, k) does
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// not decrease.
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if (old_kernel_release->kmi_version().tuple() > new_kernel_release->kmi_version().tuple()) {
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LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to "
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<< new_kernel_release->string() << ": KMI version decreases.";
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return false;
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}
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// This ensures that Android release does not downgrade, e.g. you cannot go
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// from 5.10-android13-0 to 5.15-android12-0.
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if (old_kernel_release->android_release() > new_kernel_release->android_release()) {
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LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to "
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<< new_kernel_release->string() << ": Android release decreases.";
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return false;
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}
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// This ensures that w.x.y does not downgrade; e.g. you cannot go
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// from 5.4.43 to 5.4.42, but you can go from 5.4.43 to 5.10.5.
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if (old_kernel_release->kernel_version_tuple() > new_kernel_release->kernel_version_tuple()) {
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LOG(ERROR) << "Cannot update from " << old_kernel_release->string() << " to "
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<< new_kernel_release->string() << ": Kernel version decreases.";
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return false;
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}
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LOG(INFO) << "Allow to update from " << old_kernel_release->string() << " to "
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<< new_kernel_release->string();
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return true;
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}
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// Keep in sync with kmi.go.
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std::string GetApexName(const KmiVersion& kmi_version) {
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static constexpr const char* KMI_VERSION_APEX_NAME_FORMAT{
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"com.android.gki.kmi_%" PRIu64 "_%" PRIu64 "_android%" PRIu64 "_%" PRIu64};
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return android::base::StringPrintf(KMI_VERSION_APEX_NAME_FORMAT, kmi_version.version(), kmi_version.patch_level(),
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kmi_version.android_release(), kmi_version.generation());
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}
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uint64_t GetFactoryApexVersion() {
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return 300000000;
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}
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} // namespace android::kver
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