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1. 文件：frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java中判斷Build.isBuildConsistent的值進行檢查
java
15411 public void systemReady(final Runnable goingCallback, TimingsTraceLog traceLog) { …… 5601 if (!Build.isBuildConsistent()) { 15602 Slog.e(TAG, "Build fingerprint is not consistent, warning user"); 15603 mUiHandler.obtainMessage(SHOW_FINGERPRINT_ERROR_UI_MSG).sendToTarget(); 15604 } ……
- isBuildConsistent函數在frameworks/base/core/java/android/os/Build.java中其中IS_TREBLE_ENABLED是進行兼容性判斷的關鍵判斷，這個值來自於屬性ro.treble.enabled。繼續查看發現 int result = VintfObject.verifyWithoutAvb();爲判斷設備兼容性的關鍵函數。
962 /** 963 * True if Treble is enabled and required for this device. 964 * 965 * @hide 966 */ 967 public static final boolean IS_TREBLE_ENABLED = 968 SystemProperties.getBoolean("ro.treble.enabled", false); 969 970 /** 971 * Verifies the current flash of the device is consistent with what 972 * was expected at build time. 973 * 974 * Treble devices will verify the Vendor Interface (VINTF). A device 975 * launched without Treble: 976 * 977 * 1) Checks that device fingerprint is defined and that it matches across 978 * various partitions. 979 * 2) Verifies radio and bootloader partitions are those expected in the build. 980 * 981 * @hide 982 */ 983 public static boolean isBuildConsistent() { 984 // Don't care on eng builds. Incremental build may trigger false negative. 985 if (IS_ENG) return true; 986 987 if (IS_TREBLE_ENABLED) { 988 // If we can run this code, the device should already pass AVB. 989 // So, we don't need to check AVB here. 990 int result = VintfObject.verifyWithoutAvb(); 991 992 if (result != 0) { 993 Slog.e(TAG, "Vendor interface is incompatible, error=" 994 + String.valueOf(result)); 995 } 996 997 return result == 0; 998 }
VintfObject.verifyWithoutAvb()----> frameworks/base/core/java/android/os/VintfObject.java---> public static native int verifyWithoutAvb();---> core/jni/android_os_VintfObject.cpp ---> {"verifyWithoutAvb", "()I", (void*)android_os_VintfObject_verifyWithoutAvb}, ----> static jint android_os_VintfObject_verifyWithoutAvb(JNIEnv* env, jclass) { ----> static jint verify(JNIEnv* env, jobjectArray packageInfo, android::vintf::DisabledChecks checks) {---> int32_t status = VintfObject::CheckCompatibility(cPackageInfo, &error, checks); VintfObject::CheckCompatibility函數成爲了關鍵函數，繼續排查發如今system/libvintf/VintfObject.cpp中， system/libvintf/VintfObject.cpp---> return details::checkCompatibility(xmls, false /* mount */, *details::gPartitionMounter, error,disabledChecks); ---> int32_t checkCompatibility(const std::vector<std::string>& xmls, bool mount,
此時checkCompatibility函數成爲了咱們的突破口，函數中的判斷髮現logcat中的關鍵打印：
"Runtime info and framework compatibility matrix are incompatible: "
在logcat中發現：
android
W VintfObject: VintfObject.verify() returns 1: Runtime info and framework compatibility matrix are incompatible: For config CONFIG_NFS_FS, value = y but required n E Build : Vendor interface is incompatible, error=1 E ActivityManager: Build fingerprint is not consistent, warning user
此時找到了關鍵問題點，就是CONFIG_NFS_FS的不該該爲Y應該爲N，可是這個是怎麼查找到的呢？ if (!updated.runtimeInfo->checkCompatibility(*updated.fwk.matrix, error, disabledChecks)) {----> RuntimeInfo.cpp -----> bool RuntimeInfo::checkCompatibility(const CompatibilityMatrix& mat, std::string* error, 如今發現，忽然沒了頭緒，想到了以前error信息： 「For config CONFIG_NFS_FS, value = y but required n」 這個判斷確定是RuntimeInfo::checkCompatibility函數中返回，因此搜了下發現繼續進行下去： if (!matchKernelConfigs(matrixKernel.conditions(), error)) { ---> bool RuntimeInfo::matchKernelConfigs(const std::vector<KernelConfig>& matrixConfigs, 在RuntimeInfo::matchKernelConfigs函數中找到了關鍵的錯誤信息打印，並找到對應的判斷： if (!matrixConfig.second.matchValue(kernelValue)) {
到這發現是對kernel的信息進行比對，可是信息從哪裏來呢？比對的信息又從哪裏來呢？陷入了僵局
進行長時間博客谷歌查找再google的介紹裏面找到了關鍵的兼容性介紹，連接以下：
https://source.android.google.cn/devices/architecture/vintf/match-rules#avb-version
其中內核匹配不就是咱們想要的信息：
bash
選擇適當的 部分後，對於值不爲 n 的每一個 項，咱們預計對應條目會存在於
/proc/config.gz 中；對於值爲 n 的每一個 項，咱們預計對應條目不會存在於 /proc/config.gz
中。咱們預計 的內容與等號後面的文本（包括引號）徹底匹配，直到換行符或 #，開頭和結尾的空格被截斷。
ide
這個config不就是咱們想要的信息；
在介紹的開始有一個信息的連接：
https://source.android.google.cn/devices/architecture/vintf/objects#runtime-collectible-information
這個連接裏面介紹了相關的清單，和信息來源，此時仍是懵逼，不過有個信息很重要：
函數
<!-- Comments, Legal notices, etc. here --> <manifest version="1.0" type="device" target-level="1"> <!-- hals ommited --> <kernel version="4.4.176"> <config> <key>CONFIG_ANDROID</key> <value>y</value> </config> <config> <key>CONFIG_ARM64</key> <value>y</value> </config> <!-- other configs ommited --> </kernel> </manifest>
可是此時我並無發現他的重要性，不過讓我知道了有這個列表，但是這個列表在哪呢？查找了源碼仍是一無所得
在system/libvintf目錄中搜索了下「kernel version」發現不通常了：
ui
test/vintf_object_tests.cpp文件中 1222 // 1223 // Set of framework matrices of different FCM version with <kernel>. 1224 // 1225 1226 #define FAKE_KERNEL(__version__, __key__) \ 1227 " <kernel version=\"" __version__ "\">\n" \ 1228 " <config>\n" \ 1229 " <key>CONFIG_" __key__ "</key>\n" \ 1230 " <value type=\"tristate\">y</value>\n" \ 1231 " </config>\n" \ 1232 " </kernel>\n" 當我看到FAKE_KERNEL定義的時候瞬間通透了，原來他是生成出來的，繼續往下看 1234 const static std::vector<std::string> systemMatrixKernelXmls = { 1235 // 1.xml 1236 "<compatibility-matrix version=\"1.0\" type=\"framework\" level=\"1\">\n" 1237 FAKE_KERNEL("1.0.0", "A1") 1238 FAKE_KERNEL("2.0.0", "B1") 1239 "</compatibility-matrix>\n", 1240 // 2.xml 1241 "<compatibility-matrix version=\"1.0\" type=\"framework\" level=\"2\">\n" 1242 FAKE_KERNEL("2.0.0", "B2") 1243 FAKE_KERNEL("3.0.0", "C2") 1244 FAKE_KERNEL("4.0.0", "D2") 1245 "</compatibility-matrix>\n", 1246 // 3.xml 1247 "<compatibility-matrix version=\"1.0\" type=\"framework\" level=\"3\">\n" 1248 FAKE_KERNEL("4.0.0", "D3") 1249 FAKE_KERNEL("5.0.0", "E3") 1250 "</compatibility-matrix>\n", 1251 };
經過這個發現了xml的關鍵節點，妥了，去編譯出來的文件中去查以前的錯誤CONFIG_NFS_FSthis
system/etc/vintf/compatibility_matrix.3.xml:972: <key>CONFIG_NFS_FS</key> system/etc/vintf/compatibility_matrix.3.xml:1758: <key>CONFIG_NFS_FS</key> system/etc/vintf/compatibility_matrix.3.xml:2552: <key>CONFIG_NFS_FS</key> system/etc/vintf/compatibility_matrix.2.xml:796: <key>CONFIG_NFS_FS</key> system/etc/vintf/compatibility_matrix.2.xml:1434: <key>CONFIG_NFS_FS</key> system/etc/vintf/compatibility_matrix.2.xml:2108: <key>CONFIG_NFS_FS</key> system/compatibility_matrix.xml:976: <key>CONFIG_NFS_FS</key> system/compatibility_matrix.xml:1762: <key>CONFIG_NFS_FS</key> system/compatibility_matrix.xml:2556: <key>CONFIG_NFS_FS</key>
這一瞬間，感受本身受到了極大的侮辱，原來如此；一切都通透了，一一匹配，對應而後查找
全部的配置中：
google
<config> <key>CONFIG_NFS_FS</key> <value type="tristate">n</value> </config>
報錯了，這下方便了，查找文件生成就行了：
繼續查找其中與kernel version匹配的配置，compatibility_matrix.2.xml最爲符合查找生成的位置：
hardware/interfaces/compatibility_matrices/Android.mk:
url
49 include $(CLEAR_VARS) 50 include $(LOCAL_PATH)/clear_vars.mk 51 LOCAL_MODULE := framework_compatibility_matrix.2.xml 52 LOCAL_MODULE_STEM := compatibility_matrix.2.xml 53 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM) 54 LOCAL_KERNEL_CONFIG_DATA_PATHS := \ 55 3.18.0:$(my_kernel_config_data)/o-mr1/android-3.18 \ 56 4.4.0:$(my_kernel_config_data)/o-mr1/android-4.4 \ 57 4.9.0:$(my_kernel_config_data)/o-mr1/android-4.9 \ 58 59 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
匹配找到對應的目錄，而後進行修改就完事了spa
感謝博客：https://blog.csdn.net/yekongzhongdexing/article/details/103961461 提供很重要的思路