Replace "sys.fuse_snapshot" with "persist.sys.fuse"

With the newly added flag for Settings developer options, which is now
used to change the state of FUSE, PROP_FUSE now acts as the snapshot
feature flag for the current boot.

Bug: 145391093
Test: atest AdoptableHostTest
Change-Id: I22363b088e88c764294cbd61c6d94160c907fae3

Utils.h

@@ -34,7 +34,7 @@ struct DIR;
 namespace android {
 namespace vold {
 
-static const char* kPropFuseSnapshot = "sys.fuse_snapshot";
+static const char* kPropFuse = "persist.sys.fuse";
 
 /* SELinux contexts used depending on the block device type */
 extern security_context_t sBlkidContext;

VolumeManager.cpp

@@ -374,7 +374,7 @@ int VolumeManager::forgetPartition(const std::string& partGuid, const std::strin
 }
 
 int VolumeManager::linkPrimary(userid_t userId) {
-    if (!GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
+    if (!GetBoolProperty(android::vold::kPropFuse, false)) {
         std::string source(mPrimary->getPath());
         if (mPrimary->isEmulated()) {
             source = StringPrintf("%s/%d", source.c_str(), userId);
@@ -468,7 +468,7 @@ int VolumeManager::onUserStarted(userid_t userId) {
         createEmulatedVolumesForUser(userId);
     }
 
-    if (!GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
+    if (!GetBoolProperty(android::vold::kPropFuse, false)) {
         // Note that sometimes the system will spin up processes from Zygote
         // before actually starting the user, so we're okay if Zygote
         // already created this directory.
@@ -563,7 +563,7 @@ static bool childProcess(const char* storageSource, const char* userSource, int
 }
 
 int VolumeManager::remountUid(uid_t uid, int32_t mountMode) {
-    if (GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
+    if (GetBoolProperty(android::vold::kPropFuse, false)) {
         // TODO(135341433): Implement fuse specific logic.
         return 0;
     }

model/EmulatedVolume.cpp

@@ -132,7 +132,7 @@ status_t EmulatedVolume::doMount() {
 
     dev_t before = GetDevice(mSdcardFsFull);
 
-    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
+    bool isFuse = base::GetBoolProperty(kPropFuse, false);
 
     // Mount sdcardfs regardless of FUSE, since we need it to bind-mount on top of the
     // FUSE volume for various reasons.

model/PublicVolume.cpp

@@ -223,7 +223,7 @@ status_t PublicVolume::doMount() {
     /* sdcardfs will have exited already. The filesystem will still be running */
     TEMP_FAILURE_RETRY(waitpid(sdcardFsPid, nullptr, 0));
 
-    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
+    bool isFuse = base::GetBoolProperty(kPropFuse, false);
     if (isFuse) {
         // We need to mount FUSE *after* sdcardfs, since the FUSE daemon may depend
         // on sdcardfs being up.