Use snapshot value sys.fuse_snapshot instead of persist.sys.fuse

This will allow us to receive values from server flags and store them in
persist.sys.fuse without risking flag consistency during a boot.

Test: manual - flip persist.sys.fuse both ways and make sure FuseDaemon
works as expected.
Bug: 140803239

Change-Id: I839a1973c98b4eda982226d20be48d1c08e7464a

Utils.h

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

VolumeManager.cpp

@@ -382,7 +382,7 @@ int VolumeManager::forgetPartition(const std::string& partGuid, const std::strin
 }
 
 int VolumeManager::linkPrimary(userid_t userId) {
-    bool isFuse = GetBoolProperty(android::vold::kPropFuse, false);
+    bool isFuse = GetBoolProperty(android::vold::kPropFuseSnapshot, false);
 
     if (isFuse) {
         // Here we have to touch /mnt/user/userid>/<volumeid> which was already mounted as part of
@@ -464,7 +464,7 @@ int VolumeManager::setPrimary(const std::shared_ptr<android::vold::VolumeBase>&
 }
 
 int VolumeManager::remountUid(uid_t uid, int32_t mountMode) {
-    if (GetBoolProperty(android::vold::kPropFuse, false)) {
+    if (GetBoolProperty(android::vold::kPropFuseSnapshot, false)) {
         // TODO(135341433): Implement fuse specific logic.
         return 0;
     }

model/EmulatedVolume.cpp

@@ -84,7 +84,7 @@ status_t EmulatedVolume::doMount() {
 
     dev_t before = GetDevice(mFuseFull);
 
-    bool isFuse = base::GetBoolProperty(kPropFuse, false);
+    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
 
     if (isFuse) {
         LOG(INFO) << "Mounting emulated fuse volume";
@@ -150,7 +150,7 @@ status_t EmulatedVolume::doUnmount() {
     // error code and might cause broken behaviour in applications.
     KillProcessesUsingPath(getPath());
 
-    bool isFuse = base::GetBoolProperty(kPropFuse, false);
+    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
     if (isFuse) {
         // We could have migrated storage to an adopted private volume, so always
         // call primary storage "emulated" to avoid media rescans.

model/PublicVolume.cpp

@@ -169,7 +169,7 @@ status_t PublicVolume::doMount() {
 
     dev_t before = GetDevice(mFuseFull);
 
-    bool isFuse = base::GetBoolProperty(kPropFuse, false);
+    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
 
     if (isFuse) {
         LOG(INFO) << "Mounting public fuse volume";
@@ -245,7 +245,7 @@ status_t PublicVolume::doUnmount() {
     // error code and might cause broken behaviour in applications.
     KillProcessesUsingPath(getPath());
 
-    bool isFuse = base::GetBoolProperty(kPropFuse, false);
+    bool isFuse = base::GetBoolProperty(kPropFuseSnapshot, false);
     if (isFuse) {
         // Use UUID as stable name, if available
         std::string stableName = getId();