add external modification check

app/src/main/java/com/geode/launcher/MainActivity.kt

@@ -38,6 +38,7 @@ import com.geode.launcher.ui.theme.Theme
 import com.geode.launcher.ui.theme.Typography
 import com.geode.launcher.utils.LaunchUtils
 import com.geode.launcher.utils.PreferenceUtils
+import com.geode.launcher.utils.ReleaseManager
 import com.geode.launcher.utils.useCountdownTimer
 import java.net.ConnectException
 import java.net.UnknownHostException
@@ -152,6 +153,14 @@ fun UpdateCard(releaseViewModel: ReleaseViewModel, modifier: Modifier = Modifier
             val message = when (state.exception) {
                 is UnknownHostException, is ConnectException ->
                     stringResource(R.string.release_fetch_no_internet)
+                is ReleaseManager.UpdateException -> {
+                    when (state.exception.reason) {
+                        ReleaseManager.UpdateException.Reason.EXTERNAL_FILE_IN_USE -> stringResource(
+                            R.string.release_fetch_manual_check_required
+                        )
+                        else -> state.exception.message
+                    }
+                }
                 else -> state.exception.message
             }
 

app/src/main/java/com/geode/launcher/utils/PreferenceUtils.kt

@@ -97,6 +97,7 @@ class PreferenceUtils(private val sharedPreferences: SharedPreferences) {
         CURRENT_VERSION_TIMESTAMP,
         THEME,
         BLACK_BACKGROUND,
+        CURRENT_RELEASE_MODIFIED,
     }
 
     private fun defaultValueForBooleanKey(key: Key): Boolean {
@@ -116,6 +117,7 @@ class PreferenceUtils(private val sharedPreferences: SharedPreferences) {
             Key.CURRENT_VERSION_TIMESTAMP -> "PreferenceCurrentVersionDescriptor"
             Key.THEME -> "PreferenceTheme"
             Key.BLACK_BACKGROUND -> "PreferenceBlackBackground"
+            Key.CURRENT_RELEASE_MODIFIED -> "PreferenceReleaseModified"
         }
     }
 

app/src/main/java/com/geode/launcher/utils/ReleaseManager.kt

@@ -9,7 +9,6 @@ import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.cancelAndJoin
-import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -58,6 +57,15 @@ class ReleaseManager private constructor(
         data class Finished(val hasUpdated: Boolean = false) : ReleaseManagerState()
     }
 
+    class UpdateException(reason: Reason? = null, cause: Throwable? = null) : Exception(reason?.name, cause) {
+        enum class Reason {
+            EXTERNAL_FILE_IN_USE
+        }
+
+        var reason: Reason? = reason
+            private set
+    }
+
     private var updateJob: Job? = null
 
     private val _uiState = MutableStateFlow<ReleaseManagerState>(ReleaseManagerState.Finished())
@@ -157,23 +165,34 @@ class ReleaseManager private constructor(
             return
         }
 
+        // check if the file was externally modified
+        val fileLastModified = sharedPreferences.getLong(PreferenceUtils.Key.CURRENT_RELEASE_MODIFIED)
+        if (fileLastModified != 0L && fileLastModified != geodeFile.lastModified()) {
+            sendError(UpdateException(UpdateException.Reason.EXTERNAL_FILE_IN_USE))
+            return
+        }
+
         performUpdate(release)
     }
 
-    private suspend fun updatePreferences(release: Release) {
-        coroutineScope {
-            val sharedPreferences = PreferenceUtils.get(applicationContext)
+    private fun updatePreferences(release: Release) {
+        val sharedPreferences = PreferenceUtils.get(applicationContext)
 
-            sharedPreferences.setString(
-                PreferenceUtils.Key.CURRENT_VERSION_TAG,
-                release.getDescription()
-            )
+        sharedPreferences.setString(
+            PreferenceUtils.Key.CURRENT_VERSION_TAG,
+            release.getDescription()
+        )
 
-            sharedPreferences.setLong(
-                PreferenceUtils.Key.CURRENT_VERSION_TIMESTAMP,
-                release.getDescriptor()
-            )
-        }
+        sharedPreferences.setLong(
+            PreferenceUtils.Key.CURRENT_VERSION_TIMESTAMP,
+            release.getDescriptor()
+        )
+
+        val outputFile = getGeodeOutputPath()
+        sharedPreferences.setLong(
+            PreferenceUtils.Key.CURRENT_RELEASE_MODIFIED,
+            outputFile.lastModified()
+        )
     }
 
     private fun getGeodeOutputPath(): File {

app/src/main/res/values/strings.xml

@@ -1,5 +1,5 @@
 <resources>
-    <string name="app_name">Geode</string>
+    <string name="app_name" translatable="false">Geode</string>
     <string name="no_activity_found">No activity found for this action.</string>
 
     <!-- MainActivity strings -->
@@ -30,6 +30,7 @@
     <string name="release_fetch_cancelled">Update cancelled.</string>
     <string name="release_fetch_button_retry">Retry</string>
     <string name="release_fetch_button_cancel">Cancel</string>
+    <string name="release_fetch_manual_check_required">Externally managed library in use, please manually check for updates if you want to overwrite it.</string>
 
     <!-- GeometryDashActivity strings -->
     <string name="message_box_cancel">Cancel</string>