Add expert option to save logs

app/src/main/AndroidManifest.xml

@@ -54,6 +54,16 @@
     <!-- Used to authenticate saving a new recovery code -->
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
 
+    <!-- This is needed to query content providers in other users -->
+    <uses-permission
+        android:name="android.permission.INTERACT_ACROSS_USERS_FULL"
+        tools:ignore="ProtectedPermissions" />
+
+    <!-- Used to get logcat for system part of backup API, gets permission dialog -->
+    <uses-permission
+        android:name="android.permission.READ_LOGS"
+        tools:ignore="ProtectedPermissions" />
+
     <!-- Permission used to open settings -->
     <permission
         android:name="com.stevesoltys.seedvault.OPEN_SETTINGS"
@@ -64,11 +74,6 @@
         android:name="com.stevesoltys.seedvault.RESTORE_BACKUP"
         android:protectionLevel="system|signature" />
 
-    <!-- This is needed to query content providers in other users -->
-    <uses-permission
-        android:name="android.permission.INTERACT_ACROSS_USERS_FULL"
-        tools:ignore="ProtectedPermissions" />
-
     <application
         android:name=".App"
         android:allowBackup="false"

app/src/main/java/com/stevesoltys/seedvault/settings/ExpertSettingsFragment.kt

@@ -1,15 +1,35 @@
 package com.stevesoltys.seedvault.settings
 
 import android.os.Bundle
+import androidx.activity.result.contract.ActivityResultContracts.CreateDocument
+import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import com.stevesoltys.seedvault.R
 import com.stevesoltys.seedvault.permitDiskReads
+import com.stevesoltys.seedvault.transport.backup.PackageService
+import org.koin.android.ext.android.inject
+import org.koin.androidx.viewmodel.ext.android.sharedViewModel
 
 class ExpertSettingsFragment : PreferenceFragmentCompat() {
+
+    private val viewModel: SettingsViewModel by sharedViewModel()
+    private val packageService: PackageService by inject()
+    // TODO set mimeType when upgrading androidx lib
+    private val createFileLauncher = registerForActivityResult(CreateDocument()) { uri ->
+        viewModel.onLogcatUriReceived(uri)
+    }
+
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         permitDiskReads {
             setPreferencesFromResource(R.xml.settings_expert, rootKey)
         }
+        findPreference<Preference>("logcat")?.setOnPreferenceClickListener {
+            val versionName = packageService.getVersionName(requireContext().packageName) ?: "ver"
+            val timestamp = System.currentTimeMillis()
+            val name = "seedvault-$versionName-$timestamp.txt"
+            createFileLauncher.launch(name)
+            true
+        }
     }
 
     override fun onStart() {

app/src/main/java/com/stevesoltys/seedvault/settings/SettingsViewModel.kt

@@ -11,6 +11,7 @@ import android.net.Network
 import android.net.NetworkCapabilities
 import android.net.NetworkRequest
 import android.net.Uri
+import android.os.Process.myUid
 import android.provider.Settings
 import android.util.Log
 import android.widget.Toast
@@ -35,8 +36,11 @@ import com.stevesoltys.seedvault.ui.RequireProvisioningViewModel
 import com.stevesoltys.seedvault.ui.notification.BackupNotificationManager
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.calyxos.backup.storage.api.StorageBackup
 import org.calyxos.backup.storage.backup.BackupJobService
+import java.io.IOException
+import java.lang.Runtime.getRuntime
 import java.util.concurrent.TimeUnit.HOURS
 
 private const val TAG = "SettingsViewModel"
@@ -233,4 +237,28 @@ internal class SettingsViewModel(
         BackupJobService.cancelJob(app)
     }
 
+    fun onLogcatUriReceived(uri: Uri?) = viewModelScope.launch(Dispatchers.IO) {
+        if (uri == null) {
+            onLogcatError()
+            return@launch
+        }
+        // 1000 is system uid, needed to get backup logs from the OS code.
+        val command = "logcat -d --uid=1000,${myUid()} *:V"
+        try {
+            app.contentResolver.openOutputStream(uri, "wt")?.use { outputStream ->
+                getRuntime().exec(command).inputStream.use { inputStream ->
+                    inputStream.copyTo(outputStream)
+                }
+            } ?: throw IOException("OutputStream was null")
+        } catch (e: Exception) {
+            Log.e(TAG, "Error saving logcat ", e)
+            onLogcatError()
+        }
+    }
+
+    private suspend fun onLogcatError() = withContext(Dispatchers.Main) {
+        val str = app.getString(R.string.settings_expert_logcat_error)
+        Toast.makeText(app, str, LENGTH_LONG).show()
+    }
+
 }

app/src/main/res/drawable/ic_bug_report.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M20,8h-2.81c-0.45,-0.78 -1.07,-1.45 -1.82,-1.96L17,4.41 15.59,3l-2.17,2.17C12.96,5.06 12.49,5 12,5c-0.49,0 -0.96,0.06 -1.41,0.17L8.41,3 7,4.41l1.62,1.63C7.88,6.55 7.26,7.22 6.81,8L4,8v2h2.09c-0.05,0.33 -0.09,0.66 -0.09,1v1L4,12v2h2v1c0,0.34 0.04,0.67 0.09,1L4,16v2h2.81c1.04,1.79 2.97,3 5.19,3s4.15,-1.21 5.19,-3L20,18v-2h-2.09c0.05,-0.33 0.09,-0.66 0.09,-1v-1h2v-2h-2v-1c0,-0.34 -0.04,-0.67 -0.09,-1L20,10L20,8zM14,16h-4v-2h4v2zM14,12h-4v-2h4v2z" />
+</vector>

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

@@ -46,6 +46,9 @@
     <string name="settings_expert_title">Expert settings</string>
     <string name="settings_expert_quota_title">Unlimited app quota</string>
     <string name="settings_expert_quota_summary">Do not impose a limitation on the size of app backups.\n\nWarning: This can fill up your storage location quickly. Not needed for most apps.</string>
+    <string name="settings_expert_logcat_title">Save app log</string>
+    <string name="settings_expert_logcat_summary">Developers can diagnose bugs with these logs.\n\nWarning: The log file might contain personally identifiable information. Review before and delete after sharing!</string>
+    <string name="settings_expert_logcat_error">Error: Could not save app log</string>
 
     <!-- Storage Location -->
     <string name="storage_fragment_backup_title">Choose where to store backups</string>

app/src/main/res/xml/settings_expert.xml

@@ -5,4 +5,9 @@
         android:key="unlimited_quota"
         android:summary="@string/settings_expert_quota_summary"
         android:title="@string/settings_expert_quota_title" />
+    <Preference
+        android:icon="@drawable/ic_bug_report"
+        android:key="logcat"
+        android:summary="@string/settings_expert_logcat_summary"
+        android:title="@string/settings_expert_logcat_title" />
 </PreferenceScreen>