{"record":{"id":"cfb27943f06eeeda","repo":"MuntashirAkon/AppManager","slug":"could-not-create-staging-files","errorCode":null,"errorMessage":"Could not create staging files","messagePattern":"Could not create staging files","errorType":"exception","errorClass":"BackupException","httpStatus":null,"severity":"error","filePath":"app/src/main/java/io/github/muntashirakon/AppManager/backup/RestoreOp.java","lineNumber":349,"sourceCode":"            }\n        } catch (IOException e) {\n            throw new BackupException(\"Could not create package staging directory\", e);\n        }\n        synchronized (sLock) {\n            // Setup apk files, including split apk\n            final int splitCount = mBackupMetadata.splitConfigs.length;\n            String[] allApkNames = new String[splitCount + 1];\n            Path[] allApks = new Path[splitCount + 1];\n            try {\n                Path baseApk = packageStagingDirectory.createNewFile(mBackupMetadata.apkName, null);\n                allApks[0] = baseApk;\n                allApkNames[0] = mBackupMetadata.apkName;\n                for (int i = 1; i < allApkNames.length; ++i) {\n                    allApkNames[i] = mBackupMetadata.splitConfigs[i - 1];\n                    allApks[i] = packageStagingDirectory.createNewFile(allApkNames[i], null);\n                }\n            } catch (IOException e) {\n                throw new BackupException(\"Could not create staging files\", e);\n            }\n            // Decrypt sources\n            try {\n                backupSourceFiles = mBackupItem.decrypt(backupSourceFiles);\n            } catch (IOException e) {\n                throw new BackupException(\"Failed to decrypt \" + Arrays.toString(backupSourceFiles), e);\n            }\n            // Extract apk files to the package staging directory\n            try {\n                TarUtils.extract(mBackupInfo.tarType, backupSourceFiles, packageStagingDirectory, allApkNames, null, null);\n            } catch (Throwable th) {\n                throw new BackupException(\"Failed to extract the apk file(s).\", th);\n            }\n            // A normal update will do it now\n            InstallerOptions options = InstallerOptions.getDefault();\n            options.setInstallerName(mBackupMetadata.installer);\n            options.setUserId(mUserId);\n            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {","sourceCodeStart":331,"sourceCodeEnd":367,"githubUrl":"https://github.com/MuntashirAkon/AppManager/blob/0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5/app/src/main/java/io/github/muntashirakon/AppManager/backup/RestoreOp.java#L331-L367","documentation":"RestoreOp.restoreApkFiles creates placeholder APK/split-APK files in a package staging directory before decrypting and extracting the backup's tar archives. This error means creating one of those staging files (via createNewFile on packageStagingDirectory) threw an IOException. AppManager wraps it in a BackupException to abort the restore of the APK payload.","triggerScenarios":"packageStagingDirectory.createNewFile() fails for apkName or any of splitConfigs: staging dir missing/deleted, no write permission, storage full, or the encrypted backup file name list references an unwritable location.","commonSituations":"Device storage full; staging dir removed between cleanup and creation; root/privilege loss so the staging path is read-only; corrupted metadata causing invalid file names (e.g. empty or path-containing split config names).","solutions":["Free up storage space on the device/partition holding the staging directory.","Verify the package staging directory exists and is writable before the loop (recreate it if deleted).","Check that backup metadata apkName/splitConfigs are non-empty and contain no path separators.","Re-create the backup if its metadata is corrupted; retry the restore with proper root privileges."],"exampleFix":"// before\nallApks[i] = packageStagingDirectory.createNewFile(allApkNames[i], null);\n// after\nif (!packageStagingDirectory.exists()) throw new BackupException(\"Staging dir missing\");\nPath staged = packageStagingDirectory.createNewFile(allApkNames[i], null);\nif (staged == null) throw new BackupException(\"Could not create staging file: \" + allApkNames[i]);\nallApks[i] = staged;","handlingStrategy":"try-catch","validationCode":"if (!packageStagingDirectory.exists()) throw new IOException(\"Staging dir missing\");\nif (packageStagingDirectory.getFreeSpace() < requiredBytes) throw new IOException(\"Insufficient space\");","typeGuard":"boolean isWritableDir(Path d) { return d != null && d.isDirectory() && d.canWrite(); }","tryCatchPattern":"try { apk = staging.createNewFile(name, null); if (apk == null) throw new IOException(\"createNewFile returned null for \" + name); } catch (IOException e) { throw new BackupException(\"Could not create staging files\", e); }","preventionTips":["Check staging directory existence and writability before creating files","Monitor free storage before starting a restore","Sanitize apkName/splitConfigs against nulls and path separators","Retry the restore once after transient I/O failures"],"tags":["android","filesystem","backup-restore"],"backgroundTag":"file-write-failed","analyzedSha":"0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5","analyzedAt":"2026-09-12T14:03:37.243Z","contentChangedAt":"2026-09-12T14:03:37.243Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}