Problem: - I can't upload my APK file with repomaker to my Git storage. This only effects the Flatpak version - the Docker version is uneffected. It seems that the background task executor faces an error and retries again (and fails again). ``` INFO:background_task.tasks:Running repomaker.tasks.update_repo DEBUG:root:Processing ffupdater-release.apk INFO:androguard.apk:Starting analysis on AndroidManifest.xml INFO:androguard.apk:APK file was successfully validated! DEBUG:androguard.core.api_specific_resources:Available API levels: 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28 WARNING:androguard.core.api_specific_resources:Requested API level 30 is larger than maximum we have, returning API level 28 instead. DEBUG:androguard.core.api_specific_resources:Available API levels: 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28 DEBUG:root:Getting signature of ffupdater-release.apk WARNING:root:Using Java's jarsigner, not recommended for verifying APKs! Use apksigner DEBUG:root:JAR signature verified: repo/ffupdater-release.apk INFO:root:Creating signed index with this key (SHA256): INFO:root:16 B0 C1 96 28 E7 C9 F7 8C E1 97 85 90 9A 1D F6 AD B7 C5 A9 34 8E 0E E2 5D 71 50 10 67 35 C9 B5 DEBUG:root:Directory: repo DEBUG:root:> jar cf index.jar index.xml ERROR:background_task.tasks:Rescheduling repomaker.tasks.update_repo Traceback (most recent call last): File "/app/lib/python3.7/site-packages/fdroidserver/common.py", line 2278, in FDroidPopenBytes stderr=stderr_param) File "/usr/lib/python3.7/subprocess.py", line 775, in __init__ restore_signals, start_new_session) File "/usr/lib/python3.7/subprocess.py", line 1522, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] No such file or directory: 'jar': 'jar' ``` How to reproduce: - Install the Flatpak version of repomaker (explained in https://gitlab.com/fdroid/repomaker/#flatpak) - Create repository in repomaker - Add storage - Add APK file - Watch the error/debug messages in the terminal Effects versions: - Freshly installed Ubuntu 20.04.2 LTS in Virtual Box - Manjaro Linux - KDE Plasma Version: 5.22.5 - KDE Frameworks Version: 5.86.0 - Qt Version: 5.15.2 - Kernel Version: 5.14.7-2-MANJARO (64-bit) - Graphics Platform: X11 Solution: - Use the docker verison of repomaker https://gitlab.com/fdroid/repomaker/-/tree/master/docker#docker-compose-deployment I know that little work is currently being done on the project. This bug report is intended for the next users so that they do not spend hours looking for the solution.