Calibre binaries not viable

[richarji]

I have installed Calibre-web in Proxmox 8.3.2 using the Community Script from https://community-scripts.github.io/ProxmoxVE/scripts?id=calibre-web into a Privleged LXC container. No issues. It is running under Debian 12. Calibre-web is up an running with no errors.

I have installed Calibre 7.24.0 following the instructions at the Calibre Ebook download page.

On the Admin page for Calibre-web, I entered the path to the Calibre binaries (/opt/calibre) using the file picker.

When I attempt to Save, I receive the banner message "Calibre binaries are not viable"

From the shell I checked and I can run ebook-convert without any problems.

<<>>

root@calibre-web:/opt/calibre# ./ebook-convert --version
ebook-convert (calibre 7.24.0)
Created by: Kovid Goyal [email protected]

root@calibre-web:/opt/calibre# cat /var/log/calibre-web.log
[2025-01-21 17:31:40,996] INFO {cps.server:319} webserver stop (restart=True)
[2025-01-21 17:31:40,996] INFO {apscheduler.scheduler:212} Scheduler has been shut down
[2025-01-21 17:31:41,999] INFO {cps.server:301} Performing restart of Calibre-Web
[2025-01-21 17:31:42,769] INFO {cps:169} *** "greenlet" version does not meet the requirements. Should: <3.1.0, Found: 3.1.1, please consider installing required version ***
[2025-01-21 17:31:42,769] INFO {cps:178} Starting Calibre Web...
[2025-01-21 17:31:42,776] DEBUG {cps.services:26} Cannot import goodreads, showing authors-metadata will not work: No module named 'goodreads'
[2025-01-21 17:31:42,776] DEBUG {cps.services:34} Cannot import simpleldap, logging in with ldap will not work: No module named 'flask_simpleldap'
[2025-01-21 17:31:42,857] DEBUG {cps.services:49} Cannot import gmail, sending books via Gmail Oauth2 Verification will not work: No module named 'google_auth_oauthlib'
[2025-01-21 17:31:42,882] WARN {py.warnings:109} /usr/local/lib/python3.11/dist-packages/flask_limiter/extension.py:333: UserWarning: Using the in-memory storage for tracking rate limits as no storage was explicitly specified. This is not recommended for production use. See: https://flask-limiter.readthedocs.io#configuring-a-storage-backend for documentation about configuring the storage backend.
warnings.warn(

[2025-01-21 17:31:42,941] DEBUG {cps.gdriveutils:83} Cannot import pydrive, httplib2, using gdrive will not work: No module named 'pydrive'
[2025-01-21 17:31:43,144] INFO {apscheduler.scheduler:181} Scheduler started
[2025-01-21 17:31:43,145] INFO {apscheduler.scheduler:895} Added job "delete temp" to job store "default"
[2025-01-21 17:31:43,145] INFO {apscheduler.scheduler:895} Added job "end scheduled task" to job store "default"
[2025-01-21 17:31:43,145] INFO {apscheduler.scheduler:895} Added job "immediately delete temp" to job store "default"
[2025-01-21 17:31:43,146] INFO {apscheduler.executors.default:123} Running job "immediately delete temp (trigger: date[2025-01-21 17:31:43 EST], next run at: 2025-01-21 17:31:43 EST)" (scheduled at 2025-01-21 17:31:43.145632-05:00)
[2025-01-21 17:31:43,146] INFO {apscheduler.scheduler:641} Removed job e9aaa1fbd4884e78b5179af4938c06e5
[2025-01-21 17:31:43,147] DEBUG {cps.services.worker:91} Add Task for user: System - Clean up
[2025-01-21 17:31:43,147] INFO {apscheduler.executors.default:144} Job "immediately delete temp (trigger: date[2025-01-21 17:31:43 EST], next run at: 2025-01-21 17:31:43 EST)" executed successfully
[2025-01-21 17:31:43,148] DEBUG {cps.tasks.clean:43} Deleted expired session_keys
[2025-01-21 17:31:43,234] DEBUG {cps.comic:46} Cannot import comicapi, extracting comic metadata will not work: No module named 'comicapi'
[2025-01-21 17:31:43,235] DEBUG {cps.comic:53} Cannot import rarfile, extracting cover files from rar files will not work: No module named 'rarfile'
[2025-01-21 17:31:43,235] DEBUG {cps.comic:59} Cannot import py7zr, extracting cover files from CB7 files will not work: No module named 'py7zr'
[2025-01-21 17:31:43,291] DEBUG {cps.uploader:79} Cannot import mutagen, extracting audio metadata will not work: No module named 'mutagen'
[2025-01-21 17:31:43,312] DEBUG {cps.admin:83} Cannot import Flask-Dance, login with Oauth will not work: No module named 'flask_dance'
[2025-01-21 17:31:43,315] DEBUG {cps.gdrive:44} Cannot import googleapiclient, using GDrive will not work: No module named 'googleapiclient'
[2025-01-21 17:31:43,347] DEBUG {cps.search_metadata:61} Import error for metadata source: amazon - No module named 'bs4'
[2025-01-21 17:31:43,348] DEBUG {cps.search_metadata:61} Import error for metadata source: douban - No module named 'html2text'
[2025-01-21 17:31:43,348] DEBUG {cps.search_metadata:61} Import error for metadata source: lubimyczytac - No module named 'dateutil'
[2025-01-21 17:31:43,353] DEBUG {cps.search_metadata:61} Import error for metadata source: scholar - No module named 'scholarly'
[2025-01-21 17:31:43,441] INFO {cps.server:268} Starting Tornado server on :8083
[2025-01-21 17:32:02,248] ERROR {cps.admin:1894} Calibre binaries not viable
root@calibre-web:/opt/calibre#

Environment (please complete the following information):

• OS: Debian GNU/Linux 12 (bookworm)
• Python version: 3.11.2 (main, Nov 30 2024, 21:22:50) [GCC 12.2.0]
• Calibre-Web version: 0.6.24 - pyPi
• Docker container: [None]:
• Special Hardware: [Intel I7 / 48GB RAM / Proxmox 8.3.2 LXC Privleged Container / TrueNAS Scale ElectricEel-24.10.1 (Calibre database is accessed via an NFS share from TrueNAS
• Browser: [Firefox 134.0.1 (64-bit)]

The thing I don't understand is that the directory is selected using the folder picker in the Calibre-web app so for the binaries to be "non-viable", they must be failing some other, unspecified test?