Added a way to easy fixing JD installation.

Dockerfile

@@ -44,6 +44,8 @@ RUN \
         jq \
         # We need a font.
         ttf-dejavu \
+        # For fixing JD installation.
+        curl \
         # For ffmpeg and ffprobe tools.
         ffmpeg \
         # For rtmpdump tool.

README.md

@@ -52,6 +52,8 @@ your valuable time every day!
    * [MyJDownloader](#myjdownloader)
       * [Direct Connection](#direct-connection)
    * [Click'n'Load](#clicknload)
+   * [Troubleshooting](#troubleshooting)
+      * [JDownloader Fails to Start](#jdownloader-fails-to-start)
    * [Support or Contact](#support-or-contact)
 
 ## Quick Start
@@ -644,6 +646,24 @@ JDownloader via the *MyJDownloader* service.
 [Click'n'Load]: http://jdownloader.org/knowledge/wiki/glossary/cnl2
 [MyJDownloader browser extension]: https://my.jdownloader.org/apps/
 
+## Troubleshooting
+
+### JDownloader Fails to Start
+
+If JDownloader displays an error indicating that it is unable to start,
+following these instruction might help fixing the problem.
+
+1. Create the file `.fix_jd_install`, under the directory that has been mapped
+   to `/config`. The content of the file is not important. However, if the
+   latest JDownloader installer is required, setting the content to `download`
+   causes the installer to be downloaded.
+2. Restart the container.
+
+The presence of the file causes the container to attempt fixing the installation
+during its startup. The repair process follows the instructions provided at:
+
+https://support.jdownloader.org/en/knowledgebase/article/fix-jdownloader-installation
+
 ## Support or Contact
 
 Having troubles with the container or have questions?  Please

appdefs.yml

@@ -68,6 +68,24 @@ app:
 
           [Click'n'Load]: http://jdownloader.org/knowledge/wiki/glossary/cnl2
           [MyJDownloader browser extension]: https://my.jdownloader.org/apps/
+      - title: Troubleshooting
+        level: 2
+      - title: JDownloader Fails to Start
+        level: 3
+        content: |-
+          If JDownloader displays an error indicating that it is unable to start,
+          following these instruction might help fixing the problem.
+
+          1. Create the file `.fix_jd_install`, under the directory that has been mapped
+             to `/config`. The content of the file is not important. However, if the
+             latest JDownloader installer is required, setting the content to `download`
+             causes the installer to be downloaded.
+          2. Restart the container.
+
+          The presence of the file causes the container to attempt fixing the installation
+          during its startup. The repair process follows the instructions provided at:
+
+          https://support.jdownloader.org/en/knowledgebase/article/fix-jdownloader-installation
   changelog:
     - version: 24.08.1
       date: 2024-08-02

rootfs/etc/cont-init.d/55-jdownloader2.sh

@@ -6,12 +6,42 @@ set -u # Treat unset variables as an error.
 # Make sure mandatory directories exist.
 mkdir -p /config/logs
 
-# Set default configuration on new install.
-if [ ! -f /config/JDownloader.jar ]; then
-    cp /defaults/JDownloader.jar /config/
-    cp -r /defaults/cfg /config/
+# Fix installation if requested.
+# https://support.jdownloader.org/en/knowledgebase/article/fix-jdownloader-installation
+if [ -f /config/.fix_jd_install ]; then
+    TO_REMOVE="
+        Core.Jar
+        JDownloader.jar
+        tmp
+        update
+    "
+
+    echo "fixing JDownloader installation..."
+    echo "$TO_REMOVE" | while read -r FILE; do
+        [ -n "$FILE" ] || continue
+        echo "removing /config/$FILE..."
+        rm -rf /config/"$FILE"
+    done
+
+    if [ "$(cat /config/.fix_jd_install)" = "download" ]; then
+        JDOWNLOADER_URL=http://installer.jdownloader.org/JDownloader.jar
+        echo "downloading JDownloader installer..."
+        if curl -s -L --show-error --fail --max-time 120 -o /tmp/JDownloader.jar.download "$JDOWNLOADER_URL"
+        then
+            mv /tmp/JDownloader.jar.download /config/JDownloader.jar
+        else
+            echo "failed to download JDownloader installer."
+        fi
+    fi
+
+    echo "installation fix done."
+    rm /config/.fix_jd_install
 fi
 
+# Set default configuration on new install.
+[ -f /config/JDownloader.jar ] || cp -v /defaults/JDownloader.jar /config/JDownloader.jar
+[ -d /config/cfg ] || cp -rv /defaults/cfg /config/cfg
+
 # Set MyJDownloader credentials.
 if [ -n "${MYJDOWNLOADER_EMAIL:-}" ] && [ -n "${MYJDOWNLOADER_PASSWORD:-}" ]
 then