Fix for the Minecraft FTB Egg #94
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gOOvER
reviewed
Sep 19, 2025
gOOvER
suggested changes
Sep 19, 2025
parkervcp
requested changes
Dec 8, 2025
| "scripts": { | ||
| "installation": { | ||
| "script": "#!/bin/bash\r\n# FTB Modpack Installation Script\r\n\r\nset -e\r\n\r\n#\r\nreadonly SERVERFILE_DIR=\"/mnt/server\"\r\nreadonly FTB_API_URL=\"https://api.feed-the-beast.com/v1/modpacks/public/modpack\"\r\n\r\n# Ensure server directory exists\r\nmkdir -p \"${SERVERFILE_DIR}\"\r\ncd \"${SERVERFILE_DIR}\"\r\n\r\necho \"Starting FTB modpack installation...\"\r\n\r\n# Install required dependencies\r\ninstall_dependencies() {\r\n echo \"Installing dependencies...\"\r\n apt-get update -qq\r\n apt-get install -y curl jq\r\n}\r\n\r\n# URL encode function for search terms\r\nurl_encode() {\r\n local string=\"${1// /%20}\"\r\n echo \"$string\"\r\n}\r\n\r\n# Resolve modpack ID from search term\r\nresolve_modpack_id() {\r\n if [[ -z \"${FTB_MODPACK_ID}\" && -n \"${FTB_SEARCH_TERM}\" ]]; then\r\n echo \"Resolving modpack ID from search term: ${FTB_SEARCH_TERM}\"\r\n local encoded_term=$(url_encode \"$FTB_SEARCH_TERM\")\r\n local search_url=\"https://api.modpacks.ch/public/modpack/search/8?term=${encoded_term}\"\r\n \r\n FTB_MODPACK_ID=$(curl -sSL \"$search_url\" | jq -r \".packs[0]\")\r\n \r\n if [[ \"${FTB_MODPACK_ID}\" == \"null\" || -z \"${FTB_MODPACK_ID}\" ]]; then\r\n echo \"Error: Could not find modpack with search term '${FTB_SEARCH_TERM}'\"\r\n exit 1\r\n fi\r\n \r\n echo \"Found modpack ID: ${FTB_MODPACK_ID}\"\r\n fi\r\n}\r\n\r\n# Resolve version ID from version string\r\nresolve_version_id() {\r\n if [[ -z \"${FTB_MODPACK_VERSION_ID}\" && -n \"${FTB_VERSION_STRING}\" ]]; then\r\n echo \"Resolving version ID from version string: ${FTB_VERSION_STRING}\"\r\n \r\n local api_url=\"${FTB_API_URL}/${FTB_MODPACK_ID}\"\r\n local api_data=$(curl -sSL \"$api_url\" 2>/dev/null || echo \"null\")\r\n \r\n if [[ \"$api_data\" != \"null\" ]] && echo \"$api_data\" | jq -e '.status == \"success\"' >/dev/null 2>&1; then\r\n FTB_MODPACK_VERSION_ID=$(echo \"$api_data\" | jq -r --arg version \"${FTB_VERSION_STRING}\" '.versions[] | select(.name == $version) | .id')\r\n fi\r\n \r\n if [[ \"${FTB_MODPACK_VERSION_ID}\" == \"null\" || -z \"${FTB_MODPACK_VERSION_ID}\" ]]; then\r\n echo \"Error: Could not find version '${FTB_VERSION_STRING}' for modpack ID ${FTB_MODPACK_ID}\"\r\n exit 1\r\n fi\r\n \r\n echo \"Found version ID: ${FTB_MODPACK_VERSION_ID}\"\r\n fi\r\n}\r\n\r\n# Download and execute modpack installer\r\ninstall_modpack() {\r\n local installer_arch=$([ \"$(uname -m)\" == \"x86_64\" ] && echo \"linux\" || echo \"arm/linux\")\r\n \r\n echo \"Installing modpack...\"\r\n echo \"Modpack ID: ${FTB_MODPACK_ID}\"\r\n echo \"Version ID: ${FTB_MODPACK_VERSION_ID}\"\r\n echo \"Architecture: ${installer_arch}\"\r\n \r\n # Clean up old forge/neoforge files\r\n rm -rf libraries/net/minecraftforge/forge\r\n rm -rf libraries/net/neoforged/forge\r\n rm -f unix_args.txt\r\n \r\n # Download and run installer using FTB API\r\n local api_url=\"${FTB_API_URL}/${FTB_MODPACK_ID}/${FTB_MODPACK_VERSION_ID}/server/${installer_arch}\"\r\n local http_code=$(curl -o /dev/null -s -w \"%{http_code}\" \"$api_url\")\r\n \r\n if [[ \"$http_code\" == \"200\" ]]; then\r\n echo \"Downloading installer from FTB API\"\r\n curl -L \"$api_url\" --output serversetup\r\n chmod +x ./serversetup\r\n ./serversetup -pack \"${FTB_MODPACK_ID}\" -version \"${FTB_MODPACK_VERSION_ID}\" -auto -force\r\n else\r\n echo \"Error: FTB API returned HTTP $http_code for installer download\"\r\n echo \"URL: $api_url\"\r\n exit 1\r\n fi\r\n}\r\n\r\n# Setup startup files and symlinks for Pelican Panel startup command\r\nsetup_startup_files() {\r\n echo \"Setting up startup files...\"\r\n \r\n # Create symlinks for unix_args.txt (priority order)\r\n for path in \"libraries/net/minecraftforge/forge/*/unix_args.txt\" \\\r\n \"libraries/net/neoforged/neoforge/*/unix_args.txt\" \\\r\n \"libraries/net/fabricmc/fabric-loader/*/unix_args.txt\"; do\r\n if compgen -G \"$path\" >/dev/null; then\r\n ln -sf $path unix_args.txt\r\n break\r\n fi\r\n done\r\n \r\n # Move modloader jar to standard name (priority order)\r\n for pattern in \"forge-*.jar\" \"neoforge-*.jar\" \"fabric-*.jar\"; do\r\n if compgen -G \"$pattern\" >/dev/null; then\r\n mv $pattern start-server.jar\r\n break\r\n fi\r\n done\r\n}\r\n\r\n# Clean up installation files\r\ncleanup_installation() {\r\n echo \"Cleaning up installation files...\"\r\n rm -f serversetup run.bat\r\n}\r\n\r\n# Main installation flow\r\nmain() {\r\n echo \"=== FTB Modpack Installation ===\"\r\n echo \"Modpack ID: ${FTB_MODPACK_ID:-'(to be resolved)'}\"\r\n echo \"Version ID: ${FTB_MODPACK_VERSION_ID:-'(to be resolved)'}\"\r\n echo \"Search Term: ${FTB_SEARCH_TERM:-'(not set)'}\"\r\n echo \"Version String: ${FTB_VERSION_STRING:-'(not set)'}\"\r\n echo \"================================\"\r\n \r\n install_dependencies\r\n resolve_modpack_id\r\n resolve_version_id\r\n install_modpack\r\n setup_startup_files\r\n cleanup_installation\r\n \r\n echo \"=== Installation Complete ===\"\r\n}\r\n\r\n# Execute main function\r\nmain", | ||
| "container": "openjdk:8-jdk-slim", |
Contributor
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Sorry it's taken so long to look at this.
We need to update the install images because the openjdk images were removed.
You can use ghcr.io/pelican-eggs/installers:java_8
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Description
The FTB API has changed and as such, the current egg does not work correctly. I have done the following to fix this:
I am aware that there already is a PR that is supposed to fix this but it didn't work for me without additional changes and it seems to be abandoned. As a result, I tried fixing it myself.
This updated Egg has been tested with the following modpacks on Pelican + Pterodactyl:
I am not sure about the Log4J fixes. Some of the older modpacks with older Java versions still download the Log4J fix jar but the new ones do not. The problem is that if the jar is not downloaded (on newer packs), the startup command won't work correctly. Not sure how to handle this. I'd suggest a startup script that checks if the jar exists and adjusts the startup command accordingly.
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