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#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
VERSION="1.21.8"
function update_metadata {
printf 'updating version manifest\n'
mkdir -p versions
curl --silent "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json" | jq '{"latest": .latest, "versions": [.versions[] | {"key": .id, "value": .url}] | from_entries}' > versions/manifest.json
printf 'updating %s meta %s\n' "$VERSION"
mkdir -p "versions/$VERSION"
curl --silent -o "versions/$VERSION/meta.json" "$(jq -r --arg version "$VERSION" '.versions[$version]' versions/manifest.json)"
meta="$(jq -c --slurpfile info info.json --slurpfile auth auth.json -f meta.jq "versions/$VERSION/meta.json")"
printf 'updating %s asset index...\n' "$VERSION"
mkdir -p assets/indexes
assets_url="$(<<<"$meta" jq -r '.asset_index')"
curl --silent -o "assets/indexes/$(basename "$assets_url")" "$assets_url"
}
function launch {
update_metadata
function download_library {
if ! [[ -e "${2:-}" ]]; then
printf '%s\n' "${1:-}"
mkdir -p "$(dirname "${2:-}")"
curl --silent -o "${2:-}" "${3:-}"
fi
}
export -f download_library
function download_asset {
if ! [[ -e "assets/objects/${2:-}" ]]; then
printf '%s\n' "${1:-}"
mkdir -p "$(dirname "assets/objects/${2:-}")"
curl --silent -o "assets/objects/${2:-}" "https://resources.download.minecraft.net/${2:-}"
fi
}
export -f download_asset
#TODO: check hash
if ! [[ -e "versions/$VERSION/client.jar" ]]; then
printf 'downloading %s client jar...\n' "$VERSION"
<<<"$meta" jq -r '.client_url' | xargs curl --silent -o "versions/$VERSION/client.jar"
fi
printf 'downloading libraries...\n'
<<<"$meta" jq -r '.libraries[] | "\(.name) libraries/\(.path) \(.url)"' | xargs -I {} "$SHELL" -c "download_library {}"
printf 'downloading assets...\n'
jq -r '.objects | to_entries[] | "\(.key) \(.value.hash[:2])/\(.value.hash)"' "assets/indexes/$(basename "$assets_url")" | xargs -P 10 -I {} "$SHELL" -c "download_asset {}"
# if ! [[ -e "versions/$VERSION/log4j.xml" ]]; then
# printf 'downloading %s log4j config...\n' "$VERSION"
# <<<"$meta" jq -r '.logging_config' | xargs curl --silent -o "versions/$VERSION/log4j.xml"
# fi
printf 'starting game :3\n'
<<<"$meta" jq -r '.args.jvm + [.main_class] + .args.game | join(" ")' | xargs java
}
launch
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