feat(perf): add one-step tier setup script for existing players
Default Options only seeds configs when absent, so existing players never
got the tuned settings. build.py --ship now also writes the Deck/Mid/High
tier files to config/onion-perf/<tier>/, and onion-perf-setup.{sh,ps1,bat}
(installed into the instance folder) backs up and replaces the tier's
config files and merges only the tuned video keys into options.txt,
keeping keybinds, audio and vsync/max-FPS choices.
PLAYER-TUNING: point players at the script; bench B4 GC verdict (G1 for
everyone; ZGC/Shenandoah tested worse); 16 GB PCs 5-6 GB heap.
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#!/bin/sh
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# Onion MC: apply a performance tier's tuned settings to this instance.
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#
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# sh onion-perf-setup.sh [deck|mid|high] [--yes]
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#
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# Run it from (or point it at) the instance's game folder - the one that holds
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# config/ and options.txt; this script lives there after a pack update.
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# Close Minecraft first. Every file it changes is backed up to
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# onion-perf-backup/<date-time>/ first. options.txt is merged key by key: only the
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# tier's video keys change; keybinds, audio, resource packs etc. are left alone.
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# No network access. Windows: double-click onion-perf-setup.bat instead.
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die() { echo "error: $*" >&2; exit 1; }
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case "$0" in
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*/*) GAME=$(cd "${0%/*}" && pwd) || die "cannot find the script's folder" ;;
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*) GAME=$(pwd) ;;
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esac
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TIER=""
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YES=0
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for a in "$@"; do
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case "$a" in
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deck|mid|high) [ -z "$TIER" ] || die "more than one tier given"; TIER=$a ;;
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-y|--yes) YES=1 ;;
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-h|--help) sed -n '2,11p' "$0" | sed 's/^# \{0,1\}//'; exit 0 ;;
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*) die "unknown argument '$a' (use: deck | mid | high, optionally --yes)" ;;
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esac
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done
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PERF="$GAME/config/onion-perf"
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[ -d "$PERF/mid" ] || die "$PERF not found. Update the modpack first (it ships these
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settings), and run this script from the instance's game folder."
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INTERACTIVE=0
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[ -t 0 ] && INTERACTIVE=1
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if [ -z "$TIER" ]; then
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if [ "$INTERACTIVE" = 1 ]; then
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cat <<'EOF'
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Which tier fits this machine?
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deck Steam Deck, handheld, laptop/integrated graphics
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mid GTX 1060 / RX 580 class (~6 GB VRAM), 4-6 core CPU [pack default]
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high 8 GB+ VRAM graphics card (GTX 1080 Ti, RTX 3060 and up)
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EOF
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printf 'Tier [mid]: '
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read -r TIER || TIER=""
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[ -n "$TIER" ] || TIER=mid
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case "$TIER" in deck|mid|high) ;; *) die "unknown tier '$TIER'" ;; esac
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else
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TIER=mid
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fi
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fi
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SRC="$PERF/$TIER"
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[ -d "$SRC" ] || die "$SRC not found. Update the modpack first."
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if [ "$YES" != 1 ]; then
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[ "$INTERACTIVE" = 1 ] || die "not running interactively: close Minecraft, then re-run with --yes"
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printf 'Is Minecraft closed? [y/N]: '
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read -r ans || ans=""
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case "$ans" in y|Y|yes|YES|Yes) ;; *) echo "Close Minecraft and run this again."; exit 1 ;; esac
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fi
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STAMP=$(date +%Y%m%d-%H%M%S)
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BACKUP="$GAME/onion-perf-backup/$STAMP"
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n=1
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while [ -e "$BACKUP" ]; do BACKUP="$GAME/onion-perf-backup/$STAMP-$n"; n=$((n + 1)); done
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mkdir -p "$BACKUP" || die "cannot create $BACKUP"
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backup() { # backup <path relative to the game dir>, if it exists
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[ -f "$GAME/$1" ] || return 0
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case "$1" in */*) mkdir -p "$BACKUP/${1%/*}" || die "cannot create backup folder" ;; esac
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cp -p "$GAME/$1" "$BACKUP/$1" || die "cannot back up $1"
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}
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LIST=$(mktemp "${TMPDIR:-/tmp}/onion-perf.XXXXXX") || die "mktemp failed"
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REPORT=$(mktemp "${TMPDIR:-/tmp}/onion-perf.XXXXXX") || die "mktemp failed"
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trap 'rm -f "$LIST" "$REPORT"' EXIT
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(cd "$SRC" && find config -type f) | sort > "$LIST" || die "cannot list $SRC"
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replaced=0
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unchanged=0
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echo "Applying tier '$TIER' to $GAME"
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while IFS= read -r rel; do
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if [ -f "$GAME/$rel" ] && cmp -s "$SRC/$rel" "$GAME/$rel"; then
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unchanged=$((unchanged + 1))
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continue
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fi
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backup "$rel"
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case "$rel" in */*) mkdir -p "$GAME/${rel%/*}" || die "cannot create folder for $rel" ;; esac
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cp "$SRC/$rel" "$GAME/$rel" || die "cannot write $rel"
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echo " replaced $rel"
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replaced=$((replaced + 1))
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done < "$LIST"
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OPT="$GAME/options.txt"
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if [ ! -f "$SRC/options.txt" ]; then
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echo " (tier has no options.txt)"
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elif [ ! -f "$OPT" ]; then
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echo " options.txt not found: skipped (Default Options seeds it on first launch)"
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else
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TMP="$OPT.onion-perf.tmp"
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awk -v rep="$REPORT" '
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NR == FNR {
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sub(/\r$/, "")
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i = index($0, ":")
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if (i == 0) next
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k = substr($0, 1, i - 1)
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if (k == "version" || k == "maxFps" || k == "enableVsync") next
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if (!(k in want)) order[++n] = k
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want[k] = substr($0, i + 1)
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next
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}
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{
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cr = ""
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if (sub(/\r$/, "")) { cr = "\r"; crlf = 1 }
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i = index($0, ":")
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if (i > 0) {
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k = substr($0, 1, i - 1)
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if ((k in want) && !(k in done)) {
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v = substr($0, i + 1)
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if (v != want[k]) print " " k ": " v " -> " want[k] > rep
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print k ":" want[k] cr
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done[k] = 1
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next
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}
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}
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print $0 cr
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}
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END {
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for (j = 1; j <= n; j++) {
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k = order[j]
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if (!(k in done)) {
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print " " k ": (unset) -> " want[k] > rep
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print k ":" want[k] (crlf ? "\r" : "")
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}
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}
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}
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' "$SRC/options.txt" "$OPT" > "$TMP" || { rm -f "$TMP"; die "cannot merge options.txt"; }
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if [ -s "$REPORT" ]; then
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backup options.txt
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mv "$TMP" "$OPT" || die "cannot write options.txt"
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echo " options.txt keys changed:"
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cat "$REPORT"
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else
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rm -f "$TMP"
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echo " options.txt: already matches the tier"
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fi
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fi
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if [ -z "$(ls -A "$BACKUP")" ]; then
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rmdir "$BACKUP"
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BACKUP="(nothing changed, no backup needed)"
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fi
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echo "Done: tier '$TIER'; $replaced file(s) replaced, $unchanged already up to date."
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echo "Backup: $BACKUP"
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echo "Also set Java memory in your launcher (5 GB is enough): see PLAYER-TUNING.md section 2."
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