#!/usr/bin/env bash
# Fast installer for YAD Simple Installer (.sh) game packages.
# Streams the embedded archive with a modern multi-threaded decompressor
# instead of the single-threaded embedded zstd binary + double pv pipe.
#
# Usage:
# ysi-fast-install.sh <package.sh> [install_dir]
#
# install_dir defaults to the directory containing the .sh file.
# The game is extracted as: <install_dir>/<app_name>/
set -euo pipefail
usage() {
cat <<'EOF'
Usage: ysi-fast-install.sh <package.sh> [install_dir]
package.sh Path to a YAD Simple Installer self-extracting archive
install_dir Destination parent directory (default: same dir as package)
Example:
ysi-fast-install.sh "/Games/Crimson Desert.sh" /Games
EOF
exit "${1:-0}"
}
[[ "${1:-}" == "-h" || "${1:-}" == "--help" ]] && usage 0
[[ $# -ge 1 && $# -le 2 ]] || usage 1
PACKAGE=$(readlink -f "$1")
[[ -f "$PACKAGE" ]] || { echo "error: not a file: $1" >&2; exit 1; }
DEST_PARENT=$(readlink -f "${2:-$(dirname "$PACKAGE")}")
[[ -d "$DEST_PARENT" ]] || { echo "error: not a directory: ${2:-}" >&2; exit 1; }
[[ -w "$DEST_PARENT" ]] || { echo "error: no write permission: $DEST_PARENT" >&2; exit 1; }
need() { command -v "$1" >/dev/null || { echo "error: missing dependency: $1" >&2; exit 1; }; }
need tar
need xz
need dd
# --- parse YSI header metadata (first ~64KiB is enough) ---
HEADER=$(head -c 65536 "$PACKAGE" | tr -d '\0')
get_var() {
local name=$1
local val
val=$(printf '%s\n' "$HEADER" | grep -m1 -E "^${name}=" | head -n1) || true
val=${val#*=}
val=${val%\"}
val=${val#\"}
printf '%s' "$val"
}
APP=$(get_var app)
ARCSZ=$(get_var arcsz)
APPSZ=$(get_var appsz)
VER=$(get_var ver)
[[ -n "$APP" && -n "$ARCSZ" && "$ARCSZ" =~ ^[0-9]+$ ]] || {
echo "error: not a YSI package (missing app/arcsz in header)" >&2
exit 1
}
PKG_SIZE=$(stat -c%s "$PACKAGE")
OFFSET=$((PKG_SIZE - ARCSZ))
[[ $OFFSET -gt 0 && $OFFSET -lt $PKG_SIZE ]] || {
echo "error: invalid arcsz=$ARCSZ for file size $PKG_SIZE" >&2
exit 1
}
# Detect embedded archive format from magic bytes
MAGIC_HEX=$(dd if="$PACKAGE" iflag=skip_bytes,count_bytes skip="$OFFSET" count=6 status=none \
| od -An -tx1 | tr -d ' \n')
case "$MAGIC_HEX" in
fd377a585a00)
FMT=xz
DECOMP=(xz -T0 -d -c)
;;
28b52ffd*)
FMT=zstd
need zstd
DECOMP=(zstd -T0 -d -c)
;;
1f8b*)
FMT=gzip
need gzip
DECOMP=(gzip -d -c)
;;
*)
echo "error: unknown archive magic: $MAGIC_HEX" >&2
exit 1
;;
esac
DEST="$DEST_PARENT/$APP"
# Free-space check (APPSZ is expected unpacked bytes; keep ~2GiB margin)
if [[ -n "$APPSZ" && "$APPSZ" =~ ^[0-9]+$ ]]; then
AVAIL=$(stat -f --format='%a*%s' "$DEST_PARENT")
AVAIL=$((AVAIL))
NEED=$((APPSZ + 2147483648))
if (( AVAIL < NEED )); then
echo "error: not enough free space (need ~$((NEED / 1024**3)) GiB, have $((AVAIL / 1024**3)) GiB)" >&2
exit 1
fi
fi
if [[ -d "$DEST" ]] && [[ -n "$(ls -A "$DEST" 2>/dev/null || true)" ]]; then
read -r -p "'$DEST' already exists and is not empty. Continue? [y/N] " ans
[[ "$ans" == [yYдД]* ]] || { echo "cancelled."; exit 1; }
fi
mkdir -p "$DEST"
echo "Package : $PACKAGE"
echo "App : $APP${VER:+ ($VER)}"
echo "Format : $FMT (threaded decompress)"
echo "Archive : $((ARCSZ / 1024**3)) GiB compressed → $DEST"
echo
# Stream: seek to payload → progress → decompress → tar extract
# Avoids: embedded single-thread decompressor, double-pv pipe, temp arc.tar.* on disk
if command -v pv >/dev/null; then
dd if="$PACKAGE" iflag=skip_bytes,count_bytes skip="$OFFSET" count="$ARCSZ" status=none \
| pv -s "$ARCSZ" -N "$APP" \
| "${DECOMP[@]}" \
| tar -x -C "$DEST_PARENT"
else
dd if="$PACKAGE" iflag=skip_bytes,count_bytes skip="$OFFSET" count="$ARCSZ" status=none \
| "${DECOMP[@]}" \
| tar -x -C "$DEST_PARENT"
fi
echo
echo "Done: $DEST"
[[ -x "$DEST/start" ]] && echo "Launch: \"$DEST/start\""
