Add incomplete Minecraft 26.3 port prototype

scripts/smoke_server_263.sh

@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+# Disposable, headless smoke check for the incomplete 26.3 runtime Age backend.
+set -euo pipefail
+
+repo_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+smoke_dir=$(mktemp -d "${TMPDIR:-/tmp}/rivencraft-263-smoke.XXXXXX")
+server_dir="$smoke_dir/server"
+server_pid=
+input_fd=
+
+cleanup() {
+    if [[ -n "$server_pid" ]] && kill -0 "$server_pid" 2>/dev/null; then
+        if [[ -n "$input_fd" ]]; then printf 'stop\n' >&"$input_fd" || true; fi
+        wait "$server_pid" 2>/dev/null || true
+    fi
+    if [[ -n "$input_fd" ]]; then exec {input_fd}>&-; fi
+    rm -rf -- "$smoke_dir"
+}
+trap cleanup EXIT
+
+mkdir -p "$server_dir"
+printf 'eula=true\n' > "$server_dir/eula.txt"
+printf 'server-port=0\nonline-mode=false\nwhite-list=false\n' > "$server_dir/server.properties"
+
+wait_for_log() {
+    local log_file=$1 pattern=$2 seconds=$3
+    local tries=$((seconds * 4))
+    for ((i = 0; i < tries; i++)); do
+        if grep -Fq -- "$pattern" "$log_file" 2>/dev/null; then return 0; fi
+        if ! kill -0 "$server_pid" 2>/dev/null; then
+            printf 'Server exited before: %s\n' "$pattern" >&2
+            tail -80 "$log_file" >&2
+            return 1
+        fi
+        sleep 0.25
+    done
+    printf 'Timed out waiting for: %s\n' "$pattern" >&2
+    tail -80 "$log_file" >&2
+    return 1
+}
+
+start_server() {
+    local phase=$1
+    log_file="$smoke_dir/$phase.log"
+    fifo="$smoke_dir/$phase.stdin"
+    mkfifo "$fifo"
+    exec {input_fd}<>"$fifo"
+    "$repo_dir/gradlew" -p "$repo_dir/ports/mc263" runServer \
+        -PserverRunDir="$server_dir" --no-daemon < "$fifo" > "$log_file" 2>&1 &
+    server_pid=$!
+    wait_for_log "$log_file" 'Done (' 120
+}
+
+stop_server() {
+    printf 'stop\n' >&"$input_fd"
+    wait "$server_pid"
+    server_pid=
+    exec {input_fd}>&-
+    rm -- "$fifo"
+}
+
+send_and_wait() {
+    local command=$1 result=$2
+    printf '%s\n' "$command" >&"$input_fd"
+    wait_for_log "$log_file" "$result" 60
+}
+
+start_server first
+send_and_wait 'rivencraft_port compat' 'Registered biomes by namespace:'
+send_and_wait 'rivencraft_port age create smoke_alpha 123456789' 'Created rivencraft:age/smoke_alpha with seed 123456789'
+send_and_wait 'rivencraft_port age create smoke_beta 987654321' 'Created rivencraft:age/smoke_beta with seed 987654321'
+# The index must reach disk while the server is still running. A graceful
+# shutdown would hide the interrupted-save regression this checks.
+index_file="$server_dir/world/dimensions/minecraft/overworld/data/rivencraft/runtime_ages.dat"
+[[ -s "$index_file" ]] || {
+    printf 'Age index was not persisted before shutdown: %s\n' "$index_file" >&2
+    exit 1
+}
+gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_alpha'
+gzip -dc "$index_file" | strings | grep -Fq 'rivencraft:age/smoke_beta'
+send_and_wait 'rivencraft_port age sample smoke_alpha' 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain='
+send_and_wait 'rivencraft_port age sample smoke_beta' 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain='
+alpha_before=$(grep -F 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
+beta_before=$(grep -F 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
+if [[ "$alpha_before" == "$beta_before" ]]; then
+    printf 'Different Age seeds produced the same terrain probe: %s\n' "$alpha_before" >&2
+    exit 1
+fi
+stop_server
+
+start_server restart
+send_and_wait 'rivencraft_port age list' 'smoke_alpha'
+send_and_wait 'rivencraft_port age sample smoke_alpha' 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain='
+send_and_wait 'rivencraft_port age sample smoke_beta' 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain='
+alpha_after=$(grep -F 'rivencraft:age/smoke_alpha seed=123456789 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
+beta_after=$(grep -F 'rivencraft:age/smoke_beta seed=987654321 chunkOffset=0 terrain=' "$log_file" | tail -1 | sed 's/.*terrain=//')
+[[ "$alpha_before" == "$alpha_after" && "$beta_before" == "$beta_after" ]] || {
+    printf 'Age terrain changed across restart: %s/%s -> %s/%s\n' \
+        "$alpha_before" "$beta_before" "$alpha_after" "$beta_after" >&2
+    exit 1
+}
+stop_server
+printf '26.3 dedicated-server smoke passed: two distinct Ages persisted across restart.\n'