Add DevControlBot garage: skeleton bot with release/debug build script
A minimal Tank Royale bot that boots and stands still. Body, gun and radar are set to white once at init (team convention: white = not programmed yet); the tick loop only calls go(). - DevControlBot/ holds the single bot module, its metadata JSON, the BotLauncher entry script and the nimble file - DevControlBot.sh is a thin wrapper around the runBot nimble task: release build by default, --debug for the classic diagnostic build - dependencies resolve at run time from the global nimble store via `nimble path`; optional .env (gitignored) supplies env vars such as SERVER_URL, with existing environment variables taking precedence - build happens in a throwaway mktemp dir removed on exit; no artifacts
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# Package
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version = "0.1.0"
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author = "Davide Cappellini"
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description = "DevControlBot — control-skeleton bot that does nothing but show up bright"
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license = "MIT"
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srcDir = "."
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bin = @[]
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# Dependencies
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# Installed globally with `nimble install`; nothing is vendored locally and
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# no nimble.paths / vendor/ is used. `runBot` resolves each package's real
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# location at run time with `nimble path` and passes explicit --path: flags,
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# so the build does not rely on $HOME or on the compiler's bundled nimblepath.
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requires "nim >= 2.0.0"
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requires "robocode_tankroyale_botapi >= 1.0.7"
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requires "jsony >= 1.1.5"
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# The build-and-run logic lives here, not in DevControlBot.sh.
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#
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# NimScript cannot install signal handlers, so the temp build dir is owned by a
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# small POSIX shell program (below) that Nimble executes via `exec` (which goes
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# through the shell). That program traps EXIT/INT/TERM and always removes the
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# throwaway build dir, including when compilation fails or the run is
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# interrupted. Nothing is ever written to a persistent out/ directory.
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#
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# `exec` turns ANY non-zero exit into a NimScript exception, which prints a
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# stack trace plus an escaped copy of the whole script. That is nonsense for the
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# expected "no game server on 7654" outcome. So the shell always exits 0 and
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# hands the real code back through the file named by $DEVCONTROLBOT_STATUS_FILE,
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# which DevControlBot.sh exports and then re-exits with. Direct `nimble runBot`
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# (no such variable) keeps the old behaviour: the shell exits with the real code
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# and Nimble raises.
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#
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# DevControlBot.sh is a thin wrapper: it locates itself, chdirs here so Nimble
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# finds this file, forwards caller args, calls `runBot` and forwards signals.
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import std/os
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const
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runScript = """
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# Resolve the globally-installed dependencies at run time. Plain `nim c` only
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# finds them when $HOME is set (the Nim distribution's nim.cfg carries
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# `nimblepath="$home/.nimble/pkgs2/"`), which is NOT true in bare environments
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# (env -i, nix build sandboxes, CI). `nimble path` is the reliable,
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# cwd-independent way to ask for their real location.
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# Distinct exit codes, so a caller can tell the failure modes apart.
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EXIT_NO_SERVER=1 # bot could not connect to the game server (expected)
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EXIT_NO_DEPS=2 # a dependency is not installed
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EXIT_COMPILE=3 # compilation failed
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STATUS_FILE="${DEVCONTROLBOT_STATUS_FILE:-}"
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# report <code>: write the real exit code to the status file. Returns 1 when
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# there is no status file, i.e. the caller wants it as the shell's own code.
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report() {
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[ -n "$STATUS_FILE" ] || return 1
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printf '%s\n' "$1" > "$STATUS_FILE"
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}
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# die <code>: finish with <code> as the run's real result — quietly (exit 0,
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# the status file carries the code) or, with no listener, by exiting with it.
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die() {
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if report "$1"; then exit 0; else exit "$1"; fi
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}
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DEPS=""
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for pkg in robocode_tankroyale_botapi jsony; do
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pkgdir="$(nimble path "$pkg" 2>/dev/null | head -n 1)"
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if [ -z "$pkgdir" ] || [ ! -d "$pkgdir" ]; then
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echo "[devcontrolbot] COMPILE BLOCKED: dependency '$pkg' is not installed." >&2
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echo "[devcontrolbot] fix with: nimble install $pkg" >&2
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die $EXIT_NO_DEPS
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fi
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echo "[devcontrolbot] dependency $pkg -> $pkgdir"
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DEPS="$DEPS '--path:$pkgdir'"
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done
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# Build mode: $DEVCONTROLBOT_DEBUG is set to "debug" by DevControlBot.sh when
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# the caller passed --debug; anything else (including an unset variable, i.e. a
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# direct `nimble runBot`) means release. Release is the quiet default.
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BUILD_MODE="${DEVCONTROLBOT_DEBUG:-release}"
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BUILD_DIR="$(mktemp -d "${TMPDIR:-/tmp}/devcontrolbot.XXXXXX")"
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BINARY="$BUILD_DIR/DevControlBot"
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# ---- optional .env ------------------------------------------------------------
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# Configuration reaches the bot through the ENVIRONMENT, not through any code
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# of ours: robocode_tankroyale_botapi's start() reads SERVER_URL and
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# SERVER_SECRET (robocode_tankroyale_botapi.nim:424-425, documented at :396-397)
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# and loadBotInfo() reads BOT_NAME / BOT_VERSION / ... from the environment when
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# the JSON is absent (bot_info.nim:117-130). That is the documented, supported
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# mechanism the official BotLauncher uses, so the only thing we do here is make
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# those variables PRESENT in the bot's process environment for local runs.
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#
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# Loaded HERE, in the runBot task, and not in DevControlBot.sh, so it applies both
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# to `./DevControlBot.sh` and to a direct `nimble runBot` (one implementation, and
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# the wrapper stays a thin wrapper).
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# - optional: a missing file is not an error, nothing is printed but a note,
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# the bot just uses the API defaults.
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# - CRLF-tolerant: CRs are stripped so a Windows-edited file does not end up
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# with the value "bar\r".
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# - both `FOO=bar` and `export FOO=bar` styles.
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# - never echoed, never `set -x`: only the file NAME is reported.
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# - $DEVCONTROLBOT_ENV_FILE overrides the default path (".env" next to the
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# .nimble, which is the cwd because DevControlBot.sh chdirs there).
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#
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# PRECEDENCE — CRITICAL. The .env file must NEVER override a variable that is
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# already present in the environment: the official BotLauncher's values (and the
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# caller's explicit `FOO=bar ./DevControlBot.sh`) must always win, otherwise this
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# convenience file could silently break a BotLauncher run. Sourcing the file
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# directly would do the opposite, because an assignment in a sourced file
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# overwrites an already-exported variable of the same name. So the file is
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# FILTERED line by line: a `NAME=value` line is dropped when NAME is already set
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# in the environment (tested with `[ -n "${NAME+x}" ]`, i.e. set-but-maybe-empty,
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# not non-empty), and only the remaining, still-unset names are sourced with
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# `set -a`. The filtering is what implements the precedence, not the source order.
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ENV_FILE="${DEVCONTROLBOT_ENV_FILE:-.env}"
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if [ -f "$ENV_FILE" ]; then
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ENV_RAW="$BUILD_DIR/env.raw"
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ENV_KEEP="$BUILD_DIR/env.keep"
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ENV_ADDED=""
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# CRLF tolerance: drop the CRs, keep everything else verbatim.
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tr -d '\r' < "$ENV_FILE" > "$ENV_RAW"
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: > "$ENV_KEEP"
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while IFS= read -r line || [ -n "$line" ]; do
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case "$line" in
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''|\#*) continue ;; # blank / comment
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export\ *|export=*) line="${line#export }" ;;
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esac
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name="${line%%=*}"
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# Only plain NAME=value assignments; anything else is ignored, so the file
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# can never smuggle in commands. `name` is validated as an identifier
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# BEFORE being used in the eval below.
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printf '%s' "$name" | grep -q '^[A-Za-z_][A-Za-z_0-9]*$' || continue
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# PRECEDENCE: skip if the variable already exists in the environment.
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if eval "[ -n \"\${$name+x}\" ]"; then
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continue
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fi
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printf '%s\n' "$line" >> "$ENV_KEEP"
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ENV_ADDED="$ENV_ADDED $name"
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done < "$ENV_RAW"
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if [ -n "$ENV_ADDED" ]; then
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set -a
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. "$ENV_KEEP"
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set +a
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fi
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rm -f "$ENV_RAW" "$ENV_KEEP"
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# Variable NAMES only, never values.
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echo "[devcontrolbot] env file loaded: $ENV_FILE (names added:${ENV_ADDED:- none}; values never printed)"
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echo "[devcontrolbot] variables already in the environment win and were left untouched"
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else
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echo "[devcontrolbot] no env file at $ENV_FILE (optional, using API defaults)"
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fi
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cleanup() {
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rc=$?
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trap - EXIT INT TERM
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rm -rf "$BUILD_DIR"
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if [ -d "$BUILD_DIR" ]; then
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echo "[devcontrolbot] cleanup failed: $BUILD_DIR still present" >&2
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exit 1
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fi
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exit $rc
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}
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trap cleanup EXIT
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trap 'exit 130' INT
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trap 'exit 143' TERM
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# Release: hints and the progress/dot lines are noise, so the compiler output is
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# captured to a log and only shown if the build fails (errors are ALWAYS shown).
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# Debug: classic build, full compiler output (config-file hints, diagnostics).
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LOG="$BUILD_DIR/build.log"
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if [ "$BUILD_MODE" = "debug" ]; then
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echo "[devcontrolbot] compiling DevControlBot.nim (DEBUG BUILD) -> $BINARY"
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# `eval` re-parses $DEPS so the embedded quotes do the word splitting: the
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# dependency paths survive spaces, without relying on glob or brace expansion.
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# No pipe: POSIX sh has no PIPESTATUS, and `nim | tee` would report tee's
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# status, not the compiler's. Buffer first, then replay the log verbatim.
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eval nim c $DEPS --out:"$BINARY" DevControlBot.nim >"$LOG" 2>&1
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compile_rc=$?
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cat "$LOG"
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else
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echo "[devcontrolbot] compiling DevControlBot.nim -> $BINARY"
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eval nim c -d:release --hints:off $DEPS --out:"$BINARY" DevControlBot.nim >"$LOG" 2>&1
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compile_rc=$?
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fi
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if [ $compile_rc -ne 0 ]; then
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if [ "$BUILD_MODE" != "debug" ]; then
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echo "[devcontrolbot] --- compiler output ---" >&2
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cat "$LOG" >&2
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echo "[devcontrolbot] --- end compiler output ---" >&2
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fi
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echo "[devcontrolbot] COMPILE FAILED (nim c exited $compile_rc) — errors above." >&2
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die $EXIT_COMPILE
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fi
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rm -f "$LOG"
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if [ "$BUILD_MODE" = "debug" ]; then
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echo "[devcontrolbot] build ok (debug)"
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else
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echo "[devcontrolbot] build ok (release)"
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fi
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# The bot reads argv[1] as its metadata JSON path. If the caller already
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# supplied a JSON, use that instead of the bundled one.
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if [ -n "${1:-}" ] && [ "${1##*.}" = "json" ]; then
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echo "[devcontrolbot] using caller-supplied metadata: $1"
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"$BINARY" "$@"
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else
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# NOTE: no `exec` here: the shell must survive so the EXIT trap can clean up.
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echo "[devcontrolbot] running $BINARY DevControlBot.json $*"
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"$BINARY" DevControlBot.json "$@"
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fi
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bot_rc=$?
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if [ $bot_rc -ne 0 ]; then
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echo "[devcontrolbot] bot exited with code $bot_rc." >&2
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if [ $bot_rc -eq $EXIT_NO_SERVER ]; then
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# The Tank Royale client answers a refused connection with this exact
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# exit code, so it means "no server", not "broken bot".
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echo "[devcontrolbot] No game server on ${SERVER_URL:-ws://localhost:7654} (SERVER_URL)." >&2
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echo "[devcontrolbot] Start the Tank Royale server, or check it is listening on port 7654." >&2
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else
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echo "[devcontrolbot] The bot ran but failed at runtime (crash or bad metadata)." >&2
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fi
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fi
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die $bot_rc
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"""
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task runBot, "Compile, run and clean up the bot":
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# Nimble passes every CLI argument here (its own flags, then the task name,
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# then the caller's arguments). Ours are the ones after the task name.
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var args = ""
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var seen = false
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for a in commandLineParams():
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if seen:
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if args != "": args = args & " "
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args = args & quoteShell(a)
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elif a == "runBot":
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seen = true
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exec "sh -c " & quoteShell(runScript) & " devcontrolbot " & args
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