docker-entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

# Copy seed auth files to writable locations so the CLI can refresh expired
# OAuth tokens. Seeds are mounted :ro to avoid race conditions between
# concurrent Claude CLI subprocesses writing to the same host file.
SEED="$HOME/.claude.json.seed"
AUTH="$HOME/.claude.json"
if [[ -f "$SEED" ]]; then
  cp "$SEED" "$AUTH"
fi

CREDS_SEED="$HOME/.claude/.credentials.json.seed"
CREDS="$HOME/.claude/.credentials.json"
if [[ -f "$CREDS_SEED" ]]; then
  cp "$CREDS_SEED" "$CREDS"
fi

if [[ ! -f "$CREDS" ]]; then
  echo "Error: Claude CLI credentials not found." >&2
  echo "" >&2
  echo "Run on your host machine:" >&2
  echo "  ./scripts/export-auth.sh" >&2
  echo "" >&2
  echo "Then retry: docker compose run --rm understudy" >&2
  exit 1
fi

if ! ls /app/prompts/*-system.md >/dev/null 2>&1; then
  echo "Warning: no character prompts found in /app/prompts/" >&2
  echo "Add a <name>-system.md file to the prompts/ directory." >&2
fi

exec "$@"