docker-entrypoint.sh

#!/bin/bash
set -e

# ============================================================================
# User mapping for host filesystem permissions
# ============================================================================
# If LOCAL_UID/LOCAL_GID are set, create a user with matching IDs and re-exec
# this script as that user. This ensures ALL operations (not just the final
# command) run as the correct user, avoiding permission issues with /tmp files.

if [ "$(id -u)" = "0" ] && [ "${LOCAL_UID:-0}" != "0" ]; then
    uid="${LOCAL_UID}"
    gid="${LOCAL_GID:-$uid}"

    # Create group if it doesn't exist
    if ! getent group "$gid" > /dev/null 2>&1; then
        groupadd -g "$gid" devgroup
    fi

    # Create user if it doesn't exist
    if ! getent passwd "$uid" > /dev/null 2>&1; then
        useradd -u "$uid" -g "$gid" -m -s /bin/bash devuser
    fi

    # Get the username for this UID
    DEV_USER=$(getent passwd "$uid" | cut -d: -f1)

    # Ensure the user owns necessary directories (mounted volumes + Flutter tool caches)
    for dir in /app/.mix /app/.hex /app/player/.pub-cache /app/player/.dart_tool /app/player/build /app/_build /app/deps /opt/flutter/packages/flutter_tools/.dart_tool; do
        if [ -d "$dir" ]; then
            chown -R "$uid:$gid" "$dir" 2>/dev/null || true
        fi
    done
    # Create Flutter directories if they don't exist (for fresh volume mounts)
    mkdir -p /opt/flutter/packages/flutter_tools/.dart_tool
    mkdir -p /app/player/.dart_tool /app/player/build
    chown -R "$uid:$gid" /opt/flutter/packages/flutter_tools/.dart_tool 2>/dev/null || true
    chown -R "$uid:$gid" /app/player/.dart_tool /app/player/build 2>/dev/null || true

    # Create user's cache directory
    USER_HOME=$(getent passwd "$uid" | cut -d: -f5)
    mkdir -p "$USER_HOME/.cache"
    chown -R "$uid:$gid" "$USER_HOME/.cache"

    # Re-exec this script as the dev user
    # Pass LOCAL_UID=0 to prevent infinite recursion
    exec gosu "$DEV_USER" env LOCAL_UID=0 LOCAL_GID=0 "$0" "$@"
fi

# ============================================================================
# Main entrypoint logic (runs as dev user or root if no LOCAL_UID)
# ============================================================================

# Determine if we're running an interactive server or a one-off command
if [ $# -eq 0 ]; then
    COMMAND="mix phx.server"
    FULL_SETUP=true
else
    COMMAND="$*"
    FULL_SETUP=false
fi

# Quick commands that don't need any setup
case "$1" in
    sh|bash)
        exec "$@"
        ;;
esac

# Minimal setup for all mix commands
# Only clean exqlite if the NIF was compiled for a different platform (e.g., host vs container)
# This avoids unnecessary recompilation on every container start
NIF_FILE="_build/dev/lib/exqlite/priv/sqlite3_nif.so"
if [ -f "$NIF_FILE" ]; then
    # Check if the NIF is compatible with this container by checking its ELF interpreter
    # Host-compiled NIFs (e.g., NixOS) will have a different interpreter than container NIFs
    if ! ldd "$NIF_FILE" > /dev/null 2>&1; then
        echo "==> Removing incompatible exqlite NIF (compiled for different platform)..."
        rm -rf _build/dev/lib/exqlite
    fi
fi

# Install Hex and Rebar if not already installed (quiet)
if [ ! -d "$MIX_HOME" ] || [ ! -f "$MIX_HOME/rebar" ]; then
    mix local.hex --force --if-missing > /dev/null 2>&1
    mix local.rebar --force > /dev/null 2>&1
fi

# Full setup only for server mode (no args passed)
if [ "$FULL_SETUP" = true ]; then
    echo "==> Starting Mydia development environment..."

    # Install Mix dependencies
    echo "==> Installing dependencies..."
    mix deps.get --only dev

    # Compile exqlite if needed
    if [ -d "deps/exqlite" ] && [ ! -f "_build/dev/lib/exqlite/priv/sqlite3_nif.so" ]; then
        echo "==> Compiling exqlite..."
        mix deps.compile exqlite
    fi

    # Setup database
    echo "==> Setting up database..."
    mix ecto.create --quiet 2>/dev/null || true
    mix mydia.backup_before_migrate
    mix ecto.migrate

    # Install and build assets if needed
    if [ ! -d "assets/node_modules" ] || [ -z "$(ls -A assets/node_modules 2>/dev/null)" ]; then
        echo "==> Installing Node.js dependencies..."
        mix assets.setup
    fi

    if [ ! -d "priv/static/assets" ] || [ -z "$(ls -A priv/static/assets 2>/dev/null)" ]; then
        echo "==> Building assets..."
        mix assets.build
    fi

    # Setup Flutter player
    echo "==> Setting up Flutter player..."
    cd player

    # Install Flutter dependencies
    flutter pub get

    # Run initial code generation if needed
    if [ -f "lib/graphql/schema.graphql.dart" ]; then
        echo "==> GraphQL codegen already exists, skipping initial build..."
    else
        echo "==> Running initial code generation (GraphQL, Riverpod)..."
        flutter pub run build_runner build --delete-conflicting-outputs || true
    fi

    # Start build_runner watch in background
    echo "==> Starting build_runner watch in background..."
    flutter pub run build_runner watch --delete-conflicting-outputs > /tmp/build_runner.log 2>&1 &

    cd ..

    echo "==> Starting Phoenix server..."
fi

exec $COMMAND