Add macOS DMG packaging script and SHA256 checksum generator

create-dmg.sh builds a distributable .dmg with binary, start.sh,
web-static, explorer, config, and bundled libsecp256k1. Supports
both x86_64 and arm64 architectures with install_name_tool fixup.

Author: frstrtr

installer/checksums.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Generate SHA256 checksums for all release artifacts
+#
+# Usage: ./checksums.sh [directory]
+# Default: current directory
+#
+# Generates SHA256SUMS file compatible with `sha256sum -c`
+
+set -e
+
+DIR="${1:-.}"
+OUTPUT="$DIR/SHA256SUMS"
+
+echo "Generating SHA256 checksums for release artifacts in $DIR"
+echo ""
+
+cd "$DIR"
+rm -f SHA256SUMS
+
+# Find release artifacts
+FILES=$(find . -maxdepth 1 \( \
+    -name '*.dmg' -o \
+    -name '*.exe' -o \
+    -name '*.zip' -o \
+    -name '*.tar.gz' -o \
+    -name '*-setup*' -o \
+    -name 'c2pool-*' -type d \
+    \) | sort)
+
+if [ -z "$FILES" ]; then
+    echo "No release artifacts found. Looking for binaries..."
+    FILES=$(find . -maxdepth 2 -name 'c2pool' -o -name 'c2pool.exe' | sort)
+fi
+
+for f in $FILES; do
+    [ -f "$f" ] || continue
+    sha256sum "$f" >> SHA256SUMS 2>/dev/null || shasum -a 256 "$f" >> SHA256SUMS
+    echo "  $(tail -1 SHA256SUMS)"
+done
+
+echo ""
+echo "Written to: $DIR/SHA256SUMS"
+cat SHA256SUMS

installer/macos/create-dmg.sh

@@ -0,0 +1,132 @@
+#!/bin/bash
+# c2pool macOS DMG builder
+#
+# Usage:
+#   ./create-dmg.sh <binary> <arch>
+#
+# Examples:
+#   ./create-dmg.sh ~/c2pool-build/build/src/c2pool/c2pool x86_64
+#   ./create-dmg.sh ~/c2pool-build/build-arm64/src/c2pool/c2pool arm64
+#
+# The script expects web-static/, explorer/, config/, start.sh in the
+# repo root (same level as src/).  Output: c2pool-VERSION-macos-ARCH.dmg
+
+set -e
+
+BINARY="$1"
+ARCH="${2:-$(uname -m)}"
+VERSION="0.1.1-alpha"
+VOLNAME="c2pool-${VERSION}"
+DMG_NAME="c2pool-${VERSION}-macos-${ARCH}.dmg"
+
+if [ -z "$BINARY" ] || [ ! -f "$BINARY" ]; then
+    echo "Usage: $0 <path-to-c2pool-binary> [arch]"
+    echo "  arch: x86_64 or arm64 (default: native)"
+    exit 1
+fi
+
+# Verify binary architecture
+ACTUAL_ARCH=$(file "$BINARY" | grep -o 'x86_64\|arm64' | head -1)
+if [ "$ACTUAL_ARCH" != "$ARCH" ]; then
+    echo "ERROR: binary is $ACTUAL_ARCH but arch=$ARCH specified"
+    exit 1
+fi
+
+# Find repo root (script is in installer/macos/)
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+# Staging directory
+STAGE=$(mktemp -d)
+APP_DIR="$STAGE/$VOLNAME"
+mkdir -p "$APP_DIR/lib"
+
+echo "Building $DMG_NAME from $BINARY"
+echo "  Repo: $REPO_ROOT"
+echo "  Stage: $STAGE"
+
+# Copy binary
+cp "$BINARY" "$APP_DIR/c2pool"
+chmod +x "$APP_DIR/c2pool"
+
+# Copy bundled assets
+cp -R "$REPO_ROOT/web-static" "$APP_DIR/web-static"
+cp -R "$REPO_ROOT/config" "$APP_DIR/config"
+if [ -d "$REPO_ROOT/explorer" ]; then
+    cp -R "$REPO_ROOT/explorer" "$APP_DIR/explorer"
+fi
+
+# Copy start script
+if [ -f "$REPO_ROOT/start.sh" ]; then
+    cp "$REPO_ROOT/start.sh" "$APP_DIR/start.sh"
+    chmod +x "$APP_DIR/start.sh"
+else
+    # Generate a start script
+    cat > "$APP_DIR/start.sh" << 'STARTEOF'
+#!/bin/bash
+DIR="$(cd "$(dirname "$0")" && pwd)"
+CONFIG="${1:-$DIR/config/c2pool_mainnet.yaml}"
+export DYLD_LIBRARY_PATH="$DIR/lib:${DYLD_LIBRARY_PATH:-}"
+echo "=== c2pool ==="
+echo "Config: $CONFIG"
+exec "$DIR/c2pool" --integrated --net litecoin \
+    --embedded-ltc --embedded-doge \
+    --dashboard-dir "$DIR/web-static" \
+    --config "$CONFIG"
+STARTEOF
+    chmod +x "$APP_DIR/start.sh"
+fi
+
+# Copy secp256k1 dylib
+if [ "$ARCH" = "arm64" ]; then
+    SECP_LIB="/Users/user0/arm64-deps/lib/libsecp256k1.dylib"
+    SECP_REAL="/Users/user0/arm64-deps/lib/libsecp256k1.6.dylib"
+else
+    SECP_LIB="/usr/local/lib/libsecp256k1.dylib"
+    SECP_REAL="/usr/local/lib/libsecp256k1.6.dylib"
+fi
+if [ -f "$SECP_REAL" ]; then
+    cp "$SECP_REAL" "$APP_DIR/lib/libsecp256k1.6.dylib"
+    ln -sf libsecp256k1.6.dylib "$APP_DIR/lib/libsecp256k1.dylib"
+    # Fix dylib load path so binary finds the bundled lib
+    install_name_tool -change "$SECP_LIB" "@executable_path/lib/libsecp256k1.6.dylib" "$APP_DIR/c2pool" 2>/dev/null || true
+    install_name_tool -change "$SECP_REAL" "@executable_path/lib/libsecp256k1.6.dylib" "$APP_DIR/c2pool" 2>/dev/null || true
+elif [ -f "$SECP_LIB" ]; then
+    cp "$SECP_LIB" "$APP_DIR/lib/libsecp256k1.dylib"
+    install_name_tool -change "$SECP_LIB" "@executable_path/lib/libsecp256k1.dylib" "$APP_DIR/c2pool" 2>/dev/null || true
+fi
+
+# Add a README
+cat > "$APP_DIR/README.txt" << 'README'
+c2pool — P2Pool rebirth in C++
+https://github.com/frstrtr/c2pool
+
+Quick start:
+  1. Open Terminal
+  2. cd to this directory
+  3. ./start.sh
+
+Or run directly:
+  ./c2pool --integrated --net litecoin --embedded-ltc --embedded-doge
+
+Dashboard: http://localhost:8080
+Stratum:   stratum+tcp://localhost:9327
+
+Miners connect with their payout address as the stratum username.
+README
+
+# Create DMG
+OUTPUT="$REPO_ROOT/$DMG_NAME"
+rm -f "$OUTPUT"
+hdiutil create -volname "$VOLNAME" \
+    -srcfolder "$APP_DIR" \
+    -ov -format UDZO \
+    "$OUTPUT"
+
+# Cleanup
+rm -rf "$STAGE"
+
+echo ""
+echo "Created: $OUTPUT"
+echo "Size: $(du -h "$OUTPUT" | cut -f1)"
+echo "SHA256: $(shasum -a 256 "$OUTPUT" | cut -d' ' -f1)"