Add macOS cross-compilation support for GuruRMM agent

Enables building macOS agents (Intel and Apple Silicon) on Linux server
without requiring Mac hardware. Successfully tested on M3 MacBook Air.

Changes:
- Configure rustls for macOS builds (easier cross-compilation)
- Keep native-tls for Windows/Linux (Windows 7 compatibility)
- Add osxcross linker configuration for both architectures
- Create build-macos.sh script for automated builds
- Document complete setup in MACOS_BUILD.md

Technical Details:
- Build server: 172.16.3.30 (Ubuntu 22.04)
- Toolchain: osxcross 1.5 with macOS SDK 14.5
- Targets: x86_64-apple-darwin, aarch64-apple-darwin
- Binary sizes: ~3.5M (Intel), ~3.1M (ARM64)
- Build time: ~90 seconds per target

Tested: Successfully connected to wss://rmm-api.azcomputerguru.com/ws
Agent ID: 6177bcac-e046-4166-ac76-a6db68a363ab

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
2026-04-02 20:03:35 -07:00
parent 459f6b36d5
commit 53cadd0f97
4 changed files with 349 additions and 5 deletions

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@@ -1,2 +1,11 @@
[target.x86_64-pc-windows-msvc]
rustflags = ["-C", "target-feature=+crt-static", "-C", "link-args=/SUBSYSTEM:CONSOLE,6.01"]
# macOS cross-compilation with osxcross
[target.x86_64-apple-darwin]
linker = "/opt/osxcross/target/bin/x86_64-apple-darwin23.5-clang"
ar = "/opt/osxcross/target/bin/x86_64-apple-darwin23.5-ar"
[target.aarch64-apple-darwin]
linker = "/opt/osxcross/target/bin/aarch64-apple-darwin23.5-clang"
ar = "/opt/osxcross/target/bin/aarch64-apple-darwin23.5-ar"

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@@ -19,13 +19,9 @@ tokio = { version = "1", features = ["full"] }
# System information (cross-platform metrics)
sysinfo = "0.31"
# WebSocket client (native-tls for Windows 7/2008R2 compatibility)
tokio-tungstenite = { version = "0.24", features = ["native-tls"] }
# WebSocket - futures utilities
futures-util = "0.3"
# HTTP client (fallback/registration) - native-tls for Windows 7/2008R2 compatibility
reqwest = { version = "0.12", default-features = false, features = ["json", "native-tls"] }
# Serialization
serde = { version = "1", features = ["derive"] }
serde_json = "1"
@@ -66,6 +62,19 @@ local-ip-address = "0.6"
# Async file operations
tokio-util = "0.7"
# Platform-specific TLS dependencies
[target.'cfg(not(target_os = "macos"))'.dependencies]
# WebSocket client - native-tls for Windows/Linux (Windows 7 compatibility)
tokio-tungstenite = { version = "0.24", features = ["native-tls"] }
# HTTP client - native-tls for Windows 7/2008R2 compatibility
reqwest = { version = "0.12", default-features = false, features = ["json", "native-tls"] }
[target.'cfg(target_os = "macos")'.dependencies]
# WebSocket client - rustls for macOS (easier cross-compilation)
tokio-tungstenite = { version = "0.24", features = ["rustls-tls-native-roots"] }
# HTTP client - rustls for macOS
reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls-native-roots", "blocking"] }
[target.'cfg(windows)'.dependencies]
# Windows service support (optional, only for native-service feature)
windows-service = { version = "0.7", optional = true }

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@@ -0,0 +1,256 @@
# macOS Cross-Compilation Setup
## Overview
GuruRMM agent can now be built for macOS (Intel and Apple Silicon) directly on the Linux build server (172.16.3.30) without requiring a Mac for compilation.
## Architecture
- **Build Server**: Ubuntu 22.04 LTS (172.16.3.30)
- **Toolchain**: osxcross with macOS SDK 14.5
- **Targets**:
- `x86_64-apple-darwin` (Intel Macs)
- `aarch64-apple-darwin` (Apple Silicon Macs)
- **TLS Stack**: rustls (pure Rust, no native dependencies)
## Key Changes
### 1. Cargo.toml Modifications
The agent now uses **conditional dependencies** for TLS:
- **Windows/Linux**: `native-tls` (for Windows 7 compatibility)
- **macOS**: `rustls-tls-native-roots` (for easier cross-compilation)
```toml
[target.'cfg(not(target_os = "macos"))'.dependencies]
tokio-tungstenite = { version = "0.24", features = ["native-tls"] }
reqwest = { version = "0.12", default-features = false, features = ["json", "native-tls"] }
[target.'cfg(target_os = "macos")'.dependencies]
tokio-tungstenite = { version = "0.24", features = ["rustls-tls-native-roots"] }
reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls-native-roots", "blocking"] }
```
### 2. Cargo Configuration (.cargo/config.toml)
Linker configuration for macOS targets:
```toml
[target.x86_64-apple-darwin]
linker = "/opt/osxcross/target/bin/x86_64-apple-darwin23.5-clang"
ar = "/opt/osxcross/target/bin/x86_64-apple-darwin23.5-ar"
[target.aarch64-apple-darwin]
linker = "/opt/osxcross/target/bin/aarch64-apple-darwin23.5-clang"
ar = "/opt/osxcross/target/bin/aarch64-apple-darwin23.5-ar"
```
## Build Server Setup
### Installed Components
1. **osxcross**: `/opt/osxcross/`
- macOS SDK 14.5 (darwin23.5)
- Clang/LLVM cross-compilers
- Binutils for macOS
2. **Rust Toolchain**:
- rustc 1.94.1
- Targets: `x86_64-apple-darwin`, `aarch64-apple-darwin`
3. **Build Dependencies**:
- clang-14
- cmake 3.22.1
- libxml2-dev
- uuid-dev
### Environment Variables
For cross-compilation, the following must be set:
```bash
export PATH="/opt/osxcross/target/bin:$PATH"
export CC_x86_64_apple_darwin=x86_64-apple-darwin23.5-clang
export AR_x86_64_apple_darwin=x86_64-apple-darwin23.5-ar
export CC_aarch64_apple_darwin=aarch64-apple-darwin23.5-clang
export AR_aarch64_apple_darwin=aarch64-apple-darwin23.5-ar
```
## Building for macOS
### Using the Build Script
The simplest method is to use the provided build script:
```bash
cd ~/gururmm/agent
./build-macos.sh
```
This will:
- Build for both Intel (x86_64) and Apple Silicon (arm64)
- Create binaries in `dist/` directory
- Generate SHA256 checksums
- Name binaries: `gururmm-agent-macos-{amd64|arm64}-v{version}`
### Manual Build
For individual targets:
```bash
# Source environment
source ~/.cargo/env
export PATH="/opt/osxcross/target/bin:$PATH"
# Intel Macs
export CC_x86_64_apple_darwin=x86_64-apple-darwin23.5-clang
export AR_x86_64_apple_darwin=x86_64-apple-darwin23.5-ar
cargo build --release --target x86_64-apple-darwin
# Apple Silicon Macs
export CC_aarch64_apple_darwin=aarch64-apple-darwin23.5-clang
export AR_aarch64_apple_darwin=aarch64-apple-darwin23.5-ar
cargo build --release --target aarch64-apple-darwin
```
## Build Output
### Binary Sizes
- **Intel (x86_64)**: ~3.5 MB
- **Apple Silicon (arm64)**: ~3.1 MB
### Build Times (on 172.16.3.30)
- **Clean build**: ~1 minute 30 seconds per target
- **Incremental build**: ~20-30 seconds per target
### Output Directory Structure
```
dist/
├── gururmm-agent-macos-amd64-v0.6.0
├── gururmm-agent-macos-amd64-v0.6.0.sha256
├── gururmm-agent-macos-arm64-v0.6.0
└── gururmm-agent-macos-arm64-v0.6.0.sha256
```
## Deployment
### Installation on macOS
Intel Macs:
```bash
curl -fsSL http://172.16.3.30/downloads/gururmm-agent-macos-amd64 -o /tmp/gururmm-agent
chmod +x /tmp/gururmm-agent
sudo /tmp/gururmm-agent install --server-url wss://rmm-api.azcomputerguru.com/ws --api-key SITE-CODE
```
Apple Silicon Macs:
```bash
curl -fsSL http://172.16.3.30/downloads/gururmm-agent-macos-arm64 -o /tmp/gururmm-agent
chmod +x /tmp/gururmm-agent
sudo /tmp/gururmm-agent install --server-url wss://rmm-api.azcomputerguru.com/ws --api-key SITE-CODE
```
### macOS Service Configuration
The agent installs as a launchd service:
- **Plist**: `/Library/LaunchDaemons/com.gururmm.agent.plist`
- **Binary**: `/usr/local/bin/gururmm-agent`
- **Config**: `/etc/gururmm/agent.toml`
## Troubleshooting
### Build Failures
1. **"ring" crate compilation errors**:
- Ensure `CC_*` and `AR_*` environment variables are set
- Verify osxcross binaries are in PATH
2. **Linker errors**:
- Check `.cargo/config.toml` has correct linker paths
- Verify osxcross installation at `/opt/osxcross/target/bin/`
3. **"native-tls" errors on macOS**:
- Ensure Cargo.toml uses `rustls-tls-native-roots` for macOS targets
- Conditional dependencies must be properly configured
### Testing Binaries
To verify a macOS binary was built correctly:
```bash
# On build server
file target/x86_64-apple-darwin/release/gururmm-agent
# Output: Mach-O 64-bit executable x86_64
file target/aarch64-apple-darwin/release/gururmm-agent
# Output: Mach-O 64-bit executable arm64
```
On an actual Mac, the binary should run without errors:
```bash
./gururmm-agent --version
# Output: gururmm-agent 0.6.0
```
## Maintenance
### Updating osxcross
To update to a newer macOS SDK:
1. Download SDK from https://github.com/joseluisq/macosx-sdks/releases
2. Place in `/opt/osxcross/tarballs/`
3. Run `/opt/osxcross/build.sh`
4. Update linker paths in `.cargo/config.toml` if SDK version changes
### Updating Rust Targets
```bash
rustup target add x86_64-apple-darwin
rustup target add aarch64-apple-darwin
```
## Security Notes
- macOS SDK usage is in a legal gray area; osxcross requires accepting Xcode license terms
- Binaries built with osxcross are functionally identical to native macOS builds
- TLS implementation (rustls) is audited and widely used in production Rust applications
- No code signing is performed; users will need to approve binary on first run
## CI/CD Integration
The build script can be integrated into automated builds:
```bash
# Example: Build on git push
cd ~/gururmm/agent
git pull
./build-macos.sh
# Copy to deployment directory
cp dist/gururmm-agent-macos-* /var/www/gururmm/downloads/
```
## Performance
Cross-compiled binaries perform identically to native builds:
- No runtime overhead from cross-compilation
- Full optimization with `opt-level = "z"` and LTO
- Binary stripping reduces size without affecting performance
## Future Enhancements
- [ ] Code signing for macOS binaries (requires Apple Developer account)
- [ ] Notarization for Gatekeeper compatibility
- [ ] Universal binary (combined Intel + ARM)
- [ ] Automated CI/CD pipeline with GitHub Actions (macOS runners)
---
**Last Updated**: 2026-04-03
**Build Server**: 172.16.3.30 (Ubuntu 22.04)
**osxcross Version**: 1.5
**SDK Version**: macOS 14.5 (darwin23.5)

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@@ -0,0 +1,70 @@
#!/bin/bash
set -e
# Build script for GuruRMM agent - macOS only
# Supports: macOS (Intel & Apple Silicon)
echo "=== GuruRMM Agent macOS Build ==="
echo ""
# Add osxcross to PATH
export PATH="/opt/osxcross/target/bin:$PATH"
# Source cargo environment
source ~/.cargo/env
# Set up cross-compilation environment variables for macOS
export CC_x86_64_apple_darwin=x86_64-apple-darwin23.5-clang
export AR_x86_64_apple_darwin=x86_64-apple-darwin23.5-ar
export CC_aarch64_apple_darwin=aarch64-apple-darwin23.5-clang
export AR_aarch64_apple_darwin=aarch64-apple-darwin23.5-ar
# Output directory
OUTPUT_DIR="$(dirname "$0")/dist"
# Create output directory
mkdir -p "$OUTPUT_DIR"
# Get version from Cargo.toml
VERSION=$(grep '^version' Cargo.toml | head -1 | cut -d'"' -f2)
echo "Building GuruRMM Agent v$VERSION for macOS"
echo ""
# Function to build for a target
build_target() {
local target=$1
local name=$2
local ext=$3
echo "[INFO] Building for $name ($target)..."
cargo build --release --target $target
local binary_name="gururmm-agent$ext"
local output_name="gururmm-agent-$name-v$VERSION$ext"
cp "target/$target/release/$binary_name" "$OUTPUT_DIR/$output_name"
# Create SHA256 checksum
cd "$OUTPUT_DIR"
sha256sum "$output_name" > "$output_name.sha256"
cd - > /dev/null
# Get file size
local size=$(du -h "$OUTPUT_DIR/$output_name" | cut -f1)
echo "[SUCCESS] Built $output_name ($size)"
echo ""
}
# Build for macOS platforms
echo "=== Building for macOS (Intel) ==="
build_target "x86_64-apple-darwin" "macos-amd64" ""
echo "=== Building for macOS (Apple Silicon) ==="
build_target "aarch64-apple-darwin" "macos-arm64" ""
echo ""
echo "=== Build Complete ==="
echo ""
echo "Artifacts in: $OUTPUT_DIR"
ls -lh "$OUTPUT_DIR"