Shawl

Shawl is a wrapper for running arbitrary programs as Windows services, written in Rust. It handles the Windows service API for you so that your program only needs to respond to ctrl-C/SIGINT. If you're creating a project that needs to run as a service, simply bundle Shawl with your project, set it as the entry point, and pass the command to run via CLI. Here is an example of creating a service wrapped with Shawl (note that -- separates Shawl's own options from the command that you'd like it to run):

• Using Shawl's add command:
  • shawl add --name my-app -- C:/path/my-app.exe
• Using the Windows sc command for more control:
  • sc create my-app binPath= "C:/path/shawl.exe run -- C:/path/my-app.exe"
• Then start or configure the service as normal:
  • sc config my-app start= auto sc start my-app

Shawl will inspect the state of your program in order to report the correct status to Windows:

• By default, when your program exits, Shawl will restart it if the exit code is nonzero. You can customize this behavior with --(no-)restart for all exit codes and --restart-if(-not) for specific exit codes.
• When the service is requested to stop, Shawl sends your program a ctrl-C event, then waits up to 3000 milliseconds (based on --stop-timeout) before forcibly killing the process if necessary.
• In either case, if Shawl is not restarting your program, then it reports the exit code to Windows as a service-specific error, unless the exit code is 0 or a code you've configured with --pass.

Shawl differs from existing solutions like WinSW and NSSM in that they require running a special install command to prepare the service, which means, for example, that you have to run a CustomAction if you need to install a service in an MSI. With Shawl, you can configure the service however you want, such as with the normal ServiceInstall in an MSI or by running sc create, because Shawl doesn't have any special setup of its own. The shawl add command is just an optional convenience.

Installation

• Prebuilt binaries are available on the releases page. It's portable, so you can simply download it and put it anywhere without going through an installer.
• If you have Rust installed, you can run cargo install shawl.

CLI

```console $ shawl --help Wrap arbitrary commands as Windows services

USAGE: shawl.exe shawl.exe

FLAGS: -h, --help Prints help information -V, --version Prints version information

SUBCOMMANDS: add Add a new service help Prints this message or the help of the given subcommand(s) run Run a command as a service; only works when launched by the Windows service manager ```

Development

Rust 1.38.0 or newer is recommended. Commands assume you are using Git Bash on Windows:

• Run tests (avoid concurrency since the integration tests make real services):
  • cargo test -- --test-threads 1
• Add targets:
  • 32-bit: rustup target add i686-pc-windows-msvc
  • 64-bit: rustup target add x86_64-pc-windows-msvc
• Install tool for generating license bundle:
  • cargo install cargo-lichking
• Prepare release: export VERSION=$(cargo pkgid | cut -d# -f2 | cut -d: -f2) rm -rf dist mkdir dist cargo build --release --target i686-pc-windows-msvc cargo build --release --target x86_64-pc-windows-msvc cp target/i686-pc-windows-msvc/release/shawl.exe dist/shawl-v$VERSION-win32.exe cp target/x86_64-pc-windows-msvc/release/shawl.exe dist/shawl-v$VERSION-win64.exe cargo lichking bundle --file dist/shawl-v$VERSION-legal.txt sed -i -E 's/\\\\\?\\C:\\Users\\[^\\]+/~/g' dist/shawl-v$VERSION-legal.txt