2025-10-19 21:53:52 -07:00
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# Sprout Development Guide
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This guide is a work in progress.
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## Development Setup
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You can use any Rust development environment to develop Sprout.
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Rustup is recommended as the Rust toolchain manager to manage Rust versions and targets.
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We currently only support `x86_64-unknown-uefi` and `aarch64-unknown-uefi` targets.
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To test your changes in QEMU, please run `./hack/dev/boot.sh`, you can specify `x86_64` or `aarch64`
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as an argument to boot.sh to boot the specified architecture.
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2025-11-03 20:47:21 -05:00
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## Crate Structure
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Sprout is split into multiple crates:
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2026-09-26 20:26:57 -07:00
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- `edera-sprout-boot` at `crates/boot`: Bootloader entrypoint for Sprout.
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- `edera-sprout-bls` at `crates/bls`: Parsing and sorting of Boot Loader Specification entries.
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2025-11-03 22:37:06 -05:00
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- `edera-sprout-build` at `crates/build`: Build logic for Sprout.
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2025-11-03 20:47:21 -05:00
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- `edera-sprout-config` at `crates/config`: Serialization structures for the Sprout configuration file.
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- `edera-sprout-eficore` at `crates/eficore`: Core library for Sprout EFI code.
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2026-09-26 20:26:57 -07:00
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- `edera-sprout-parsing` at `crates/parsing`: Value stamping and other parsing helpers for Sprout.
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2025-11-03 20:47:21 -05:00
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It is intended that overtime Sprout will be split into even more crates.
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2025-10-19 21:53:52 -07:00
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## Hack Scripts
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You can use the `./hack` scripts to run common development tasks:
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### ./hack/build.sh
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Builds the Sprout binary for the target that would support your current machine.
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### ./hack/assemble.sh
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Builds both x86_64 and aarch64 binaries into `target/assemble`.
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### ./hack/clean.sh
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Cleans the target directory and any docker images that were built.
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### ./hack/format.sh
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Formats the code using `rustfmt` and shell scripts with `shfmt`.
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### ./hack/autofix.sh
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Applies Clippy and `rustfmt` fixes to the code, and formats shell scripts with `shfmt`.
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## Dev Scripts
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### ./hack/dev/build.sh
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Build Sprout as OCI images using Docker, including a kernel, initramfs, xen, and other supporting files.
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### ./hack/dev/boot.sh
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Boot Sprout's dev environment using QEMU for testing. This will let you test your changes in a real environment booting
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Alpine Linux with an initramfs.
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2026-10-04 10:21:13 -07:00
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### ./hack/dev/run
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Scripts to drive the dev environment without a terminal or a window, which suits automation and
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coding agents. QEMU runs in the background with a QMP socket, and its consoles are written to
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`target/run/<arch>/`. Only one run per architecture at a time, and the scripts need `python3` or `socat`.
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- `start.sh [arch]`: Builds and starts QEMU headless. `SPROUT_CONFIG_NAME` defaults to `graphical`.
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- `screenshot.sh [out.png]`: Saves a PNG of the display (QEMU 7.1 or newer) and prints the path.
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- `key.sh <qcode>...`: Presses keys such as `down`, `up`, `ret` or `ctrl+alt+delete`.
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- `wait-serial.sh <regex> [seconds]`: Waits for text on the firmware or Linux console.
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- `qmp.sh <json>...`: Sends raw QMP commands.
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- `status.sh` and `stop.sh`: Show the state of QEMU, and stop it.
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- `smoke.sh [arch]`: Starts, drives the graphical menu, waits for the Linux shell and stops.
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`boot.sh` supports this with `QEMU_HEADLESS`, `QEMU_QMP`, `QEMU_SERIAL_FILE`, `QEMU_CONSOLE_FILE` and `QEMU_EXTRA_ARGS`.
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