rust-kernel / scripts / qemu.sh

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#!/usr/bin/env bash
# Stage 21: how `cargo run` and `cargo test` start QEMU (Cargo.toml's
# bootimage `run-command`). bootimage calls this with the boot image and
# Cargo.toml's run-args / test-args; we only change two things:
#
#  1. Those args say `target/disk.img` & co. If you build with
#     CARGO_TARGET_DIR=/somewhere, the images are in /somewhere instead,
#     so every "=target/" becomes "=$CARGO_TARGET_DIR/".
#  2. The boot_v2 test kernel (tests/boot_v2.rs) gets one more disk:
#     target/rootfs-gpt.img, the boot contract v2 image build.rs makes.
#
# `exec`: QEMU replaces this script, so its PID is the one bootimage
# started (and times out).
set -euo pipefail
T="${CARGO_TARGET_DIR:-target}"
args=()
boot_v2=0
for a in "$@"; do
    args+=("${a//=target\//=$T/}")
    case "$a" in *bootimage-boot_v2-*) boot_v2=1 ;; esac
done
if [ "$boot_v2" = 1 ]; then
    args+=(-drive "file=$T/rootfs-gpt.img,format=raw,if=virtio,snapshot=on")
fi
exec qemu-system-x86_64 "${args[@]}"