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build: release-x86-64 — the flashable hybrid ISO (Etcher/dd + optical), built in-repo

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Daniel Samson
2026-07-20 13:37:10 +01:00
parent bdd8a48476
commit 914af52b94
5 changed files with 373 additions and 1 deletions
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build.zig
+25
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@@ -684,6 +684,31 @@ pub fn build(b: *std.Build) void {
const check_fat_step = b.step("check-fat-image", "Verify the FAT32 USB image is valid and bootable");
check_fat_step.dependOn(&check_fat.step);
// --- release-x86-64: danos-x86-64.iso, the flashable release image ---
// Wrap the FAT32 boot volume in a hybrid ISO (the in-repo Python builder
// again, no xorriso/isohybrid): an ISO9660 whose El Torito EFI boot entry
// and MBR ESP partition entry both point at the embedded FAT image. One
// file then boots every way release media is consumed — flashed raw to a
// USB stick with Etcher or dd, or burned to optical media — while
// danos-usb.img stays the raw superfloppy QEMU and the test harness boot.
const mk_iso = b.addSystemCommand(&.{"python3"});
mk_iso.addFileArg(b.path("tools/make-iso-image.py"));
const iso_image = mk_iso.addOutputFileArg("danos-x86-64.iso");
mk_iso.addFileArg(fat_image);
const iso_install = b.addInstallFile(iso_image, "danos-x86-64.iso");
const release_step = b.step("release-x86-64", "Build the flashable x86-64 release ISO (zig-out/danos-x86-64.iso; flash with Etcher or dd)");
release_step.dependOn(&iso_install.step);
// `zig build check-iso-image` — the ISO builder's own --verify (mirroring
// check-fat-image): the MBR partition, the El Torito catalog, and the
// embedded FAT32 image must all agree.
const check_iso = b.addSystemCommand(&.{"python3"});
check_iso.addFileArg(b.path("tools/make-iso-image.py"));
check_iso.addArg("--verify");
check_iso.addFileArg(iso_image);
const check_iso_step = b.step("check-iso-image", "Verify the release ISO is a valid hybrid (MBR ESP partition + El Torito EFI entry)");
check_iso_step.dependOn(&check_iso.step);
// --- run-x86-64: boot the x86-64 kernel in QEMU via UEFI/OVMF ---
// Firmware lives in different places per OS/distro, so probe the known
// layouts (Architecture, Debian/Ubuntu, Fedora, macOS Homebrew) and use the first