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Expose data for custom boot image creation #535

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Merged
Freax13 merged 2 commits into from
Feb 24, 2026
+24 −12
Merged

Expose data for custom boot image creation #535

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06f5949
extract fat-partition creation into separate pub fn
Wasabi375 Jan 22, 2026
dc8b3cf
fix capitalization
Freax13 Feb 24, 2026
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36 changes: 24 additions & 12 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -111,13 +111,15 @@ impl DiskImageBuilder {
pub fn create_bios_image(&self, image_path: &Path) -> anyhow::Result<()> {
const BIOS_STAGE_3_NAME: &str = "boot-stage-3";
const BIOS_STAGE_4_NAME: &str = "boot-stage-4";

let fat_partition = NamedTempFile::new().context("failed to create temp file")?;

let stage_3 = FileDataSource::Bytes(BIOS_STAGE_3);
let stage_4 = FileDataSource::Bytes(BIOS_STAGE_4);
let mut internal_files = BTreeMap::new();
internal_files.insert(BIOS_STAGE_3_NAME, stage_3);
internal_files.insert(BIOS_STAGE_4_NAME, stage_4);
let fat_partition = self
.create_fat_filesystem_image(internal_files)
self.create_fat_filesystem_image(internal_files, fat_partition.path())
.context("failed to create FAT partition")?;
mbr::create_mbr_disk(
BIOS_BOOT_SECTOR,
Expand All @@ -136,13 +138,10 @@ impl DiskImageBuilder {
#[cfg(feature = "uefi")]
/// Create a GPT disk image for booting on UEFI systems.
pub fn create_uefi_image(&self, image_path: &Path) -> anyhow::Result<()> {
const UEFI_BOOT_FILENAME: &str = "efi/boot/bootx64.efi";

let mut internal_files = BTreeMap::new();
internal_files.insert(UEFI_BOOT_FILENAME, FileDataSource::Bytes(UEFI_BOOTLOADER));
let fat_partition = self
.create_fat_filesystem_image(internal_files)
let fat_partition = NamedTempFile::new().context("failed to create temp file")?;
self.create_uefi_fat_partition(fat_partition.path())
.context("failed to create FAT partition")?;

gpt::create_gpt_disk(fat_partition.path(), image_path)
.context("failed to create UEFI GPT disk image")?;
fat_partition
Expand All @@ -152,6 +151,19 @@ impl DiskImageBuilder {
Ok(())
}

#[cfg(feature = "uefi")]
/// Create a bootable FAT partition for a UEFI system.
pub fn create_uefi_fat_partition(&self, partition_path: &Path) -> anyhow::Result<()> {
const UEFI_BOOT_FILENAME: &str = "efi/boot/bootx64.efi";

let mut internal_files = BTreeMap::new();
internal_files.insert(UEFI_BOOT_FILENAME, FileDataSource::Bytes(UEFI_BOOTLOADER));
self.create_fat_filesystem_image(internal_files, partition_path)
.context("failed to create FAT partition")?;

Ok(())
}

#[cfg(feature = "uefi")]
/// Create a folder containing the needed files for UEFI TFTP/PXE booting.
pub fn create_uefi_tftp_folder(&self, tftp_path: &Path) -> anyhow::Result<()> {
Expand Down Expand Up @@ -198,7 +210,8 @@ impl DiskImageBuilder {
fn create_fat_filesystem_image(
&self,
internal_files: BTreeMap<&str, FileDataSource>,
) -> anyhow::Result<NamedTempFile> {
partition_path: &Path,
) -> anyhow::Result<()> {
let mut local_map: BTreeMap<&str, _> = BTreeMap::new();

for (name, source) in &self.files {
Expand All @@ -214,10 +227,9 @@ impl DiskImageBuilder {
}
}

let out_file = NamedTempFile::new().context("failed to create temp file")?;
fat::create_fat_filesystem(local_map, out_file.path())
fat::create_fat_filesystem(local_map, partition_path)
.context("failed to create FAT filesystem")?;

Ok(out_file)
Ok(())
}
}
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