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iso-image: slim down UEFI El Torito image

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UEFI firmware does not have to be able to read ISO9660 filesystems, so
the El Torito mechanism provides a way to specify an embedded FAT32
image which contains files the UEFI firmware itself must be able to
read, such as UEFI executables. Once GRUB starts and reads its
configuration, it can access the ISO9660 filesystem to load other files.

This change removes the unused kernel, initrd, and GRUB font files from
the El Torito image, but keeps the GRUB configuration and UEFI
executables. These files have been present since EFI support was
originally introduced in commit 097c656. Other distribution ISOs, such
as Ubuntu 20.04, Fedora 35, and Windows 10 work this way too. This saves
24MiB on x86_64 and 61MiB on aarch64 ISOs.
This commit is contained in:
Thomas Watson 2022-03-26 14:45:12 -05:00 committed by Your Name
parent f7ad253271
commit 0931014baf
1 changed files with 7 additions and 9 deletions
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16
nixos/modules/installer/cd-dvd/iso-image.nix
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@ -369,10 +369,10 @@ let
${lib.optionalString (refindBinary != null) ''
# GRUB apparently cannot do "chainloader" operations on "CD".
if [ "\$root" != "cd0" ]; then
# Force root to be the FAT partition
# Otherwise it breaks rEFInd's boot
search --set=root --no-floppy --fs-uuid 1234-5678
menuentry 'rEFInd' --class refind {
# Force root to be the FAT partition
# Otherwise it breaks rEFInd's boot
search --set=root --no-floppy --fs-uuid 1234-5678
chainloader (\$root)/EFI/boot/${refindBinary}
}
fi
@ -400,10 +400,8 @@ let
# dates (cp -p, touch, mcopy -m, faketime for label), IDs (mkfs.vfat -i)
''
mkdir ./contents && cd ./contents
cp -rp "${efiDir}"/EFI .
mkdir ./boot
cp -p "${config.boot.kernelPackages.kernel}/${config.system.boot.loader.kernelFile}" \
"${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}" ./boot/
mkdir -p ./EFI/boot
cp -rp "${efiDir}"/EFI/boot/{grub.cfg,*.efi} ./EFI/boot
# Rewrite dates for everything in the FS
find . -exec touch --date=2000-01-01 {} +
@ -421,11 +419,11 @@ let
faketime "2000-01-01 00:00:00" mkfs.vfat -i 12345678 -n EFIBOOT "$out"
# Force a fixed order in mcopy for better determinism, and avoid file globbing
for d in $(find EFI boot -type d | sort); do
for d in $(find EFI -type d | sort); do
faketime "2000-01-01 00:00:00" mmd -i "$out" "::/$d"
done
for f in $(find EFI boot -type f | sort); do
for f in $(find EFI -type f | sort); do
mcopy -pvm -i "$out" "$f" "::/$f"
done