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sd-image: make firmware partition deterministic

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Based on how it works for the EFI partition of an iso-image at
nixos/modules/installer/cd-dvd/iso-image.nix.
This commit is contained in:
Martin Schwaighofer 2021-12-05 17:19:13 +01:00
parent eb569423a7
commit f6ee247a1f
1 changed files with 12 additions and 2 deletions
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14
nixos/modules/installer/sd-card/sd-image.nix
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@ -224,14 +224,24 @@ in
# Create a FAT32 /boot/firmware partition of suitable size into firmware_part.img
eval $(partx $img -o START,SECTORS --nr 1 --pairs)
truncate -s $((SECTORS * 512)) firmware_part.img
faketime "1970-01-01 00:00:00" mkfs.vfat -i ${config.sdImage.firmwarePartitionID} -n ${config.sdImage.firmwarePartitionName} firmware_part.img
faketime "2000-01-01 00:00:00" mkfs.vfat -i ${config.sdImage.firmwarePartitionID} -n ${config.sdImage.firmwarePartitionName} firmware_part.img
# Populate the files intended for /boot/firmware
mkdir firmware
${config.sdImage.populateFirmwareCommands}
find firmware -exec touch --date=2000-01-01 {} +
# Copy the populated /boot/firmware into the SD image
(cd firmware; mcopy -psvm -i ../firmware_part.img ./* ::)
(cd firmware;
# Force a fixed order in mcopy for better determinism, and avoid file globbing
for d in $(find . -type d -mindepth 1 | sort); do
faketime "2000-01-01 00:00:00" mmd -i ../firmware_part.img "::/$d"
done
for f in $(find . -type f | sort); do
mcopy -pvm -i ../firmware_part.img "$f" "::/$f"
done)
# Verify the FAT partition before copying it.
fsck.vfat -vn firmware_part.img
dd conv=notrunc if=firmware_part.img of=$img seek=$START count=$SECTORS