nixpkgs/modules/system/boot/loader/efi-boot-stub/efi-boot-stub-builder.sh

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#! @bash@/bin/sh -e
shopt -s nullglob
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin:$i/sbin; done
default=$1
if test -z "$1"; then
echo "Syntax: efi-boot-stub-builder.sh <DEFAULT-CONFIG>"
exit 1
fi
echo "updating the efi system partition..."
# Convert a path to a file in the Nix store such as
# /nix/store/<hash>-<name>/file to <hash>-<name>-<file>.
# Also, efi executables need the .efi extension
cleanName() {
local path="$1"
echo "$path" | sed 's|^/nix/store/||' | sed 's|/|-|g' | sed 's|@kernelFile@$|@kernelFile@.efi|'
}
# Copy a file from the Nix store to the EFI system partition
declare -A filesCopied
copyToKernelsDir() {
local src="$1"
local dst="@efiSysMountPoint@/efi/nixos/$(cleanName $src)"
# Don't copy the file if $dst already exists. This means that we
# have to create $dst atomically to prevent partially copied
# kernels or initrd if this script is ever interrupted.
if ! test -e $dst; then
local dstTmp=$dst.tmp.$$
cp $src $dstTmp
mv $dstTmp $dst
fi
filesCopied[$dst]=1
result=$dst
}
# Copy its kernel, initrd, and startup script to the efi system partition
# Add the efibootmgr entry if requested
addEntry() {
local path="$1"
local generation="$2"
if ! test -e $path/kernel -a -e $path/initrd; then
return
fi
local kernel=$(readlink -f $path/kernel)
local initrd=$(readlink -f $path/initrd)
copyToKernelsDir $kernel; kernel=$result
copyToKernelsDir $initrd; initrd=$result
local startup="@efiSysMountPoint@/efi/nixos/generation-$generation-startup.nsh"
if ! test -e $startup; then
local dstTmp=$startup.tmp.$$
echo "$(echo $kernel | sed 's|@efiSysMountPoint@||' | sed 's|/|\\|g') systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) initrd=$(echo $initrd | sed 's|@efiSysMountPoint@||' | sed 's|/|\\|g') $(cat $path/kernel-params)" > $dstTmp
mv $dstTmp $startup
fi
filesCopied[$startup]=1
if test -n "@runEfibootmgr@"; then
set +e
efibootmgr -c -d "@efiDisk@" -g -l $(echo $kernel | sed 's|@efiSysMountPoint@||' | sed 's|/|\\|g') -L "NixOS $generation Generation" -p "@efiPartition@" \
-u systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) initrd=$(echo $initrd | sed 's|@efiSysMountPoint@||' | sed 's|/|\\|g') $(cat $path/kernel-params) > /dev/null 2>&1
set -e
fi
if test $(readlink -f "$path") = "$default"; then
if test -n "@runEfibootmgr@"; then
set +e
defaultbootnum=$(efibootmgr | grep "NixOS $generation Generation" | sed 's/Boot//' | sed 's/\*.*//')
set -e
fi
if test -n "@installStartupNsh@"; then
sed 's|.*@kernelFile@.efi|@kernelFile@.efi|' < $startup > "@efiSysMountPoint@/startup.nsh"
cp $kernel "@efiSysMountPoint@/@kernelFile@.efi"
fi
fi
}
mkdir -p "@efiSysMountPoint@/efi/nixos/"
# Remove all old boot manager entries
if test -n "@runEfibootmgr@"; then
set +e
modprobe efivars > /dev/null 2>&1
for bootnum in $(efibootmgr | grep "NixOS" | grep "Generation" | sed 's/Boot//' | sed 's/\*.*//'); do
efibootmgr -B -b "$bootnum" > /dev/null 2>&1
done
set -e
fi
# Add all generations of the system profile to the system partition, in reverse
# (most recent to least recent) order.
for generation in $(
(cd /nix/var/nix/profiles && ls -d system-*-link) \
| sed 's/system-\([0-9]\+\)-link/\1/' \
| sort -n -r); do
link=/nix/var/nix/profiles/system-$generation-link
addEntry $link $generation
done
if test -n "@runEfibootmgr@"; then
set +e
efibootmgr -o $defaultbootnum > /dev/null 2>&1
set -e
fi
if test -n "@efiShell@"; then
mkdir -pv "@efiSysMountPoint@"/efi/boot
cp "@efiShell@" "@efiSysMountPoint@"/efi/boot/boot"@targetArch@".efi
fi
# Remove obsolete files from the EFI system partition
for fn in "@efiSysMountPoint@/efi/nixos/"*; do
if ! test "${filesCopied[$fn]}" = 1; then
rm -vf -- "$fn"
fi
done