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#! @bash@/bin/sh
# This can end up being called disregarding the shebang.
set -e
shopt -s nullglob
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin; done
usage() {
echo "usage: $0 -c <path-to-default-configuration> [-d <boot-dir>]" >&2
exit 1
}
default= # Default configuration
target=/boot # Target directory
while getopts "c:d:" opt; do
case "$opt" in
c) default="$OPTARG" ;;
d) target="$OPTARG" ;;
\?) usage ;;
esac
done
echo "updating the boot generations directory..."
mkdir -p $target/old
# Convert a path to a file in the Nix store such as
# /nix/store/<hash>-<name>/file to <hash>-<name>-<file>.
cleanName() {
local path="$1"
echo "$path" | sed 's|^/nix/store/||' | sed 's|/|-|g'
}
# Copy a file from the Nix store to $target/kernels.
declare -A filesCopied
copyToKernelsDir() {
local src="$1"
local dst="$target/old/$(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
}
copyForced() {
local src="$1"
local dst="$2"
cp $src $dst.tmp
mv $dst.tmp $dst
}
outdir=$target/old
mkdir -p $outdir || true
# Copy its kernel and initrd to $target/old.
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 $path/initrd)
local dtb_path=$(readlink -f $path/dtbs)
if test -n "@copyKernels@"; then
copyToKernelsDir $kernel; kernel=$result
copyToKernelsDir $initrd; initrd=$result
fi
echo $(readlink -f $path) > $outdir/$generation-system
echo $(readlink -f $path/init) > $outdir/$generation-init
cp $path/kernel-params $outdir/$generation-cmdline.txt
echo $initrd > $outdir/$generation-initrd
echo $kernel > $outdir/$generation-kernel
if test "$generation" = "default"; then
copyForced $kernel $target/kernel.img
copyForced $initrd $target/initrd
for dtb in $dtb_path/{broadcom,}/bcm*.dtb; do
dst="$target/$(basename $dtb)"
copyForced $dtb "$dst"
filesCopied[$dst]=1
done
cp "$(readlink -f "$path/init")" $target/nixos-init
echo "`cat $path/kernel-params` init=$path/init" >$target/cmdline.txt
fi
}
addEntry $default default
# Add all generations of the system profile to the menu, 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
# Add the firmware files
fwdir=@firmware@/share/raspberrypi/boot/
copyForced $fwdir/bootcode.bin $target/bootcode.bin
copyForced $fwdir/fixup.dat $target/fixup.dat
copyForced $fwdir/fixup4.dat $target/fixup4.dat
copyForced $fwdir/fixup4cd.dat $target/fixup4cd.dat
copyForced $fwdir/fixup4db.dat $target/fixup4db.dat
copyForced $fwdir/fixup4x.dat $target/fixup4x.dat
copyForced $fwdir/fixup_cd.dat $target/fixup_cd.dat
copyForced $fwdir/fixup_db.dat $target/fixup_db.dat
copyForced $fwdir/fixup_x.dat $target/fixup_x.dat
copyForced $fwdir/start.elf $target/start.elf
copyForced $fwdir/start4.elf $target/start4.elf
copyForced $fwdir/start4cd.elf $target/start4cd.elf
copyForced $fwdir/start4db.elf $target/start4db.elf
copyForced $fwdir/start4x.elf $target/start4x.elf
copyForced $fwdir/start_cd.elf $target/start_cd.elf
copyForced $fwdir/start_db.elf $target/start_db.elf
copyForced $fwdir/start_x.elf $target/start_x.elf
# Add the config.txt
copyForced @configTxt@ $target/config.txt
# Remove obsolete files from $target and $target/old.
for fn in $target/old/*linux* $target/old/*initrd-initrd* $target/bcm*.dtb; do
if ! test "${filesCopied[$fn]}" = 1; then
rm -vf -- "$fn"
fi
done
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