forked from mirrors/nixpkgs
dd0a951279
Add support for custom device-tree files, and applying overlays to them. This is useful for supporting non-discoverable hardware, such as sensors attached to GPIO pins on a Raspberry Pi.
141 lines
4 KiB
Bash
141 lines
4 KiB
Bash
#! @bash@/bin/sh -e
|
|
|
|
shopt -s nullglob
|
|
|
|
export PATH=/empty
|
|
for i in @path@; do PATH=$PATH:$i/bin; done
|
|
|
|
usage() {
|
|
echo "usage: $0 -t <timeout> -c <path-to-default-configuration> [-d <boot-dir>] [-g <num-generations>]" >&2
|
|
exit 1
|
|
}
|
|
|
|
timeout= # Timeout in centiseconds
|
|
default= # Default configuration
|
|
target=/boot # Target directory
|
|
numGenerations=0 # Number of other generations to include in the menu
|
|
|
|
while getopts "t:c:d:g:" opt; do
|
|
case "$opt" in
|
|
t) # U-Boot interprets '0' as infinite and negative as instant boot
|
|
if [ "$OPTARG" -lt 0 ]; then
|
|
timeout=0
|
|
elif [ "$OPTARG" = 0 ]; then
|
|
timeout=-10
|
|
else
|
|
timeout=$((OPTARG * 10))
|
|
fi
|
|
;;
|
|
c) default="$OPTARG" ;;
|
|
d) target="$OPTARG" ;;
|
|
g) numGenerations="$OPTARG" ;;
|
|
\?) usage ;;
|
|
esac
|
|
done
|
|
|
|
[ "$timeout" = "" -o "$default" = "" ] && usage
|
|
|
|
mkdir -p $target/nixos
|
|
mkdir -p $target/extlinux
|
|
|
|
# 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 $target/nixos.
|
|
declare -A filesCopied
|
|
|
|
copyToKernelsDir() {
|
|
local src=$(readlink -f "$1")
|
|
local dst="$target/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.$$
|
|
cp -r $src $dstTmp
|
|
mv $dstTmp $dst
|
|
fi
|
|
filesCopied[$dst]=1
|
|
result=$dst
|
|
}
|
|
|
|
# Copy its kernel, initrd and dtbs to $target/nixos, and echo out an
|
|
# extlinux menu entry
|
|
addEntry() {
|
|
local path=$(readlink -f "$1")
|
|
local tag="$2" # Generation number or 'default'
|
|
|
|
if ! test -e $path/kernel -a -e $path/initrd; then
|
|
return
|
|
fi
|
|
|
|
copyToKernelsDir "$path/kernel"; kernel=$result
|
|
copyToKernelsDir "$path/initrd"; initrd=$result
|
|
dtbDir=$(readlink -m "$path/dtbs")
|
|
if [ -e "$dtbDir" ]; then
|
|
copyToKernelsDir "$dtbDir"; dtbs=$result
|
|
fi
|
|
|
|
timestampEpoch=$(stat -L -c '%Z' $path)
|
|
|
|
timestamp=$(date "+%Y-%m-%d %H:%M" -d @$timestampEpoch)
|
|
nixosLabel="$(cat $path/nixos-version)"
|
|
extraParams="$(cat $path/kernel-params)"
|
|
|
|
echo
|
|
echo "LABEL nixos-$tag"
|
|
if [ "$tag" = "default" ]; then
|
|
echo " MENU LABEL NixOS - Default"
|
|
else
|
|
echo " MENU LABEL NixOS - Configuration $tag ($timestamp - $nixosLabel)"
|
|
fi
|
|
echo " LINUX ../nixos/$(basename $kernel)"
|
|
echo " INITRD ../nixos/$(basename $initrd)"
|
|
if [ -d "$dtbDir" ]; then
|
|
echo " FDTDIR ../nixos/$(basename $dtbs)"
|
|
fi
|
|
echo " APPEND systemConfig=$path init=$path/init $extraParams"
|
|
}
|
|
|
|
tmpFile="$target/extlinux/extlinux.conf.tmp.$$"
|
|
|
|
cat > $tmpFile <<EOF
|
|
# Generated file, all changes will be lost on nixos-rebuild!
|
|
|
|
# Change this to e.g. nixos-42 to temporarily boot to an older configuration.
|
|
DEFAULT nixos-default
|
|
|
|
MENU TITLE ------------------------------------------------------------
|
|
TIMEOUT $timeout
|
|
EOF
|
|
|
|
addEntry $default default >> $tmpFile
|
|
|
|
if [ "$numGenerations" -gt 0 ]; then
|
|
# Add up to $numGenerations 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 \
|
|
| head -n $numGenerations); do
|
|
link=/nix/var/nix/profiles/system-$generation-link
|
|
addEntry $link $generation
|
|
done >> $tmpFile
|
|
fi
|
|
|
|
mv -f $tmpFile $target/extlinux/extlinux.conf
|
|
|
|
# Remove obsolete files from $target/nixos.
|
|
for fn in $target/nixos/*; do
|
|
if ! test "${filesCopied[$fn]}" = 1; then
|
|
echo "Removing no longer needed boot file: $fn"
|
|
chmod +w -- "$fn"
|
|
rm -rf -- "$fn"
|
|
fi
|
|
done
|