nixpkgs/installer/grub-menu-builder.sh

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#! @bash@/bin/sh -e
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin; done
default=$1
if test -z "$1"; then
echo "Syntax: grub-menu-builder.sh <DEFAULT-CONFIG>"
exit 1
fi
target=/boot/grub/menu.lst
tmp=$target.tmp
cat > $tmp << GRUBEND
# Automatically generated. DO NOT EDIT THIS FILE!
default=0
timeout=5
GRUBEND
addEntry() {
name="$1"
path="$2"
cat >> $tmp << GRUBEND
title $name
GRUBEND
#cat $path/menu.lst >> $tmp
grep -v "title \|default=\|timeout=" < $path/menu.lst >> $tmp
}
if test -n "$tmp"; then
addEntry "NixOS - Default" $default
fi
# 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
echo $generation
link=/nix/var/nix/profiles/system-$generation-link
date=$(stat --printf="%y\n" $link | sed 's/\..*//')
addEntry "NixOS - Configuration $generation ($date)" $link
done
cp $tmp $target