184 lines
4.6 KiB
Bash
184 lines
4.6 KiB
Bash
#! @bash@/bin/sh -e
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shopt -s nullglob
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export PATH=/empty
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for i in @path@; do PATH=$PATH:$i/bin; done
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default=$1
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if test -z "$1"; then
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echo "Syntax: grub-menu-builder.sh <DEFAULT-CONFIG>"
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exit 1
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fi
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bootMount="@bootMount@"
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if test -z "$bootMount"; then bootMount=/boot; fi
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echo "updating the GRUB menu..."
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target=/boot/grub/menu.lst
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tmp=$target.tmp
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cat > $tmp << GRUBEND
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# Automatically generated. DO NOT EDIT THIS FILE!
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default 0
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timeout 5
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GRUBEND
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if test -n "@grubSplashImage@"; then
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splashLocation=@grubSplashImage@
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# Splash images in /nix/store don't seem to work, so copy them.
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cp -f $splashLocation /boot/background.xpm.gz
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splashLocation="$bootMount/background.xpm.gz"
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echo "splashimage $splashLocation" >> $tmp
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fi
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configurationCounter=0
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configurationLimit="@configurationLimit@"
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numAlienEntries=`cat <<EOF | egrep '^[[:space:]]*title' | wc -l
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@extraGrubEntries@
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EOF`
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if test $((configurationLimit+numAlienEntries)) -gt 190; then
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configurationLimit=$((190-numAlienEntries));
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fi
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# Convert a path to a file in the Nix store such as
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# /nix/store/<hash>-<name>/file to <hash>-<name>-<file>.
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cleanName() {
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local path="$1"
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echo "$path" | sed 's|^/nix/store/||' | sed 's|/|-|g'
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}
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# Copy a file from the Nix store to /boot/kernels.
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declare -A filesCopied
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copyToKernelsDir() {
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local src="$1"
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local dst="/boot/kernels/$(cleanName $src)"
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# Don't copy the file if $dst already exists. This means that we
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# have to create $dst atomically to prevent partially copied
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# kernels or initrd if this script is ever interrupted.
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if ! test -e $dst; then
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local dstTmp=$dst.tmp.$$
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cp $src $dstTmp
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mv $dstTmp $dst
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fi
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filesCopied[$dst]=1
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result=$dst
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}
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# Add an entry for a configuration to the Grub menu, and if
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# appropriate, copy its kernel and initrd to /boot/kernels.
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addEntry() {
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local name="$1"
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local path="$2"
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local shortSuffix="$3"
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configurationCounter=$((configurationCounter + 1))
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if test $configurationCounter -gt @configurationLimit@; then
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return
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fi
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if ! test -e $path/kernel -a -e $path/initrd; then
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return
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fi
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local kernel=$(readlink -f $path/kernel)
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local initrd=$(readlink -f $path/initrd)
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if test "$path" = "$default"; then
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cp "$kernel" /boot/nixos-kernel
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cp "$initrd" /boot/nixos-initrd
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cp "$(readlink -f "$path/init")" /boot/nixos-init
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cat > /boot/nixos-grub-config <<EOF
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title Emergency boot
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kernel ${bootMount:-/boot}/nixos-kernel systemConfig=$(readlink -f "$path") init=/boot/nixos-init $(cat "$path/kernel-params")
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initrd ${bootMount:-/boot}/nixos-initrd
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EOF
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fi
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if test -n "@copyKernels@"; then
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copyToKernelsDir $kernel; kernel=$result
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copyToKernelsDir $initrd; initrd=$result
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fi
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if test -n "$bootMount"; then
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kernel=$(echo $kernel | sed -e "s^/boot^$bootMount^")
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initrd=$(echo $initrd | sed -e "s^/boot^$bootMount^")
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fi
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local confName=$(if test -e $path/configuration-name; then
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cat $path/configuration-name;
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fi)
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if test -n "$confName"; then
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name="$confName $3"
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fi
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cat >> $tmp << GRUBEND
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title $name
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kernel $kernel systemConfig=$(readlink -f $path) init=$(readlink -f $path/init) $(cat $path/kernel-params)
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initrd $initrd
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GRUBEND
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}
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if test -n "@copyKernels@"; then
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mkdir -p /boot/kernels
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fi
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# Additional entries specified verbatim by the configuration.
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extraGrubEntries=`cat <<EOF
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@extraGrubEntries@
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EOF`
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if test -n "@extraGrubEntriesBeforeNixos@"; then
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echo "$extraGrubEntries" >> $tmp
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fi
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addEntry "NixOS - Default" $default ""
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if test -z "@extraGrubEntriesBeforeNixos@"; then
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echo "$extraGrubEntries" >> $tmp
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fi
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# Add all generations of the system profile to the menu, in reverse
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# (most recent to least recent) order.
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for link in $((ls -d $default/fine-tune/* ) | sort -n); do
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date=$(stat --printf="%y\n" $link | sed 's/\..*//')
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addEntry "NixOS - variation" $link ""
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done
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for generation in $(
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(cd /nix/var/nix/profiles && ls -d system-*-link) \
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| sed 's/system-\([0-9]\+\)-link/\1/' \
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| sort -n -r); do
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link=/nix/var/nix/profiles/system-$generation-link
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date=$(stat --printf="%y\n" $link | sed 's/\..*//')
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kernelVersion=$(cd $(dirname $(readlink -f $link/kernel))/lib/modules && echo *)
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addEntry "NixOS - Configuration $generation ($date - $kernelVersion)" $link "$generation ($date)"
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done
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# Atomically update /boot/grub/menu.lst. !!! should do an fsync()
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# here on $tmp, especially on ext4.
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mv $tmp $target
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# Remove obsolete files from /boot/kernels.
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for fn in /boot/kernels/*; do
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if ! test "${filesCopied[$fn]}" = 1; then
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rm -vf -- "$fn"
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fi
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done
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