147 lines
4.0 KiB
Bash
Executable File
147 lines
4.0 KiB
Bash
Executable File
#! @bash@/bin/sh -e
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shopt -s nullglob
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export PATH=/empty:@path@
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# used to track copied files to decide which are obsolete
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# and need to be removed
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declare -A filesCopied
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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 `kernelsDir`.
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copyToKernelsDir() {
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local src="$1"
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local kernelsDir="$2"
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local dst="$kernelsDir/$(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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copyForced() {
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local src="$1"
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local dst="$2"
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cp $src $dst.tmp
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mv $dst.tmp $dst
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}
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# Copy generation's kernel and initrd to `kernelsDir`.
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# Default generation's are also copied to `outdir`
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addEntry() {
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local generationPath="$1"
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local generationName="$2"
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local outdir="$3"
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local kernelsDir="$4"
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if ! test -e $generationPath/kernel -a -e $generationPath/initrd; then
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return
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fi
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local kernel=$(readlink -f $generationPath/kernel)
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local initrd=$(readlink -f $generationPath/initrd)
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if test "1" = "@copyKernels@"; then
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copyToKernelsDir $kernel $kernelsDir; kernel=$result
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copyToKernelsDir $initrd $kernelsDir; initrd=$result
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fi
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echo $(readlink -f $generationPath) > $kernelsDir/$generationName-system
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echo $(readlink -f $generationPath/init) > $kernelsDir/$generationName-init
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cp $generationPath/kernel-params $kernelsDir/$generationName-cmdline.txt
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echo $initrd > $kernelsDir/$generationName-initrd
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echo $kernel > $kernelsDir/$generationName-kernel
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if test "$generationName" = "default"; then
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copyForced $kernel $outdir/kernel.img
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copyForced $initrd $outdir/initrd
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cp "$(readlink -f "$generationPath/init")" $outdir/nixos-init
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echo "`cat $generationPath/kernel-params` init=$generationPath/init" >$outdir/cmdline.txt
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fi
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}
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removeObsolete() {
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local path="$1"
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# Remove obsolete files from $path and $path/old.
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for fn in $path/*linux* $path/*initrd-initrd*; do
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if ! test "${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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}
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addAllEntries() {
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local defaultGenerationPath="$1"
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local outdir="$2"
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local kernelsDir="$outdir/nixos-kernels"
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mkdir -p $kernelsDir || true
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# Add default generation
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addEntry $defaultGenerationPath default $outdir $kernelsDir
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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 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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addEntry $link $generation $outdir $kernelsDir
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done
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removeObsolete $kernelsDir
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}
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usage() {
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echo "usage: $0 -c <path-to-default-configuration> [-d <boot-dir>]" >&2
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exit 1
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}
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default= # Default configuration
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echo "kernelboot-builder: $@"
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while getopts "c:b:f:" opt; do
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case "$opt" in
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c) default="$OPTARG" ;;
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b) boottarget="$OPTARG" ;;
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f) fwtarget="$OPTARG" ;;
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\?) usage ;;
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esac
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done
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if [ -z "$boottarget" ] && [ -z "$fwtarget" ]; then
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echo "Error: at least one of \`-b <boot-dir>\` and \`-f <firmware-dir>\` must be set"
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usage
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fi
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if [ -n "$fwtarget" ]; then
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@firmwareBuilder@ -c $default -d $fwtarget
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echo "updating the boot generations directory..."
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addAllEntries $default $fwtarget
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fi
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if [ -n "$boottarget" ]; then
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echo "'-b $boottarget' isn't used when loading the kernel directly with kernelboot: \
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kernels are copied directly to <firmware-dir>"
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fi
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echo "kernelboot bootloader installed" |