133 lines
3.7 KiB
Bash
133 lines
3.7 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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usage() {
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echo "usage: $0 -c <path-to-default-configuration> [-d <boot-dir>]" >&2
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exit 1
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}
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default= # Default configuration
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target=/boot # Target directory
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while getopts "c:d:" opt; do
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case "$opt" in
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c) default="$OPTARG" ;;
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d) target="$OPTARG" ;;
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\?) usage ;;
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esac
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done
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echo "updating the boot generations directory..."
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mkdir -p $target/old
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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 $target/kernels.
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declare -A filesCopied
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copyToKernelsDir() {
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local src="$1"
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local dst="$target/old/$(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 $dst
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}
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outdir=$target/old
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mkdir -p $outdir || true
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# Copy its kernel and initrd to $target/old.
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addEntry() {
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local path="$1"
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local generation="$2"
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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 $path/initrd)
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local dtb_path=$(readlink -f $path/kernel-modules/dtbs)
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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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echo $(readlink -f $path) > $outdir/$generation-system
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echo $(readlink -f $path/init) > $outdir/$generation-init
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cp $path/kernel-params $outdir/$generation-cmdline.txt
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echo $initrd > $outdir/$generation-initrd
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echo $kernel > $outdir/$generation-kernel
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if test "$generation" = "default"; then
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copyForced $kernel $target/kernel.img
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copyForced $initrd $target/initrd
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for dtb in $dtb_path/{broadcom,}/bcm*.dtb; do
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dst="$target/$(basename $dtb)"
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copyForced $dtb "$dst"
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filesCopied[$dst]=1
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done
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cp "$(readlink -f "$path/init")" $target/nixos-init
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echo "`cat $path/kernel-params` init=$path/init" >$target/cmdline.txt
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fi
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}
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addEntry $default default
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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
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done
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# Add the firmware files
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fwdir=@firmware@/share/raspberrypi/boot/
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copyForced $fwdir/bootcode.bin $target/bootcode.bin
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copyForced $fwdir/fixup.dat $target/fixup.dat
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copyForced $fwdir/fixup_cd.dat $target/fixup_cd.dat
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copyForced $fwdir/fixup_db.dat $target/fixup_db.dat
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copyForced $fwdir/fixup_x.dat $target/fixup_x.dat
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copyForced $fwdir/start.elf $target/start.elf
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copyForced $fwdir/start_cd.elf $target/start_cd.elf
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copyForced $fwdir/start_db.elf $target/start_db.elf
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copyForced $fwdir/start_x.elf $target/start_x.elf
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# Add the config.txt
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copyForced @configTxt@ $target/config.txt
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# Remove obsolete files from $target and $target/old.
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for fn in $target/old/*linux* $target/old/*initrd-initrd* $target/bcm*.dtb; do
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if ! test "${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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