106 lines
2.8 KiB
Bash
106 lines
2.8 KiB
Bash
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#! @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 "$1"; then
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echo "Syntax: generations-dir-builder.sh <DEFAULT-CONFIG>"
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exit 1
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fi
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echo "updating the boot generations directory..."
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mkdir -p /boot
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rm -Rf /boot/system* || true
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target=/boot/grub/menu.lst
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tmp=$target.tmp
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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 path="$1"
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local generation="$2"
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local outdir=/boot/system-$generation
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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 -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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mkdir -p $outdir
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ln -sf $(readlink -f $path) $outdir/system
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ln -sf $(readlink -f $path/init) $outdir/init
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ln -sf $(readlink -f $path/initrd) $outdir/initrd
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ln -sf $(readlink -f $path/kernel) $outdir/kernel
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if test $(readlink -f "$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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mkdir -p /boot/default
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ln -sf $(readlink -f $path) /boot/default/system
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ln -sf $(readlink -f $path/init) /boot/default/init
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ln -sf $(readlink -f $path/initrd) /boot/default/initrd
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ln -sf $(readlink -f $path/kernel) /boot/default/kernel
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fi
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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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# 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 $generation
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done
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# Remove obsolete files from /boot/kernels.
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for fn in /boot/kernels/*; do
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if ! test "${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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