195 lines
5.2 KiB
Bash
195 lines
5.2 KiB
Bash
#! @shell@
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# - [mount target device] <- currently disabled
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# - make Nix store etc.
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# - copy closure of Nix to target device
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# - register validity
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# - with a chroot to the target device:
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# * do a nix-pull
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# * nix-env -p /nix/var/nix/profiles/system -i <nix-expr for the configuration>
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# * run the activation script of the configuration (also installs Grub)
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set -e
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if test -z "$mountPoint"; then
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mountPoint=/mnt
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fi
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if test -z "$NIXOS"; then
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NIXOS=/etc/nixos/nixos
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fi
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# NIXOS_CONFIG is interpreted relative to $mountPoint.
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if test -z "$NIXOS_CONFIG"; then
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NIXOS_CONFIG=/etc/nixos/configuration.nix
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fi
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if ! test -e "$mountPoint"; then
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echo "mount point $mountPoint doesn't exist"
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exit 1
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fi
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if ! grep -F -q " $mountPoint " /proc/mounts; then
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echo "$mountPoint doesn't appear to be a mount point"
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exit 1
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fi
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if ! test -e "$NIXOS"; then
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echo "NixOS source directory $NIXOS doesn't exist"
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exit 1
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fi
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if ! test -e "$mountPoint/$NIXOS_CONFIG"; then
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echo "configuration file $mountPoint/$NIXOS_CONFIG doesn't exist"
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exit 1
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fi
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NIXOS=$(readlink -f "$NIXOS")
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# Enable networking in the chroot.
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mkdir -m 0755 -p $mountPoint/etc
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touch /etc/resolv.conf
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cp /etc/resolv.conf $mountPoint/etc/
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# Mount some stuff in the target root directory.
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mkdir -m 0755 -p $mountPoint/dev $mountPoint/proc $mountPoint/sys $mountPoint/mnt
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mount --bind /dev $mountPoint/dev
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mount --bind /proc $mountPoint/proc
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mount --bind /sys $mountPoint/sys
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mount --rbind / $mountPoint/mnt
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# Note: probably umount -l is enough. It umounts recursive mount points having been mounted by --rbind!
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# Probably umountUnder can be removed ?
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umountUnder() {
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local dir="$1"
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for i in $(grep -F " $dir" /proc/mounts \
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| @perl@/bin/perl -e 'while (<>) { /^\S+\s+(\S+)\s+/; print "$1\n"; }' \
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| sort -r);
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do
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umount $i || true
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done
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}
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cleanup() {
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umountUnder $mountPoint/mnt
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umountUnder $mountPoint/dev
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umountUnder $mountPoint/proc
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umountUnder $mountPoint/sys
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}
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trap "cleanup" EXIT
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mkdir -m 01777 -p $mountPoint/tmp
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mkdir -m 0755 -p $mountPoint/var
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# Create the necessary Nix directories on the target device, if they
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# don't already exist.
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mkdir -m 0755 -p \
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$mountPoint/nix/var/nix/gcroots \
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$mountPoint/nix/var/nix/temproots \
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$mountPoint/nix/var/nix/manifests \
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$mountPoint/nix/var/nix/userpool \
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$mountPoint/nix/var/nix/profiles \
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$mountPoint/nix/var/nix/db \
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$mountPoint/nix/var/log/nix/drvs
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mkdir -m 1777 -p \
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$mountPoint/nix/store \
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# Get the store paths to copy from the references graph.
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storePaths=$(@perl@/bin/perl @pathsFromGraph@ @nixClosure@)
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# Copy Nix to the Nix store on the target device.
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echo "copying Nix to $mountPoint...."
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for i in $storePaths; do
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echo " $i"
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rsync -a $i $mountPoint/nix/store/
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done
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# We don't have locale-archive in the chroot, so clear $LANG.
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export LANG=
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# Register the paths in the Nix closure as valid. This is necessary
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# to prevent them from being deleted the first time we install
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# something. (I.e., Nix will see that, e.g., the glibc path is not
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# valid, delete it to get it out of the way, but as a result nothing
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# will work anymore.)
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chroot $mountPoint @nix@/bin/nix-store --register-validity < @nixClosure@
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# Create the required /bin/sh symlink; otherwise lots of things
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# (notably the system() function) won't work.
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mkdir -m 0755 -p $mountPoint/bin
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# !!! assuming that @shell@ is in the closure
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ln -sf @shell@ $mountPoint/bin/sh
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# Make the build below copy paths from the CD if possible. Note that
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# /mnt in the chroot is the root of the CD.
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export NIX_OTHER_STORES=/mnt/nix:$NIX_OTHER_STORES
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# Do a nix-pull to speed up building.
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if test -n "@nixpkgsURL@" -a ${NIXOS_PULL:-1} != 0; then
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chroot $mountPoint @nix@/bin/nix-pull @nixpkgsURL@/MANIFEST || true
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fi
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if test -n "$NIXOS_PREPARE_CHROOT_ONLY"; then
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echo "User requested only to prepare chroot. Exiting."
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exit 0;
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fi
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# Build the specified Nix expression in the target store and install
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# it into the system configuration profile.
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echo "building the system configuration..."
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NIXPKGS=/mnt/etc/nixos/nixpkgs chroot $mountPoint @nix@/bin/nix-env \
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-p /nix/var/nix/profiles/system \
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-f "/mnt$NIXOS" \
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--set -A system
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# Make a backup of the old NixOS/Nixpkgs sources.
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echo "copying NixOS/Nixpkgs sources to /etc/nixos...."
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backupTimestamp=$(date "+%Y%m%d%H%M%S")
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targetNixos=$mountPoint/etc/nixos/nixos
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if test -e $targetNixos; then
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mv $targetNixos $targetNixos.backup-$backupTimestamp
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fi
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targetNixpkgs=$mountPoint/etc/nixos/nixpkgs
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if test -e $targetNixpkgs; then
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mv $targetNixpkgs $targetNixpkgs.backup-$backupTimestamp
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fi
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# Copy the NixOS/Nixpkgs sources to the target.
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cp -prd $NIXOS $targetNixos
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if test -e /etc/nixos/nixpkgs; then
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cp -prd /etc/nixos/nixpkgs $targetNixpkgs
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fi
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# Grub needs an mtab.
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ln -sfn /proc/mounts $mountPoint/etc/mtab
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# Mark the target as a NixOS installation, otherwise
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# switch-to-configuration will chicken out.
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touch $mountPoint/etc/NIXOS
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# Switch to the new system configuration. This will install Grub with
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# a menu default pointing at the kernel/initrd/etc of the new
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# configuration.
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echo "finalising the installation..."
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NIXOS_INSTALL_GRUB=1 chroot $mountPoint \
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/nix/var/nix/profiles/system/bin/switch-to-configuration boot
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