nixpkgs/modules/installer/tools/nixos-install.sh

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