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

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#! @shell@
set -e
shopt -s nullglob
export PATH=@path@:$PATH
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# Ensure a consistent umask.
umask 0022
# Parse the command line for the -I flag
extraBuildFlags=()
mountPoint=/mnt
while [ "$#" -gt 0 ]; do
i="$1"; shift 1
case "$i" in
--max-jobs|-j|--cores|-I)
j="$1"; shift 1
extraBuildFlags+=("$i" "$j")
;;
--option)
j="$1"; shift 1
k="$1"; shift 1
extraBuildFlags+=("$i" "$j" "$k")
;;
--root)
mountPoint="$1"; shift 1
;;
--closure)
# FIXME: --closure is a misnomer
system="$1"; shift 1
;;
--no-channel-copy)
noChannelCopy=1
;;
--no-root-passwd)
noRootPasswd=1
;;
--no-bootloader)
noBootLoader=1
;;
--show-trace)
extraBuildFlags+=("$i")
;;
--help)
exec man nixos-install
exit 1
;;
--debug)
set -x
;;
*)
echo "$0: unknown option \`$i'"
exit 1
;;
esac
done
if ! test -e "$mountPoint"; then
echo "mount point $mountPoint doesn't exist"
exit 1
fi
# Get the path of the NixOS configuration file.
if [[ -z $NIXOS_CONFIG ]]; then
NIXOS_CONFIG=$mountPoint/etc/nixos/configuration.nix
fi
if [[ ${NIXOS_CONFIG:0:1} != / ]]; then
echo "$0: \$NIXOS_CONFIG is not an absolute path"
exit 1
fi
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if [[ ! -e $NIXOS_CONFIG && -z $system ]]; then
echo "configuration file $NIXOS_CONFIG doesn't exist"
exit 1
fi
# A place to drop temporary stuff.
trap "rm -rf $tmpdir" EXIT
tmpdir="$(mktemp -d)"
subs="auto?trusted=1 https://cache.nixos.org/"
# Build the system configuration in the target filesystem.
if [[ -z $system ]]; then
echo "building the configuration in $NIXOS_CONFIG..."
outLink="$tmpdir/system"
nix build --out-link "$outLink" --store "$mountPoint" "${extraBuildFlags[@]}" \
--substituters "$subs" \
-f '<nixpkgs/nixos>' system -I "nixos-config=$NIXOS_CONFIG"
system=$(readlink -f $outLink)
fi
# Set the system profile to point to the configuration. TODO: combine
# this with the previous step once we have a nix-env replacement with
# a progress bar.
nix-env --store "$mountPoint" "${extraBuildFlags[@]}" \
--substituters "$subs" \
-p $mountPoint/nix/var/nix/profiles/system --set "$system"
# Copy the NixOS/Nixpkgs sources to the target as the initial contents
# of the NixOS channel.
if [[ -z $noChannelCopy ]]; then
channelPath="$(nix-env -p /nix/var/nix/profiles/per-user/root/channels -q nixos --no-name --out-path 2>/dev/null || echo -n "")"
if [[ -n $channelPath ]]; then
echo "copying channel..."
mkdir -p $mountPoint/nix/var/nix/profiles/per-user/root
nix-env --store "$mountPoint" --substituters 'auto?trusted=1' "${extraBuildFlags[@]}" \
-p $mountPoint/nix/var/nix/profiles/per-user/root/channels --set "$channelPath" --quiet
fi
fi
# Mark the target as a NixOS installation, otherwise switch-to-configuration will chicken out.
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mkdir -m 0755 "$mountPoint/etc"
touch "$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.
if [[ -z $noBootLoader ]]; then
echo "installing the boot loader..."
# Grub needs an mtab.
ln -sfn /proc/mounts $mountPoint/etc/mtab
NIXOS_INSTALL_BOOTLOADER=1 nixos-enter --root "$mountPoint" -- /run/current-system/bin/switch-to-configuration boot
fi
# Ask the user to set a root password, but only if the passwd command
# exists (i.e. when mutable user accounts are enabled).
if [[ -z $noRootPasswd ]] && [ -t 0 ]; then
nixos-enter --root "$mountPoint" -c '[[ -e /nix/var/nix/profiles/system/sw/bin/passwd ]] && echo "setting root password..." && /nix/var/nix/profiles/system/sw/bin/passwd'
fi
echo "installation finished!"