nixpkgs/nixos/modules/installer/tools/nixos-install.sh
misuzu 5700232c3f nixos/nixos-installer: use temporary directory on target filesystem
nix build should store it's temporary files on target filesystem.
This should fix 'No space left on device' on systems
with low amount of RAM when there is a need to build something
like Linux kernel
2020-04-25 14:37:36 +03:00

148 lines
4.3 KiB
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#! @shell@
set -e
shopt -s nullglob
export PATH=@path@:$PATH
# Ensure a consistent umask.
umask 0022
# Parse the command line for the -I flag
extraBuildFlags=()
mountPoint=/mnt
channelPath=
system=
while [ "$#" -gt 0 ]; do
i="$1"; shift 1
case "$i" in
--max-jobs|-j|--cores|-I|--substituters)
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
;;
--system|--closure)
system="$1"; shift 1
;;
--channel)
channelPath="$1"; shift 1
;;
--no-channel-copy)
noChannelCopy=1
;;
--no-root-passwd)
noRootPasswd=1
;;
--no-bootloader)
noBootLoader=1
;;
--show-trace)
extraBuildFlags+=("$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
if [[ ! -e $NIXOS_CONFIG && -z $system ]]; then
echo "configuration file $NIXOS_CONFIG doesn't exist"
exit 1
fi
# A place to drop temporary stuff.
tmpdir="$(mktemp -d -p $mountPoint)"
trap "rm -rf $tmpdir" EXIT
# store temporary files on target filesystem by default
export TMPDIR=${TMPDIR:-$tmpdir}
sub="auto?trusted=1"
# 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" "${extraBuildFlags[@]}" \
--extra-substituters "$sub" \
-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" "${extraBuildFlags[@]}" \
--extra-substituters "$sub" \
-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
if [[ -z $channelPath ]]; then
channelPath="$(nix-env -p /nix/var/nix/profiles/per-user/root/channels -q nixos --no-name --out-path 2>/dev/null || echo -n "")"
fi
if [[ -n $channelPath ]]; then
echo "copying channel..."
mkdir -p $mountPoint/nix/var/nix/profiles/per-user/root
nix-env --store "$mountPoint" "${extraBuildFlags[@]}" --extra-substituters "$sub" \
-p $mountPoint/nix/var/nix/profiles/per-user/root/channels --set "$channelPath" --quiet
install -m 0700 -d $mountPoint/root/.nix-defexpr
ln -sfn /nix/var/nix/profiles/per-user/root/channels $mountPoint/root/.nix-defexpr/channels
fi
fi
# Mark the target as a NixOS installation, otherwise switch-to-configuration will chicken out.
mkdir -m 0755 -p "$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!"