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

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#! @shell@ -e
# Allow the location of NixOS sources and the system configuration
# file to be overridden.
NIXOS=${NIXOS:-/etc/nixos/nixos}
NIXPKGS=${NIXPKGS:-/etc/nixos/nixpkgs}
NIXOS_CONFIG=${NIXOS_CONFIG:-/etc/nixos/configuration.nix}
export NIXPKGS # must be exported so that a non default location is passed to nixos/default.nix
showSyntax() {
# !!! more or less cut&paste from
# system/switch-to-configuration.sh (which we call, of course).
cat <<EOF
Usage: $0 [OPTIONS...] OPERATION
The operation is one of the following:
switch: make the configuration the boot default and activate now
boot: make the configuration the boot default
test: activate the configuration, but don't make it the boot default
build: build the configuration, but don't make it the default or
activate it
build-vm: build a virtual machine containing the configuration
(useful for testing)
build-vm-with-bootloader:
like build-vm, but include a boot loader in the VM
dry-run: just show what store paths would be built/downloaded
pull: just pull the Nixpkgs channel manifest and exit
Options:
--install-grub (re-)install the Grub bootloader
--no-pull don't do a nix-pull to get the latest Nixpkgs
channel manifest
--no-build-nix don't build the latest Nix from Nixpkgs before
building NixOS
--rollback restore the previous NixOS configuration (only
with switch, boot, test, build)
--fast same as --no-pull --no-build-nix --show-trace
Various nix-build options are also accepted, in particular:
--show-trace show a detailed stack trace for evaluation errors
Environment variables affecting nixos-rebuild:
\$NIXOS path to the NixOS source tree
\$NIXPKGS path to the Nixpkgs source tree
\$NIXOS_CONFIG path to the NixOS system configuration specification
EOF
exit 1
}
# Parse the command line.
extraBuildFlags=
action=
pullManifest=1
buildNix=1
rollback=
while test "$#" -gt 0; do
i="$1"; shift 1
case "$i" in
--help)
showSyntax
;;
switch|boot|test|build|dry-run|build-vm|build-vm-with-bootloader|pull)
action="$i"
;;
--install-grub)
export NIXOS_INSTALL_GRUB=1
;;
--no-pull)
pullManifest=
;;
--no-build-nix)
buildNix=
;;
--rollback)
rollback=1
;;
--show-trace|--no-build-hook|--keep-failed|-K|--keep-going|-k|--verbose|-v|--fallback)
extraBuildFlags="$extraBuildFlags $i"
;;
--max-jobs|-j|--cores)
j="$1"; shift 1
extraBuildFlags="$extraBuildFlags $i $j"
;;
--fast)
buildNix=
pullManifest=
extraBuildFlags="$extraBuildFlags --show-trace"
;;
*)
echo "$0: unknown option \`$i'"
exit 1
;;
esac
done
if test -z "$action"; then showSyntax; fi
if test "$action" = dry-run; then
extraBuildFlags="$extraBuildFlags --dry-run"
fi
if test -n "$rollback"; then
pullManifest=
buildNix=
fi
tmpDir=$(mktemp -t -d nixos-rebuild.XXXXXX)
trap 'rm -rf "$tmpDir"' EXIT
# If the Nix daemon is running, then use it. This allows us to use
# the latest Nix from Nixpkgs (below) for expression evaluation, while
# still using the old Nix (via the daemon) for actual store access.
# This matters if the new Nix in Nixpkgs has a schema change. It
# would upgrade the schema, which should only happen once we actually
# switch to the new configuration.
if initctl status nix-daemon 2>&1 | grep -q 'running'; then
export NIX_REMOTE=${NIX_REMOTE:-daemon}
fi
# Pull the manifests defined in the configuration (the "manifests"
# attribute). Wonderfully hacky.
if test -n "$pullManifest"; then
manifests=$(nix-instantiate --eval-only --xml --strict $NIXOS -A manifests \
| grep '<string' | sed 's^.*"\(.*\)".*^\1^g')
mkdir -p @stateDir@/nix/channel-cache
for i in $manifests; do
NIX_DOWNLOAD_CACHE=@stateDir@/nix/channel-cache nix-pull $i || true
done
fi
if [ "$action" = pull ]; then exit 0; fi
# First build Nix, since NixOS may require a newer version than the
# current one. Of course, the same goes for Nixpkgs, but Nixpkgs is
# more conservative.
if test -n "$buildNix"; then
echo "building Nix..." >&2
if ! nix-build $NIXOS -A config.environment.nix -o $tmpDir/nix $extraBuildFlags > /dev/null; then
if ! nix-build $NIXOS -A nixFallback -o $tmpDir/nix $extraBuildFlags > /dev/null; then
nix-build $NIXPKGS -A nixUnstable -o $tmpDir/nix $extraBuildFlags > /dev/null
fi
fi
PATH=$tmpDir/nix/bin:$PATH
fi
# Either upgrade the configuration in the system profile (for "switch"
# or "boot"), or just build it and create a symlink "result" in the
# current directory (for "build" and "test").
if test -z "$rollback"; then
echo "building the system configuration..." >&2
if test "$action" = switch -o "$action" = boot; then
nix-env -p @stateDir@/nix/profiles/system -f $NIXOS --set -A system $extraBuildFlags
pathToConfig=@stateDir@/nix/profiles/system
elif test "$action" = test -o "$action" = build -o "$action" = dry-run; then
nix-build $NIXOS -A system -K -k $extraBuildFlags > /dev/null
pathToConfig=./result
elif [ "$action" = build-vm ]; then
nix-build $NIXOS -A vm -K -k $extraBuildFlags > /dev/null
pathToConfig=./result
elif [ "$action" = build-vm-with-bootloader ]; then
nix-build $NIXOS -A vmWithBootLoader -K -k $extraBuildFlags > /dev/null
pathToConfig=./result
else
showSyntax
fi
else # test -n "$rollback"
if test "$action" = switch -o "$action" = boot; then
nix-env --rollback -p @stateDir@/nix/profiles/system
pathToConfig=@stateDir@/nix/profiles/system
elif test "$action" = test -o "$action" = build; then
systemNumber=$(
nix-env -p @stateDir@/nix/profiles/system --list-generations |
sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
)
ln -sT @stateDir@/nix/profiles/system-${systemNumber}-link ./result
pathToConfig=./result
else
showSyntax
fi
fi
# If we're not just building, then make the new configuration the boot
# default and/or activate it now.
if test "$action" = switch -o "$action" = boot -o "$action" = test; then
$pathToConfig/bin/switch-to-configuration "$action"
fi
if test "$action" = build-vm; then
cat >&2 <<EOF
Done. The virtual machine can be started by running $(echo $pathToConfig/bin/run-*-vm).
EOF
fi