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