122 lines
3.8 KiB
Bash
122 lines
3.8 KiB
Bash
#! @shell@ -e
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# Allow the location of NixOS sources and the system configuration
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# file to be overridden.
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NIXOS=${NIXOS:-/etc/nixos/nixos}
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NIXPKGS=${NIXPKGS:-/etc/nixos/nixpkgs}
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NIXOS_CONFIG=${NIXOS_CONFIG:-/etc/nixos/configuration.nix}
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export NIXPKGS # must be exported so that a non default location is passed to nixos/default.nix
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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: $0 [switch|boot|test|build|dry-run]
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switch: make the configuration the boot default and activate now
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boot: make the configuration the boot default
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test: activate the configuration, but don't make it the boot default
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build: build the configuration, but don't make it the default or
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activate it
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dry-run: just show what store paths would be built/downloaded
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Environment variables affecting nixos-rebuild:
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Path to NixOS: NIXOS=${NIXOS}
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Path to Nixpkgs: NIXPKGS=${NIXPKGS}
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Path to configuration: NIXOS_CONFIG=${NIXOS_CONFIG}
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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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for i in "$@"; do
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if test "$i" = "--help"; then
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showSyntax
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elif test "$i" = switch -o "$i" = boot -o "$i" = test -o "$i" = build -o "$i" = dry-run; then
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action="$i"
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else
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echo "$0: unknown option \`$i'"
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exit 1
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fi
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done
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if test -z "$action"; then showSyntax; fi
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if test "$action" = dry-run; then
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extraBuildFlags="$extraBuildFlags --dry-run"
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fi
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# If the Nix daemon is running, then use it. This allows us to use
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# the latest Nix from Nixpkgs (below) for expression evaluation, while
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# still using the old Nix (via the daemon) for actual store access.
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# This matters if the new Nix in Nixpkgs has a schema change. It
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# would upgrade the schema, which should only happen once we actually
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# switch to the new configuration.
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if initctl status nix-daemon 2>&1 | grep -q ' running'; then
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export NIX_REMOTE=${NIX_REMOTE:-daemon}
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fi
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# Pull the manifests defined in the configuration (the "manifests"
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# attribute). Wonderfully hacky.
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if test "${NIXOS_PULL:-1}" != 0; then
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manifests=$(nix-instantiate --eval-only --xml --strict $NIXOS -A manifests \
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| grep '<string' | sed 's^.*"\(.*\)".*^\1^g')
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mkdir -p /nix/var/nix/channel-cache
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for i in $manifests; do
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NIX_DOWNLOAD_CACHE=/nix/var/nix/channel-cache nix-pull $i || true
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done
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fi
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# First build Nix, since NixOS may require a newer version than the
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# current one. Of course, the same goes for Nixpkgs, but Nixpkgs is
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# more conservative.
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if test "${NIXOS_BUILD_NIX:-1}" != 0; then
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if ! nix-build $NIXOS -A nixFallback -o $HOME/nix-tmp; then
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nix-build $NIXPKGS -A nixUnstable -o $HOME/nix-tmp
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fi
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PATH=$HOME/nix-tmp/bin:$PATH
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fi
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# Either upgrade the configuration in the system profile (for "switch"
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# or "boot"), or just build it and create a symlink "result" in the
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# current directory (for "build" and "test").
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if test "$action" = switch -o "$action" = boot; then
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nix-env -p /nix/var/nix/profiles/system -f $NIXOS --set -A system $extraBuildFlags
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pathToConfig=/nix/var/nix/profiles/system
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elif test "$action" = test -o "$action" = build -o "$action" = dry-run; then
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nix-build $NIXOS -A system -K -k $extraBuildFlags
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pathToConfig=./result
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else
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showSyntax
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fi
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# If we're not just building, then make the new configuration the boot
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# default and/or activate it now.
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if test "$action" = switch -o "$action" = boot -o "$action" = test; then
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$pathToConfig/bin/switch-to-configuration "$action"
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fi
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if test "$action" = "test"; then
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cat >&2 <<EOF
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Warning: if you remove or overwrite the symlink \`$pathToConfig', the
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active system configuration may be garbage collected! This may render
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the system inoperable (though a reboot will fix things).
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EOF
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fi
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rm -f $HOME/nix-tmp
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