mirror of
https://github.com/NixOS/nixpkgs.git
synced 2025-01-29 08:14:19 +00:00
611e9302f9
When a NixOS system uses flakes, i.e., /etc/nixos/flake.nix exists, it
is impossible to use nixos-rebuild to build a pre-flake
configuration.nix. Of course, one can directly use nix command to
build the configuration, but not everybody remembers the correct nix
options to do that.
With the new option, it is possible to build a pre-flake configuration
with command like this:
nixos-rebuild build-vm -I nixos-config=./vm.nix --no-flake
The option might be useful for people following older pre-flake
tutorials on a flake-based system.
562 lines
18 KiB
Bash
Executable File
562 lines
18 KiB
Bash
Executable File
#! @runtimeShell@
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# shellcheck shell=bash
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if [ -x "@runtimeShell@" ]; then export SHELL="@runtimeShell@"; fi;
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set -e
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set -o pipefail
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shopt -s inherit_errexit
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export PATH=@path@:$PATH
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showSyntax() {
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exec man nixos-rebuild
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exit 1
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}
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# Parse the command line.
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origArgs=("$@")
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copyClosureFlags=()
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extraBuildFlags=()
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lockFlags=()
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flakeFlags=()
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action=
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buildNix=1
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fast=
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rollback=
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upgrade=
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upgrade_all=
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profile=/nix/var/nix/profiles/system
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buildHost=localhost
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targetHost=
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remoteSudo=
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verboseScript=
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noFlake=
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# comma separated list of vars to preserve when using sudo
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preservedSudoVars=NIXOS_INSTALL_BOOTLOADER
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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|edit|dry-build|dry-run|dry-activate|build-vm|build-vm-with-bootloader)
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if [ "$i" = dry-run ]; then i=dry-build; fi
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action="$i"
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;;
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--install-grub)
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echo "$0: --install-grub deprecated, use --install-bootloader instead" >&2
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export NIXOS_INSTALL_BOOTLOADER=1
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;;
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--install-bootloader)
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export NIXOS_INSTALL_BOOTLOADER=1
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;;
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--no-build-nix)
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buildNix=
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;;
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--rollback)
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rollback=1
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;;
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--upgrade)
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upgrade=1
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;;
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--upgrade-all)
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upgrade=1
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upgrade_all=1
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;;
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--use-substitutes|-s)
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copyClosureFlags+=("$i")
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;;
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-I|--max-jobs|-j|--cores|--builders)
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j="$1"; shift 1
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extraBuildFlags+=("$i" "$j")
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;;
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-j*|--quiet|--print-build-logs|-L|--no-build-output|-Q| --show-trace|--keep-going|-k|--keep-failed|-K|--fallback|--refresh|--repair|--impure|--offline|--no-net)
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extraBuildFlags+=("$i")
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;;
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--verbose|-v|-vv|-vvv|-vvvv|-vvvvv)
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verboseScript="true"
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extraBuildFlags+=("$i")
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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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fast=1
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;;
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--profile-name|-p)
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if [ -z "$1" ]; then
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echo "$0: ‘--profile-name’ requires an argument"
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exit 1
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fi
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if [ "$1" != system ]; then
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profile="/nix/var/nix/profiles/system-profiles/$1"
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mkdir -p -m 0755 "$(dirname "$profile")"
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fi
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shift 1
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;;
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--build-host|h)
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buildHost="$1"
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shift 1
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;;
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--target-host|t)
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targetHost="$1"
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shift 1
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;;
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--use-remote-sudo)
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remoteSudo=1
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;;
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--flake)
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flake="$1"
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flakeFlags=(--extra-experimental-features 'nix-command flakes')
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shift 1
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;;
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--no-flake)
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noFlake=1
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;;
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--recreate-lock-file|--no-update-lock-file|--no-write-lock-file|--no-registries|--commit-lock-file)
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lockFlags+=("$i")
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;;
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--update-input)
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j="$1"; shift 1
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lockFlags+=("$i" "$j")
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;;
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--override-input)
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j="$1"; shift 1
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k="$1"; shift 1
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lockFlags+=("$i" "$j" "$k")
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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 [[ -n "$SUDO_USER" || -n $remoteSudo ]]; then
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maybeSudo=(sudo --preserve-env="$preservedSudoVars" --)
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fi
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if [[ -z "$buildHost" && -n "$targetHost" ]]; then
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buildHost="$targetHost"
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fi
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if [ "$targetHost" = localhost ]; then
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targetHost=
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fi
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if [ "$buildHost" = localhost ]; then
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buildHost=
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fi
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# log the given argument to stderr if verbose mode is on
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logVerbose() {
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if [ -n "$verboseScript" ]; then
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echo "$@" >&2
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fi
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}
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# Run a command, logging it first if verbose mode is on
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runCmd() {
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logVerbose "$" "$@"
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"$@"
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}
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buildHostCmd() {
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if [ -z "$buildHost" ]; then
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runCmd "$@"
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elif [ -n "$remoteNix" ]; then
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runCmd ssh $SSHOPTS "$buildHost" "${maybeSudo[@]}" env PATH="$remoteNix":'$PATH' "$@"
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else
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runCmd ssh $SSHOPTS "$buildHost" "${maybeSudo[@]}" "$@"
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fi
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}
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targetHostCmd() {
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if [ -z "$targetHost" ]; then
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runCmd "${maybeSudo[@]}" "$@"
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else
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runCmd ssh $SSHOPTS "$targetHost" "${maybeSudo[@]}" "$@"
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fi
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}
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copyToTarget() {
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if ! [ "$targetHost" = "$buildHost" ]; then
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if [ -z "$targetHost" ]; then
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logVerbose "Running nix-copy-closure with these NIX_SSHOPTS: $SSHOPTS"
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NIX_SSHOPTS=$SSHOPTS runCmd nix-copy-closure "${copyClosureFlags[@]}" --from "$buildHost" "$1"
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elif [ -z "$buildHost" ]; then
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logVerbose "Running nix-copy-closure with these NIX_SSHOPTS: $SSHOPTS"
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NIX_SSHOPTS=$SSHOPTS runCmd nix-copy-closure "${copyClosureFlags[@]}" --to "$targetHost" "$1"
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else
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buildHostCmd nix-copy-closure "${copyClosureFlags[@]}" --to "$targetHost" "$1"
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fi
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fi
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}
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nixBuild() {
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logVerbose "Building in legacy (non-flake) mode."
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if [ -z "$buildHost" ]; then
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logVerbose "No --build-host given, running nix-build locally"
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runCmd nix-build "$@"
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else
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logVerbose "buildHost set to \"$buildHost\", running nix-build remotely"
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local instArgs=()
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local buildArgs=()
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local drv=
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while [ "$#" -gt 0 ]; do
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local i="$1"; shift 1
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case "$i" in
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-o)
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local out="$1"; shift 1
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buildArgs+=("--add-root" "$out" "--indirect")
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;;
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-A)
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local j="$1"; shift 1
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instArgs+=("$i" "$j")
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;;
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-I) # We don't want this in buildArgs
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shift 1
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;;
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--no-out-link) # We don't want this in buildArgs
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;;
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"<"*) # nix paths
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instArgs+=("$i")
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;;
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*)
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buildArgs+=("$i")
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;;
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esac
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done
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drv="$(runCmd nix-instantiate "${instArgs[@]}" "${extraBuildFlags[@]}")"
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if [ -a "$drv" ]; then
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logVerbose "Running nix-copy-closure with these NIX_SSHOPTS: $SSHOPTS"
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NIX_SSHOPTS=$SSHOPTS runCmd nix-copy-closure --to "$buildHost" "$drv"
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buildHostCmd nix-store -r "$drv" "${buildArgs[@]}"
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else
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echo "nix-instantiate failed"
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exit 1
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fi
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fi
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}
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nixFlakeBuild() {
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logVerbose "Building in flake mode."
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if [[ -z "$buildHost" && -z "$targetHost" && "$action" != switch && "$action" != boot ]]
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then
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runCmd nix "${flakeFlags[@]}" build "$@"
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readlink -f ./result
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elif [ -z "$buildHost" ]; then
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runCmd nix "${flakeFlags[@]}" build "$@" --out-link "${tmpDir}/result"
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readlink -f "${tmpDir}/result"
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else
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local attr="$1"
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shift 1
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local evalArgs=()
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local buildArgs=()
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local drv=
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while [ "$#" -gt 0 ]; do
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local i="$1"; shift 1
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case "$i" in
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--recreate-lock-file|--no-update-lock-file|--no-write-lock-file|--no-registries|--commit-lock-file)
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evalArgs+=("$i")
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;;
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--update-input)
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local j="$1"; shift 1
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evalArgs+=("$i" "$j")
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;;
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--override-input)
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local j="$1"; shift 1
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local k="$1"; shift 1
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evalArgs+=("$i" "$j" "$k")
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;;
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--impure) # We don't want this in buildArgs, it's only needed at evaluation time, and unsupported during realisation
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;;
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*)
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buildArgs+=("$i")
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;;
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esac
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done
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drv="$(runCmd nix "${flakeFlags[@]}" eval --raw "${attr}.drvPath" "${evalArgs[@]}" "${extraBuildFlags[@]}")"
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if [ -a "$drv" ]; then
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logVerbose "Running nix with these NIX_SSHOPTS: $SSHOPTS"
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NIX_SSHOPTS=$SSHOPTS runCmd nix "${flakeFlags[@]}" copy --derivation --to "ssh://$buildHost" "$drv"
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buildHostCmd nix-store -r "$drv" "${buildArgs[@]}"
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else
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echo "nix eval failed"
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exit 1
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fi
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fi
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}
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if [ -z "$action" ]; then showSyntax; fi
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# Only run shell scripts from the Nixpkgs tree if the action is
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# "switch", "boot", or "test". With other actions (such as "build"),
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# the user may reasonably expect that no code from the Nixpkgs tree is
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# executed, so it's safe to run nixos-rebuild against a potentially
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# untrusted tree.
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canRun=
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if [[ "$action" = switch || "$action" = boot || "$action" = test ]]; then
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canRun=1
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fi
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# If ‘--upgrade’ or `--upgrade-all` is given,
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# run ‘nix-channel --update nixos’.
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if [[ -n $upgrade && -z $_NIXOS_REBUILD_REEXEC && -z $flake ]]; then
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# If --upgrade-all is passed, or there are other channels that
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# contain a file called ".update-on-nixos-rebuild", update them as
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# well. Also upgrade the nixos channel.
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for channelpath in /nix/var/nix/profiles/per-user/root/channels/*; do
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channel_name=$(basename "$channelpath")
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if [[ "$channel_name" == "nixos" ]]; then
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runCmd nix-channel --update "$channel_name"
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elif [ -e "$channelpath/.update-on-nixos-rebuild" ]; then
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runCmd nix-channel --update "$channel_name"
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elif [[ -n $upgrade_all ]] ; then
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runCmd nix-channel --update "$channel_name"
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fi
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done
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fi
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# Make sure that we use the Nix package we depend on, not something
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# else from the PATH for nix-{env,instantiate,build}. This is
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# important, because NixOS defaults the architecture of the rebuilt
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# system to the architecture of the nix-* binaries used. So if on an
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# amd64 system the user has an i686 Nix package in her PATH, then we
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# would silently downgrade the whole system to be i686 NixOS on the
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# next reboot.
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if [ -z "$_NIXOS_REBUILD_REEXEC" ]; then
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export PATH=@nix@/bin:$PATH
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fi
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# Use /etc/nixos/flake.nix if it exists. It can be a symlink to the
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# actual flake.
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if [[ -z $flake && -e /etc/nixos/flake.nix && -z $noFlake ]]; then
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flake="$(dirname "$(readlink -f /etc/nixos/flake.nix)")"
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fi
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# Re-execute nixos-rebuild from the Nixpkgs tree.
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# FIXME: get nixos-rebuild from $flake.
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if [[ -z $_NIXOS_REBUILD_REEXEC && -n $canRun && -z $fast && -z $flake ]]; then
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if p=$(runCmd nix-build --no-out-link --expr 'with import <nixpkgs/nixos> {}; config.system.build.nixos-rebuild' "${extraBuildFlags[@]}"); then
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export _NIXOS_REBUILD_REEXEC=1
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runCmd exec "$p/bin/nixos-rebuild" "${origArgs[@]}"
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exit 1
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fi
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fi
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# For convenience, use the hostname as the default configuration to
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# build from the flake.
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if [[ -n $flake ]]; then
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if [[ $flake =~ ^(.*)\#([^\#\"]*)$ ]]; then
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flake="${BASH_REMATCH[1]}"
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flakeAttr="${BASH_REMATCH[2]}"
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fi
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if [[ -z $flakeAttr ]]; then
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read -r hostname < /proc/sys/kernel/hostname
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if [[ -z $hostname ]]; then
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hostname=default
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fi
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flakeAttr="nixosConfigurations.\"$hostname\""
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else
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flakeAttr="nixosConfigurations.\"$flakeAttr\""
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fi
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fi
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# Find configuration.nix and open editor instead of building.
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if [ "$action" = edit ]; then
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if [[ -z $flake ]]; then
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NIXOS_CONFIG=${NIXOS_CONFIG:-$(runCmd nix-instantiate --find-file nixos-config)}
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if [[ -d $NIXOS_CONFIG ]]; then
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NIXOS_CONFIG=$NIXOS_CONFIG/default.nix
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fi
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runCmd exec ${EDITOR:-nano} "$NIXOS_CONFIG"
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else
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runCmd exec nix "${flakeFlags[@]}" edit "${lockFlags[@]}" -- "$flake#$flakeAttr"
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fi
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exit 1
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fi
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tmpDir=$(mktemp -t -d nixos-rebuild.XXXXXX)
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SSHOPTS="$NIX_SSHOPTS -o ControlMaster=auto -o ControlPath=$tmpDir/ssh-%n -o ControlPersist=60"
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cleanup() {
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for ctrl in "$tmpDir"/ssh-*; do
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ssh -o ControlPath="$ctrl" -O exit dummyhost 2>/dev/null || true
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done
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rm -rf "$tmpDir"
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}
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trap cleanup EXIT
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# First build Nix, since NixOS may require a newer version than the
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# current one.
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if [[ -n "$rollback" || "$action" = dry-build ]]; then
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buildNix=
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fi
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nixSystem() {
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machine="$(uname -m)"
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if [[ "$machine" =~ i.86 ]]; then
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machine=i686
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fi
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echo $machine-linux
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}
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prebuiltNix() {
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machine="$1"
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if [ "$machine" = x86_64 ]; then
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echo @nix_x86_64_linux@
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elif [[ "$machine" =~ i.86 ]]; then
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echo @nix_i686_linux@
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elif [[ "$machine" = aarch64 ]]; then
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echo @nix_aarch64_linux@
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else
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echo "$0: unsupported platform"
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exit 1
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fi
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}
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if [[ -n $buildNix && -z $flake ]]; then
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echo "building Nix..." >&2
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nixDrv=
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if ! nixDrv="$(runCmd nix-instantiate '<nixpkgs/nixos>' --add-root "$tmpDir/nix.drv" --indirect -A config.nix.package.out "${extraBuildFlags[@]}")"; then
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if ! nixDrv="$(runCmd nix-instantiate '<nixpkgs>' --add-root "$tmpDir/nix.drv" --indirect -A nix "${extraBuildFlags[@]}")"; then
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if ! nixStorePath="$(runCmd nix-instantiate --eval '<nixpkgs/nixos/modules/installer/tools/nix-fallback-paths.nix>' -A "$(nixSystem)" | sed -e 's/^"//' -e 's/"$//')"; then
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nixStorePath="$(prebuiltNix "$(uname -m)")"
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||
fi
|
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if ! runCmd nix-store -r "$nixStorePath" --add-root "${tmpDir}/nix" --indirect \
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--option extra-binary-caches https://cache.nixos.org/; then
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echo "warning: don't know how to get latest Nix" >&2
|
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fi
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# Older version of nix-store -r don't support --add-root.
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[ -e "$tmpDir/nix" ] || ln -sf "$nixStorePath" "$tmpDir/nix"
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if [ -n "$buildHost" ]; then
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remoteNixStorePath="$(runCmd prebuiltNix "$(buildHostCmd uname -m)")"
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remoteNix="$remoteNixStorePath/bin"
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if ! buildHostCmd nix-store -r "$remoteNixStorePath" \
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--option extra-binary-caches https://cache.nixos.org/ >/dev/null; then
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remoteNix=
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echo "warning: don't know how to get latest Nix" >&2
|
||
fi
|
||
fi
|
||
fi
|
||
fi
|
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if [ -a "$nixDrv" ]; then
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nix-store -r "$nixDrv"'!'"out" --add-root "$tmpDir/nix" --indirect >/dev/null
|
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if [ -n "$buildHost" ]; then
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nix-copy-closure "${copyClosureFlags[@]}" --to "$buildHost" "$nixDrv"
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# The nix build produces multiple outputs, we add them all to the remote path
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for p in $(buildHostCmd nix-store -r "$(readlink "$nixDrv")" "${buildArgs[@]}"); do
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remoteNix="$remoteNix${remoteNix:+:}$p/bin"
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done
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fi
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fi
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PATH="$tmpDir/nix/bin:$PATH"
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fi
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|
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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 [[ -n $canRun && -z $flake ]]; then
|
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if nixpkgs=$(runCmd nix-instantiate --find-file nixpkgs "${extraBuildFlags[@]}"); then
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suffix=$(runCmd $SHELL "$nixpkgs/nixos/modules/installer/tools/get-version-suffix" "${extraBuildFlags[@]}" || true)
|
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if [ -n "$suffix" ]; then
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echo -n "$suffix" > "$nixpkgs/.version-suffix" || true
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fi
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fi
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fi
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|
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if [ "$action" = dry-build ]; then
|
||
extraBuildFlags+=(--dry-run)
|
||
fi
|
||
|
||
|
||
# Either upgrade the configuration in the system profile (for "switch"
|
||
# or "boot"), or just build it and create a symlink "result" in the
|
||
# current directory (for "build" and "test").
|
||
if [ -z "$rollback" ]; then
|
||
echo "building the system configuration..." >&2
|
||
if [[ "$action" = switch || "$action" = boot ]]; then
|
||
if [[ -z $flake ]]; then
|
||
pathToConfig="$(nixBuild '<nixpkgs/nixos>' --no-out-link -A system "${extraBuildFlags[@]}")"
|
||
else
|
||
pathToConfig="$(nixFlakeBuild "$flake#$flakeAttr.config.system.build.toplevel" "${extraBuildFlags[@]}" "${lockFlags[@]}")"
|
||
fi
|
||
copyToTarget "$pathToConfig"
|
||
targetHostCmd nix-env -p "$profile" --set "$pathToConfig"
|
||
elif [[ "$action" = test || "$action" = build || "$action" = dry-build || "$action" = dry-activate ]]; then
|
||
if [[ -z $flake ]]; then
|
||
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A system -k "${extraBuildFlags[@]}")"
|
||
else
|
||
pathToConfig="$(nixFlakeBuild "$flake#$flakeAttr.config.system.build.toplevel" "${extraBuildFlags[@]}" "${lockFlags[@]}")"
|
||
fi
|
||
elif [ "$action" = build-vm ]; then
|
||
if [[ -z $flake ]]; then
|
||
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vm -k "${extraBuildFlags[@]}")"
|
||
else
|
||
pathToConfig="$(nixFlakeBuild "$flake#$flakeAttr.config.system.build.vm" "${extraBuildFlags[@]}" "${lockFlags[@]}")"
|
||
fi
|
||
elif [ "$action" = build-vm-with-bootloader ]; then
|
||
if [[ -z $flake ]]; then
|
||
pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vmWithBootLoader -k "${extraBuildFlags[@]}")"
|
||
else
|
||
pathToConfig="$(nixFlakeBuild "$flake#$flakeAttr.config.system.build.vmWithBootLoader" "${extraBuildFlags[@]}" "${lockFlags[@]}")"
|
||
fi
|
||
else
|
||
showSyntax
|
||
fi
|
||
# Copy build to target host if we haven't already done it
|
||
if ! [[ "$action" = switch || "$action" = boot ]]; then
|
||
copyToTarget "$pathToConfig"
|
||
fi
|
||
else # [ -n "$rollback" ]
|
||
if [[ "$action" = switch || "$action" = boot ]]; then
|
||
targetHostCmd nix-env --rollback -p "$profile"
|
||
pathToConfig="$profile"
|
||
elif [[ "$action" = test || "$action" = build ]]; then
|
||
systemNumber=$(
|
||
targetHostCmd nix-env -p "$profile" --list-generations |
|
||
sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
|
||
)
|
||
pathToConfig="$profile"-${systemNumber}-link
|
||
if [ -z "$targetHost" ]; then
|
||
ln -sT "$pathToConfig" ./result
|
||
fi
|
||
else
|
||
showSyntax
|
||
fi
|
||
fi
|
||
|
||
|
||
# If we're not just building, then make the new configuration the boot
|
||
# default and/or activate it now.
|
||
if [[ "$action" = switch || "$action" = boot || "$action" = test || "$action" = dry-activate ]]; then
|
||
if ! targetHostCmd "$pathToConfig/bin/switch-to-configuration" "$action"; then
|
||
echo "warning: error(s) occurred while switching to the new configuration" >&2
|
||
exit 1
|
||
fi
|
||
fi
|
||
|
||
|
||
if [[ "$action" = build-vm || "$action" = build-vm-with-bootloader ]]; then
|
||
cat >&2 <<EOF
|
||
|
||
Done. The virtual machine can be started by running $(echo "${pathToConfig}/bin/"run-*-vm)
|
||
EOF
|
||
fi
|