404 lines
12 KiB
Bash
404 lines
12 KiB
Bash
#! @shell@
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if [ -x "@shell@" ]; then export SHELL="@shell@"; fi;
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set -e
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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=("$@")
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extraBuildFlags=()
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action=
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buildNix=1
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fast=
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rollback=
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upgrade=
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repair=
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profile=/nix/var/nix/profiles/system
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buildHost=
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targetHost=
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while [ "$#" -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 "$0: --install-grub deprecated, use --install-bootloader instead" >&2
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export NIXOS_INSTALL_BOOTLOADER=1
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;;
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--install-bootloader)
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export NIXOS_INSTALL_BOOTLOADER=1
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;;
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--no-build-nix)
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buildNix=
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;;
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--rollback)
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rollback=1
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;;
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--upgrade)
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upgrade=1
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;;
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--repair)
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repair=1
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extraBuildFlags+=("$i")
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;;
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--max-jobs|-j|--cores|-I|--builders)
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j="$1"; shift 1
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extraBuildFlags+=("$i" "$j")
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;;
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--show-trace|--keep-failed|-K|--keep-going|-k|--verbose|-v|-vv|-vvv|-vvvv|-vvvvv|--fallback|--repair|--no-build-output|-Q|-j*)
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extraBuildFlags+=("$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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extraBuildFlags+=(--show-trace)
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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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*)
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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 "$buildHost" -a -n "$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 [ "$buildHost" = localhost ]; then
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buildHost=
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fi
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buildHostCmd() {
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if [ -z "$buildHost" ]; then
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"$@"
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elif [ -n "$remoteNix" ]; then
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ssh $SSHOPTS "$buildHost" PATH="$remoteNix:$PATH" "$@"
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else
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ssh $SSHOPTS "$buildHost" "$@"
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fi
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}
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targetHostCmd() {
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if [ -z "$targetHost" ]; then
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"$@"
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else
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ssh $SSHOPTS "$targetHost" "$@"
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fi
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}
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copyToTarget() {
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if ! [ "$targetHost" = "$buildHost" ]; then
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if [ -z "$targetHost" ]; then
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NIX_SSHOPTS=$SSHOPTS nix-copy-closure --from "$buildHost" "$1"
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elif [ -z "$buildHost" ]; then
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NIX_SSHOPTS=$SSHOPTS nix-copy-closure --to "$targetHost" "$1"
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else
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buildHostCmd nix-copy-closure --to "$targetHost" "$1"
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fi
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fi
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}
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nixBuild() {
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if [ -z "$buildHost" ]; then
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nix-build "$@"
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else
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local instArgs=()
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local buildArgs=()
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while [ "$#" -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+=("$i")
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;;
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esac
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done
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local drv="$(nix-instantiate "${instArgs[@]}" "${extraBuildFlags[@]}")"
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if [ -a "$drv" ]; then
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NIX_SSHOPTS=$SSHOPTS 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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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 -o "$action" = boot -o "$action" = test ]; then
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canRun=1
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fi
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# If ‘--upgrade’ is given, run ‘nix-channel --update nixos’.
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if [ -n "$upgrade" -a -z "$_NIXOS_REBUILD_REEXEC" ]; then
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nix-channel --update nixos
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# If there are other channels that contain a file called
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# ".update-on-nixos-rebuild", update them as well.
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for channelpath in /nix/var/nix/profiles/per-user/root/channels/*; do
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if [ -e "$channelpath/.update-on-nixos-rebuild" ]; then
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nix-channel --update "$(basename "$channelpath")"
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fi
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done
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fi
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# Make sure that we use the Nix package we depend on, not something
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# else from the PATH for nix-{env,instantiate,build}. This is
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# important, because NixOS defaults the architecture of the rebuilt
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# system to the architecture of the nix-* binaries used. So if on an
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# amd64 system the user has an i686 Nix package in her PATH, then we
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# would silently downgrade the whole system to be i686 NixOS on the
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# next reboot.
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if [ -z "$_NIXOS_REBUILD_REEXEC" ]; then
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export PATH=@nix@/bin:$PATH
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fi
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# Re-execute nixos-rebuild from the Nixpkgs tree.
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if [ -z "$_NIXOS_REBUILD_REEXEC" -a -n "$canRun" -a -z "$fast" ]; then
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if p=$(nix-build --no-out-link --expr 'with import <nixpkgs/nixos> {}; config.system.build.nixos-rebuild' "${extraBuildFlags[@]}"); then
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export _NIXOS_REBUILD_REEXEC=1
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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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# Find configuration.nix and open editor instead of building.
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if [ "$action" = edit ]; then
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NIXOS_CONFIG=${NIXOS_CONFIG:-$(nix-instantiate --find-file nixos-config)}
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exec "${EDITOR:-nano}" "$NIXOS_CONFIG"
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exit 1
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fi
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tmpDir=$(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 "$tmpDir"
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}
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trap cleanup EXIT
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# If the Nix daemon is running, then use it. This allows us to use
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# the latest Nix from Nixpkgs (below) for expression evaluation, while
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# still using the old Nix (via the daemon) for actual store access.
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# This matters if the new Nix in Nixpkgs has a schema change. It
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# would upgrade the schema, which should only happen once we actually
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# switch to the new configuration.
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# If --repair is given, don't try to use the Nix daemon, because the
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# flag can only be used directly.
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if [ -z "$repair" ] && systemctl show nix-daemon.socket nix-daemon.service | grep -q ActiveState=active; then
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export NIX_REMOTE=${NIX_REMOTE-daemon}
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fi
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# First build Nix, since NixOS may require a newer version than the
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# current one.
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if [ -n "$rollback" -o "$action" = dry-build ]; then
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buildNix=
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fi
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nixSystem() {
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machine="$(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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else
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echo "$0: unsupported platform"
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exit 1
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fi
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}
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remotePATH=
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if [ -n "$buildNix" ]; then
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echo "building Nix..." >&2
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nixDrv=
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if ! nixDrv="$(nix-instantiate '<nixpkgs/nixos>' --add-root $tmpDir/nix.drv --indirect -A config.nix.package.out "${extraBuildFlags[@]}")"; then
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if ! nixDrv="$(nix-instantiate '<nixpkgs>' --add-root $tmpDir/nix.drv --indirect -A nix "${extraBuildFlags[@]}")"; then
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if ! nixStorePath="$(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 ! 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="$(prebuiltNix "$(buildHostCmd uname -m)")"
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remoteNix="$remoteNixStorePath/bin"
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if ! buildHostCmd nix-store -r $remoteNixStorePath \
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--option extra-binary-caches https://cache.nixos.org/ >/dev/null; then
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remoteNix=
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echo "warning: don't know how to get latest Nix" >&2
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fi
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fi
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fi
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fi
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if [ -a "$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 --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:$PATH"
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fi
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# Update the version suffix if we're building from Git (so that
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# nixos-version shows something useful).
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if [ -n "$canRun" ]; then
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if nixpkgs=$(nix-instantiate --find-file nixpkgs "${extraBuildFlags[@]}"); then
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suffix=$($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" > "$nixpkgs/.version-suffix" || true
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fi
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fi
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fi
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if [ "$action" = dry-build ]; 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 "$action" = boot ]; then
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pathToConfig="$(nixBuild '<nixpkgs/nixos>' --no-out-link -A system "${extraBuildFlags[@]}")"
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copyToTarget "$pathToConfig"
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targetHostCmd nix-env -p "$profile" --set "$pathToConfig"
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elif [ "$action" = test -o "$action" = build -o "$action" = dry-build -o "$action" = dry-activate ]; then
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pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A system -k "${extraBuildFlags[@]}")"
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elif [ "$action" = build-vm ]; then
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pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vm -k "${extraBuildFlags[@]}")"
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elif [ "$action" = build-vm-with-bootloader ]; then
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pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vmWithBootLoader -k "${extraBuildFlags[@]}")"
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else
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showSyntax
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fi
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# Copy build to target host if we haven't already done it
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if ! [ "$action" = switch -o "$action" = boot ]; then
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copyToTarget "$pathToConfig"
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fi
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else # [ -n "$rollback" ]
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if [ "$action" = switch -o "$action" = boot ]; then
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targetHostCmd nix-env --rollback -p "$profile"
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pathToConfig="$profile"
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elif [ "$action" = test -o "$action" = build ]; then
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systemNumber=$(
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targetHostCmd nix-env -p "$profile" --list-generations |
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sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
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)
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pathToConfig="$profile"-${systemNumber}-link
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if [ -z "$targetHost" ]; then
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ln -sT "$pathToConfig" ./result
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fi
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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 "$action" = test -o "$action" = dry-activate ]; then
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if ! targetHostCmd $pathToConfig/bin/switch-to-configuration "$action"; then
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echo "warning: error(s) occurred while switching to the new configuration" >&2
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exit 1
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fi
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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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