forked from mirrors/nixpkgs
00372ca638
Previously, if the currently installed Nix is too old to evaluate Nixpkgs, then nixos-rebuild would fail and the user had to upgrade Nix manually. Now, as a fallback, we run ‘nix-store -r’ to obtain a binary Nix directly from the binary cache.
226 lines
7 KiB
Bash
226 lines
7 KiB
Bash
#! @shell@
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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=("$@")
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extraBuildFlags=()
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action=
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buildNix=1
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rollback=
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upgrade=
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repair=
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profile=/nix/var/nix/profiles/system
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while [ "$#" -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="$i"
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;;
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--install-grub)
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export NIXOS_INSTALL_GRUB=1
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;;
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--no-build-nix)
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buildNix=
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;;
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--rollback)
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rollback=1
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;;
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--upgrade)
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upgrade=1
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;;
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--repair)
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repair=1
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extraBuildFlags+=("$i")
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;;
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--show-trace|--no-build-hook|--keep-failed|-K|--keep-going|-k|--verbose|-v|-vv|-vvv|-vvvv|-vvvvv|--fallback|--repair|--no-build-output|-Q)
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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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--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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*)
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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 "$action" ]; then showSyntax; fi
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# Only run shell scripts from the Nixpkgs tree if the action is
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# "switch", "boot", or "test". With other actions (such as "build"),
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# the user may reasonably expect that no code from the Nixpkgs tree is
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# executed, so it's safe to run nixos-rebuild against a potentially
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# untrusted tree.
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canRun=
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if [ "$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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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" ]; then
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if p=$(nix-instantiate --find-file nixpkgs/nixos/modules/installer/tools/nixos-rebuild.sh "${extraBuildFlags[@]}"); then
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export _NIXOS_REBUILD_REEXEC=1
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exec $SHELL -e $p "${origArgs[@]}"
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exit 1
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fi
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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 --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-run ]; then
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buildNix=
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fi
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if [ -n "$buildNix" ]; then
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echo "building Nix..." >&2
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if ! nix-build '<nixpkgs/nixos>' -A config.nix.package -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
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if ! nix-build '<nixpkgs/nixos>' -A nixFallback -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
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if ! nix-build '<nixpkgs>' -A nix -o $tmpDir/nix "${extraBuildFlags[@]}" > /dev/null; then
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machine="$(uname -m)"
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if [ "$machine" = x86_64 ]; then
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nixStorePath=/nix/store/d34q3q2zj9nriq4ifhn3dnnngqvinjb3-nix-1.7
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elif [[ "$machine" =~ i.86 ]]; then
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nixStorePath=/nix/store/qlah0darpcn6sf3lr2226rl04l1gn4xz-nix-1.7
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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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if ! nix-store -r $nixStorePath --add-root $tmpDir/nix --indirect \
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--option extra-binary-caches http://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 $tmpDir/nix
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fi
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fi
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fi
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PATH=$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-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 "$profile" -f '<nixpkgs/nixos>' --set -A system
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pathToConfig="$profile"
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elif [ "$action" = test -o "$action" = build -o "$action" = dry-run ]; then
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nix-build '<nixpkgs/nixos>' -A system -K -k "${extraBuildFlags[@]}" > /dev/null
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pathToConfig=./result
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elif [ "$action" = build-vm ]; then
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nix-build '<nixpkgs/nixos>' -A vm -K -k "${extraBuildFlags[@]}" > /dev/null
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pathToConfig=./result
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elif [ "$action" = build-vm-with-bootloader ]; then
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nix-build '<nixpkgs/nixos>' -A vmWithBootLoader -K -k "${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 "$action" = boot ]; then
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nix-env --rollback -p "$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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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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ln -sT "$profile"-${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 "$action" = test ]; then
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$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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