nixpkgs-suyu/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh
Silvan Mosberger 204366af6d
Merge pull request #153981 from Enzime/nixos-rebuild-flake-reexec
nixos-rebuild: Reexec when using flakes
2022-03-25 18:16:22 +01:00

579 lines
18 KiB
Bash
Executable file
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

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