nixos/stage-1-systemd: Handover between the systemds directly
This commit is contained in:
Janne Heß
parent
adab6ce552
commit
3df2691e6b
4 changed files with 151 additions and 51 deletions
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@ -55,11 +55,15 @@ let
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substituteInPlace $out/dry-activate --subst-var out
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chmod u+x $out/activate $out/dry-activate
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unset activationScript dryActivationScript
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${pkgs.stdenv.shellDryRun} $out/activate
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${pkgs.stdenv.shellDryRun} $out/dry-activate
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cp ${config.system.build.bootStage2} $out/init
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substituteInPlace $out/init --subst-var-by systemConfig $out
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${if config.boot.initrd.systemd.enable then ''
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cp ${config.system.build.bootStage2} $out/prepare-root
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substituteInPlace $out/prepare-root --subst-var-by systemConfig $out
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ln -s "$systemd/lib/systemd/systemd" $out/init
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'' else ''
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cp ${config.system.build.bootStage2} $out/init
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substituteInPlace $out/init --subst-var-by systemConfig $out
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''}
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ln -s ${config.system.build.etc}/etc $out/etc
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ln -s ${config.system.path} $out/sw
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@ -5,28 +5,30 @@ systemConfig=@systemConfig@
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export HOME=/root PATH="@path@"
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# Process the kernel command line.
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for o in $(</proc/cmdline); do
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case $o in
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boot.debugtrace)
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# Show each command.
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set -x
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;;
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esac
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done
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if [ "${IN_NIXOS_SYSTEMD_STAGE1:-}" != true ]; then
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# Process the kernel command line.
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for o in $(</proc/cmdline); do
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case $o in
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boot.debugtrace)
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# Show each command.
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set -x
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;;
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esac
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done
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# Print a greeting.
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echo
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echo -e "\e[1;32m<<< NixOS Stage 2 >>>\e[0m"
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echo
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# Print a greeting.
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echo
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echo -e "\e[1;32m<<< NixOS Stage 2 >>>\e[0m"
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echo
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# Normally, stage 1 mounts the root filesystem read/writable.
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# However, in some environments, stage 2 is executed directly, and the
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# root is read-only. So make it writable here.
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if [ -z "$container" ]; then
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mount -n -o remount,rw none /
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# Normally, stage 1 mounts the root filesystem read/writable.
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# However, in some environments, stage 2 is executed directly, and the
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# root is read-only. So make it writable here.
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if [ -z "$container" ]; then
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mount -n -o remount,rw none /
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fi
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fi
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@ -39,6 +41,12 @@ if [ ! -e /proc/1 ]; then
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local options="$3"
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local fsType="$4"
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# We must not overwrite this mount because it's bind-mounted
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# from stage 1's /run
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if [ "${IN_NIXOS_SYSTEMD_STAGE1:-}" = true ] && [ "${mountPoint}" = /run ]; then
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return
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fi
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install -m 0755 -d "$mountPoint"
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mount -n -t "$fsType" -o "$options" "$device" "$mountPoint"
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}
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@ -46,7 +54,11 @@ if [ ! -e /proc/1 ]; then
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fi
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echo "booting system configuration $systemConfig" > /dev/kmsg
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if [ "${IN_NIXOS_SYSTEMD_STAGE1:-}" = true ]; then
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echo "booting system configuration ${systemConfig}"
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else
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echo "booting system configuration $systemConfig" > /dev/kmsg
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fi
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# Make /nix/store a read-only bind mount to enforce immutability of
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@ -68,24 +80,26 @@ if [ -n "@readOnlyStore@" ]; then
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fi
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# Use /etc/resolv.conf supplied by systemd-nspawn, if applicable.
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if [ -n "@useHostResolvConf@" ] && [ -e /etc/resolv.conf ]; then
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resolvconf -m 1000 -a host </etc/resolv.conf
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fi
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if [ "${IN_NIXOS_SYSTEMD_STAGE1:-}" != true ]; then
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# Use /etc/resolv.conf supplied by systemd-nspawn, if applicable.
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if [ -n "@useHostResolvConf@" ] && [ -e /etc/resolv.conf ]; then
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resolvconf -m 1000 -a host </etc/resolv.conf
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fi
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# Log the script output to /dev/kmsg or /run/log/stage-2-init.log.
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# Only at this point are all the necessary prerequisites ready for these commands.
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exec {logOutFd}>&1 {logErrFd}>&2
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if test -w /dev/kmsg; then
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exec > >(tee -i /proc/self/fd/"$logOutFd" | while read -r line; do
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if test -n "$line"; then
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echo "<7>stage-2-init: $line" > /dev/kmsg
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fi
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done) 2>&1
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else
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mkdir -p /run/log
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exec > >(tee -i /run/log/stage-2-init.log) 2>&1
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# Log the script output to /dev/kmsg or /run/log/stage-2-init.log.
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# Only at this point are all the necessary prerequisites ready for these commands.
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exec {logOutFd}>&1 {logErrFd}>&2
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if test -w /dev/kmsg; then
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exec > >(tee -i /proc/self/fd/"$logOutFd" | while read -r line; do
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if test -n "$line"; then
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echo "<7>stage-2-init: $line" > /dev/kmsg
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fi
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done) 2>&1
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else
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mkdir -p /run/log
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exec > >(tee -i /run/log/stage-2-init.log) 2>&1
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fi
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fi
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@ -116,11 +130,15 @@ ln -sfn "$systemConfig" /run/booted-system
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: >> /etc/machine-id
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# Reset the logging file descriptors.
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exec 1>&$logOutFd 2>&$logErrFd
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exec {logOutFd}>&- {logErrFd}>&-
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# No need to restore the stdout/stderr streams we never redirected and
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# especially no need to start systemd
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if [ "${IN_NIXOS_SYSTEMD_STAGE1:-}" != true ]; then
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# Reset the logging file descriptors.
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exec 1>&$logOutFd 2>&$logErrFd
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exec {logOutFd}>&- {logErrFd}>&-
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# Start systemd in a clean environment.
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echo "starting systemd..."
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exec @systemdExecutable@ "$@"
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# Start systemd in a clean environment.
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echo "starting systemd..."
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exec @systemdExecutable@ "$@"
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fi
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@ -445,6 +445,67 @@ in {
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'')];
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services."systemd-makefs@".unitConfig.IgnoreOnIsolate = true;
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services."systemd-growfs@".unitConfig.IgnoreOnIsolate = true;
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services.initrd-nixos-activation = {
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after = [ "initrd-fs.target" ];
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requiredBy = [ "initrd.target" ];
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unitConfig.AssertPathExists = "/etc/initrd-release";
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serviceConfig.Type = "oneshot";
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description = "NixOS Activation";
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script = /* bash */ ''
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set -uo pipefail
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export PATH="/bin:${cfg.package.util-linux}/bin"
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# Figure out what closure to boot
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closure=
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for o in $(< /proc/cmdline); do
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case $o in
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init=*)
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IFS== read -r -a initParam <<< "$o"
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closure="$(dirname "''${initParam[1]}")"
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;;
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esac
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done
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# Sanity check
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if [ -z "''${closure:-}" ]; then
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echo 'No init= parameter on the kernel command line' >&2
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exit 1
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fi
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# If we are not booting a NixOS closure (e.g. init=/bin/sh),
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# we don't know what root to prepare so we don't do anything
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if ! [ -x "/sysroot$closure/prepare-root" ]; then
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echo "NEW_INIT=''${initParam[1]}" > /etc/switch-root.conf
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echo "$closure does not look like a NixOS installation - not activating"
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exit 0
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fi
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echo 'NEW_INIT=' > /etc/switch-root.conf
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# We need to propagate /run for things like /run/booted-system
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# and /run/current-system.
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mkdir -p /sysroot/run
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mount --bind /run /sysroot/run
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# Initialize the system
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export IN_NIXOS_SYSTEMD_STAGE1=true
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exec chroot /sysroot $closure/prepare-root
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'';
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};
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# This will either call systemctl with the new init as the last parameter (which
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# is the case when not booting a NixOS system) or with an empty string, causing
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# systemd to bypass its verification code that checks whether the next file is a systemd
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# and using its compiled-in value
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services.initrd-switch-root.serviceConfig = {
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EnvironmentFile = "-/etc/switch-root.conf";
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ExecStart = [
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""
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''systemctl --no-block switch-root /sysroot "''${NEW_INIT}"''
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];
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};
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};
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};
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}
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@ -14,14 +14,31 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
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testScript = ''
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import subprocess
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oldAvail = machine.succeed("df --output=avail / | sed 1d")
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machine.shutdown()
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with subtest("handover to stage-2 systemd works"):
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machine.wait_for_unit("multi-user.target")
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machine.succeed("systemd-analyze | grep -q '(initrd)'") # direct handover
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machine.succeed("touch /testfile") # / is writable
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machine.fail("touch /nix/store/testfile") # /nix/store is not writable
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# Special filesystems are mounted by systemd
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machine.succeed("[ -e /run/booted-system ]") # /run
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machine.succeed("[ -e /sys/class ]") # /sys
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machine.succeed("[ -e /dev/null ]") # /dev
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machine.succeed("[ -e /proc/1 ]") # /proc
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# stage-2-init mounted more special filesystems
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machine.succeed("[ -e /dev/shm ]") # /dev/shm
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machine.succeed("[ -e /dev/pts/ptmx ]") # /dev/pts
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machine.succeed("[ -e /run/keys ]") # /run/keys
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subprocess.check_call(["qemu-img", "resize", "vm-state-machine/machine.qcow2", "+1G"])
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machine.start()
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newAvail = machine.succeed("df --output=avail / | sed 1d")
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with subtest("growfs works"):
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oldAvail = machine.succeed("df --output=avail / | sed 1d")
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machine.shutdown()
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assert int(oldAvail) < int(newAvail), "File system did not grow"
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subprocess.check_call(["qemu-img", "resize", "vm-state-machine/machine.qcow2", "+1G"])
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machine.start()
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newAvail = machine.succeed("df --output=avail / | sed 1d")
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assert int(oldAvail) < int(newAvail), "File system did not grow"
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'';
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})
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