nixos/switch-to-configuration: Add dry activation scripts
This commit is contained in:
Janne Heß
parent
5942b67b0c
commit
3156730402
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@ -17,6 +17,41 @@ let
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'';
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});
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systemActivationScript = set: onlyDry: let
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set' = filterAttrs (_: v: onlyDry -> v.supportsDryActivation) (mapAttrs (_: v: if isString v then (noDepEntry v) // { supportsDryActivation = false; } else v) set);
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withHeadlines = addAttributeName set';
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in
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''
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#!${pkgs.runtimeShell}
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systemConfig='@out@'
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export PATH=/empty
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for i in ${toString path}; do
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PATH=$PATH:$i/bin:$i/sbin
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done
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_status=0
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trap "_status=1 _localstatus=\$?" ERR
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# Ensure a consistent umask.
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umask 0022
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${textClosureMap id (withHeadlines) (attrNames withHeadlines)}
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'' + optionalString (!onlyDry) ''
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# Make this configuration the current configuration.
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# The readlink is there to ensure that when $systemConfig = /system
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# (which is a symlink to the store), /run/current-system is still
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# used as a garbage collection root.
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ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
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# Prevent the current configuration from being garbage-collected.
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ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
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exit $_status
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'';
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path = with pkgs; map getBin
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[ coreutils
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gnugrep
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@ -28,7 +63,7 @@ let
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util-linux # needed for mount and mountpoint
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];
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scriptType = with types;
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scriptType = withDry: with types;
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let scriptOptions =
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{ deps = mkOption
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{ type = types.listOf types.str;
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@ -39,6 +74,19 @@ let
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{ type = types.lines;
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description = "The content of the script.";
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};
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} // optionalAttrs withDry {
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supportsDryActivation = mkOption
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{ type = types.bool;
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default = false;
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description = ''
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Whether this activation script supports being dry-activated.
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These activation scripts will also be executed on dry-activate
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activations with the environment variable
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<literal>NIXOS_ACTION</literal> being set to <literal>dry-activate
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</literal>. it's important that these activation scripts don't
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modify anything about the system when the variable is set.
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'';
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};
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};
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in either str (submodule { options = scriptOptions; });
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@ -74,47 +122,19 @@ in
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idempotent and fast.
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'';
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type = types.attrsOf scriptType;
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apply = set: {
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script =
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''
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#! ${pkgs.runtimeShell}
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systemConfig=@out@
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export PATH=/empty
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for i in ${toString path}; do
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PATH=$PATH:$i/bin:$i/sbin
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done
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_status=0
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trap "_status=1 _localstatus=\$?" ERR
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# Ensure a consistent umask.
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umask 0022
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${
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let
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set' = mapAttrs (n: v: if isString v then noDepEntry v else v) set;
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withHeadlines = addAttributeName set';
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in textClosureMap id (withHeadlines) (attrNames withHeadlines)
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}
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# Make this configuration the current configuration.
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# The readlink is there to ensure that when $systemConfig = /system
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# (which is a symlink to the store), /run/current-system is still
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# used as a garbage collection root.
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ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
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# Prevent the current configuration from being garbage-collected.
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ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
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exit $_status
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'';
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type = types.attrsOf (scriptType true);
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apply = set: set // {
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script = systemActivationScript set false;
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};
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};
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system.dryActivationScript = mkOption {
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description = "The shell script that is to be run when dry-activating a system.";
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readOnly = true;
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internal = true;
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default = systemActivationScript (removeAttrs config.system.activationScripts [ "script" ]) true;
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};
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system.userActivationScripts = mkOption {
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default = {};
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@ -137,7 +157,7 @@ in
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idempotent and fast.
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'';
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type = with types; attrsOf scriptType;
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type = with types; attrsOf (scriptType false);
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apply = set: {
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script = ''
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@ -36,6 +36,8 @@ EOF
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exit 1;
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}
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$ENV{NIXOS_ACTION} = $action;
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# This is a NixOS installation if it has /etc/NIXOS or a proper
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# /etc/os-release.
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die "This is not a NixOS installation!\n" unless
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@ -360,6 +362,10 @@ if ($action eq "dry-activate") {
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if scalar @unitsToStopFiltered > 0;
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print STDERR "would NOT stop the following changed units: ", join(", ", sort(keys %unitsToSkip)), "\n"
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if scalar(keys %unitsToSkip) > 0;
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print STDERR "would activate the configuration...\n";
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system("$out/dry-activate", "$out");
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print STDERR "would restart systemd\n" if $restartSystemd;
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print STDERR "would restart the following units: ", join(", ", sort(keys %unitsToRestart)), "\n"
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if scalar(keys %unitsToRestart) > 0;
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@ -56,9 +56,11 @@ let
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''}
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echo "$activationScript" > $out/activate
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echo "$dryActivationScript" > $out/dry-activate
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substituteInPlace $out/activate --subst-var out
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chmod u+x $out/activate
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unset activationScript
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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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cp ${config.system.build.bootStage2} $out/init
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substituteInPlace $out/init --subst-var-by systemConfig $out
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@ -108,6 +110,7 @@ let
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config.system.build.installBootLoader
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or "echo 'Warning: do not know how to make this configuration bootable; please enable a boot loader.' 1>&2; true";
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activationScript = config.system.activationScripts.script;
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dryActivationScript = config.system.dryActivationScript;
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nixosLabel = config.system.nixos.label;
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configurationName = config.boot.loader.grub.configurationName;
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