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nixos/switch-to-configuration: Add dry activation scripts

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This commit is contained in:
Janne Heß 2021-09-03 17:18:07 +02:00
parent 5942b67b0c
commit 3156730402
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GPG key ID: 69165158F05265DF
3 changed files with 71 additions and 42 deletions
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100
nixos/modules/system/activation/activation-script.nix
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@ -17,6 +17,41 @@ let
'';
});
systemActivationScript = set: onlyDry: let
set' = filterAttrs (_: v: onlyDry -> v.supportsDryActivation) (mapAttrs (_: v: if isString v then (noDepEntry v) // { supportsDryActivation = false; } else v) set);
withHeadlines = addAttributeName set';
in
''
#!${pkgs.runtimeShell}
systemConfig='@out@'
export PATH=/empty
for i in ${toString path}; do
PATH=$PATH:$i/bin:$i/sbin
done
_status=0
trap "_status=1 _localstatus=\$?" ERR
# Ensure a consistent umask.
umask 0022
${textClosureMap id (withHeadlines) (attrNames withHeadlines)}
'' + optionalString (!onlyDry) ''
# Make this configuration the current configuration.
# The readlink is there to ensure that when $systemConfig = /system
# (which is a symlink to the store), /run/current-system is still
# used as a garbage collection root.
ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
# Prevent the current configuration from being garbage-collected.
ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
exit $_status
'';
path = with pkgs; map getBin
[ coreutils
gnugrep
@ -28,7 +63,7 @@ let
util-linux # needed for mount and mountpoint
];
scriptType = with types;
scriptType = withDry: with types;
let scriptOptions =
{ deps = mkOption
{ type = types.listOf types.str;
@ -39,6 +74,19 @@ let
{ type = types.lines;
description = "The content of the script.";
};
} // optionalAttrs withDry {
supportsDryActivation = mkOption
{ type = types.bool;
default = false;
description = ''
Whether this activation script supports being dry-activated.
These activation scripts will also be executed on dry-activate
activations with the environment variable
<literal>NIXOS_ACTION</literal> being set to <literal>dry-activate
</literal>. it's important that these activation scripts don't
modify anything about the system when the variable is set.
'';
};
};
in either str (submodule { options = scriptOptions; });
@ -74,47 +122,19 @@ in
idempotent and fast.
'';
type = types.attrsOf scriptType;
apply = set: {
script =
''
#! ${pkgs.runtimeShell}
systemConfig=@out@
export PATH=/empty
for i in ${toString path}; do
PATH=$PATH:$i/bin:$i/sbin
done
_status=0
trap "_status=1 _localstatus=\$?" ERR
# Ensure a consistent umask.
umask 0022
${
let
set' = mapAttrs (n: v: if isString v then noDepEntry v else v) set;
withHeadlines = addAttributeName set';
in textClosureMap id (withHeadlines) (attrNames withHeadlines)
}
# Make this configuration the current configuration.
# The readlink is there to ensure that when $systemConfig = /system
# (which is a symlink to the store), /run/current-system is still
# used as a garbage collection root.
ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
# Prevent the current configuration from being garbage-collected.
ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
exit $_status
'';
type = types.attrsOf (scriptType true);
apply = set: set // {
script = systemActivationScript set false;
};
};
system.dryActivationScript = mkOption {
description = "The shell script that is to be run when dry-activating a system.";
readOnly = true;
internal = true;
default = systemActivationScript (removeAttrs config.system.activationScripts [ "script" ]) true;
};
system.userActivationScripts = mkOption {
default = {};
@ -137,7 +157,7 @@ in
idempotent and fast.
'';
type = with types; attrsOf scriptType;
type = with types; attrsOf (scriptType false);
apply = set: {
script = ''