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|
{
lib,
config,
pkgs,
...
}:
let
preSwitchCheckScript = lib.concatLines (
lib.mapAttrsToList (name: text: ''
# pre-switch check ${name}
#
# Run with errexit in a subshell that is not part of an `if`/`||`
# condition, so that `set -e` is actually honoured inside the
# check body.
set +e
(
set -e
${text}
) >&2
_rc=$?
set -e
if [ "$_rc" -ne 0 ]; then
echo "Pre-switch check '${name}' failed" >&2
exit 1
fi
'') config.system.preSwitchChecks
);
in
{
options.system.preSwitchChecksScript = lib.mkOption {
type = lib.types.pathInStore;
internal = true;
readOnly = true;
default = lib.getExe (
pkgs.writeShellApplication {
name = "pre-switch-checks";
text = preSwitchCheckScript;
}
);
};
options.system.preSwitchChecks = lib.mkOption {
default = { };
example = lib.literalExpression ''
{ failsEveryTime =
'''
false
''';
}
'';
description = ''
A set of shell script fragments that are executed before the switch to a
new NixOS system configuration. A failure in any of these fragments will
cause the switch to fail and exit early.
The scripts receive the new configuration path and the action verb passed
to switch-to-configuration, as the first and second positional arguments
(meaning that you can access them using `$1` and `$2`, respectively).
'';
type = lib.types.attrsOf lib.types.str;
};
}
|
