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nixos/ssm-agent: conf files written to /etc

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ssm-agent expects files in /etc/amazon/ssm. The pkg substitutes a location in
the nix store for those default files, but if we ever want to adjust this
configuration on NixOS, we'd need the ability to modify that file.

This change to the nixos module writes copies of the default files from the nix
store to /etc/amazon/ssm. Future versions can add config, but right now this
would allow users to at least write out a text value to
environment.etc."amazon/ssm/amazon-ssm-agent.json".text to provide
their own config.
This commit is contained in:
Joe DeVivo 2021-05-08 16:03:38 -07:00 committed by Cole Helbling
parent 27b4fd19ed
commit bf92d0ec37
2 changed files with 15 additions and 7 deletions
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15
nixos/modules/services/misc/ssm-agent.nix
View file

@ -22,8 +22,8 @@ in {
package = mkOption {
type = types.path;
description = "The SSM agent package to use";
default = pkgs.ssm-agent;
defaultText = "pkgs.ssm-agent";
default = pkgs.ssm-agent.override { overrideEtc = false; };
defaultText = "pkgs.ssm-agent.override { overrideEtc = false; }";
};
};
@ -37,8 +37,10 @@ in {
serviceConfig = {
ExecStart = "${cfg.package}/bin/amazon-ssm-agent";
KillMode = "process";
Restart = "on-failure";
RestartSec = "15min";
# We want this restating pretty frequently. It could be our only means
# of accessing the instance.
Restart = "always";
RestartSec = "1min";
};
};
@ -62,5 +64,10 @@ in {
isNormalUser = true;
group = "ssm-user";
};
environment.etc."amazon/ssm/seelog.xml".source = "${cfg.package}/seelog.xml.template";
environment.etc."amazon/ssm/amazon-ssm-agent.json".source = "${cfg.package}/etc/amazon/ssm/amazon-ssm-agent.json.template";
};
}

7
pkgs/applications/networking/cluster/ssm-agent/default.nix
View file

@ -8,6 +8,7 @@
, dmidecode
, util-linux
, bashInteractive
, overrideEtc ? true
}:
let
@ -63,10 +64,10 @@ buildGoPackage rec {
substituteInPlace agent/session/shell/shell_unix.go \
--replace '"script"' '"${util-linux}/bin/script"'
substituteInPlace agent/appconfig/constants_unix.go \
--replace '"/etc/amazon/ssm/"' '"${placeholder "out"}/etc/amazon/ssm/"'
echo "${version}" > VERSION
'' + lib.optionalString overrideEtc ''
substituteInPlace agent/appconfig/constants_unix.go \
--replace '"/etc/amazon/ssm/"' '"${placeholder "out"}/etc/amazon/ssm/"'
'';
preBuild = ''