krebs.secret: restart units on secret change

1 files changed, 40 insertions, 28 deletions

diff --git a/krebs/3modules/secret.nix b/krebs/3modules/secret.nix
index 672c503b0..bf2c62cc9 100644
--- a/krebs/3modules/secret.nix
+++ b/krebs/3modules/secret.nix
@@ -1,4 +1,5 @@
-{ config, lib, pkgs, ... }@args: with import <stockholm/lib>; let
+with import <stockholm/lib>;
+{ config, lib, pkgs, ... }: let
   cfg = config.krebs.secret;
 in {
   options.krebs.secret = {
@@ -8,32 +9,43 @@ in {
     };
   };
   config = lib.mkIf (cfg.files != {}) {
-    systemd.services.secret = let
-      # TODO fail if two files have the same path but differ otherwise
-      files = unique (map (flip removeAttrs ["_module"])
-                          (attrValues cfg.files));
-    in {
-      serviceConfig = {
-        Type = "oneshot";
-        RemainAfterExit = "yes";
-        SyslogIdentifier = "secret";
-        ExecStart = pkgs.writeDash "install-secret-files" ''
-          exit_code=0
-          ${concatMapStringsSep "\n" (file: ''
-            ${pkgs.coreutils}/bin/install \
-                  -D \
-                  --compare \
-                  --verbose \
-                  --mode=${shell.escape file.mode} \
-                  --owner=${shell.escape file.owner.name} \
-                  --group=${shell.escape file.group-name} \
-                  ${shell.escape file.source-path} \
-                  ${shell.escape file.path} \
-                || exit_code=1
-          '') files}
-          exit $exit_code
-        '';
-      };
-    };
+    systemd.paths =
+      mapAttrs'
+        (name: file: nameValuePair "secret-trigger-${systemd.encodeName name}" {
+          wantedBy = ["multi-user.target"];
+          pathConfig.PathChanged = file.source-path;
+        })
+        cfg.files;
+    systemd.services =
+      mapAttrs'
+        (name: file: nameValuePair "secret-trigger-${systemd.encodeName name}" {
+          wantedBy = ["multi-user.target"];
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStart = "${pkgs.systemd}/bin/systemctl restart ${file.service}";
+          };
+        })
+        cfg.files
+      //
+      mapAttrs'
+        (name: file: nameValuePair "secret-${systemd.encodeName name}" {
+          wantedBy = ["multi-user.target"];
+          serviceConfig = {
+            Type = "oneshot";
+            RemainAfterExit = "yes";
+            ExecStart = toString [
+              "${pkgs.coreutils}/bin/install"
+              "-D"
+              "--compare"
+              "--verbose"
+              "--mode=${file.mode}"
+              "--owner=${file.owner.name}"
+              "--group=${file.group-name}"
+              file.source-path
+              file.path
+            ];
+          };
+        })
+        cfg.files;
   };
 }