mount encrypted partition with sops key

machines/AMD-Workstation/default.nix

@@ -51,10 +51,16 @@
   # Mount
   # TODO: fix sops
   sops.secrets.files-veracrypt.sopsFile = inputs.self.secretsDir + /amd-workstation/misc.yaml;
-  environment.etc.crypttab = {
+  services.cryptmount.files-veracrypt = {
-    text = ''
+    what = "/dev/disk/by-partuuid/15fa11a1-a6d8-4962-9c03-74b209d7c46a";
-      files-veracrypt /dev/disk/by-partuuid/15fa11a1-a6d8-4962-9c03-74b209d7c46a /var/secrets/files-veracrypt tcrypt-veracrypt
+    where = "/media/files";
-    '';
+    fsType = "ntfs";
+    cryptType = "tcrypt";
+    passwordFile = config.sops.secrets.files-veracrypt.path;
+    mountOptions = [
+      "uid=${toString config.users.users.${config.mainuser}.uid}"
+      "gid=${toString config.users.groups.users.gid}"
+    ];
   };
   fileSystems = {
     "/media/win-sys" = {
@@ -66,15 +72,6 @@
         "gid=${toString config.users.groups.users.gid}"
       ];
     };
-    "/media/files" = {
-      fsType = "ntfs";
-      device = "/dev/mapper/files-veracrypt";
-      options = [
-        "nofail"
-        "uid=${toString config.users.users.${config.mainuser}.uid}"
-        "gid=${toString config.users.groups.users.gid}"
-      ];
-    };
   };
 
   powerManagement.cpuFreqGovernor = "schedutil";

modules/crypt-mount.nix

@@ -0,0 +1,81 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib;
+{
+  options.services.cryptmount = mkOption {
+    type = types.attrsOf (
+      types.submodule (
+        { name, ... }:
+        {
+          options = {
+            cryptname = mkOption {
+              type = types.str;
+              default = name;
+            };
+            passwordFile = mkOption { type = types.str; };
+            what = mkOption { type = types.str; };
+            where = mkOption { type = types.str; };
+            fsType = mkOption {
+              type = with types; nullOr str;
+              default = null;
+            };
+            cryptType = mkOption {
+              type = types.enum [
+                "luks"
+                "luks1"
+                "luks2"
+                "plain"
+                "loopaes"
+                "tcrypt"
+                "bitlk"
+              ];
+              default = "luks";
+            };
+            mountOptions = mkOption {
+              type = with types; listOf str;
+              default = [ ];
+            };
+          };
+        }
+      )
+    );
+    default = { };
+  };
+  config = mkIf (config.services.cryptmount != { }) {
+    systemd.services =
+      mapAttrs'
+        (
+          name: cfg:
+          nameValuePair "cryptmount-${name}" ({
+            wantedBy = [ "multi-user.target" ];
+            path = [ pkgs.cryptsetup ];
+            serviceConfig =
+              let
+                mount-type = if (cfg.fsType != null) then "-t ${cfg.fsType}" else "";
+                opts =
+                  if (cfg.mountOptions != [ ]) then "-o ${strings.concatStringsSep "," cfg.mountOptions}" else "";
+              in
+              {
+                Type = "oneshot";
+                TimeoutStartSec = "infinity";
+                RemainAfterExit = true;
+                ExecStart = pkgs.writeShellScript "storage-decrypt-${name}" ''
+                  set -euo pipefail
+                  mkdir -p ${cfg.where}
+                  cat ${cfg.passwordFile} | cryptsetup open ${cfg.what} ${cfg.cryptname} - --type ${cfg.cryptType}
+                  /run/wrappers/bin/mount ${mount-type} ${opts} /dev/mapper/${cfg.cryptname} ${cfg.where}
+                '';
+                ExecStop = pkgs.writeShellScript "storage-decrypt-stop-${name}" ''
+                  /run/wrappers/bin/umount -R ${cfg.where}
+                  cryptsetup close ${cfg.cryptname}
+                '';
+              };
+          })
+        )
+        config.services.cryptmount;
+  };
+}