add davfs module

README.md

@@ -51,6 +51,7 @@ services. Also, the design will be extendable to allow users to add services not
 - [X] Database Postgres
   - [ ] Slow log monitoring.
   - [ ] Export metrics to Prometheus.
+- [X] Mount webdav folders
 
 ## Repo layout
 

flake.nix

@@ -13,6 +13,7 @@
         modules/authelia.nix
         modules/backup.nix
         modules/deluge.nix
+        modules/davfs.nix
         modules/hledger.nix
         modules/home-assistant.nix
         modules/jellyfin.nix

modules/davfs.nix

@@ -0,0 +1,108 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.shb.davfs;
+
+  template = file: newPath: replacements:
+    let
+      templatePath = newPath + ".template";
+
+      sedPatterns = lib.strings.concatStringsSep " " (lib.attrsets.mapAttrsToList (from: to: "\"s|${from}|${to}|\"") replacements);
+    in
+      ''
+      ln -fs ${file} ${templatePath}
+      rm ${newPath} || :
+      sed ${sedPatterns} ${templatePath} > ${newPath}
+      '';
+in
+{
+  options.shb.davfs = {
+    mounts = lib.mkOption {
+      type = lib.types.listOf (lib.types.submodule {
+        options = {
+          remoteUrl = lib.mkOption {
+            type = lib.types.str;
+            description = "Webdav endpoint to connect to.";
+            example = "https://my.domain.com/dav";
+          };
+
+          mountPoint = lib.mkOption {
+            type = lib.types.str;
+            description = "Mount point to mount the webdav endpoint on.";
+            example = "/mnt";
+          };
+
+          username = lib.mkOption {
+            type = lib.types.str;
+            description = "Username to connect to the webdav endpoint.";
+          };
+
+          passwordFile = lib.mkOption {
+            type = lib.types.str;
+            description = "Password to connect to the webdav endpoint.";
+          };
+
+          uid = lib.mkOption {
+            type = lib.types.nullOr lib.types.int;
+            description = "User owner of the mount point.";
+            example = 1000;
+            default = null;
+          };
+
+          gid = lib.mkOption {
+            type = lib.types.nullOr lib.types.int;
+            description = "Group owner of the mount point.";
+            example = 1000;
+            default = null;
+          };
+
+          fileMode = lib.mkOption {
+            type = lib.types.nullOr lib.types.str;
+            description = "File creation mode";
+            example = "0664";
+            default = null;
+          };
+
+          directoryMode = lib.mkOption {
+            type = lib.types.nullOr lib.types.str;
+            description = "Directory creation mode";
+            example = "2775";
+            default = null;
+          };
+
+          automount = lib.mkOption {
+            type = lib.types.bool;
+            description = "Create a systemd automount unit";
+            default = true;
+          };
+        };
+      });
+    };
+  };
+
+  config = {
+    services.davfs2.enable = builtins.length cfg.mounts > 0;
+
+    systemd.mounts =
+      let
+        mkMountCfg = c: {
+          enable = true;
+          description = "Webdav mount point";
+          after = [ "network-online.target" ];
+          wants = [ "network-online.target" ];
+
+          what = c.remoteUrl;
+          where = c.mountPoint;
+          options = lib.concatStringsSep "," (
+            (lib.optional (!(isNull c.uid)) "uid=${toString c.uid}")
+            ++ (lib.optional (!(isNull c.gid)) "gid=${toString c.uid}")
+            ++ (lib.optional (!(isNull c.fileMode)) "file_mode=${toString c.fileMode}")
+            ++ (lib.optional (!(isNull c.directoryMode)) "dir_mode=${toString c.directoryMode}")
+          );
+          type = "davfs";
+          mountConfig.TimeoutSet = 15;
+        };
+      in
+        lib.debug.traceValSeqN 2 (map mkMountCfg cfg.mounts);
+  };
+}