nixos/redmine: Make optional components configurable

Currently, optional components and integrations of Redmine are enforced
to install in NixOS. Thus, add the following options allowing the users
to enable or disable the components. They are disabled by default.
Enabling these options will add their package to the Redmine environment
and will configure their specific setting in the Redmine configuration
file.

  * services.redmine.components.subversion
  * services.redmine.components.mercurial
  * services.redmine.components.git
  * services.redmine.components.cvs
  * services.redmine.components.breezy
  * services.redmine.components.imagemagick

Signed-off-by: Felix Singer <felixsinger@posteo.net>

nixos/modules/services/misc/redmine.nix

@@ -206,6 +206,44 @@ in
           description = "Create the database and database user locally.";
         };
       };
+
+      components = {
+        subversion = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Subversion integration.";
+        };
+
+        mercurial = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Mercurial integration.";
+        };
+
+        git = mkOption {
+          type = types.bool;
+          default = false;
+          description = "git integration.";
+        };
+
+        cvs = mkOption {
+          type = types.bool;
+          default = false;
+          description = "cvs integration.";
+        };
+
+        breezy = mkOption {
+          type = types.bool;
+          default = false;
+          description = "bazaar integration.";
+        };
+
+        imagemagick = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Allows exporting Gant diagrams as PNG.";
+        };
+      };
     };
   };
 
@@ -229,11 +267,11 @@ in
 
     services.redmine.settings = {
       production = {
-        scm_subversion_command = "${pkgs.subversion}/bin/svn";
+        scm_subversion_command = if cfg.components.subversion then "${pkgs.subversion}/bin/svn" else "";
-        scm_mercurial_command = "${pkgs.mercurial}/bin/hg";
+        scm_mercurial_command = if cfg.components.mercurial then "${pkgs.mercurial}/bin/hg" else "";
-        scm_git_command = "${pkgs.git}/bin/git";
+        scm_git_command = if cfg.components.git then "${pkgs.git}/bin/git" else "";
-        scm_cvs_command = "${pkgs.cvs}/bin/cvs";
+        scm_cvs_command = if cfg.components.cvs then "${pkgs.cvs}/bin/cvs" else "";
-        scm_bazaar_command = "${pkgs.breezy}/bin/bzr";
+        scm_bazaar_command = if cfg.components.breezy then "${pkgs.breezy}/bin/bzr" else "";
       };
     };
 
@@ -295,13 +333,14 @@ in
       environment.REDMINE_LANG = "en";
       environment.SCHEMA = "${cfg.stateDir}/cache/schema.db";
       path = with pkgs; [
-        imagemagick
+      ]
-        breezy
+      ++ optional cfg.components.subversion subversion
-        cvs
+      ++ optional cfg.components.mercurial mercurial
-        git
+      ++ optional cfg.components.git git
-        mercurial
+      ++ optional cfg.components.cvs cvs
-        subversion
+      ++ optional cfg.components.breezy breezy
-      ];
+      ++ optional cfg.components.imagemagick imagemagick;
+
       preStart = ''
         rm -rf "${cfg.stateDir}/plugins/"*
         rm -rf "${cfg.stateDir}/public/themes/"*