Merge branch 'master' into staging

Resolved the following conflicts (by carefully applying patches from the both
branches since the fork point):

   pkgs/development/libraries/epoxy/default.nix
   pkgs/development/libraries/gtk+/3.x.nix
   pkgs/development/python-modules/asgiref/default.nix
   pkgs/development/python-modules/daphne/default.nix
   pkgs/os-specific/linux/systemd/default.nix

nixos/modules/virtualisation/parallels-guest.nix

@@ -3,9 +3,7 @@
 with lib;
 
 let
-
-  prl-tools = config.boot.kernelPackages.prl-tools;
-
+  prl-tools = config.hardware.parallels.package;
 in
 
 {
@@ -22,6 +20,26 @@ in
         '';
       };
 
+      autoMountShares = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''
+          Control prlfsmountd service. When this service is running, shares can not be manually
+          mounted through `mount -t prl_fs ...` as this service will remount and trample any set options.
+          Recommended to enable for simple file sharing, but extended share use such as for code should
+          disable this to manually mount shares.
+        '';
+      };
+
+      package = mkOption {
+        type = types.package;
+        default = config.boot.kernelPackages.prl-tools;
+        defaultText = "config.boot.kernelPackages.prl-tools";
+        example = literalExample "config.boot.kernelPackages.prl-tools";
+        description = ''
+          Defines which package to use for prl-tools. Override to change the version.
+        '';
+      };
     };
 
   };
@@ -67,7 +85,7 @@ in
       };
     };
 
-    systemd.services.prlfsmountd = {
+    systemd.services.prlfsmountd = mkIf config.hardware.parallels.autoMountShares {
       description = "Parallels Shared Folders Daemon";
       wantedBy = [ "multi-user.target" ];
       serviceConfig = rec {

nixos/modules/virtualisation/xen-dom0.nix

@@ -241,6 +241,12 @@ in
           '';
           target = "default/xendomains";
         }
+      ]
+      ++ lib.optionals (builtins.compareVersions cfg.package.version "4.10" >= 0) [
+        # in V 4.10 oxenstored requires /etc/xen/oxenstored.conf to start
+        { source = "${cfg.package}/etc/xen/oxenstored.conf";
+          target = "xen/oxenstored.conf";
+        }
       ];
 
     # Xen provides udev rules.
@@ -262,7 +268,7 @@ in
         mkdir -p /var/lib/xen # so we create them here unconditionally.
         grep -q control_d /proc/xen/capabilities
         '';
-      serviceConfig = if cfg.package.version < "4.8" then
+      serviceConfig = if (builtins.compareVersions cfg.package.version "4.8" < 0) then
         { ExecStart = ''
             ${cfg.stored}${optionalString cfg.trace " -T /var/log/xen/xenstored-trace.log"} --no-fork
             '';
@@ -275,7 +281,7 @@ in
           NotifyAccess    = "all";
         };
       postStart = ''
-        ${optionalString (cfg.package.version < "4.8") ''
+        ${optionalString (builtins.compareVersions cfg.package.version "4.8" < 0) ''
           time=0
           timeout=30
           # Wait for xenstored to actually come up, timing out after 30 seconds
@@ -320,7 +326,7 @@ in
       serviceConfig = {
         ExecStart = ''
           ${cfg.package}/bin/xenconsoled\
-            ${optionalString ((cfg.package.version >= "4.8")) " -i"}\
+            ${optionalString ((builtins.compareVersions cfg.package.version "4.8" >= 0)) " -i"}\
             ${optionalString cfg.trace " --log=all --log-dir=/var/log/xen"}
           '';
       };