treewide: update 21.03 to 21.05

The NixOS 21.03 release has been delayed to 21.05. See NixOS/rfcs#80.

There are two instances of 21.03 which have been left as is, since they
are in stateVersion comparisons. This will ensure that existing user
configurations which refer to 21.03 will continue to work.

7 files changed, 23 insertions, 13 deletions

diff --git a/nixos/doc/manual/release-notes/release-notes.xml b/nixos/doc/manual/release-notes/release-notes.xml
index bf18457c2b3..e083d51406c 100644
--- a/nixos/doc/manual/release-notes/release-notes.xml
+++ b/nixos/doc/manual/release-notes/release-notes.xml
@@ -8,7 +8,7 @@
   This section lists the release notes for each stable version of NixOS and
   current unstable revision.
  </para>
- <xi:include href="rl-2103.xml" />
+ <xi:include href="rl-2105.xml" />
  <xi:include href="rl-2009.xml" />
  <xi:include href="rl-2003.xml" />
  <xi:include href="rl-1909.xml" />
diff --git a/nixos/doc/manual/release-notes/rl-2009.xml b/nixos/doc/manual/release-notes/rl-2009.xml
index 0b1d0d509d7..a6cff1a8fae 100644
--- a/nixos/doc/manual/release-notes/rl-2009.xml
+++ b/nixos/doc/manual/release-notes/rl-2009.xml
@@ -6,7 +6,9 @@
  <title>Release 20.09 (“Nightingale”, 2020.10/27)</title>
 
   <para>
-   Support is planned until the end of April 2021, handing over to 21.03.
+   Support is planned until the end of June 2021, handing over to 21.05.
+   (Plans <link xlink:href="https://github.com/NixOS/rfcs/blob/master/rfcs/0080-nixos-release-schedule.md#core-changes">
+   have shifted</link> by two months since release of 20.09.)
   </para>
  <section xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
@@ -1538,7 +1540,7 @@ services.transmission.settings.rpc-bind-address = "0.0.0.0";
    <listitem>
     <para>
      Specifying <link linkend="opt-services.dovecot2.mailboxes">mailboxes</link> in the <package>dovecot2</package> module
-     as a list is deprecated and will break eval in 21.03. Instead, an attribute-set should be specified where the <literal>name</literal>
+     as a list is deprecated and will break eval in 21.05. Instead, an attribute-set should be specified where the <literal>name</literal>
      should be the key of the attribute.
     </para>
     <para>
diff --git a/nixos/doc/manual/release-notes/rl-2103.xml b/nixos/doc/manual/release-notes/rl-2105.xml
index b76d0930290..6dd14d6051e 100644
--- a/nixos/doc/manual/release-notes/rl-2103.xml
+++ b/nixos/doc/manual/release-notes/rl-2105.xml
@@ -2,14 +2,14 @@
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-release-21.03">
- <title>Release 21.03 (“Okapi”, 2021.03/??)</title>
+         xml:id="sec-release-21.05">
+ <title>Release 21.05 (“Okapi”, 2021.05/??)</title>
 
  <section xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-release-21.03-highlights">
+         xml:id="sec-release-21.05-highlights">
   <title>Highlights</title>
 
   <para>
@@ -20,7 +20,7 @@
   <itemizedlist>
    <listitem>
     <para>
-     Support is planned until the end of October 2021, handing over to 21.09.
+     Support is planned until the end of December 2021, handing over to 21.11.
     </para>
    </listitem>
    <listitem>
@@ -46,7 +46,7 @@
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-release-21.03-new-services">
+         xml:id="sec-release-21.05-new-services">
   <title>New Services</title>
 
   <para>
@@ -82,7 +82,7 @@
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-release-21.03-incompatibilities">
+         xml:id="sec-release-21.05-incompatibilities">
   <title>Backward Incompatibilities</title>
 
   <para>
@@ -501,7 +501,7 @@ self: super:
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-release-21.03-notable-changes">
+         xml:id="sec-release-21.05-notable-changes">
   <title>Other Notable Changes</title>
 
   <itemizedlist>
diff --git a/nixos/modules/services/mail/dovecot.nix b/nixos/modules/services/mail/dovecot.nix
index 03e7e40e388..a2298152b02 100644
--- a/nixos/modules/services/mail/dovecot.nix
+++ b/nixos/modules/services/mail/dovecot.nix
@@ -463,7 +463,7 @@ in
     environment.systemPackages = [ dovecotPkg ];
 
     warnings = mkIf (any isList options.services.dovecot2.mailboxes.definitions) [
-      "Declaring `services.dovecot2.mailboxes' as a list is deprecated and will break eval in 21.03! See the release notes for more info for migration."
+      "Declaring `services.dovecot2.mailboxes' as a list is deprecated and will break eval in 21.05! See the release notes for more info for migration."
     ];
 
     assertions = [
diff --git a/nixos/modules/services/networking/kresd.nix b/nixos/modules/services/networking/kresd.nix
index 074830fc352..4131ff8be5d 100644
--- a/nixos/modules/services/networking/kresd.nix
+++ b/nixos/modules/services/networking/kresd.nix
@@ -140,7 +140,7 @@ in {
 
     # Try cleaning up the previously default location of cache file.
     # Note that /var/cache/* should always be safe to remove.
-    # TODO: remove later, probably between 20.09 and 21.03
+    # TODO: remove later, probably between 20.09 and 21.05
     systemd.tmpfiles.rules = [ "R /var/cache/kresd" ];
   };
 }
diff --git a/nixos/modules/services/web-apps/hedgedoc.nix b/nixos/modules/services/web-apps/hedgedoc.nix
index 3f646d7db0c..d940f3d3dae 100644
--- a/nixos/modules/services/web-apps/hedgedoc.nix
+++ b/nixos/modules/services/web-apps/hedgedoc.nix
@@ -5,6 +5,10 @@ with lib;
 let
   cfg = config.services.hedgedoc;
 
+  # 21.03 will not be an official release - it was instead 21.05.  This
+  # versionAtLeast statement remains set to 21.03 for backwards compatibility.
+  # See https://github.com/NixOS/nixpkgs/pull/108899 and
+  # https://github.com/NixOS/rfcs/blob/master/rfcs/0080-nixos-release-schedule.md.
   name = if versionAtLeast config.system.stateVersion "21.03"
     then "hedgedoc"
     else "codimd";
diff --git a/nixos/modules/services/web-apps/nextcloud.nix b/nixos/modules/services/web-apps/nextcloud.nix
index c5c14050b5c..60d40355335 100644
--- a/nixos/modules/services/web-apps/nextcloud.nix
+++ b/nixos/modules/services/web-apps/nextcloud.nix
@@ -368,7 +368,7 @@ in {
         '')
         ++ (optional (versionOlder cfg.package.version "18") (upgradeWarning 17 "20.03"))
         ++ (optional (versionOlder cfg.package.version "19") (upgradeWarning 18 "20.09"))
-        ++ (optional (versionOlder cfg.package.version "20") (upgradeWarning 19 "21.03"));
+        ++ (optional (versionOlder cfg.package.version "20") (upgradeWarning 19 "21.05"));
 
       services.nextcloud.package = with pkgs;
         mkDefault (
@@ -380,6 +380,10 @@ in {
             ''
           else if versionOlder stateVersion "20.03" then nextcloud17
           else if versionOlder stateVersion "20.09" then nextcloud18
+          # 21.03 will not be an official release - it was instead 21.05.
+          # This versionOlder statement remains set to 21.03 for backwards compatibility.
+          # See https://github.com/NixOS/nixpkgs/pull/108899 and
+          # https://github.com/NixOS/rfcs/blob/master/rfcs/0080-nixos-release-schedule.md.
           else if versionOlder stateVersion "21.03" then nextcloud19
           else nextcloud20
         );