psi-plus: 1.5.1549 -> 1.5.1556-2

pkgs/applications/networking/instant-messengers/psi-plus/default.nix

@@ -40,15 +40,43 @@ assert builtins.elem (lib.toLower chatType) [
 
 assert enablePsiMedia -> enablePlugins;
 
-mkDerivation rec {
+mkDerivation {
   pname = "psi-plus";
-  version = "1.5.1549";
+
+  # Version mask is “X.X.XXXX-R” where “X.X.XXXX” is a mandatory version of Psi
+  # and “-R” ending is optional revision number.
+  #
+  # The “psi-plus-snapshots” generally provides snapshots of these separate
+  # repositories glued together (there are also dependencies/libraries):
+  #
+  # 1. Psi
+  # 2. Plugins pack for Psi
+  # 3. “psimedia” plugin
+  # 4. Resources for Psi (icons, skins, sounds)
+  #
+  # “X.X.XXXX” is literally a version of Psi.
+  # So often when for instance plugins are updated separately a new snapshot is
+  # created. And that snapshot would also be linked to “X.X.XXXX” version.
+  # So many commits may have the same associated version of the snapshot.
+  # But mind that only one Git tag is created for “X.X.XXXX” version.
+  #
+  # It’s not yet defined in the Psi+ project what value to use as a version for
+  # any further releases that don’t change Psi version.
+  #
+  # Let’s do what Debian does for instance (appends “-R” where “R” is a revision
+  # number).
+  # E.g. https://tracker.debian.org/news/1226321/psi-plus-14554-5-migrated-to-testing/
+  #
+  # This has been communicated with the Psi+ main devs in this XMPP MUC chat:
+  # psi-dev@conference.jabber.ru
+  #
+  version = "1.5.1556-2";
 
   src = fetchFromGitHub {
     owner = "psi-plus";
     repo = "psi-plus-snapshots";
-    rev = version;
-    sha256 = "0jpv6qzfg6xjwkrnci7fav27nxm174i9l5g4vmsbchqpwfk90z2m";
+    rev = "635879010b6697f7041a7bbea1853a1f4673c7f7";
+    sha256 = "18xvljcm0a9swkyz4diwxi4xaj0w27jnhfgpi8fv5fj11j0g1b3a";
   };
 
   cmakeFlags = [
@@ -96,7 +124,7 @@ mkDerivation rec {
 
   meta = with lib; {
     homepage = "https://psi-plus.com";
-    description = "XMPP (Jabber) client";
+    description = "XMPP (Jabber) client based on Qt5";
     maintainers = with maintainers; [ orivej misuzu unclechu ];
     license = licenses.gpl2Only;
     platforms = platforms.linux;