tmpl: add absPeerSnap to nixosCfg until 10.5 release

Author: johnalotoski

templates/cardano-parts-project/flake/colmena.nix

@@ -71,6 +71,9 @@ in
           # Config for cardano-node group deployments
           inputs.cardano-parts.nixosModules.profile-cardano-node-group
           inputs.cardano-parts.nixosModules.profile-cardano-custom-metrics
+
+          # Until 10.5 is released -- see description below
+          absPeerSnap
         ];
       };
 
@@ -184,6 +187,9 @@ in
           inputs.cardano-parts.nixosModules.profile-cardano-postgres
           {services.cardano-node.shareNodeSocket = true;}
           {services.cardano-postgres.enablePsqlrc = true;}
+
+          # Until 10.5 is released -- see description below
+          absPeerSnap
         ];
       };
 
@@ -197,6 +203,17 @@ in
           {services.cardano-faucet.acmeEmail = "[email protected]";}
         ];
       };
+
+      # Until 10.5.x is released, 10.4.1 will fail to start without this because
+      # node doesn't yet properly look up the relative path from topology to
+      # peer snapshot file.
+      #
+      # Setting this option null fixes the problem, but will leave a
+      # dangling peer snapshot file until 10.6.
+      #
+      # So until then, we'll switch from relative path that causes node failure
+      # to absolute path which does not.
+      absPeerSnap = {services.cardano-node.peerSnapshotFile = i: "/etc/cardano-node/peer-snapshot-${toString i}.json";};
     in {
       meta = {
         nixpkgs = import inputs.nixpkgs {