image.name: Default to localhost/$name

docs/modules/ROOT/partials/NixOSOptions.adoc

@@ -233,7 +233,7 @@ Type:: string
 Default::
 +
 ----
-{"_type":"literalExpression","text":"config.service.name"}
+{"_type":"literalExpression","text":"\"localhost/\" + config.service.name"}
 ----
 
 

src/haskell/lib/Arion/Images.hs

@@ -25,7 +25,8 @@ loadImages requestedImages = do
     isNew i =
       -- On docker, the image name is unmodified
       (imageName i <> ":" <> imageTag i) `notElem` loaded
-      -- -- On podman, you automatically get a localhost prefix
+      -- On podman, you used to automatically get a localhost prefix
+      -- however, since NixOS 22.05, this expected to be part of the name instead
         && ("localhost/" <> imageName i <> ":" <> imageTag i) `notElem` loaded
 
   traverse_ loadImage . filter isNew $ requestedImages

src/haskell/testdata/Arion/NixSpec/arion-compose.json

@@ -9,7 +9,7 @@
                 "PATH": "/usr/bin:/run/current-system/sw/bin/",
                 "container": "docker"
             },
-            "image": "webserver:<HASH>",
+            "image": "localhost/webserver:<HASH>",
             "ports": [
                 "8000:80"
             ],
@@ -32,7 +32,7 @@
         "images": [
             {
                 "imageExe": "<STOREPATH>",
-                "imageName": "webserver",
+                "imageName": "localhost/webserver",
                 "imageTag": "<HASH>"
             }
         ],

src/nix/modules/service/image.nix

@@ -104,8 +104,8 @@ in
     };
     image.name = mkOption {
       type = str;
-      default = config.service.name;
-      defaultText = lib.literalExpression or lib.literalExample "config.service.name";
+      default = "localhost/" + config.service.name;
+      defaultText = lib.literalExpression or lib.literalExample ''"localhost/" + config.service.name'';
       description = ''
         A human readable name for the docker image.