access-esm1p6: add variant cice and generic-tracers

packages/access-esm1p6/package.py

@@ -25,12 +25,37 @@ class AccessEsm1p6(BundlePackage):
 
     git = "https://github.com/ACCESS-NRI/ACCESS-ESM1.6.git"
 
-    maintainers("dougiesquire")
+    maintainers("dougiesquire", "harshula")
 
     version("latest")
 
-    depends_on("cice4@access-esm1.5", type="run")
-    depends_on("mom5@access-esm1.6 type=ACCESS-ESM", type="run")
+    variant(
+        "cice",
+        default=4,
+        description="Choose the version of the CICE sea-ice model.",
+        values=(4, 5),
+        multi=False,
+    )
+    variant(
+        "generic-tracers",
+        default=True,
+        description="Enable generic tracers.",
+    )
+
+    depends_on("cice4@access-esm1.5", type="run", when="cice=4")
+    depends_on("cice5@access-esm1.6", type="run", when="cice=5")
+    depends_on(
+        "mom5@access-esm1.6 type=ACCESS-ESM",
+        when="+generic-tracers",
+        type="run",
+    )
+    # TODO: Use the access-esm1.6 branch when it has been confirmed that
+    #       MOM5 master supports building with generic tracers disabled.
+    depends_on(
+        "mom5@access-esm1.5 type=ACCESS-CM",
+        when="~generic-tracers",
+        type="run",
+    )
     # um7 is in a private repository
     depends_on("um7@access-esm1.5", type="run")