Download artifacts when platform tag changes

Author: vchuravy

test/LAMMPS_jll/.pkg/platform_augmentation.jl

@@ -1,5 +1,6 @@
 using Base.BinaryPlatforms
 using Preferences
+import Pkg
 
 function known_abis()
     return (:MicrosoftMPI, :MPICH, :MPItrampoline)
@@ -19,11 +20,23 @@ function set_abi(abi)
     end
     set_preferences!(LAMMPS_UUID, "abi" => string(abi), force=true)
     @warn "The MPI abi has changed, you will need to restart Julia for the change to take effect" abi
+    # Note: We either need to use `LazyArtifacts` or at this point ensure that we download artifacts
+    #       for the new ABI.
+    # Issues: On 1.7 this seems to not work since while we are calling "select_artifacts.jl" we somewhere
+    #         discard the platform we pass to instantiate
+    #         On 1.6 "select_artifacts.jl" does not exist, and thus on first call we might have choosen the
+    #         wrong artifact to begin with an error there.
+    let platform = HostPlatform()
+        platform["mpi"] = string(abi)
+        Pkg.API.instantiate(; platform, verbose=true)
+    end
     return abi
 end
 
 function augment_platform!(platform)
-    BinaryPlatforms.add_tag!(platform.tags, "mpi", string(abi))
+    if !haskey(platform, "mpi")
+        platform["mpi"] = string(abi)
+    end
     return platform
 end