ensure that artifacts are installed in e.g. instantiate for projects that are not packages (#3075)

fixes #2979

Author: KristofferC

src/Operations.jl

@@ -116,6 +116,9 @@ function is_instantiated(env::EnvCache; platform = HostPlatform())::Bool
         if idx === nothing
             push!(pkgs, Types.PackageSpec(name=env.pkg.name, uuid=env.pkg.uuid, version=env.pkg.version, path=dirname(env.project_file)))
         end
+    else
+        # Make sure artifacts for project exist even if it is not a package
+        check_artifacts_downloaded(dirname(env.project_file); platform) || return false
     end
     # Make sure all paths/artifacts exist
     return all(pkg -> is_package_downloaded(env.project_file, pkg; platform), pkgs)
@@ -648,8 +651,7 @@ function download_artifacts(env::EnvCache;
         pkg_root = source_path(env.project_file, pkg, julia_version)
         pkg_root === nothing || push!(pkg_roots, pkg_root)
     end
-    envpkg = env.pkg
-    envpkg === nothing || push!(pkg_roots, envpkg.path)
+    push!(pkg_roots, dirname(env.project_file))
     for pkg_root in pkg_roots
         for (artifacts_toml, artifacts) in collect_artifacts(pkg_root; platform)
             # For each Artifacts.toml, install each artifact we've collected from it

test/artifacts.jl

@@ -488,7 +488,7 @@ end
             "AugmentedPlatform",
             "flooblecrank" => "disengaged",
         )
-    
+
         p = HostPlatform()
         p["flooblecrank"] = "engaged"
         add_this_pkg(; platform=p)
@@ -770,4 +770,16 @@ end
     end
 end
 
+@testset "artifacts for non package project" begin
+    temp_pkg_dir() do tmpdir
+        artifacts_toml = joinpath(tmpdir, "Artifacts.toml")
+        cp(joinpath(@__DIR__, "test_packages", "ArtifactInstallation", "Artifacts.toml"), artifacts_toml)
+        Pkg.activate(tmpdir)
+        cts_hash = artifact_hash("collapse_the_symlink", artifacts_toml)
+        @test !artifact_exists(cts_hash)
+        Pkg.instantiate()
+        @test artifact_exists(cts_hash)
+    end
+end
+
 end # module