Add Windows testing

lib/build.ml

@@ -121,6 +121,19 @@ let freebsd ~build =
     ) acc [`X86_64]
   ) [] default_compilers
 
+let windows ~build =
+  let build ~distro ~arch ~compiler =
+    let variant = Variant.v ~arch ~distro ~compiler in
+    let label = Fmt.str "%s-%s" (Variant.docker_tag variant) (Ocaml_version.string_of_arch arch) in
+    build ~opam_version ~lower_bounds:false ~revdeps:false label variant
+  in
+  List.fold_left (fun acc comp ->
+    let comp = Ocaml_version.to_string comp in
+    List.fold_left (fun acc arch ->
+      build ~distro:Variant.windows_server ~arch ~compiler:(comp, None) :: acc
+    ) acc [`X86_64]
+  ) [] default_compilers
+
 (* Non-linux-x86_64 compiler variants. eg ls390x, arm64, flambda, afl etc *)
 let extras ~build =
   let build ~opam_version ~distro ~arch ~compiler label =
@@ -190,6 +203,8 @@ let get_base ~arch variant =
       Current.return (Spec.Macos (Variant.docker_tag variant))
   | `Freebsd ->
       Current.return (Spec.Freebsd (Variant.docker_tag variant))
+  | `Windows ->
+      Current.return (Spec.Windows (Variant.docker_tag variant))
   | `Linux -> (* TODO: Use docker images as base for both MacOS and Linux *)
       let+ repo_id =
         Docker.peek ~schedule:weekly ~arch:(Ocaml_version.to_docker_arch arch)
@@ -271,6 +286,7 @@ let with_cluster ~ocluster ~analysis ~lint ~master source =
     Node.branch ~label:"distributions" (linux_distributions ~arch:`X86_64 ~build);
     Node.branch ~label:"macos" (macos ~build);
     Node.branch ~label:"freebsd" (freebsd ~build);
+    Node.branch ~label:"windows" (windows ~build);
     Node.branch ~label:"extras" (extras ~build);
   ]
 

lib/build.mli

@@ -42,6 +42,16 @@ val freebsd :
     'a) ->
   'a list
 
+val windows :
+  build:
+    (opam_version:[> `Dev ] ->
+    lower_bounds:bool ->
+    revdeps:bool ->
+    string ->
+    Opam_ci_check.Variant.t ->
+    'a) ->
+  'a list
+
 val extras :
   build:
     (opam_version:Opam_ci_check.Opam_version.t ->

lib/cluster_build.ml

@@ -43,9 +43,10 @@ let pool_of_variant v =
     | `Macos -> "macos"
     | `Freebsd -> "freebsd"
     | `Linux -> "linux"
+    | `Windows -> "windows"
   in
   let arch = match Variant.arch v with
-    | `X86_64 | `I386 -> "x86_64"
+    | `X86_64 | `I386 -> if os = "windows" then "amd64" else "x86_64"
     | `Aarch32 | `Aarch64 -> "arm64"
     | `Ppc64le -> "ppc64"
     | `S390x -> "s390x"
@@ -107,7 +108,7 @@ module Op = struct
       | `Riscv64 -> Int64.mul timeout 2L
       | _ -> timeout in
     let os = match Variant.os variant with
-      | `Macos | `Linux | `Freebsd -> `Unix
+      | `Macos | `Linux | `Freebsd | `Windows -> `Unix
     in
     let build_config = {Spec.variant; ty} in
     Current.Job.write job

lib/local_build.ml

@@ -145,12 +145,13 @@ module Op = struct
       { Key.commit; ty; variant } =
     let { docker_context; pool; build_timeout } = config in
     let os = match Variant.os variant with
-      | `Macos | `Linux | `Freebsd -> `Unix
+      | `Macos | `Linux | `Freebsd | `Windows -> `Unix
     in
     let build_config = {Spec.variant; ty}
     in
     let image =
       match base with
+      | Windows _s -> failwith "Local Windows OBuilder worker not supported"
       | Macos _s -> failwith "Local MacOS OBuilder worker not supported"
       | Freebsd _s -> failwith "Local FreeBSD OBuilder worker not supported"
       | Docker image -> image

lib/status_tree.ml

@@ -79,6 +79,7 @@ let status (s, elms1) elms2 =
 let tag_experimental b =
   (* TODO: Remove this *)
   if Astring.String.is_prefix ~affix:"macos-homebrew" b ||
+    Astring.String.is_prefix ~affix:"windows" b ||
     Astring.String.is_prefix ~affix:"freebsd" b
   then b ^ " (experimental)"
   else b

opam-ci-check/lib/opam_build.ml

@@ -5,6 +5,7 @@ let cache ~variant =
   match Variant.os variant with
   | `Freebsd
   | `Linux -> [ Obuilder_spec.Cache.v download_cache ~target:"/home/opam/.opam/download-cache" ]
+  | `Windows -> [ Obuilder_spec.Cache.v download_cache ~target:"c:\\Users\\opam\\AppData\\local\\opam\\download-cache" ]
   | `Macos -> [ Obuilder_spec.Cache.v download_cache ~target:"/Users/mac1000/.opam/download-cache";
                 Obuilder_spec.Cache.v "homebrew" ~target:"/Users/mac1000/Library/Caches/Homebrew" ]
 let network = ["host"]
@@ -84,30 +85,35 @@ let setup_repository ?(local=false) ~variant ~for_docker ~opam_version () =
   let open Obuilder_spec in
   let home_dir = match Variant.os variant with
     | `Macos -> None
+    | `Windows -> Some "/cygdrive/c/Users/opam"
     | `Freebsd
     | `Linux -> Some "/home/opam"
   in
   let prefix = match Variant.os variant with
     | `Macos -> "~/local"
     | `Freebsd -> "/usr/local"
-    | `Linux -> "/usr"
+    | `Windows | `Linux -> "/usr"
   in
   let ln = match Variant.os variant with
-    | `Macos -> "ln"
+    | `Windows | `Macos -> "ln"
     | `Freebsd | `Linux -> "sudo ln"
   in
+  let dst = match Variant.os variant with
+    | `Windows -> "/Users/opam/opam-repository/"
+    | `Macos | `Freebsd | `Linux -> "opam-repository/"
+  in
   let opam_version_str = Opam_version.to_string opam_version
   in
   let opam_repo_args = match Variant.os variant with
     | `Macos -> " -k local" (* TODO: (copy ...) do not copy the content of .git or something like that and make the subsequent opam pin fail *)
-    | `Freebsd | `Linux -> ""
+    | `Windows | `Freebsd | `Linux -> ""
   in
   let opamrc = match Variant.os variant with
     (* NOTE: [for_docker] is required because docker does not support bubblewrap in docker build *)
     (* docker run has --privileged but docker build does not have it *)
     (* so we need to remove the part re-enabling the sandbox. *)
     | `Linux when not for_docker -> " --config .opamrc-sandbox"
-    | `Freebsd | `Macos | `Linux -> ""
+    | `Windows | `Freebsd | `Macos | `Linux -> ""
     (* TODO: On MacOS, the sandbox is always (and should be) enabled by default but does not have those ~/.opamrc-sandbox files *)
   in
   (* If we are testing a minimal opam-repository without
@@ -130,7 +136,7 @@ let setup_repository ?(local=false) ~variant ~for_docker ~opam_version () =
   env "CI" "true" :: env "OPAM_REPO_CI" "true" :: (* Advertise CI for test frameworks *)
   [
     run "rm -rf opam-repository/";
-    copy ["."] ~dst:"opam-repository/";
+    copy ["."] ~dst;
     run "opam repository set-url%s --strict default opam-repository/" opam_repo_args;
     run ~network "opam %s || true" (match opam_version with `V2_1 | `V2_2 | `V2_3 | `Dev -> "update --depexts" | `V2_0 -> "depext -u");
   ] @

opam-ci-check/lib/spec.ml

@@ -3,11 +3,13 @@ type base =
   | Docker of string
   | Macos of string
   | Freebsd of string
+  | Windows of string
 
 let base_to_string = function
   | Docker img -> img
   | Macos base -> base
   | Freebsd base -> base
+  | Windows base -> base
 
 type package = OpamPackage.t
 

opam-ci-check/lib/spec.mli

@@ -7,6 +7,7 @@ type base =
   | Docker of string
   | Macos of string
   | Freebsd of string
+  | Windows of string
 
 val base_to_string : base -> string
 

opam-ci-check/lib/variant.ml

@@ -29,6 +29,7 @@ let pp f t = Fmt.pf f "%s/%s" (docker_tag t) (Ocaml_version.string_of_arch t.arc
 
 let freebsd = "freebsd"
 let macos_homebrew = "macos-homebrew"
+let windows_server = "windows-server-2022-amd64"
 
 let macos_distributions = [
   macos_homebrew;
@@ -41,6 +42,8 @@ let os { distribution; _ } =
     `Macos
   else if List.exists (String.equal distribution) [ "freebsd" ] then
     `Freebsd
+  else if List.exists (String.equal distribution) [ windows_server ] then
+    `Windows
   else
     `Linux
 

opam-ci-check/lib/variant.mli

@@ -13,7 +13,7 @@ val ocaml_version_to_string : t -> string
 val arch : t -> arch
 val docker_tag : t -> string
 val distribution : t -> string
-val os : t -> [ `Linux | `Macos | `Freebsd ]
+val os : t -> [ `Linux | `Macos | `Freebsd | `Windows ]
 
 val pp : t Fmt.t
 
@@ -22,3 +22,6 @@ val macos_homebrew : string
 
 (** The FreeBSD distribution *)
 val freebsd : string
+
+(** The Windows Server distribution *)
+val windows_server : string