oci_push to support Windows builds (#565)

Co-authored-by: Bartosz Popiela <bartosz.popiela@bp.com>
Co-authored-by: Alex Eagle <alex@aspect.dev>

oci/private/BUILD.bazel

@@ -103,5 +103,8 @@ bzl_library(
  name = "util",
  srcs = ["util.bzl"],
  visibility = ["//oci:__subpackages__"],
- deps = ["@bazel_skylib//lib:versions"],
+ deps = [
+ "@bazel_skylib//lib:paths",
+ "@bazel_skylib//lib:versions",
+ ],
 )

oci/private/push.bzl

@@ -128,6 +128,7 @@ _attrs = {
  default = "push.sh.tpl",
  allow_single_file = True,
  ),
+ "_windows_constraint": attr.label(default = "@platforms//os:windows"),
 }
 
 def _quote_args(args):
@@ -178,14 +179,15 @@ def _impl(ctx):
  runfiles = runfiles.merge(yq.default.default_runfiles)
  runfiles = runfiles.merge(crane.default.default_runfiles)
 
- return DefaultInfo(executable = executable, runfiles = runfiles)
+ return DefaultInfo(executable = util.maybe_wrap_launcher_for_windows(ctx, executable), runfiles = runfiles)
 
 oci_push_lib = struct(
  implementation = _impl,
  attrs = _attrs,
  toolchains = [
  "@rules_oci//oci:crane_toolchain_type",
  "@aspect_bazel_lib//lib:yq_toolchain_type",
+ "@bazel_tools//tools/sh:toolchain_type",
  ],
 )
 

oci/private/util.bzl

@@ -1,4 +1,6 @@
 """Utilities"""
+
+load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@bazel_skylib//lib:versions.bzl", "versions")
 
 _IMAGE_PLATFORM_VARIANT_DEFAULTS = {
@@ -150,16 +152,18 @@ SETLOCAL ENABLEEXTENSIONS
 SETLOCAL ENABLEDELAYEDEXPANSION
 for %%a in ("{bash_bin}") do set "bash_bin_dir=%%~dpa"
 set PATH=%bash_bin_dir%;%PATH%
+set "parent_dir=%~dp0"
+set "parent_dir=!parent_dir:\=/!"
 set args=%*
 rem Escape \ and * in args before passing it with double quote
 if defined args (
  set args=!args:\=\\\\!
  set args=!args:"=\"!
 )
-"{bash_bin}" -c "{launcher} !args!"
+"{bash_bin}" -c "%parent_dir%{launcher} !args!"
 """.format(
  bash_bin = ctx.toolchains["@bazel_tools//tools/sh:toolchain_type"].path,
- launcher = bash_launcher.path,
+ launcher = paths.relativize(bash_launcher.path, win_launcher.dirname),
  ),
  is_executable = True,
  )