1 files changed, 87 insertions, 0 deletions
diff --git a/python/private/stamp.bzl b/python/private/stamp.bzl
new file mode 100644
index 0000000..6bc0cd9
--- /dev/null
+++ b/python/private/stamp.bzl
@@ -0,0 +1,87 @@
+# Copyright 2023 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""A small utility module dedicated to detecting whether or not the `--stamp` flag is enabled
+
+This module can be removed likely after the following PRs ar addressed:
+- https://github.com/bazelbuild/bazel/issues/11164
+"""
+
+StampSettingInfo = provider(
+    doc = "Information about the `--stamp` command line flag",
+    fields = {
+        "value": "bool: Whether or not the `--stamp` flag was enabled",
+    },
+)
+
+def _stamp_build_setting_impl(ctx):
+    return StampSettingInfo(value = ctx.attr.value)
+
+_stamp_build_setting = rule(
+    doc = """\
+Whether to encode build information into the binary. Possible values:
+
+- stamp = 1: Always stamp the build information into the binary, even in [--nostamp][stamp] builds. \
+This setting should be avoided, since it potentially kills remote caching for the binary and \
+any downstream actions that depend on it.
+- stamp = 0: Always replace build information by constant values. This gives good build result caching.
+- stamp = -1: Embedding of build information is controlled by the [--[no]stamp][stamp] flag.
+
+Stamped binaries are not rebuilt unless their dependencies change.
+[stamp]: https://docs.bazel.build/versions/main/user-manual.html#flag--stamp
+    """,
+    implementation = _stamp_build_setting_impl,
+    attrs = {
+        "value": attr.bool(
+            doc = "The default value of the stamp build flag",
+            mandatory = True,
+        ),
+    },
+)
+
+def stamp_build_setting(name, visibility = ["//visibility:public"]):
+    native.config_setting(
+        name = "stamp_detect",
+        values = {"stamp": "1"},
+        visibility = visibility,
+    )
+
+    _stamp_build_setting(
+        name = name,
+        value = select({
+            ":stamp_detect": True,
+            "//conditions:default": False,
+        }),
+        visibility = visibility,
+    )
+
+def is_stamping_enabled(attr):
+    """Determine whether or not build stamping is enabled
+
+    Args:
+        attr (struct): A rule's struct of attributes (`ctx.attr`)
+
+    Returns:
+        bool: The stamp value
+    """
+    stamp_num = getattr(attr, "stamp", -1)
+    if stamp_num == 1:
+        return True
+    elif stamp_num == 0:
+        return False
+    elif stamp_num == -1:
+        stamp_flag = getattr(attr, "_stamp_flag", None)
+        return stamp_flag[StampSettingInfo].value if stamp_flag else False
+    else:
+        fail("Unexpected `stamp` value: {}".format(stamp_num))