[dotnet] only embed the git revision in SourceLink metadata when stamping

dotnet/private/BUILD.bazel

@@ -11,6 +11,12 @@ exports_files(
     visibility = ["//visibility:public"],
 )
 
+config_setting(
+    name = "stamp_enabled",
+    values = {"stamp": "1"},
+    visibility = ["//dotnet:__subpackages__"],
+)
+
 # The NUnit3TestAdapter NuGet package ships its assemblies under build/<tfm>/
 # (intended for MSBuild .targets-based wiring) instead of the standard
 # lib/<tfm>/ layout, so rules_dotnet's paket extractor leaves the

dotnet/private/sourcelink.bzl

@@ -9,6 +9,18 @@ load("@rules_dotnet//dotnet/private/transitions:tfm_transition.bzl", "tfm_transi
 
 def _generate_sourcelink_json(ctx):
     output = ctx.actions.declare_file(ctx.label.name + "_sourcelink.json")
+
+    # Only stamped builds read the workspace status file: its git revision changes
+    # every commit and would otherwise invalidate every assembly and test.
+    if not ctx.attr.stamp:
+        ctx.actions.write(
+            output = output,
+            content = '{{"documents":{{"*":"{repo}/raw/HEAD/*"}}}}\n'.format(
+                repo = ctx.attr.repo_url.rstrip("/"),
+            ),
+        )
+        return output
+
     ctx.actions.run_shell(
         inputs = [ctx.info_file],
         outputs = [output],
@@ -87,12 +99,28 @@ _SOURCELINK_ATTRS["repo_url"] = attr.string(
     doc = "Source repository URL for SourceLink metadata (e.g. https://github.com/owner/repo).",
     default = "https://github.com/SeleniumHQ/selenium",
 )
+_SOURCELINK_ATTRS["stamp"] = attr.bool(
+    doc = "Embed the current git revision in the SourceLink metadata. Defaults to the --stamp flag.",
+    default = False,
+)
 
-csharp_sourcelink_library = rule(
+_csharp_sourcelink_library = rule(
     _csharp_sourcelink_library_impl,
     doc = "Compile a C# DLL with SourceLink metadata embedded in the PDB.",
     attrs = _SOURCELINK_ATTRS,
     executable = False,
     toolchains = ["@rules_dotnet//dotnet:toolchain_type"],
     cfg = tfm_transition,
 )
+
+def csharp_sourcelink_library(name, stamp = None, **kwargs):
+    if stamp == None:
+        stamp = select({
+            "//dotnet/private:stamp_enabled": True,
+            "//conditions:default": False,
+        })
+    _csharp_sourcelink_library(
+        name = name,
+        stamp = stamp,
+        **kwargs
+    )