Add crosstool_query

A quick hack of a tool that will be used for removing runtime filegroups

Issue for the --incompatible_disable_runtimes_filegroups incompatible flag
(which this cl is a step towards to): #6942
Tracking issue for legacy crosstool fields removal: #5883

RELNOTES: None.
PiperOrigin-RevId: 225995150

tools/migration/BUILD

@@ -43,3 +43,13 @@ py_test(
         "//third_party/com/github/bazelbuild/bazel/src/main/protobuf:crosstool_config_py_pb2",
     ],
 )
+
+py_binary(
+    name = "crosstool_query",
+    srcs = ["crosstool_query.py"],
+    deps = [
+        "//third_party/com/github/bazelbuild/bazel/src/main/protobuf:crosstool_config_py_pb2",
+        "@io_abseil_py//absl:app",
+        "@io_abseil_py//absl/flags",
+    ],
+)

tools/migration/crosstool_query.py

@@ -0,0 +1,53 @@
+"""Script to make automated CROSSTOOL refactorings easier.
+
+This script reads the CROSSTOOL file and allows for querying of its fields.
+"""
+
+from absl import app
+from absl import flags
+from google.protobuf import text_format
+from third_party.com.github.bazelbuild.bazel.src.main.protobuf import crosstool_config_pb2
+
+flags.DEFINE_string("crosstool", None, "CROSSTOOL file path to be queried")
+flags.DEFINE_string("identifier", None,
+                    "Toolchain identifier to specify toolchain.")
+flags.DEFINE_string("print_field", None, "Field to be printed to stdout.")
+
+
+def main(unused_argv):
+  crosstool = crosstool_config_pb2.CrosstoolRelease()
+
+  crosstool_filename = flags.FLAGS.crosstool
+  identifier = flags.FLAGS.identifier
+  print_field = flags.FLAGS.print_field
+
+  if not crosstool_filename:
+    raise app.UsageError("ERROR crosstool unspecified")
+  if not identifier:
+    raise app.UsageError("ERROR identifier unspecified")
+
+  if not print_field:
+    raise app.UsageError("ERROR print_field unspecified")
+
+  with open(crosstool_filename, "r") as f:
+    text = f.read()
+    text_format.Merge(text, crosstool)
+
+  toolchain_found = False
+  for toolchain in crosstool.toolchain:
+    if toolchain.toolchain_identifier == identifier:
+      toolchain_found = True
+      if not print_field:
+        continue
+      for field, value in toolchain.ListFields():
+        if print_field == field.name:
+          print value
+
+  if not toolchain_found:
+    print "toolchain_identifier %s not found, valid values are:" % identifier
+    for toolchain in crosstool.toolchain:
+      print "  " + toolchain.toolchain_identifier
+
+
+if __name__ == "__main__":
+  app.run(main)