Shorten the path used for the processor script. (#311)

Use a hash of the first output rather than the full path so it is
less likely to hit path limits when the target where the helper is
used is also deep in a directory structure.

PiperOrigin-RevId: 608607365
(cherry picked from commit 832646c)

Co-authored-by: Thomas Van Lenten <[email protected]>

lib/apple_support.bzl

@@ -391,16 +391,19 @@ def _run(
         return
 
     # Since a label/name isn't passed in, use the first output to derive a name
-    # that will hopefully be unique. For added attempt at safety, name the file
-    # based on the content, so any dup actions might still merge.
-    base = kwargs.get("outputs")[0].short_path.replace("/", "_")
+    # that will hopefully be unique.
+    output0 = kwargs.get("outputs")[0]
     if xcode_path_resolve_level == _XCODE_PATH_RESOLVE_LEVEL.args:
         script = _XCODE_PROCESSOR__ARGS
         suffix = "args"
     else:
         script = _XCODE_PROCESSOR__ARGS_AND_FILES
         suffix = "args_and_files"
-    processor_script = actions.declare_file("{}_processor_script_{}.sh".format(base, suffix))
+    processor_script = actions.declare_file("{}_{}_processor_script_{}.sh".format(
+        output0.basename,
+        hash(output0.short_path),
+        suffix,
+    ))
     actions.write(processor_script, script, is_executable = True)
 
     processed_kwargs = _kwargs_for_apple_platform(