Include debugpy in debug pex when requested

Author: marcuscaisey

third_party/python/BUILD

@@ -417,9 +417,12 @@ pip_library(
 
 python_wheel(
     name = "debugpy",
-    hashes = ["f058c204341fd7ff800ee0edafc106ca0fb1c9857e8a8895a6e04cca3ddcb7bf"],
+    hashes = ["5be9bed9ae3be00665a06acaa48f8329d2b9632f15fd09f6a9a8c8d9907e54d7"],
     licences = ["MIT"],
-    version = "1.5.0",
+    version = "1.8.20",
+    zip_safe = False,
+    # There doesn't seem to be a predictable URL for this version of debugpy so we need to resolve it instead.
+    tool = "//tools/wheel_resolver",
 )
 
 python_wheel(

tools/please_pex/BUILD

@@ -44,6 +44,7 @@ genrule(
     visibility = ["PUBLIC"],
     deps = [
         "//third_party/python:behave_bootstrap",
+        "//third_party/python:debugpy",
         "//third_party/python:pytest_bootstrap",
         "//third_party/python:unittest_bootstrap",
     ],

tools/please_pex/pex/pex_main.py

@@ -92,6 +92,7 @@ def _explode_zip():
                 # that the cache has already been prepared.
                 lockfile.write("pex unzip completed")
         sys.path = [PEX_PATH] + [x for x in sys.path if x != PEX]
+        sys.path.insert(1, os.path.join(sys.path[0], '.bootstrap'))
         try:
             yield
         finally: