python-pip/allow-stripping-given-prefix-from-wheel-RECORD-files.patch

diff -ru pip-18.0/src/pip/_internal/commands/install.py pip-18.0_patched/src/pip/_internal/commands/install.py
--- pip-18.0/src/pip/_internal/commands/install.py	2018-07-20 06:10:48.000000000 +0200
+++ pip-18.0_patched/src/pip/_internal/commands/install.py	2018-07-23 16:49:39.085357813 +0200
@@ -110,6 +110,14 @@
             default=None,
             help="Installation prefix where lib, bin and other top-level "
                  "folders are placed")
+        cmd_opts.add_option(
+            '--strip-file-prefix',
+            dest='strip_file_prefix',
+            metavar='prefix',
+            default=None,
+            help="Strip given prefix from script paths in wheel RECORD."
+        )
+
 
         cmd_opts.add_option(cmdoptions.build_dir())
 
@@ -345,6 +353,7 @@
                         pycompile=options.compile,
                         warn_script_location=warn_script_location,
                         use_user_site=options.use_user_site,
+                        strip_file_prefix=options.strip_file_prefix,
                     )
 
                     lib_locations = get_lib_location_guesses(
diff -ru pip-18.0/src/pip/_internal/req/req_install.py pip-18.0_patched/src/pip/_internal/req/req_install.py
--- pip-18.0/src/pip/_internal/req/req_install.py	2018-07-22 07:14:20.000000000 +0200
+++ pip-18.0_patched/src/pip/_internal/req/req_install.py	2018-07-23 16:51:51.115943214 +0200
@@ -514,7 +514,7 @@
 
     def move_wheel_files(self, wheeldir, root=None, home=None, prefix=None,
                          warn_script_location=True, use_user_site=False,
-                         pycompile=True):
+                         pycompile=True, strip_file_prefix=None):
         move_wheel_files(
             self.name, self.req, wheeldir,
             user=use_user_site,
@@ -524,6 +524,7 @@
             pycompile=pycompile,
             isolated=self.isolated,
             warn_script_location=warn_script_location,
+            strip_file_prefix=strip_file_prefix,
         )
 
     # Things valid for sdists
@@ -924,7 +925,7 @@
 
     def install(self, install_options, global_options=None, root=None,
                 home=None, prefix=None, warn_script_location=True,
-                use_user_site=False, pycompile=True):
+                use_user_site=False, pycompile=True, strip_file_prefix=None):
         global_options = global_options if global_options is not None else []
         if self.editable:
             self.install_editable(
@@ -939,6 +940,7 @@
                 self.source_dir, root=root, prefix=prefix, home=home,
                 warn_script_location=warn_script_location,
                 use_user_site=use_user_site, pycompile=pycompile,
+                strip_file_prefix=strip_file_prefix,
             )
             self.install_succeeded = True
             return
diff -ru pip-18.0/src/pip/_internal/wheel.py pip-18.0_patched/src/pip/_internal/wheel.py
--- pip-18.0/src/pip/_internal/wheel.py	2018-07-17 10:26:00.000000000 +0200
+++ pip-18.0_patched/src/pip/_internal/wheel.py	2018-07-23 16:52:57.749238655 +0200
@@ -206,7 +206,7 @@
 
 def move_wheel_files(name, req, wheeldir, user=False, home=None, root=None,
                      pycompile=True, scheme=None, isolated=False, prefix=None,
-                     warn_script_location=True):
+                     warn_script_location=True, strip_file_prefix=None):
     """Install a wheel"""
 
     if not scheme:
@@ -507,7 +507,12 @@
                 writer.writerow(row)
             for f in generated:
                 digest, length = rehash(f)
-                writer.writerow((normpath(f, lib_dir), digest, length))
+                final_path = normpath(f, lib_dir)
+                if strip_file_prefix and final_path.startswith(strip_file_prefix):
+                    final_path = os.path.join(os.sep,
+                            os.path.relpath(final_path, strip_file_prefix))
+                writer.writerow((final_path, digest, length))
+
             for f in installed:
                 writer.writerow((installed[f], '', ''))
     shutil.move(temp_record, record)