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

diff --git a/src/pip/_internal/commands/install.py b/src/pip/_internal/commands/install.py
index 6fc178f..1279d4a 100644
--- a/src/pip/_internal/commands/install.py
+++ b/src/pip/_internal/commands/install.py
@@ -115,6 +115,14 @@ class InstallCommand(RequirementCommand):
             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())
 
@@ -364,6 +372,7 @@ class InstallCommand(RequirementCommand):
                         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 --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index c2624fe..922d10c 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -370,7 +370,7 @@ class InstallRequirement(object):
 
     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,
@@ -380,6 +380,7 @@ class InstallRequirement(object):
             pycompile=pycompile,
             isolated=self.isolated,
             warn_script_location=warn_script_location,
+            strip_file_prefix=strip_file_prefix,
         )
 
     # Things valid for sdists
@@ -743,7 +744,7 @@ class InstallRequirement(object):
 
     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(
@@ -758,6 +759,7 @@ class InstallRequirement(object):
                 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 --git a/src/pip/_internal/wheel.py b/src/pip/_internal/wheel.py
index 5ce890e..c42d77a 100644
--- a/src/pip/_internal/wheel.py
+++ b/src/pip/_internal/wheel.py
@@ -206,7 +206,7 @@ def message_about_scripts_not_on_PATH(scripts):
 
 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:
@@ -508,7 +508,11 @@ if __name__ == '__main__':
                 outrows.append(tuple(row))
             for f in generated:
                 digest, length = rehash(f)
-                outrows.append((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))
+                outrows.append((final_path, digest, length))
             for f in installed:
                 outrows.append((installed[f], '', ''))
             for row in sorted(outrows):