Fix a bug that index url is not correctly saved in Pipfile

pipenv/core.py

@@ -2039,8 +2039,6 @@ def do_install(
                     sp.write_err(vistir.compat.fs_str("{}: {}".format(crayons.red("WARNING"), e)))
                     sp.red.fail(environments.PIPENV_SPINNER_FAIL_TEXT.format("Installation Failed"))
                     sys.exit(1)
-                if index_url:
-                    pkg_requirement.index = index_url
                 no_deps = False
                 sp.text = "Installing..."
                 try:
@@ -2110,6 +2108,13 @@ def do_install(
                     )
                 ))
                 # Add the package to the Pipfile.
+                indexes = list(filter(None, [index_url, extra_index_url]))
+                for index in indexes:
+                    index_name = project.add_index_to_pipfile(
+                        index, verify_ssl=index.startswith("https:")
+                    )
+                    if index_url and not extra_index_url:
+                        pkg_requirement.index = index_name
                 try:
                     project.add_package_to_pipfile(pkg_requirement, dev)
                 except ValueError:

pipenv/project.py

@@ -1006,19 +1006,20 @@ class Project:
         # Read and append Pipfile.
         p = self.parsed_pipfile
         try:
-            self.get_source(url=index)
+            source = self.get_source(url=index)
         except SourceNotFound:
             source = {"url": index, "verify_ssl": verify_ssl}
         else:
-            return
+            return source["name"]
         source["name"] = self.src_name_from_url(index)
         # Add the package to the group.
         if "source" not in p:
-            p["source"] = [source]
+            p["source"] = [tomlkit.item(source)]
         else:
-            p["source"].append(source)
+            p["source"].append(tomlkit.item(source))
         # Write Pipfile.
         self.write_toml(p)
+        return source["name"]
 
     def recase_pipfile(self):
         if self.ensure_proper_casing():