File fix_bootstrap_vendor.patch of Package rust1.56.22191

From 2d5c62beb847950df890bb99f4d3259455c12e45 Mon Sep 17 00:00:00 2001
From: Alberto Planas <aplanas@suse.com>
Date: Thu, 11 Nov 2021 16:05:32 +0100
Subject: [PATCH] bootstap: create .cargo/config only if not present

In some situations we should want on influence into the .cargo/config
when we use vendored source.  One example is #90764, when we want to
workaround some references to crates forked and living in git, that are
missing in the vendor/ directory.

This commit will create the .cargo/config file only when the .cargo/
directory needs to be created.
---
 src/bootstrap/bootstrap.py | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 38d3c7aec4941..f7a435dd4fd47 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -1119,17 +1119,21 @@ def check_vendored_status(self):
                     raise Exception("{} not found".format(vendor_dir))
 
         if self.use_vendored_sources:
+            config = ("[source.crates-io]\n"
+                      "replace-with = 'vendored-sources'\n"
+                      "registry = 'https://example.com'\n"
+                      "\n"
+                      "[source.vendored-sources]\n"
+                      "directory = '{}/vendor'\n"
+                      .format(self.rust_root))
             if not os.path.exists('.cargo'):
                 os.makedirs('.cargo')
-            with output('.cargo/config') as cargo_config:
-                cargo_config.write(
-                    "[source.crates-io]\n"
-                    "replace-with = 'vendored-sources'\n"
-                    "registry = 'https://example.com'\n"
-                    "\n"
-                    "[source.vendored-sources]\n"
-                    "directory = '{}/vendor'\n"
-                    .format(self.rust_root))
+                with output('.cargo/config') as cargo_config:
+                    cargo_config.write(config)
+            else:
+                print('info: using vendored source, but ./cargo/config is already present.')
+                print('      Reusing the current configuration file')
+                print(config)
         else:
             if os.path.exists('.cargo'):
                 shutil.rmtree('.cargo')