Only replace with a go_mod_download if the path is different in the r…

…eplace directive (please-build#97)

* Only replace with a go_mod_download if the path is different in the
replace directive

---------

Co-authored-by: rgodden <rgodden@thoughtmachine.net>

ChangeLog

@@ -1,3 +1,9 @@
+Version 1.5.1
+------------
+    * Sync: if we encounter a replace directive where the old path and new
+      path are the same don't delete the target as we can just update the
+      version.
+
 Version 1.5.0
 ------------
     * Migrate: Avoid duplicating `go_repo()` targets when migrating a module where
@@ -78,4 +84,4 @@ Version 0.2.0
 
 Version 0.1.0
 ------------
-    * Initial release
+    * Initial release

VERSION

@@ -1 +1 @@
-1.5.0
+1.5.1

sync/sync.go

@@ -83,8 +83,11 @@ func (s *Sync) syncModFile(conf *config.Config, file *build.File, exitingRules m
 		var replace *modfile.Replace
 		for _, r := range f.Replace {
 			if r.Old.Path == req.Mod.Path {
+				reqVersion = r.New.Version
+				if r.New.Path == req.Mod.Path { // we are just replacing version so don't need a replace
+					continue
+				}
 				replace = r
-				reqVersion = replace.New.Version
 			}
 		}