Try branch as rev when commmit hash and tag fail

debugging more

debugging more again

debugging more again

debugging more again

Revert "debugging more again"

This reverts commit 5f71270.

Revert "debugging more again"

This reverts commit 1bd302a.

Revert "debugging more again"

This reverts commit 98dda0d.

Revert "debugging more"

This reverts commit 8330c86.

Revert "debugging"

This reverts commit c2f5b76.

add ability to try branch-name

fix original error error

set newRev correctly

fetch/fetch.go

@@ -229,13 +229,25 @@ func fetchPackage(caches []map[string]*types.Package, importPath string, goPacka
 			"--url", repoRoot.Repo,
 			"--rev", newRev).Output()
 		if err != nil {
-			log.WithFields(log.Fields{
-				"goPackagePath": goPackagePath,
-			}).Error("Fetching failed")
-			return nil, originalErr
-		}
-
-		rev = newRev
+      log.WithFields(log.Fields{
+        "goPackagePath": goPackagePath,
+        "branch":        rev,
+      }).Info("Fetching failed, retrying with rev as branch")
+      stdout, err = exec.Command(
+        "nix-prefetch-git",
+        "--quiet",
+        "--fetch-submodules",
+        "--url", repoRoot.Repo,
+        "--branch-name", rev).Output()
+      if err != nil {
+        log.WithFields(log.Fields{
+          "goPackagePath": goPackagePath,
+        }).Error("Fetching failed")
+        return nil, originalErr
+      }
+		} else {
+		  rev = newRev
+    }
 	}
 
 	var output *prefetchOutput