Display proper message when patch checksum doesn't match (spack#24229)

iarspider · web-flow · commit ea08e93f2fcd · 2021-06-11T10:31:33.000+02:00
diff --git a/lib/spack/spack/patch.py b/lib/spack/spack/patch.py
@@ -291,7 +291,7 @@ def from_dict(dictionary):
         if not checker.check(patch.path):
             raise fs.ChecksumError(
                 "sha256 checksum failed for %s" % patch.path,
-                "Expected %s but got %s" % (sha256, checker.sum),
+                "Expected %s but got %s " % (sha256, checker.sum) +
                 "Patch may have changed since concretization.")
         return patch
     else:
