[7.1.0] StarlarkBaseExternalContext.java: propagate error message whe…

…n deleting temporary directory failed (#21555)

Related: #20013
Commit
5b4ba3e

PiperOrigin-RevId: 585046630
Change-Id: Ifdf098e7d54c1d5dca85a39afd7694dc828331a4

Co-authored-by: Googler <pcloudy@google.com>

src/main/java/com/google/devtools/build/lib/bazel/repository/starlark/StarlarkBaseExternalContext.java

@@ -970,7 +970,11 @@ public StructImpl downloadAndExtract(
     } catch (IOException e) {
       throw new RepositoryFunctionException(
           new IOException(
-              "Couldn't delete temporary directory (" + downloadDirectory.getPathString() + ")", e),
+              "Couldn't delete temporary directory ("
+                  + downloadDirectory.getPathString()
+                  + "): "
+                  + e.getMessage(),
+              e),
           Transience.TRANSIENT);
     }
     return downloadResult;