v1 was:
https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/XWE5OXI6UAECLNRUJWBIZ6GCP64KNRQC/

In v2 I reworked it to store the last error message in thread-local
storage.  The thread-local storage is cleared at the start of the
request so (hopefully) errors from one client connection are not
leaked to another, nor between callbacks on the same connection.

Rich.
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