[Libguestfs] [PATCH 4/5] mltools: curl: turn Curl.run to raise exceptions

[Richard W.M. Jones]

I can see where you're going with this, but it does make the Curl
module more error-prone.  You need to use an exception since there is
a long distance between where the Curl command fails and where you
want to handle the failure.

I would say that you should add a special variation of [Curl.run]
which raises an exception and leave the existing [Curl.run] alone.

Existing users won't be accidentally affected while virt-builder can
use the exception-raising variant where appropriate.

At the same time I would also change common/mltools/tools_utils.ml:
run_main_and_handle_errors so it knows about the new exception and can
print a suitable (internal?) error.

Rich.

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