Peter Krempa a751e3452b virsh: volume: Fix lookup of volumes to provide better error messages
If a user specifies the pool explicitly, we should make sure to point
out that it's inactive instead of falling back to lookup by key/path and
failing at the end. Also if the pool isn't found there's no use in
continuing the lookup.

This changes the error in case the user-selected pool is inactive from:

 $ virsh vol-upload --pool inactivepool --vol somevolname volcontents
 error: failed to get vol 'somevolname'
 error: Storage volume not found: no storage vol with matching path
 somevolname

To a more descriptive:

 $ virsh vol-upload --pool inactivepool --vol somevolname volcontents
 error: pool 'inactivepool' is not active

And in case a user specifies an invalid pool from:

 $ virsh vol-upload --pool invalidpool --vol somevolname volcontents
 error: failed to get pool 'invalidpool'
 error: failed to get vol 'somevolname', specifying --pool might help
 error: Storage volume not found: no storage vol with matching path somevolname

To something less confusing:

 $ virsh vol-upload --pool invalidpool --vol somevolname volcontents
 error: failed to get pool 'invalidpool'
 error: Storage pool not found: no storage pool with matching name 'invalidpool'
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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