Description of problem: $ LIBGUESTFS_BACKEND="" guestfish -a /dev/null run libguestfs: error: invalid backend: $ echo $? 0 The error should not be printed. An empty environment variable should use the default. Version-Release number of selected component (if applicable): libguestfs 1.27.62 How reproducible: 100% Steps to Reproduce: 1. See above.
Upstream fix: https://github.com/libguestfs/libguestfs/commit/249aae0c2ffa685008c03f5d06e05c2989b1ec99 (will be in 1.27.64)
Tested with: libguestfs-1.28.1-1.1.el7.x86_64 virt-v2v-1.28.1-1.1.el7.x86_64 1.# LIBGUESTFS_BACKEND="" guestfish -a /dev/null run 2. Test with virt-v2v. # export LIBGUESTFS_BACKEND= # echo $LIBGUESTFS_BACKEND # virt-v2v -ic xen+ssh://10.66.106.64 -os default rhel6.6-pv-x64-test [ 0.0] Opening the source -i libvirt -ic xen+ssh://10.66.106.64 rhel6.6-pv-x64-test virt-v2v: error: because of libvirt bug https://bugzilla.redhat.com/show_bug.cgi?id=1134592 you must set this environment variable: export LIBGUESTFS_BACKEND=direct and then rerun the virt-v2v command. If reporting bugs, run virt-v2v with debugging enabled and include the complete output: virt-v2v -v -x [...] 3.Also tested with other sets,eg:test # LIBGUESTFS_BACKEND="test" guestfish -a /dev/null run libguestfs: error: invalid backend: test # export LIBGUESTFS_BACKEND="test" # virt-v2v -ic xen+ssh://10.66.106.64 -os default rhel6.6-pv-x64-test [ 0.0] Opening the source -i libvirt -ic xen+ssh://10.66.106.64 rhel6.6-pv-x64-test libguestfs: error: invalid backend: test virt-v2v: error: because of libvirt bug https://bugzilla.redhat.com/show_bug.cgi?id=1134592 you must set this environment variable: export LIBGUESTFS_BACKEND=direct and then rerun the virt-v2v command. If reporting bugs, run virt-v2v with debugging enabled and include the complete output: virt-v2v -v -x [...] The error is clear,so move the bug to VERIFIED.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-0303.html