Running virt-customize fails on:
$ virt-customize -v -x --add fedora.qcow2
...
guestfsd: error while loading shared libraries: libaugeas.so.0: cannot open shared object file: No such file or directory
...
But the library is there:
$ ls -alh /usr/lib64/libaugeas.so.0
lrwxrwxrwx. 1 root root 19 Jul 23 02:00 /usr/lib64/libaugeas.so.0 -> libaugeas.so.0.25.0
So this is likely some fishy interaction between libguestfs and the way the sysexts are mounted.