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steps to reproduce: 1. having a network xml file(named default.xml) like this one: <network> <name>default</name> <uuid>c5322c4c-81d0-4985-a363-ad6389780d89</uuid> <bridge name="virbr0" /> <forward/> <ip address="192.168.122.1" netmask="255.255.255.0"> <dhcp> <range start="192.168.122.2" end="192.168.122.254" /> </dhcp> </ip> </network> in /etc/libvirt/qemu/networks/, and mark it as autostart: $ ls -l /etc/libvirt/qemu/networks/autostart total 0 lrwxrwxrwx 1 root root 14 Oct 12 14:02 default.xml -> ../default.xml 2. start libvirtd and the device virbr0 is not automatically up. The reason is that the function virNetDevExists is now returns 1 if the device exists, comparing to the former one returns 0 if the device exists. But with only this fix will cause a segmentation fault(the same steps as above) that is fixed by the second chunk of code.
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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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