Re: [libvirt] [Xen-devel] [PATCH 0/5] Testing libvirt XML -> libxl_domain_config conversion

On Fri, 2014-05-30 at 18:24 +0100, Daniel P. Berrange wrote: > I hit a couple of small issues with libxl, which I worked around, when > writing this test which I why I'm copying xen-devel > > - libxl_ctx_alloc() will call xs_daemon_open and xc_interface_open, > and stat /var/run/xenstored.pid to see if Xen is actually running. > This fails when run on non-Xen hosts (and also possibly if run > unprivileged). > > I used an evil LD_PRELOAD hack to stub out xs_daemon_open and > xc_interface_open to return (void*)0x1, and also turn > xc_interface_close and xs_daemon_close to no-ops, and make > stat() always return success for xenstored.pid. > > This works (evidenced by the fact that if something was needing > these xs/xc handles they would have crashed referencing 0x1), > but at the same time it might be an idea to have an officially > supported "non live" mode for libxl_ctx_alloc() turned on by a > flag of some sort. Yes, we absolutely should have this.