[libvirt] [PATCH 1/4] Add APIs for formatting systemd slice/scope names

[Daniel P. Berrange]

On Sun, Dec 15, 2013 at 07:09:19PM +0100, Richard Weinberger wrote:
> On Fri, Jul 26, 2013 at 5:48 PM, Daniel P. Berrange <berrange at redhat.com> wrote:
> > +char *virSystemdMakeScopeName(const char *name,
> > +                              const char *drivername,
> > +                              const char *partition)
> > +{
> > +    virBuffer buf = VIR_BUFFER_INITIALIZER;
> > +
> > +    if (*partition == '/')
> > +        partition++;
> > +
> > +    virSystemdEscapeName(&buf, partition);
> > +    virBufferAddChar(&buf, '-');
> > +    virSystemdEscapeName(&buf, drivername);
> > +    virBufferAddLit(&buf, "\\x2d");
> 
> What is the idea behind this?
> Now we end up with paths like:
> /sys/fs/cgroup/memory/machine.slice/machine-lxc\x2dmyfunnycontainer.scope

The string prefix 'machine' is a special systemd string. The second part
is the libvirt name 'lxc-$containername'. Systemd requires that the '-' be
escaped hence we use '\x2d' here. You'll see this in a number of other
systemd unit names too.

Daniel
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