What is the usage of an empty RPM ?

[Adam Miller]

On Tue, Feb 4, 2014 at 11:46 AM, Kevin Wilson <wkevils at gmail.com> wrote:

> Hi,
> Thanks to Adam and Daniel for the quick answer.
>
> I am not an expert about RPMs. I just wonder where are these
> dependencies defined for libvirt (and in general for other RPMs),
> since the libvirt RPM file itself is an empty file ?
>
> Regards,
> Kevin
>

They are defined in the RPM's spec file used to build the RPM itself.

libvirt is a complex package so it's spec file isn't necessarily the best
candidate for someone who's not experienced in RPM packaging but if you
look at the lines that list out "Requires: " (not "BuildRequires:"), it
will at least show where the dependencies originate.

http://pkgs.fedoraproject.org/cgit/libvirt.git/tree/libvirt.spec

-AdamM


>
>
> On Tue, Feb 4, 2014 at 7:37 PM, Adam Miller
> <maxamillion at fedoraproject.org> wrote:
> >
> >
> >
> > On Tue, Feb 4, 2014 at 11:30 AM, Kevin Wilson <wkevils at gmail.com> wrote:
> >>
> >> Hi,
> >> What is the usage of an empty RPM ? What it is for ?
> >> For example, on Fedora 20:
> >>
> >>  rpm -qpl  libvirt-1.1.3.3-2.fc20.x86_64.rpm
> >> shows:
> >> (contains no files)
> >
> >
> > It's effectively a meta-package that pulls in dependencies.
> >
> > # yum deplist libvirt
> > package: libvirt.x86_64 1.2.1-2.fc21
> >   dependency: /bin/sh
> >    provider: bash.x86_64 4.2.45-6.fc21
> >   dependency: libvirt-client = 1.2.1-2.fc21
> >    provider: libvirt-client.x86_64 1.2.1-2.fc21
> >    provider: libvirt-client.i686 1.2.1-2.fc21
> >   dependency: libvirt-daemon = 1.2.1-2.fc21
> >    provider: libvirt-daemon.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-config-network = 1.2.1-2.fc21
> >    provider: libvirt-daemon-config-network.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-config-nwfilter = 1.2.1-2.fc21
> >    provider: libvirt-daemon-config-nwfilter.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-interface = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-interface.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-libxl = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-libxl.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-lxc = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-lxc.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-network = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-network.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-nodedev = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-nodedev.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-nwfilter = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-nwfilter.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-qemu = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-qemu.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-secret = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-secret.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-storage = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-storage.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-uml = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-uml.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-vbox = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-vbox.x86_64 1.2.1-2.fc21
> >   dependency: libvirt-daemon-driver-xen = 1.2.1-2.fc21
> >    provider: libvirt-daemon-driver-xen.x86_64 1.2.1-2.fc21
> >
> >
> > -AdamM
> >
> >>
> >>
> >> Regards,
> >> Kevin Wilson
> >>
> >> --
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> >
> >
> >
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