Installing dependencies only

[Paul Howarth]

Paul Smith wrote:
> On 3/26/06, Paul Howarth <paul at city-fan.org> wrote:
>>>>>>> Is it possible with yum and with only one instruction to install not a
>>>>>>> certain package but all its dependencies?
>>>>>> That is the normal behaviour.  You ask for one package, and if you
>>>>>> already have all the dependencies you will get one package.  If you
>>>>>> haven't got them all you may find that it says it needs to install 3 or
>>>>>> more.  It always asks permission before installing.
>>>>> Thanks, Anne, but it is not what I wanted to mean: imagine that the
>>>>> package x.rpm has, as dependencies, the packages y.rpm and z.rpm; in
>>>>> this case, I would like to install only the dependencies, i.e., only
>>>>> y.rpm and z.rpm, and NOT x.rpm.
>>>>>
>>>> All I can suggest, then, is to ask yum for the original package, then when it
>>>> lists the necessaries, reject the install and give a new yum command listing
>>>> the required dependency packages.
>>>>
>>>> It seems a rather strange requirement, so telling the reason for the
>>>> requirement may spark of some better solution from a more knowledgeable
>>>> poster.
>>> Taking my example above, x.rpm is not supplied by any repository;
>>> then, a simple method to install it is
>>>
>>> yum localinstall x.rpm
>>>
>>> With this procedure, I will know the dependencies, which I will install before
>>>
>>> rpm -ihv x.rpm
>>>
>>> as "yum localinstall" is not able to install x.rpm due to the fact
>>> that x.rpm is not signed.
>> Two ways of installing x.rpm plus its dependencies:
>>
>> First way, doesn't involve changing any config files:
>> # (echo config gpgcheck 0; echo localinstall x.rpm; echo run) | yum -y
>> shell
>>
>> (that's all one line)
>>
>>
>> Second way, involves file edits first:
>> Edit /etc/yum.conf and change gpgcheck=1 to gpgcheck=0
>> Edit all of your /etc/yum.repos.d/*.repo files and add gpgcheck=1 to any
>> repo entry that doesn't have a gpgcheck entry.
>>
>> Then you should just be able to do:
>> # yum localinstall x.rpm
> 
> Thanks, Paul. I will try to automate your first solution with a script.

Another possibility you could consider would be to install Thomas 
Springer's YUM GPG Signature Check Plugin 
(http://www.cs.uni-frankfurt.de/~springer/yum-plugin/), which adds a 
--gpgcheck option to yum, so you can do:

# yum --gpgcheck=0 localinstall x.rpm

Paul.