On 2011-09-05 15:27, Andrew Z wrote:
>
> On Mon, Sep 5, 2011 at 6:04 PM, Garrett Holmstrom <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
>     On 2011-09-05 12:51, Andrew Z wrote:
>
>         On Mon, Sep 5, 2011 at 3:43 PM, Garrett Holmstrom
>         <[log in to unmask] <mailto:[log in to unmask]>
>         <mailto:[log in to unmask] <mailto:[log in to unmask]>>__>
>         wrote:
>
>             On 2011-09-05 8:16, Andrew Z wrote:
>
>                 i'm not sure why there is a difference in the output of
>         "rpm -q
>                 --whatrequires " and "yum remove"
>
>
>             The rest of the packages depend on the .so file, not the
>         package name:
>
>             [5508] gholms@lux ~ % rpm -q --whatrequires
>         'libxklavier.so.15()(64bit)'
>
>             libxklavier-4.0-7.el6.x86_64
>             libgnomekbd-2.28.2-2.el6.x86_____64
>             kdebase-workspace-4.3.4-19.____el6.x86_64
>             gnome-settings-daemon-2.28.2-____11.el6.x86_64
>             control-center-2.28.1-25.____el6.x86_64
>             gdm-2.30.4-21.el6_0.1.x86_64
>             gnome-applets-2.28.0-7.el6.____x86_64
>             gnome-screensaver-2.28.3-8.____el6.x86_64
>
>             --
>             Garrett Holmstrom
>
>
>         ---
>         -- slowly descending into more confusion ....
>
>         Garret, can you please run "yum remove libxklavier"?
>
>
>     It would be better to just explain what is actually happening.  The
>     libxklavier package provides three things:
>
>     [5610] gholms@lux ~ % rpm -q --provides libxklavier.x86_64
>
>     libxklavier.so.15()(64bit)
>     libxklavier = 4.0-7.el6
>     libxklavier(x86-64) = 4.0-7.el6
>
>     The first of these is the library itself, namely
>     /usr/lib64/libxklavier.so.15.  rpmbuild automatically adds
>     dependencies of this type to packages that link against shared
>     libraries.
>
>     The rest are used for things that depend on the package by name.
>       For instance, this includes gnome-applets-2.28.0-7.el6.__x86_64's
>     dependency on "libxklavier >= 4.0".
>
>     By having yum remove the libxklavier package you remove all three of
>     these, but your rpm query only searched for things that depend on
>     the second.  To get an accurate list of what directly depends on a
>     package you must check *everything* that the package provides.
>
>     [5616] gholms@lux ~ % rpm -q --provides libxklavier.x86_64 | sed
>     's/=.*//' | xargs rpm -q --whatrequires | sort | uniq
>
>     control-center-2.28.1-25.el6.__x86_64
>     gdm-2.30.4-21.el6_0.1.x86_64
>     gnome-applets-2.28.0-7.el6.__x86_64
>     gnome-screensaver-2.28.3-8.__el6.x86_64
>     gnome-settings-daemon-2.28.2-__11.el6.x86_64
>     kdebase-workspace-4.3.4-19.__el6.x86_64
>     libgnomekbd-2.28.2-2.el6.x86___64
>     libxklavier-4.0-7.el6.x86_64
>     no package requires libxklavier(x86-64)
>
>     --
>     Garrett Holmstrom
>
>
> Garrett,
>   i think i'm hang up on the definition of "requires". To me it means
> "won't work if removed". But with this definition i have problem
> digesting the difference in "Yum remove" output and your (really cool)
> one line.

That is exactly what "requires" means here.  rpm enforces these 
dependencies by refusing to allow you to remove something when something 
else depends upon it.  Yum knows this, so when you tell yum to remove a 
package it generally removes everything that depends upon it as well. 
So if you remove libxklavier.x86_64 then it will also remove everything 
in the list given by the above rpm query.  Everything that depends on 
*those* packages, then, also gets removed, and so forth.  This is what 
yum means by "removing for dependencies".

-- 
Garrett Holmstrom