Dependency package get removed when upgrade base package?

[devzero2000]

On Tue, Jul 27, 2010 at 8:50 AM, Huo QiFeng <huoqifeng at gmail.com> wrote:
> If b1 depends on a1 explictly,  and i'm upgrading from a1 to a2? Will b1 be
> removed automatically? Or the upgrading be blocked to instruct user to
> remove b1 first?
I suppose that when you tell : b1 depends on a1 explictly you would tell
that exist in the b1 spec an Requires : a = 1: in this case the
upgrading will block yes
e.g. rpm -Uvh will tell you

error: Failed dependencies:
        a = 1 is needed by (installed) b-1.0-1.noarch

But you can put an Obsoletes: b  in a2 spec and b1 will be removed
automatically. e.g

rpm -q b
b-1.0-1
[root at joke ~]# rpm -Uvh /home/machbuild/rpmbuild/RPMS/a-2-1.noarch.rpm
Preparing...                ########################################### [100%]
   1:a                      ########################################### [100%]
[root at joke ~]# rpm -q b
package b is not installed

hth

>
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> ------------------------------------------------
> Huo QiFeng
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