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Re: a dependency is not being detected?

On Wed, Feb 10, 2010 at 10:57 AM, Seth Vidal <skvidal@xxxxxxxxxxxxxxxxx> wrote:
On Wed, 10 Feb 2010, Fulko Hew wrote:

I've been perplexed by yum....

I have a package (rpm) I've created.  One if its dependencies is
'perl-SNMP-Session'. When I build my package the process reports
(trimmed for brevity):

Requires: /bin/sh /usr/bin/perl bash chkconfig coreutils grep
initscripts mysql-server perl >= 0:5.002 perl(AutoLoader)

To install, I use: 'yum install --nogpgcheck MyPackage.rpm'

On Fedora boxes (example F12) it detects the missing dependency
and also installs perl-SNMP-Session, but on an RHEL 5.4 box it
doesn't report the missing dependency.

Note: The RHEL 5.4 box does have the mrtg package installed,
and that package has a copy of the relevant files I need,
(but the mrtg package doesn't install them into a location that Perl can find.)

# rpm -qa --filesbypkg | grep SNMP_Session
mrtg     /usr/lib/mrtg2/SNMP_Session.pm

Using the 'verbose' flag during yum install, it says:

looking for ('perl(SNMP_Session)', None, (None, None, None)) as a requirement of MyPackage.noarch 0-1.0-5 u

but:  'yum list "*SNMP_Session*"' reports it as 'available', _not_ 'installed':

Available Packages:
perl-SNMP_Session.noarch     1.12-3.el5.1    epl

So the question is...
if its not installed, why isn't it being required/found as a missing dependency?

rpm -qR mypackage.rpm

b/c I suspect the things providing perl(SNMP_Session) are different on el5 than on f12.

Running the above command (without the .rpm extension) results in a list
that contains the 'perl(SNMP_Session)'

What I think is different is: on el5, the mrtg package was installed, and on my f12 I didn't.

Pursuing it  further on el5... when I ran yum deplist MyPackage I see:

dependency: perl(SNMP_Session)
  provider: perl-SNMP_session.noarch 1.12-3.el5.1
  provider mrtg.i386 2.14.5-2

... that led me to look at mrtg with:
rpm -q --provides mrtg

and it reports amongst other things:


so it seems to me that, the _other_ package (mrtg) is reporting
that it is 'providing' a resolvable resource, that other packages
should be able to use (even though they only have a private
copy in a private location)

... and that is telling yum, that what _I_ need 'should' be installed because
mrtg is telling it so... incorrectly.

I would think the 'correct' answer would be to 'fix' mrtg so that
it doesn't tell yum/rpm that it is providing something that
others can't find/use.

I tested this by erasing the mrtg package and re-installing MyPackage...
... still no joy, because yum knows perl-SNMP-Session can be resolved
by either mrtg or perl-SNMP_Session (as shown above) and it still
picked mrtg as the way to go.

My only recourse (at the moment) seems to be to manually install
perl-SNMP-Session first, and then MyPackage.


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