Bug 1790433

Minor packaging issue, will be resolved via rebase.

*** This bug has been marked as a duplicate of bug 1792971 ***

This issue is still present in pcp-5.1.1-2.el8 build.

In RHEL-8.3.0, we only seem to have net-snmp-perl, which provides perl(SNMP), basically net-snmp v5. The pmdasnmp.pl script wants to use Net::SNMP but the PCP RPM spec only has the install dependency for non-RHEL / Fedora.

The missing dependency would be satisfied by a dep on 'perl(Net::SNMP)', which is provided by the perl-Net-SNMP package, which itself has a dep on 'perl(Crypt::DES)', provided by the perl-Crypt-DES package.

The perl-Net-SNMP and perl-Crypt-DES packages are actually built for el8 and if I manually install them using the full URL to the RPMs, the PCP SNMP PMDA works correctly, e.g. :

# dnf install http://download.eng.bos.redhat.com/brewroot/packages/perl-Net-SNMP/6.0.1/19.el8+5/noarch/perl-Net-SNMP-6.0.1-19.el8+5.noarch.rpm http://download.eng.bos.redhat.com/brewroot/packages/perl-Crypt-DES/2.07/12.el8+5/x86_64/perl-Crypt-DES-2.07-12.el8+5.x86_64.rpm

However, neither perl-Net-SNMP nor perl-Crypt-DES seem to be in any RHEL8.3.0 repos. We only have net-snmp-perl. The required packages are not available as modules either (dnf module list | grep -i -e snmp -e perl ... doesn't show anything promising).

Checking the nightly appstream compose, we have quite a few perl-net-* packages, but not the SNMP or Crypt-DES packages.

http://download.hosts.prod.upshift.rdu2.redhat.com/nightly/latest-RHEL-8/compose/AppStream/x86_64/os/Packages/
perl-Net-DNS-1.15-1.el8.noarch.rpm
perl-Net-HTTP-6.17-2.module+el8.3.0+6498+9eecfe51.noarch.rpm
perl-Net-HTTP-6.17-2.module+el8.3.0+6498+31ea7642.noarch.rpm
perl-Net-HTTP-6.17-2.module+el8.3.0+6498+fb59cb73.noarch.rpm
perl-Net-Ping-2.43-404.module+el8.1.0+2926+ce7246ad.noarch.rpm
perl-Net-Ping-2.55-416.el8.noarch.rpm
perl-Net-Ping-2.71-451.module+el8.3.0+6961+31ca2e7a.noarch.rpm
perl-Net-SMTP-SSL-1.04-5.el8.noarch.rpm
perl-Net-SSLeay-1.88-1.module+el8.3.0+6446+37a50855.x86_64.rpm  
perl-Net-SSLeay-1.88-1.module+el8.3.0+6446+594cad75.x86_64.rpm
perl-Net-SSLeay-1.88-1.module+el8.3.0+6452+449fe210.x86_64.rpm
perl-Net-Server-2.009-3.el8.noarch.rpm
and  net-snmp-perl-5.8-15.el8.x86_64.rpm

If the missing packages were available, the spec patch would be :

--- pcp.spec.orig	2020-06-22 13:04:53.865655623 +1000
+++ pcp.spec	2020-06-22 14:58:15.451975535 +1000
@@ -1381,10 +1381,7 @@
 URL: https://pcp.io
 Requires: pcp = %{version}-%{release} pcp-libs = %{version}-%{release}
 Requires: perl-PCP-PMDA = %{version}-%{release}
-# There are no perl-Net-SNMP packages in rhel, disable unless non-rhel or epel5
-%if 0%{?rhel} == 0 || 0%{?rhel} < 6
 Requires: perl(Net::SNMP)
-%endif

resolved with commit bc4abb291 pmdasnmp: add Install checks for the required Net::SNMP module

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (pcp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4684

(In reply to Mark Goodwin from comment #3)
>...
> If the missing packages were available, the spec patch would be :
> 
> --- pcp.spec.orig	2020-06-22 13:04:53.865655623 +1000
> +++ pcp.spec	2020-06-22 14:58:15.451975535 +1000
> @@ -1381,10 +1381,7 @@
>  URL: https://pcp.io
>  Requires: pcp = %{version}-%{release} pcp-libs = %{version}-%{release}
>  Requires: perl-PCP-PMDA = %{version}-%{release}
> -# There are no perl-Net-SNMP packages in rhel, disable unless non-rhel or
> epel5
> -%if 0%{?rhel} == 0 || 0%{?rhel} < 6
>  Requires: perl(Net::SNMP)
> -%endif

Was this change really applied to the package source tree?

# rpm -q pcp-pmda-snmp
pcp-pmda-snmp-5.3.5-8.el8.x86_64
# rpm -q --requires pcp-pmda-snmp
/bin/sh
/bin/sh
config(pcp-pmda-snmp) = 5.3.5-8.el8
pcp = 5.3.5-8.el8
pcp-libs = 5.3.5-8.el8
perl-PCP-PMDA = 5.3.5-8.el8
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
# /usr/libexec/pcp/pmdas/snmp/Install
Net::SNMP (Simple Network Management Protocol) perl module is not installed

I should open a new bug.

I read https://github.com/performancecopilot/pcp/commit/bc4abb29171ce5437b7f59a7dad0f94b06e5f7a4.
The change implies RHEL8 doesn't and will not provide perl(Net::SNMP).