Bug 250672

Summary:	yum-allowdowngrade doesn't seem to work
Product:	[Fedora] Fedora	Reporter:	Bryan Mason <nobody+bjmason>
Component:	yum-utils	Assignee:	Seth Vidal <skvidal>
Status:	CLOSED UPSTREAM	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6	CC:	coryb, pmatilai, tim.lauridsen
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2008-03-14 21:03:22 UTC	Type:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Bryan Mason 2007-08-02 20:13:21 UTC

Description of problem:
The yum-allowdowngrade plugin doesn't allow downgrading a package

Version-Release number of selected component (if applicable):
yum-allowdowngrade-1.1.5-1

How reproducible:
Every time.

Steps to Reproduce:
# yum list minicom
Loading "installonlyn" plugin
Loading "allowdowngrade" plugin
Setting up repositories
Reading repository metadata in from local files
Installed Packages
minicom.i386                             2.2-1.fc6              installed       
Available Packages
minicom.i386                             2.1-3                  core            

# yum --allow-downgrade update minicom-2.1-3
Loading "installonlyn" plugin
Loading "allowdowngrade" plugin
Setting up Update Process
Setting up repositories
core                      100% |=========================| 1.1 kB    00:00     
updates                   100% |=========================| 1.2 kB    00:00     
freshrpms                 100% |=========================| 2.1 kB    00:00     
extras                    100% |=========================| 1.1 kB    00:00     
brew                      100% |=========================|  951 B    00:00     
Reading repository metadata in from local files
Could not find update match for minicom-2.1-3
No Packages marked for Update/Obsoletion

# yum --allow-downgrade update minicom-2.1-3.i386
Loading "installonlyn" plugin
Loading "allowdowngrade" plugin
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Could not find update match for minicom-2.1-3.i386
No Packages marked for Update/Obsoletion

Actual results:
"Could not find update match for minicom-2.1-3.i386
No Packages marked for Update/Obsoletion"

Expected results:
minicom-2.1-3 should be installed

Additional info:
This was initially tested (and failed) with yum-allowdowngrade 1.0.3-1.fc6 with
Fedora Core 6.  I downloaded yum-utils-1.1.5-1 from Fedora 7 and rebuilt for FC6
just to make sure it wasn't fixed in the latest release.

Comment 1 Panu Matilainen 2007-08-07 09:34:03 UTC

You'll need to use install instead of update, and apparently the matching is
fairly picky: you can't specify epoch or arch. The following ought to work
though (at least it works here on F7)

# yum --allow-downgrade install minicom-2.1-3

Comment 2 Panu Matilainen 2007-08-07 09:48:17 UTC

Hrm... "works" with some luck in some cases but certainly not in every case.
Looks like it only works if the version is different and not just release or
something. That package parsing happens within yum itself, not the plugin which
only flips a switch that makes rpm transaction permit the downgrade.

Comment 3 Seth Vidal 2008-03-14 21:03:22 UTC

okay I've tested allow-downgrade on yum 3.2.12 and yum-utils 1.1.11. it appears
to behave and work properly for:

install name-ver
install name-ver-rel
install name-ver-rel.arch

I think we've fixed it in some of the yum changes recently.