Please attach /var/log/redhat_upgrade_tool.log.

The versions of the packages in the errors are from RHEL 7.1, so it looks like something went wrong in the repo setup.

Created attachment 1120486 [details]
Log

Created attachment 1121125 [details]
/usr/bin/redhat-upgrade-tool with logging fix

There's a bug in the logging in the main script. I've attached a new version of the main redhat-upgrade-tool script. Can you replace the script in /usr/bin with the attachment, run redhat-upgrade-tool again, and attach the /var/log/redhat_upgrade_tool.log from that?

The diff is just this:

diff --git a/redhat-upgrade-tool.py b/redhat-upgrade-tool.py
index 0a614ee..28caef2 100755
--- a/redhat-upgrade-tool.py
+++ b/redhat-upgrade-tool.py
@@ -46,7 +46,7 @@ from preup import xccdf
 from preup import settings
 
 import logging
-log = logging.getLogger("redhat-upgrade-tool")
+log = logging.getLogger("redhat_upgrade_tool.main")
 def message(m):
     print m
     log.info(m)

Ups, I have just returned the machine. I will take another, but it may take some time.

Created attachment 1121424 [details]
Logs

Different machine, different error:
getting boot images...
.treeinfo                                                | 2.2 kB     00:00     
setting up update...
verify local files 100% [======================================================]
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Importing GPG key 0xFD431D51:
 Userid : Red Hat, Inc. (release key 2) <security>
 Package: redhat-release-server-6Server-6.7.0.3.el6.x86_64 (@anaconda-RedHatEnterpriseLinux-201507020259.x86_64/6.7)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Importing GPG key 0x2FA658E0:
 Userid : Red Hat, Inc. (auxiliary key) <security>
 Package: redhat-release-server-6Server-6.7.0.3.el6.x86_64 (@anaconda-RedHatEnterpriseLinux-201507020259.x86_64/6.7)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

Downloading failed: Didn't install any keys

The key error is normal. redhat-upgrade-tool attempts to check gpg signatures by default, and the packages on download.devel are not signed. You can add --nogpgcheck to the command line for that.

Obviously this isn't the most friendly failure mode. I think there's a bug open to ask the user whether to add the keys, like yum does, instead of just failing.

Thanks, it finished OK. I will retry on another machine and will try to exactly reproduce the steps that lead to the failure.

Created attachment 1121453 [details]
Logs

I finally reproduced the problem by using the following steps (some may be redundant):
# cd /etc/yum.repos.d
# wget 'http://git.app.eng.bos.redhat.com/git/preupgrade-assistant.git/plain/repo-files/preupgrade-el6.repo'
# cd
# yum install redhat-upgrade-tool preupgrade-assistant-contents
# redhat-upgrade-tool-cli --cleanup-post --addrepo optional=http://download.devel.redhat.com/released/RHEL-7/7.0/Server-optional/x86_64/os/ --instrepo=http://download.devel.redhat.com/released/RHEL-7/7.0/Server/x86_64/os --network 7.0
# preupg --force -s RHEL6_7
# redhat-upgrade-tool-cli --cleanup-post --addrepo optional=http://download.devel.redhat.com/released/RHEL-7/7.0/Server-optional/x86_64/os/ --instrepo=http://download.devel.redhat.com/released/RHEL-7/7.0/Server/x86_64/os --network 7.0
# redhat-upgrade-tool-cli --cleanup-post --addrepo optional=http://download.devel.redhat.com/released/RHEL-7/7.0/Server-optional/x86_64/os/ --instrepo=http://download.devel.redhat.com/released/RHEL-7/7.2/Server/x86_64/os --network 7.2
# redhat-upgrade-tool-cli --cleanup-post --addrepo optional=http://download.devel.redhat.com/released/RHEL-7/7.2/Server-optional/x86_64/os/ --instrepo=http://download.devel.redhat.com/released/RHEL-7/7.2/Server/x86_64/os --network 7.2

I think the last two steps are important. The cache/workdir is probably not cleared.

I see. The quick fix is don't do that ;-)  I'll add a check for whether there is an existing upgrade directory and print a message about it needing to be cleaned before another upgrade can be run.

Fix prepared:
https://github.com/upgrades-migrations/redhat-upgrade-tool/commit/d3968611e3b81bdc53e83d472bea813880898b53
This is a minor bug so it will be added to a next version of the tool.

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, 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://rhn.redhat.com/errata/RHEA-2016-2619.html