Description of problem:

imho, we need a better handling of ipa-ca-install.

If for any reason it fails like in this case:

====================================
Installing CA into /var/lib/pki/pki-tomcat.

Installation failed: PKI subsystem 'CA' for instance 'pki-tomcat' does NOT
exist!


ipa         : DEBUG    stderr=pkispawn    : ERROR    ....... PKI subsystem 'CA'
for instance 'pki-tomcat' already exists!

ipa.ipaserver.install.cainstance.CAInstance: CRITICAL Failed to configure CA
instance: Command '/usr/sbin/pkispawn -s CA -f /tmp/tmp1OOvuJ' returned
non-zero exit status 1
ipa.ipaserver.install.cainstance.CAInstance: CRITICAL See the installation logs
and the following files/directories for more information:
ipa.ipaserver.install.cainstance.CAInstance: CRITICAL   /var/log/pki/pki-tomcat
====================================

I don't have the possibility of doing a "ipa-ca-install --uninstall"


Instead, the proposal is to delete the full replica to cleanup:

=====================================
Your system may be partly configured.
Run /usr/sbin/ipa-server-install --uninstall to clean up.
=====================================

At master side, we can see:

======================
ipa-csreplica-manage list
Directory Manager password:

ipareplica.gparente.local: CA not configured
ipaserver.gparente.local: master
=======================

If, at replica side, I want to re-install CA, I will find these issues:

========================
ipa         : DEBUG    The ipa-ca-install command failed, exception:
DuplicateEntry: This entry already exists
========================

Because of:

[28/Dec/2016:09:46:38.078814164 -0500] conn=39 op=2 ADD
dn="cn=o\3Dipaca,cn=mapping tree,cn=config"
[28/Dec/2016:09:46:38.079158862 -0500] conn=39 op=2 RESULT err=68 tag=105
nentries=0 etime=0

I can delete ipaca backend completely so as to have no traces and let installer
go on, but if it fails by another reason, it's impossible to go on or repair
either than deleting + uninstalling the full replica.


IMHO, either we do a

ipa-ca-install that performs the exact same steps each time and knows how to
skip already performed actions (ipa-dns-install like) or we provide a

ipa-ca-install --uninstall

command.

Version-Release number of selected component (if applicable):

rpm -q ipa-server
ipa-server-4.4.0-14.el7_3.x86_64