This bug was initially created as a copy of Bug #1800564

I am copying this bug because: to track fix for RHEL8



Description of problem:
python-sssd package should have a weak dependency on sssd-config because the call to SSSDConfig() requires the file /usr/share/sssd/sssd.conf.api to be present, and this file is provided by sssd-common.

Version-Release number of selected component (if applicable):
sssd-1.16.4-35.el7.x86_64

How reproducible:
always

Steps to Reproduce:

freeipa tests are using SSSDConfig() python API to  modify sssd.conf from another node.
On host A (=the test controller), only python-sssd package is installed. On host B (=freeipa master), sssd is configured (with python-sssd, sssd-common, sssd-client).
The host A is copying sssd.conf from host B, then locally uses SSSDConfig() to modify the conf and later copies the modified sssd.conf file to host B.

The following error happens when host A calls SSSDConfig():
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pytest_ipa/integration/tasks.py:741: in modify_sssd_conf
    sssd_config = SSSDConfig()
../SSSDConfig/__init__.py:1424: in __init__
    self.schema = SSSDConfigSchema(schemafile, schemaplugindir)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <SSSDConfig.SSSDConfigSchema object at 0x7f3fc57a9ed0>
schemafile = '/usr/share/sssd/sssd.api.conf'
schemaplugindir = '/usr/share/sssd/sssd.api.d'

    def __init__(self, schemafile, schemaplugindir):
        SSSDChangeConf.__init__(self)
        #TODO: get these from a global setting
        if not schemafile:
            schemafile = '/usr/share/sssd/sssd.api.conf'
        if not schemaplugindir:
            schemaplugindir = '/usr/share/sssd/sssd.api.d'
    
        try:
            # Read the primary config file
>           with open(schemafile, 'r') as fd:
E           IOError: [Errno 2] No such file or directory: '/usr/share/sssd/sssd.api.conf'

schemafile = '/usr/share/sssd/sssd.api.conf'
schemaplugindir = '/usr/share/sssd/sssd.api.d'
self       = <SSSDConfig.SSSDConfigSchema object at 0x7f3fc57a9ed0>

../SSSDConfig/__init__.py:508: IOError


Actual results:
IOError when calling SSSDConfig() if the package sssd-common is not installed.

Expected results:
No IOError.