Created attachment 1479701 [details]
File: _var_log_dnf.log

Created attachment 1479702 [details]
File: backtrace

Created attachment 1479703 [details]
File: cgroup

Created attachment 1479704 [details]
File: cpuinfo

Created attachment 1479705 [details]
File: dnf-makecache.log

Created attachment 1479706 [details]
File: environ

Created attachment 1479707 [details]
File: mountinfo

Created attachment 1479708 [details]
File: namespaces

Created attachment 1479709 [details]
File: open_fds

It looks like that the problem is in plugin imgbased where it called self.read_config(self.PLUGIN_CONF) with string argument but it requires dnf.conf.

Which version are you using ? this was fixed a long time ago in [1]

[1] https://gerrit.ovirt.org/#/c/87626/6/src/plugin-dnf/imgbased-persist.py

(In reply to Yuval Turgeman from comment #11)
> Which version are you using ? this was fixed a long time ago in [1]
> 
> [1] https://gerrit.ovirt.org/#/c/87626/6/src/plugin-dnf/imgbased-persist.py

- imgbased Version:
imgbased-1.0.999-0.1.fc28.2.noarch

As per above patch, I have edited file `/usr/lib/python3.6/site-packages/dnf-plugins/imgbased-persist.py`

~~~
import logging
import os
import shutil

import dnf

logger = logging.getLogger('dnf.plugin')
logger.setLevel(logging.INFO)


class ImgbasedPersist(dnf.Plugin):

    name = 'imagebased-persist'
    config_name = 'imgbased-persist'
    persist_path = "/tmp/persisted-rpms/"

    excluded_pkgs = []

    def __init__(self, base, cli):
        super(ImgbasedPersist, self).__init__(base, cli)
        self.base = base

        cp = self.read_config(self.base.conf)
        self.excluded_pkgs = cp.get("main", "exclude_pkgs").split(',')

    def check_excludes(self, name):
        if name in self.excluded_pkgs:
            return True
        return False

    def transaction(self):
        if self.base.transaction.install_set:
            if not os.path.isdir(self.persist_path):
                os.makedirs(self.persist_path)

            for p in self.base.transaction.install_set:
                if self.check_excludes(p.name):
                    continue
                rpm = p.localPkg()
                logger.info("Persisting: %s" % os.path.basename(rpm))
                shutil.copy2(rpm, self.persist_path + os.path.basename(rpm))

        if self.base.transaction.remove_set:
            for p in self.base.transaction.remove_set:
                rpm = "{}-{}-{}.{}.rpm".format(p.name, p.v, p.r, p.a)
                try:
                    logger.info("Unpersisting: %s" % rpm)
                    os.remove(self.persist_path + rpm)
                except:
                    # Has probably never been persisted. Manual RPM install?
                    pass

~~~


Now `ERROR` has changed.
~~~
# dnf  update
Traceback (most recent call last):
  File "/usr/bin/dnf", line 58, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 179, in user_main
    errcode = main(args)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 64, in main
    return _main(base, args, cli_class, option_parser_class)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 95, in _main
    cli.configure(list(map(ucd, args)), option_parser())
  File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 843, in configure
    self.base.init_plugins(opts.disableplugin, opts.enableplugin, self)
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 388, in init_plugins
    self._plugins._run_init(self, cli)
  File "/usr/lib/python3.6/site-packages/dnf/plugin.py", line 133, in _run_init
    plugin = p_cls(base, cli)
  File "/usr/lib/python3.6/site-packages/dnf-plugins/imgbased-persist.py", line 43, in __init__
    self.excluded_pkgs = cp.get("main", "exclude_pkgs").split(',')
  File "/usr/lib/python3.6/site-packages/iniparse/compat.py", line 219, in get
    raise NoSectionError(section)
configparser.NoSectionError: No section: 'main'
~~~

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