Description of problem:
Grafana does not start and reports several permissions issues.

Version-Release number of selected component (if applicable):
grafana-6.7.3-1.el8

How reproducible:
Always

Steps to Reproduce:
1. On a fresh RHEL-8.3 compose install grafana server
# yum install -y grafana
2. Set the admin password from command line before the very first start of grafana server
# grafana-cli admin reset-admin-password superSeCrEtPsWD
3. Start the grafana-server servis
# systemctl start grafana-server

Actual results:
The output of the "systemctl start grafana-server" is as follows:

# systemctl restart grafana-server
Job for grafana-server.service failed because the control process exited with error code.
See "systemctl status grafana-server.service" and "journalctl -xe" for details.
# systemctl status -l grafana-server.service
● grafana-server.service - Grafana instance
Loaded: loaded (/usr/lib/systemd/system/grafana-server.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Tue 2020-06-02 13:29:50 EDT; 39s ago
Docs: http://docs.grafana.org
Process: 35021 ExecStart=/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=rpm cfg:default.paths.logs=${LOG_DIR} cfg:default.paths.data=${DATA_DIR} cfg:default.paths.plugins=${PLUGINS_DIR} cfg:default.paths.provisioning=${PROVISIONING_CFG_DIR} (code=exited, status=1/FAILURE)
Main PID: 35021 (code=exited, status=1/FAILURE)

Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Main process exited, code=exited, status=1/FAILURE
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Failed with result 'exit-code'.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: Failed to startGrafana instance.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Service RestartSec=100ms expired, scheduling restart.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Scheduled restart job, restart counter is at 5.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: Stopped Grafanainstance.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Start request repeated too quickly.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: grafana-server.service: Failed with result 'exit-code'.
Jun 02 13:29:50 ci-vm-10-0-137-55.hosted.upshift.rdu2.redhat.com systemd[1]: Failed to startGrafana instance.

Expected results:
Grafana server starts without any issue

Additional info:
Digging a bit deeper and starting the Grafana manually (instead of using systemd) it reviles issues with permissions of several directories:

# . /etc/sysconfig/grafana-server
# cd ${GRAFANA_HOME}
# su -c "/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=rpm cfg:default.paths.logs=${LOG_DIR} cfg:default.paths.data=${DATA_DIR} cfg:default.paths.plugins=${PLUGINS_DIR} cfg:default.paths.provisioning=${PROVISIONING_CFG_DIR}" -s /bin/bash grafana -

Failed to start grafana. error: failed to initialize file handler: open /var/log/grafana/grafana.log: permission denied
# chown grafana:grafana /var/log/grafana/grafana.log
# su -c "/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=rpm cfg:default.paths.logs=${LOG_DIR} cfg:default.paths.data=${DATA_DIR} cfg:default.paths.plugins=${PLUGINS_DIR} cfg:default.paths.provisioning=${PROVISIONING_CFG_DIR}" -s /bin/bash grafana -
...
EROR[06-02|13:37:14] Failed to verify pid directory           logger=server error="mkdir /var/run/grafana: permission denied"
# mkdir /var/run/grafana
# chown grafana:grafana /var/run/grafana
# su -c "/usr/sbin/grafana-server --config=${CONF_FILE} --pidfile=${PID_FILE_DIR}/grafana-server.pid --packaging=rpm cfg:default.paths.logs=${LOG_DIR} cfg:default.paths.data=${DATA_DIR} cfg:default.paths.plugins=${PLUGINS_DIR} cfg:default.paths.provisioning=${PROVISIONING_CFG_DIR}" -s /bin/bash grafana -
...
EROR[06-02|13:12:16] Problem reading image dir                logger=cleanup error="open /var/lib/grafana/png: permission denied"
# mkdir /var/lib/grafana/png
# chown grafana:grafana /var/lib/grafana/png


To sum up: running the following set of commands before the very first run of grafana-server fixes the issue. IMO these files/directories need to have the correct permissions and ownership before grafana-server starts - as such it should be part of grafana SPEC file (%post):
# chown grafana:grafana /var/log/grafana/grafana.log
# mkdir /var/run/grafana
# chown grafana:grafana /var/run/grafana
# mkdir /var/lib/grafana/png
# chown grafana:grafana /var/lib/grafana/png