2) from the provided log it seems that your local copy doesn't contain mos-holdback, this might be caused by the bug which is not fixed yet in 8.0 (https://review.openstack.org/#/c/290525/). If this is the case you have to patch the fuel-mirror manually with the mentioned patch.
If you fix these, you don't need systemd-shim to be installed, it should work as is w/o any workarounds.
Charles, I see 2 problems in your output:
1) the definition of the mos-holdback repo in your settings is wrong, please find the correct definition in https:/ /content. mirantis. com/rs/ 451-RBY- 185/images/ Mirantis- Technical- Bulletin- 33-systemd. pdf
2) from the provided log it seems that your local copy doesn't contain mos-holdback, this might be caused by the bug which is not fixed yet in 8.0 (https:/ /review. openstack. org/#/c/ 290525/). If this is the case you have to patch the fuel-mirror manually with the mentioned patch.
If you fix these, you don't need systemd-shim to be installed, it should work as is w/o any workarounds.