$ git clone -n https://src.fedoraproject.org/rpms/containers-common.git /var/lib/mock/f40-build-2217362-52547/root/chroot_tmpdir/scmroot/containers-common
Cloning into '/var/lib/mock/f40-build-2217362-52547/root/chroot_tmpdir/scmroot/containers-common'...
$ git fetch origin 2488e6c3e1f93d75fa346343aad325424225fa76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/containers-common
 * [new ref]         2488e6c3e1f93d75fa346343aad325424225fa76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2488e6c containers.conf changes are common so far for all fedoras