$ git clone -n https://git.cclinux.org/stage/rpms/rt-setup.git /var/lib/mock/dist-circle8-build-108921-60255/root/chroot_tmpdir/scmroot/rt-setup
Cloning into '/var/lib/mock/dist-circle8-build-108921-60255/root/chroot_tmpdir/scmroot/rt-setup'...
$ git fetch origin 3e90a6d41d208992aa349a750a0a2e3176ccc957:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/rt-setup
 * [new ref]         3e90a6d41d208992aa349a750a0a2e3176ccc957 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e90a6d import rt-setup-2.1-5.el8