$ git clone -n https://github.com/xcp-ng-rpms/createrepo_c.git /var/lib/mock/v8.3-u-pcoval2-10600-29155/root/chroot_tmpdir/scmroot/createrepo_c
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10600-29155/root/chroot_tmpdir/scmroot/createrepo_c'...
$ git fetch origin 00d66c971be716704cd7922cdb97c773cb143664:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/createrepo_c
 * [new ref]         00d66c971be716704cd7922cdb97c773cb143664 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00d66c9 bump release for test build