$ git clone -n https://github.com/xcp-ng-rpms/krb5.git /var/lib/mock/v8.3-incoming-9410-28151/root/chroot_tmpdir/scmroot/krb5
Cloning into '/var/lib/mock/v8.3-incoming-9410-28151/root/chroot_tmpdir/scmroot/krb5'...
$ git fetch origin e7f083428558eef2b9dc3dc1bef602a4274521dc:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/krb5
 * [new ref]         e7f083428558eef2b9dc3dc1bef602a4274521dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7f0834 Import krb5-1.15.1-22.xs8.src.rpm