$ git clone -n https://src.fedoraproject.org/rpms/libssh2.git /var/lib/mock/f45-build-17044-495/root/chroot_tmpdir/scmroot/libssh2
Cloning into '/var/lib/mock/f45-build-17044-495/root/chroot_tmpdir/scmroot/libssh2'...
$ git fetch origin f34edd610c7701eb7958c0440d028a8070bd043a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libssh2
 * [new ref]         f34edd610c7701eb7958c0440d028a8070bd043a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f34edd6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild