$ git clone -n https://src.fedoraproject.org/rpms/merkuro.git /var/lib/mock/f45-build-53099-918/root/chroot_tmpdir/scmroot/merkuro
Cloning into '/var/lib/mock/f45-build-53099-918/root/chroot_tmpdir/scmroot/merkuro'...
$ git fetch origin 946c0d879e38ef82efac6d8ddfb36753c290e3ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/merkuro
 * [new ref]         946c0d879e38ef82efac6d8ddfb36753c290e3ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 946c0d8 26.08.1