$ git clone -n https://src.fedoraproject.org/rpms/tkrzw.git /var/lib/mock/f40-build-1943470-25169/root/chroot_tmpdir/scmroot/tkrzw
Cloning into '/var/lib/mock/f40-build-1943470-25169/root/chroot_tmpdir/scmroot/tkrzw'...
$ git fetch origin c4fda0a0b90cc220d5f4a120ff34e90e6c303e70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tkrzw
 * [new ref]         c4fda0a0b90cc220d5f4a120ff34e90e6c303e70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4fda0a Version bump