$ git clone -n https://src.fedoraproject.org/rpms/tcl-tclreadline.git /var/lib/mock/f42-build-868630-176219/root/chroot_tmpdir/scmroot/tcl-tclreadline
Cloning into '/var/lib/mock/f42-build-868630-176219/root/chroot_tmpdir/scmroot/tcl-tclreadline'...
$ git fetch origin 0152a7c591220a744d616c4ccee17e35e2575129:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-tclreadline
 * [new ref]         0152a7c591220a744d616c4ccee17e35e2575129 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0152a7c Rebuilt for tcl/tk