$ git clone -n https://src.fedoraproject.org/rpms/libtpcimgio.git /var/lib/mock/f45-build-17146-496/root/chroot_tmpdir/scmroot/libtpcimgio
Cloning into '/var/lib/mock/f45-build-17146-496/root/chroot_tmpdir/scmroot/libtpcimgio'...
$ git fetch origin b777ff2c29de07a9ad8cd1b85e33456c7d982cb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtpcimgio
 * [new ref]         b777ff2c29de07a9ad8cd1b85e33456c7d982cb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b777ff2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild