$ git clone -n https://src.fedoraproject.org/rpms/libchamplain.git /var/lib/mock/f45-build-15990-481/root/chroot_tmpdir/scmroot/libchamplain
Cloning into '/var/lib/mock/f45-build-15990-481/root/chroot_tmpdir/scmroot/libchamplain'...
$ git fetch origin 8f9a2a5b4c777aa4abb612205fc39f834c433bfd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libchamplain
 * [new ref]         8f9a2a5b4c777aa4abb612205fc39f834c433bfd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f9a2a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild