$ git clone -n https://src.fedoraproject.org/rpms/rust-chunked_transfer.git /var/lib/mock/f45-build-40793-776/root/chroot_tmpdir/scmroot/rust-chunked_transfer
Cloning into '/var/lib/mock/f45-build-40793-776/root/chroot_tmpdir/scmroot/rust-chunked_transfer'...
$ git fetch origin 1a300a2bc1f2f8577ee0f7366fe6c31daf9976d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-chunked_transfer
 * [new ref]         1a300a2bc1f2f8577ee0f7366fe6c31daf9976d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a300a2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild