$ git clone -n https://src.fedoraproject.org/rpms/rust-rio.git /var/lib/mock/f45-build-44409-813/root/chroot_tmpdir/scmroot/rust-rio
Cloning into '/var/lib/mock/f45-build-44409-813/root/chroot_tmpdir/scmroot/rust-rio'...
$ git fetch origin b0adbf451a8a08bb386fd51dffee10844ec0e3b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rio
 * [new ref]         b0adbf451a8a08bb386fd51dffee10844ec0e3b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0adbf4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild