$ git clone -n https://src.fedoraproject.org/rpms/rust-downcast-rs1.git /var/lib/mock/f45-build-41380-782/root/chroot_tmpdir/scmroot/rust-downcast-rs1
Cloning into '/var/lib/mock/f45-build-41380-782/root/chroot_tmpdir/scmroot/rust-downcast-rs1'...
$ git fetch origin 11010d463042f72f4d84106d9ff4c0a4d44e6a71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-downcast-rs1
 * [new ref]         11010d463042f72f4d84106d9ff4c0a4d44e6a71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11010d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild