$ git clone -n https://src.fedoraproject.org/rpms/rust-async-task.git /var/lib/mock/f45-build-40293-770/root/chroot_tmpdir/scmroot/rust-async-task
Cloning into '/var/lib/mock/f45-build-40293-770/root/chroot_tmpdir/scmroot/rust-async-task'...
$ git fetch origin 983a93b1200be32ac88088e70b87ee1bbba9a9a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-task
 * [new ref]         983a93b1200be32ac88088e70b87ee1bbba9a9a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 983a93b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild