$ git clone -n https://src.fedoraproject.org/rpms/rust-vsock.git /var/lib/mock/f45-build-46093-830/root/chroot_tmpdir/scmroot/rust-vsock
Cloning into '/var/lib/mock/f45-build-46093-830/root/chroot_tmpdir/scmroot/rust-vsock'...
$ git fetch origin 823e132a052024d8f5951a71a7fcb1dbe3652e36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vsock
 * [new ref]         823e132a052024d8f5951a71a7fcb1dbe3652e36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 823e132 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild