$ git clone -n https://src.fedoraproject.org/rpms/rust-epoll.git /var/lib/mock/f39-build-1938294-43141/root/chroot_tmpdir/scmroot/rust-epoll
Cloning into '/var/lib/mock/f39-build-1938294-43141/root/chroot_tmpdir/scmroot/rust-epoll'...
$ git fetch origin ccfc9bdc8622d8f5343f59c426e55014377c9ef8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-epoll
 * [new ref]         ccfc9bdc8622d8f5343f59c426e55014377c9ef8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ccfc9bd Unretirement request: https://pagure.io/releng/issue/11731