$ git clone -n https://src.fedoraproject.org/rpms/rust-clap_derive.git /var/lib/mock/f42-build-side-1-3583202-46888/root/chroot_tmpdir/scmroot/rust-clap_derive
Cloning into '/var/lib/mock/f42-build-side-1-3583202-46888/root/chroot_tmpdir/scmroot/rust-clap_derive'...
$ git fetch origin c948a475e8cd5fc956a00db4ef8cec8278ef9c4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-clap_derive
 * [new ref]         c948a475e8cd5fc956a00db4ef8cec8278ef9c4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c948a47 Update to version 4.5.40; Fixes RHBZ#2371281