$ git clone -n https://src.fedoraproject.org/rpms/rust-rustsec.git /var/lib/mock/f41-build-789885-13607/root/chroot_tmpdir/scmroot/rust-rustsec
Cloning into '/var/lib/mock/f41-build-789885-13607/root/chroot_tmpdir/scmroot/rust-rustsec'...
$ git fetch origin 98b19121e7867cb3217ce9ad823b99d81b7cd3f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustsec
 * [new ref]         98b19121e7867cb3217ce9ad823b99d81b7cd3f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98b1912 Update to version 0.29.1; Fixes RHBZ#2250317