$ git clone -n https://src.fedoraproject.org/rpms/rust-aead.git /var/lib/mock/f45-build-40030-767/root/chroot_tmpdir/scmroot/rust-aead
Cloning into '/var/lib/mock/f45-build-40030-767/root/chroot_tmpdir/scmroot/rust-aead'...
$ git fetch origin 15e459f6bf313d3081aec9715341069a8cd5dd9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-aead
 * [new ref]         15e459f6bf313d3081aec9715341069a8cd5dd9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15e459f Update to version 0.6.1; Fixes RHBZ#2486529