$ git clone -n https://src.fedoraproject.org/rpms/rust-hybrid-array.git /var/lib/mock/f45-build-42466-794/root/chroot_tmpdir/scmroot/rust-hybrid-array
Cloning into '/var/lib/mock/f45-build-42466-794/root/chroot_tmpdir/scmroot/rust-hybrid-array'...
$ git fetch origin 615e38dc3caff8b6ea9b0313298c70481046e7d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hybrid-array
 * [new ref]         615e38dc3caff8b6ea9b0313298c70481046e7d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 615e38d Update to version 0.4.15; Fixes RHBZ#2530089