$ git clone -n https://src.fedoraproject.org/rpms/rust-http-content-range.git /var/lib/mock/f42-build-side-1-3534287-46548/root/chroot_tmpdir/scmroot/rust-http-content-range
Cloning into '/var/lib/mock/f42-build-side-1-3534287-46548/root/chroot_tmpdir/scmroot/rust-http-content-range'...
$ git fetch origin 02098a6c99648927926c7b4380d29ed46a6dc3c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-http-content-range
 * [new ref]         02098a6c99648927926c7b4380d29ed46a6dc3c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02098a6 Update to 0.2.3 (close RHBZ#2370984)