$ git clone -n https://src.fedoraproject.org/rpms/rust-shake.git /var/lib/mock/f45-build-44916-819/root/chroot_tmpdir/scmroot/rust-shake
Cloning into '/var/lib/mock/f45-build-44916-819/root/chroot_tmpdir/scmroot/rust-shake'...
$ git fetch origin 49e44094792674e4f7da8098b6b13e3e710b7806:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-shake
 * [new ref]         49e44094792674e4f7da8098b6b13e3e710b7806 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49e4409 Initial package (close RHBZ#2498042)