$ git clone -n https://src.fedoraproject.org/rpms/rust-tokei.git /var/lib/mock/f41-build-861632-169925/root/chroot_tmpdir/scmroot/rust-tokei
Cloning into '/var/lib/mock/f41-build-861632-169925/root/chroot_tmpdir/scmroot/rust-tokei'...
$ git fetch origin cbf7cb83f2d22029d266cdfd37ec39b2def1743c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokei
 * [new ref]         cbf7cb83f2d22029d266cdfd37ec39b2def1743c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbf7cb8 Bump git2 dependency from 0.18 to 0.19