$ git clone -n https://src.fedoraproject.org/rpms/rust-gio.git /var/lib/mock/f42-build-side-1-3585180-46903/root/chroot_tmpdir/scmroot/rust-gio
Cloning into '/var/lib/mock/f42-build-side-1-3585180-46903/root/chroot_tmpdir/scmroot/rust-gio'...
$ git fetch origin c26dd40186c152a2fb831f30e90c8caa26102bf1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gio
 * [new ref]         c26dd40186c152a2fb831f30e90c8caa26102bf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c26dd40 Update to version 0.20.12