$ git clone -n https://src.fedoraproject.org/rpms/rust-gobject-sys0.17.git /var/lib/mock/f38-build-side-43-rust-devel-1421909-31465/root/chroot_tmpdir/scmroot/rust-gobject-sys0.17
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1421909-31465/root/chroot_tmpdir/scmroot/rust-gobject-sys0.17'...
$ git fetch origin af8a08e120c0670288697f73ff900aac964f028a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gobject-sys0.17
 * [new ref]         af8a08e120c0670288697f73ff900aac964f028a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af8a08e Initial import (gobject-sys 0.17 compat package)