$ git clone -n https://src.fedoraproject.org/rpms/rust-gobject-sys.git /var/lib/mock/f39-build-1561776-37408/root/chroot_tmpdir/scmroot/rust-gobject-sys
Cloning into '/var/lib/mock/f39-build-1561776-37408/root/chroot_tmpdir/scmroot/rust-gobject-sys'...
$ git fetch origin d0614c96a0014bb0436b802e65e77fc57c05a59f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gobject-sys
 * [new ref]         d0614c96a0014bb0436b802e65e77fc57c05a59f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0614c9 Update to version 0.18.0; Fixes RHBZ#2224911