$ git clone -n https://src.fedoraproject.org/rpms/rust-gio-sys.git /var/lib/mock/f39-build-1470330-33888/root/chroot_tmpdir/scmroot/rust-gio-sys
Cloning into '/var/lib/mock/f39-build-1470330-33888/root/chroot_tmpdir/scmroot/rust-gio-sys'...
$ git fetch origin 98299a79a1c471b2d1e70002e1744d415920431e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gio-sys
 * [new ref]         98299a79a1c471b2d1e70002e1744d415920431e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98299a7 Update to version 0.18.1; Fixes RHBZ#2224907