$ git clone -n https://src.fedoraproject.org/rpms/rust-gobject-sys.git /var/lib/mock/f38-build-side-42-init-devel-1393582-31050/root/chroot_tmpdir/scmroot/rust-gobject-sys
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1393582-31050/root/chroot_tmpdir/scmroot/rust-gobject-sys'...
$ git fetch origin ddbd86b4390a2b93662bffd0c4ccc425278d3fe0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gobject-sys
 * [new ref]         ddbd86b4390a2b93662bffd0c4ccc425278d3fe0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ddbd86b Update to version 0.18.0; Fixes RHBZ#2224911