$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk4-sys.git /var/lib/mock/f40-build-2150141-50894/root/chroot_tmpdir/scmroot/rust-gdk4-sys
Cloning into '/var/lib/mock/f40-build-2150141-50894/root/chroot_tmpdir/scmroot/rust-gdk4-sys'...
$ git fetch origin 9aa1dff59d7ba1d2519b3525ab5ad97a9145c1d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk4-sys
 * [new ref]         9aa1dff59d7ba1d2519b3525ab5ad97a9145c1d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9aa1dff Update to version 0.7.2; Fixes RHBZ#2231638