$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk4-x11-sys.git /var/lib/mock/f40-build-2712833-72081/root/chroot_tmpdir/scmroot/rust-gdk4-x11-sys
Cloning into '/var/lib/mock/f40-build-2712833-72081/root/chroot_tmpdir/scmroot/rust-gdk4-x11-sys'...
$ git fetch origin 517aebbf369af1b5dfc78a1c54881899bae34a90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk4-x11-sys
 * [new ref]         517aebbf369af1b5dfc78a1c54881899bae34a90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 517aebb Update to version 0.8.1; Fixes RHBZ#2262617