$ git clone -n https://src.fedoraproject.org/rpms/rust-gtk4-sys0.8.git /var/lib/mock/f42-build-side-1-3589314-46957/root/chroot_tmpdir/scmroot/rust-gtk4-sys0.8
Cloning into '/var/lib/mock/f42-build-side-1-3589314-46957/root/chroot_tmpdir/scmroot/rust-gtk4-sys0.8'...
$ git fetch origin db4670ccacf48103a387bb9a968cf0aac7b1b756:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gtk4-sys0.8
 * [new ref]         db4670ccacf48103a387bb9a968cf0aac7b1b756 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db4670c compat package no longer needed