$ git clone -n https://src.fedoraproject.org/rpms/rust-generic-array.git /var/lib/mock/f39-build-1521674-35854/root/chroot_tmpdir/scmroot/rust-generic-array
Cloning into '/var/lib/mock/f39-build-1521674-35854/root/chroot_tmpdir/scmroot/rust-generic-array'...
$ git fetch origin 7c0d511fdb48328802a8a6974aad3c4d637c6032:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-generic-array
 * [new ref]         7c0d511fdb48328802a8a6974aad3c4d637c6032 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c0d511 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild