$ git clone -n https://src.fedoraproject.org/rpms/rust-av1-grain.git /var/lib/mock/f40-build-2652231-66891/root/chroot_tmpdir/scmroot/rust-av1-grain
Cloning into '/var/lib/mock/f40-build-2652231-66891/root/chroot_tmpdir/scmroot/rust-av1-grain'...
$ git fetch origin f340d16eb520b249a9c3e67210d15489c29c2891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-av1-grain
 * [new ref]         f340d16eb520b249a9c3e67210d15489c29c2891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f340d16 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild