$ git clone -n https://src.fedoraproject.org/rpms/rust-syn1.git /var/lib/mock/f40-build-2656111-66913/root/chroot_tmpdir/scmroot/rust-syn1
Cloning into '/var/lib/mock/f40-build-2656111-66913/root/chroot_tmpdir/scmroot/rust-syn1'...
$ git fetch origin ec34538683c1741f8778a1540008e2be5c279a1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-syn1
 * [new ref]         ec34538683c1741f8778a1540008e2be5c279a1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec34538 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild