$ git clone -n https://src.fedoraproject.org/rpms/rust-cbc.git /var/lib/mock/f40-build-2652175-66891/root/chroot_tmpdir/scmroot/rust-cbc
Cloning into '/var/lib/mock/f40-build-2652175-66891/root/chroot_tmpdir/scmroot/rust-cbc'...
$ git fetch origin b450aeae4c5bbd0ea9144d27f11666131ea896d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cbc
 * [new ref]         b450aeae4c5bbd0ea9144d27f11666131ea896d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b450aea Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild