$ git clone -n https://src.fedoraproject.org/rpms/postgrey.git /var/lib/mock/f39-build-1531789-36215/root/chroot_tmpdir/scmroot/postgrey
Cloning into '/var/lib/mock/f39-build-1531789-36215/root/chroot_tmpdir/scmroot/postgrey'...
$ git fetch origin e076139656f74d42f96aa312130f11c1fed16ac3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postgrey
 * [new ref]         e076139656f74d42f96aa312130f11c1fed16ac3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e076139 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild