$ git clone -n https://src.fedoraproject.org/rpms/fbgemm.git /var/lib/mock/f42-build-3273251-41310/root/chroot_tmpdir/scmroot/fbgemm
Cloning into '/var/lib/mock/f42-build-3273251-41310/root/chroot_tmpdir/scmroot/fbgemm'...
$ git fetch origin ae8516caefb8a84e3033e7d6434eb9e841204b67:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbgemm
 * [new ref]         ae8516caefb8a84e3033e7d6434eb9e841204b67 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae8516c Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild