$ git clone -n https://src.fedoraproject.org/rpms/jackson-bom.git /var/lib/mock/f42-build-3406883-45143/root/chroot_tmpdir/scmroot/jackson-bom
Cloning into '/var/lib/mock/f42-build-3406883-45143/root/chroot_tmpdir/scmroot/jackson-bom'...
$ git fetch origin 81a1301422c2f075792576544fbcdcf9746bc300:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-bom
 * [new ref]         81a1301422c2f075792576544fbcdcf9746bc300 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81a1301 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild