$ git clone -n https://src.fedoraproject.org/rpms/jakarta-saaj.git /var/lib/mock/f40-build-2172045-51046/root/chroot_tmpdir/scmroot/jakarta-saaj
Cloning into '/var/lib/mock/f40-build-2172045-51046/root/chroot_tmpdir/scmroot/jakarta-saaj'...
$ git fetch origin f9e423b097702f4c6abce87b867eff7e42f7dd31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-saaj
 * [new ref]         f9e423b097702f4c6abce87b867eff7e42f7dd31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9e423b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild