$ git clone -n https://src.fedoraproject.org/rpms/jakarta-saaj.git /var/lib/mock/f40-build-2446545-61304/root/chroot_tmpdir/scmroot/jakarta-saaj
Cloning into '/var/lib/mock/f40-build-2446545-61304/root/chroot_tmpdir/scmroot/jakarta-saaj'...
$ git fetch origin 5b940d4872d7b64406fceae2e63e235a7350921b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-saaj
 * [new ref]         5b940d4872d7b64406fceae2e63e235a7350921b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b940d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild