$ git clone -n https://src.fedoraproject.org/rpms/jakarta-saaj.git /var/lib/mock/f38-build-side-42-init-devel-636190-26382/root/chroot_tmpdir/scmroot/jakarta-saaj
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-636190-26382/root/chroot_tmpdir/scmroot/jakarta-saaj'...
$ git fetch origin 0b9a7c2b6e7b8c85c5ab7289d213edacb70e4d11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-saaj
 * [new ref]         0b9a7c2b6e7b8c85c5ab7289d213edacb70e4d11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b9a7c2 New upstream release 3.0.0