$ git clone -n https://src.fedoraproject.org/rpms/jakarta-activation.git /var/lib/mock/f41-build-1273216-23132/root/chroot_tmpdir/scmroot/jakarta-activation
Cloning into '/var/lib/mock/f41-build-1273216-23132/root/chroot_tmpdir/scmroot/jakarta-activation'...
$ git fetch origin 83d5a9d96ec5c2f3c5b873c3ead64e71aba8de9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jakarta-activation
 * [new ref]         83d5a9d96ec5c2f3c5b873c3ead64e71aba8de9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d5a9d Update to upstream version 2.1.3