$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/eln-build-side-110480-59000337-6570139/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/eln-build-side-110480-59000337-6570139/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin 5764a727c41f671d5f17eed7f90ef12f29b81622:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         5764a727c41f671d5f17eed7f90ef12f29b81622 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5764a72 1.37.38