How to use the hacking.core.GlobalCheck function in hacking

#       http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#  License for the specific language governing permissions and limitations
#  under the License.

import os
import re
import subprocess

from hacking import core


class GitCheck(core.GlobalCheck):
    """Base-class for Git related checks."""

    def _get_commit_title(self):
        # Check if we're inside a git checkout
        try:
            subp = subprocess.Popen(
                ['git', 'rev-parse', '--show-toplevel'],
                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            gitdir = subp.communicate()[0].rstrip()
        except OSError:
            # "git" was not found
            return None

        if not os.path.exists(gitdir):
            return None

#       http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#  License for the specific language governing permissions and limitations
#  under the License.

import os
import re
import subprocess  # nosec

from hacking import core


class GitCheck(core.GlobalCheck):
    """Base-class for Git related checks."""

    def _get_commit_title(self):
        # Check if we're inside a git checkout
        try:
            subp = subprocess.Popen(  # nosec
                ['git', 'rev-parse', '--show-toplevel'],
                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            gitdir = subp.communicate()[0].rstrip()
        except OSError:
            # "git" was not found
            return None

        if not os.path.exists(gitdir):
            return None