def main(ctx):
    which = "where" if sys.platform == "win32" else "which"
    if envoy.run(which + " git").status_code != 0:
        click.secho("fatal: git not found in PATH", fg="red")
        sys.exit(1)
    ctx.obj = Hydrogen()
def create_request(self, copy_id_photo_from=None):
        """
        Construct the HTTP request to the photo verification service.

        Keyword Arguments:
            copy_id_photo_from (SoftwareSecurePhotoVerification): If provided, re-send the ID photo
                data from this attempt.  This is used for reverification, in which new face photos
                are sent with previously-submitted ID photos.

        Returns:
            tuple of (header, body), where both `header` and `body` are dictionaries.

        """
        access_key = settings.VERIFY_STUDENT["SOFTWARE_SECURE"]["API_ACCESS_KEY"]
        secret_key = settings.VERIFY_STUDENT["SOFTWARE_SECURE"]["API_SECRET_KEY"]

        scheme = "https" if settings.HTTPS == "on" else "http"
        callback_url = "{}://{}{}".format(
            scheme, settings.SITE_NAME, reverse('verify_student_results_callback')
        )

        # If we're copying the photo ID image from a previous verification attempt,
        # then we need to send the old image data with the correct image key.
        photo_id_url = (
            self.image_url("photo_id")
            if copy_id_photo_from is None
            else self.image_url("photo_id", override_receipt_id=copy_id_photo_from.receipt_id)
        )

        photo_id_key = (
            self.photo_id_key
            if copy_id_photo_from is None else
            copy_id_photo_from.photo_id_key
        )

        body = {
            "EdX-ID": str(self.receipt_id),
            "ExpectedName": self.name,
            "PhotoID": photo_id_url,
            "PhotoIDKey": photo_id_key,
            "SendResponseTo": callback_url,
            "UserPhoto": self.image_url("face"),
            "UserPhotoKey": self._encrypted_user_photo_key_str(),
        }
        headers = {
            "Content-Type": "application/json",
            "Date": formatdate(timeval=None, localtime=False, usegmt=True)
        }
        _message, _sig, authorization = generate_signed_message(
            "POST", headers, body, access_key, secret_key
        )
        headers['Authorization'] = authorization

        return headers, body