How to pass the IP address of the Droplet when provisioning it with Python?

[KelSolaar]

Hello,

I'm trying to understand how can I pass the IP address of the Droplet when provisioning it with Python:

        droplet = Droplet(
            self,
            "droplet",
            name="my-droplet",
            image="ubuntu-22-04-x64",
            region="lon1",
            size="s-1vcpu-1gb",
            ssh_keys=[ssh_key.fingerprint],
            connection={
                "host": droplet_ipv4_address, # <-- ?
                "user": "root",
                "type": "ssh",
                "agent": True,
                "timeout": "2m",
            },
            provisioners=[
                {"type": "remote-exec", "script": str(PATH_PROVISION_DROPLET)}
            ],
        )

Cheers,

Thomas

[KelSolaar]

I tried to create a separate resource:

        Resource(
            self,
            "resource",
            depends_on=[droplet],
            connection={
                "host": droplet.ipv4_address,
                "port": 22,
                "private_key": os.environ.get("DIGITALOCEAN_PRIVATE_KEY_PATH"),
                "user": "root",
                "type": "ssh",
                "agent": False,
                "timeout": "15s",
            },
            provisioners=[
                {
                    "type": "file",
                    "source": str(PATH_PROVISION_DROPLET),
                    "destination": path_provision_droplet,
                },
                {
                    "type": "remote-exec",
                    "script": path_provision_droplet,
                },
            ],
        )

and the provision fails with a SSH error:

                      │ Error: file provisioner error
                      │
                      │   with null_resource.resource (resource),
                      │   on cdk.tf.json line 106, in resource.null_resource.resource (resource).provisioner[0].file:
                      │  106:             }
                      │
                      │ timeout - last error: SSH authentication failed ...:
                      │ ssh: handshake failed: ssh: unable to authenticate, attempted methods
                      │ [none], no supported methods remain

which is kind of expected given that the private_key does not seem to be passed:

   "null_resource": {
      "resource": {
        "//": {
          "metadata": {
            "path": "stack/resource",
            "uniqueId": "resource"
          }
        },
        "connection": {
          "host": "${digitalocean_droplet.droplet.ipv4_address}",
          "port": 22,
          "timeout": "15s",
          "type": "ssh",
          "user": "root"
        },
        "depends_on": [
          "digitalocean_droplet.droplet"
        ],
        "provisioner": [
          {
            "file": {
              "destination": "/var/tmp/bootstrap-droplet.sh",
              "source": ".../bootstrap-droplet.sh"
            }
          },
          {
            "remote-exec": {
              "script": "/var/tmp/bootstrap-droplet.sh"
            }
          }
        ]
      }
    }

Is this expected?