teslur commented on issue #35171:
URL: https://github.com/apache/airflow/issues/35171#issuecomment-1792846247
Hello there! I deeply appreciate your insightful feedback.
> Your fix appends this list and there might be a situation, when it
contains 2 dicts with key-value pair (key and ssh-keys pair), so is it
acceptable for gce?
It seems you're considering a situation where a `"ssh-keys"` metadata may
already exist in the GCE instance as illustrated below:
```python
metadata = instance_info["metadata"] #=> { "items": [{ "key": "ssh-keys",
"value": "some-ssh-key" }] }
```
From my understanding, it appears that duplicates of `"ssh-keys"` within
`"items"`, as you've pointed out, would not occur.
This situation is managed by the existing `for ~ if` block, not the part of
the code I have altered.
Per [the Python language specification, the `else` block isn't executed if
the `break` statement is
run](https://docs.python.org/3/reference/compound_stmts.html#the-for-statement).
If there are any inaccuracies in my understanding, I would greatly
appreciate your guidance.
```python
keys = self.user + ":" + pubkey + "\n"
metadata = instance_info["metadata"]
items = metadata.get("items", [])
for item in items:
if item.get("key") == "ssh-keys": #=> In this case the metadata
is processed here.
keys += item["value"]
item["value"] = keys
break #=> This break prevents the else block from being
processed.
else:
new_dict = {"key": "ssh-keys", "value": keys}
metadata["items"] = [*items, new_dict] #=> I made changes to
this line.
```
The intended outcome for the metadata structure should be:
```python
metadata #=> { "items": [{ "key": "ssh-keys", "value":
"new-key\nsome-ssh-key" }] }
```
This is in line with the [`setMetadata` API requirements of
GCE](https://cloud.google.com/compute/docs/connect/add-ssh-keys#after-vm-creation).
The modifications I made would only be implemented if a dict with the key
"ssh-keys" is not present in the original metadata.
Importantly, my changes are not expected to result in the metadata having
multiple dicts with the same key "ssh-keys" coexist in `"items"`.
Best regards.
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