How to reproduce:
$ snapcraft create-key just-a-throwaway-key-i-will-never-use
...
$ snapcraft register-key just-a-throwaway-key-i-will-never-use
Registering key ...
Done. The key "just-a-throwaway-key-i-will-never-use" (19_X-nPQpWtxr40cSKtVgE2u-k9mpQQ7a6UjRPtX9VEoxg7TWVAEcuXLIMKiN6_X) may be used to sign your assertions.
(this creates an assertion for the key)
$ SNAPCRAFT_ENABLE_DEVELOPER_DEBUG=yes snapcraft register-key just-a-throwaway-key-i-will-never-use
Registering key ...
Enter your Ubuntu One e-mail address and password.
If you do not have an Ubuntu One account, you can create one at https://snapcraft.io/account
Email: (blahblahblah)
Password:
Calling https://dashboard.snapcraft.io/dev/api/acl/ with params None and headers {'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Accept': 'application/json'}
Calling https://login.ubuntu.com/api/v2/tokens/discharge with params None and headers {'Content-Type': 'application/json', 'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Accept': 'application/json'}
Second-factor auth: XXXXXXX
Calling https://dashboard.snapcraft.io/dev/api/acl/ with params None and headers {'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Accept': 'application/json'}
Calling https://login.ubuntu.com/api/v2/tokens/discharge with params None and headers {'Content-Type': 'application/json', 'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Accept': 'application/json'}
Calling https://dashboard.snapcraft.io/dev/api/account with params None and headers {'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Authorization': '<macaroon>', 'Accept': 'application/json'}
Calling https://dashboard.snapcraft.io/dev/api/account with params None and headers {'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Authorization': '<macaroon>', 'Accept': 'application/json'}
Registering key ...
Calling https://dashboard.snapcraft.io/dev/api/account with params None and headers {'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Authorization': '<macaroon>', 'Accept': 'application/json'}
Calling https://dashboard.snapcraft.io/dev/api/account/account-key with params None and headers {'Content-Type': 'application/json', 'User-Agent': 'snapcraft/3.8 Ubuntu/18.04 (amd64)', 'Authorization': '<macaroon>', 'Accept': 'application/json'}
Store error response: {'connection': <requests.adapters.HTTPAdapter object at 0x7fdbd96d7c18>, 'reason': 'Internal Server Error', 'raw': <urllib3.response.HTTPResponse object at 0x7fdbd9673da0>, '_next': None, 'elapsed': datetime.timedelta(0, 0, 378112), 'encoding': None, 'status_code': 500, 'url': 'https://dashboard.snapcraft.io/dev/api/account/account-key', '_content_consumed': True, '_content': b'{"error_list": [{"extra": {"assertion": "account-key-request"}, "code": "assertion-creation-failed", "message": "Failed to save account-key-request assertion for account_id Q8HSISyvcdrniz52oa8Qjh6HlZwv0wiT: invalid revision: could not add assertion (revision 0 is already the current revision)"}]}', 'request': <PreparedRequest [POST]>, 'headers': {'Content-Type': 'application/json', 'X-Cache': 'MISS from juju-4610b3-prod-mojo-ols-prod-scasnap-xenial-3', 'X-VCS-Revision': '38dc21a', 'Transfer-Encoding': 'chunked', 'Connection': 'close', 'Vary': 'Authorization,Accept-Language,Cookie', 'Date': 'Thu, 12 Sep 2019 19:45:17 GMT', 'Server': 'gunicorn/19.7.0', 'X-Request-Id': 'XXqgTH8AAQEAAHQMeV0AAABv1', 'Content-Language': 'en', 'X-View-Name': 'api-account-key', 'X-Cache-Lookup': 'MISS from juju-4610b3-prod-mojo-ols-prod-scasnap-xenial-3:3128', 'Strict-Transport-Security': 'max-age=2592000', 'ETag': '"bc78a45f5e3e273bcab4bc4e76956b48"', 'Via': '1.1 juju-4610b3-prod-mojo-ols-prod-scasnap-xenial-3 (squid/3.5.12)'}, 'history': [], 'cookies': <RequestsCookieJar[]>}
Sorry, an error occurred in Snapcraft:
The Snap Store encountered an error while processing your request: internal server error (code 500).
The operational status of the Snap Store can be checked at https://status.snapcraft.io/
Traceback (most recent call last):
File "/snap/snapcraft/3440/bin/snapcraft", line 11, in <module>
load_entry_point('snapcraft==3.8', 'console_scripts', 'snapcraft')()
File "/snap/snapcraft/3440/lib/python3.5/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/snap/snapcraft/3440/lib/python3.5/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/cli/assertions.py", line 74, in register_key
snapcraft.register_key(key_name)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/_store.py", line 414, in register_key
store.register_key(account_key_request)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_store_client.py", line 155, in register_key
return self._refresh_if_necessary(self.sca.register_key, account_key_request)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_store_client.py", line 109, in _refresh_if_necessary
return func(*args, **kwargs)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_sca_client.py", line 87, in register_key
"Accept": "application/json",
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_client.py", line 122, in post
return self.request("POST", url, **kwargs)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_sca_client.py", line 51, in request
response = super().request(*args, **kwargs)
File "/snap/snapcraft/3440/lib/python3.5/site-packages/snapcraft/storeapi/_client.py", line 98, in request
raise errors.StoreServerError(response)
snapcraft.storeapi.errors.StoreServerError: The Snap Store encountered an error while processing your request: internal server error (code 500).
The operational status of the Snap Store can be checked at https://status.snapcraft.io/
You can find the traceback in file '/tmp/tmpzyvvgjp_/trace.txt'.
Store-side, we bubble this as a 500. We could look into changing the result code into something snapcraft will show to the user in a more friendly manner; the problem here is that the existing key is already registered (the primary key for key assertions seems to be the key's sha384).
A workaround that totally sidesteps the issue is to create and register a different key; the best option, if the old key is still around, is to just use it to sign stuff, since it's already registered on the store.
Looks like this bug has been fixed:
tshinn@ubuntu-vm:~$ snapcraft register-key test-key
Enter your Ubuntu One e-mail address and password.
If you do not have an Ubuntu One account, you can create one at https:/
Email: <email address hidden>
Password:
Second-factor auth: xxxxxx
Registering key ...
Key registration failed: This account-key-request is already registered. This means that the account-key is likely already registered. If not then the solution might be to register a different key or to try sending a newer revision of the account-key-request for this key: invalid revision: could not add assertion (revision 0 is already the current revision)
tshinn@ubuntu-vm:~$
But the error message could be improved: "This account-key-request is already registered. This means that the account-key is likely already registered."