Move the old metadata-service datasource to url datasource. This new datasource
checks for the existance of meta-data.json and if it doesn't exist, walks the
meta-data directory to build a metadata blob.
Supports retries with exponential backoff as well as connection
timeouts and the ability to skip SSL/TLS verification.
This commit also refactors datasource and initialize packages
in order to use the new HTTP client.
- Adds URL validations
- Adds timeout support for http client
- Limits the amount of retries to not spin forever
- Fails faster if response status code is 4xx
- Does a little bit more of logging
- Adds more tests
The user-cloudinit-proc-cmdline systemd unit is responsible for
fetching user-data from various sources during the cloud-init
process. When fetching user-data from an URL datasource we face
a race condition since the network may not be available, which
can cause the job to fail and no further attempts to fetch the
user-data are made.
Eliminate the race condition when fetching user-data from an URL
datasource. Retry the fetch using an exponential backoff until
the user-data is retrieved.
Fixes issue 105.
