feat: enable support for single AP per SC #1
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Adding subPathPattern allows us to support more use cases than before because
now users can specify a template they wish to be created when the access
point is created. This template matches the form of the nfs-subdir-provioner
which aids consistency. This defaults to /${.PV.name} to be in keeping with
current behaviour but allows much more flexibility.
These functions allow us to take a pattern and turn it into a valid directory name. These can then be called in the method that builds up the directory name to be sent to the API.
Adds happy path testing for subPathPattern including whether it plays nicely with existing basePath parameter
Removing the 0-length check allows us to support not setting a basePath but having an empty pattern, as distinct from not setting subPathPattern, which means "/" can be used as a valid accessPoint path.
This ensures we can control when we want directories created under dynamic provisioning to be unique and when we don't (poweruser mode). This also adds some successful tests, next commit will add the failure cases to make sure all bases are covered.
Added a fix around the handling for misconfiguration of the ensureUniqueDirectory whereby if it's misconfigured it will fall through to its default value.
This has come up in several issues on the repo where people set basePath to `/` and this leads to problems. This proves this PR resolves that issue and doesn't lead to the problems of a path like `//`
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Is this a bug fix or adding new feature?
This PR is based on the work from @jonathanrainer in the PR kubernetes-sigs#640
What is this PR about? / Why do we need it?
The only change we did that fits our needs was add a new parameter to the storage class to allow the developer to specify a single AccessPoint that will be used through all the Volumes created by that StorageClass.
We suffer a lot with the 120 APs limitation, since we dynamically provision new resources based on user input or needs.
Also we don't run our workloads with root access, so we can't use the dir options also introduced in the PR kubernetes-sigs#732
Yes, we could create a static PV and use the PV across all the workloads, **and probably that's the best solution for most of the people), but giving the way we have our architecture, this wouldn't fit well.
What testing is done?
We are testing this yet, so far so good it seems to be working.
Probably this isn't the best option for the case, or something that most of the people will approve or thing as useful, but it fits our necessity.
We will think in a solution that we would that could fit most of the people that needs this, so far for us this makes sense, because each AP is limited to a UID/GID and you can create folder inside of it, for example, let's imagine users home directory, for multiple users:
AP 1, UID=1001, GID=1001
AP2, UID=1002, GID=1002
for example this works, of course you would need to specify a storage class per user and you are still limited to the 120 APs, but well, we are trying to get somewhere to "bypass" that limitation and still have permissions in the structure.