project: Add support for Block Storage Volume Limit Increase

[lgarber-akamai]

📝 Description

This pull request adds support for the Block Storage Volume Limit increase project, which extends the maximum number of volumes that can be attached to a Linode to 64 (depending on amount of ram allocated for VM).

✔️ How to Test

The following test steps assume you have pulled down this PR locally.

Unit Testing

make test-unit

Integration Testing

NOTE: The following tests assume you are running against an environment where this feature is available (e.g. DevCloud).

 make fixtures TEST_ARGS="-run TestInstance_Config_VolumeLimitExtension"

[Copilot]

Pull request overview

This PR expands the volume limit support for Linode instances by adding support for additional device mappings beyond the original SDA-SDH range. The changes enable instances to support up to 38 device slots (SDI-SDZ, SDAA-SDAZ, and SDBA-SDBL), which is necessary for larger instance types that can accommodate more volumes.

Key Changes:

• Extended InstanceConfigDeviceMap struct to support device mappings from SDI through SDBL
• Added comprehensive unit and integration tests to validate the expanded device mapping functionality
• Updated test fixtures to include the new device mapping fields

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
instance_configs.go	Extends InstanceConfigDeviceMap struct with 30 new device fields (SDI-SDL, SDAA-SDAZ, SDBA-SDBL) to support expanded volume limits
test/unit/instance_config_test.go	Adds device mapping assertions to existing create and update unit tests
test/unit/fixtures/instance_config_create.json	Updates fixture to include device mapping in create test response
test/unit/fixtures/instance_config_update.json	Updates fixture to include device mapping in update test response
test/integration/instance_config_test.go	Adds new integration test validating volume attachment to extended device slots (SDK, SDL)
test/integration/fixtures/TestInstance_Config_VolumeLimitExtension.yaml	Provides recorded API interactions for the new integration test

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[Copilot]

The RootDevice is set to '/dev/sdac', but the devices map only defines SDA, SDL, and SDK. The root device path should correspond to one of the configured devices. Consider changing this to '/dev/sda' which is the actual disk device configured.

[lgarber-akamai]

I originally wanted to deprecate Devices *InstanceConfigDeviceMap in favor of a new DeviceMap map[string]InstanceConfigDevice field, but this caused some ambiguous behavior in GetCreateOpts() and GetUpdateOpts().

Since the limit as of now is 64, I figure we can implement that in future major version 👍

[jriddle-linode]

LGTM works locally