ni_provisioning: target disk from answers file

[erickshepherdNI]

Summary of Changes

There are two primary changes:

• Make disk selection possible using the answers file
  • This was done by adding a new PROVISION_TARGET_DISK that can be added to the answers file and will overwrite the current TARGET_DISK variable when present.
  • I also added some slight refactoring to read the answers file immediately after reading the script arguments instead of doing it in each branch of the following if-block.
• Add a interactive disk selection mode
  • This can be enablede by using a new -i argument for the ni_provisioning script when running it manually.
  • When enabled, a list of valid provisioning targets will be gathered using the same method we currently use to automatically select a target and each option will be printed followed by a prompt to select one.
    • There is a slight change to which block devices are valid, which is that removable devices are displayed in the interactive option.

The default behavior is unchanged, which is to say that if the default provisioning option is selected and no answer file is present, then the first valid block device that is found will be selected for provisioning.

Justification

These changes will help support the upcoming Kinabalu devices that have multiple internal disks and require a way to select which one should be provisioned.

AB#3813755

Testing

For all of the testing I set up a cRIO-9033 and added an SD card that could be provisioned.

• Tested that the behavior if PROVISION_TARGET_DISK is undefined or if the interactive case is not used matches our current default behavior. This is that the first valid disk is selected and any removable disks are skipped.
• Tested that PROVISION_TARGET_DISK can be added to an answer file and the disk specified there is selected.
• Tested that using the -i script argument provides a list of valid targets and allows the user to select one.
  • Confirmed that removable disks are displayed as options.
  • Checked that the user prompt does not accept any inputs besides the displayed numbers.
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• I have built the core package feed with this PR in place. (bitbake packagefeed-ni-core)

Procedure

• I certify that the contents of this pull request complies with the Developer Certificate of Origin.

[Copilot]

Pull request overview

Adds support for explicitly selecting the provisioning target disk via an answers file and introduces an interactive (-i) disk selection mode for devices with multiple internal disks.

Changes:

• Introduces set_target_from_answer_file() to override TARGET_DISK from an answers-file value.
• Adds -i argument and select_target_block_device() for interactive disk selection.
• Refactors ni_provisioning to source the user answers file once near startup.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 8 comments.

File	Description
recipes-core/initrdscripts/files/ni_provisioning.common	Adds answer-file target override helper, interactive disk selection, and -i flag parsing/behavior.
recipes-core/initrdscripts/files/ni_provisioning	Moves user answer-file sourcing earlier and applies the answer-file disk override.

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[gratian]

LGTM, just a small nitpick on the location for sourcing the answer file.