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Allow REST to support disk/by-id and "smallest" for image disk. - #5542

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stoo-davies:stoo-4990-rest
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Allow REST to support disk/by-id and "smallest" for image disk.#5542
stoo-davies wants to merge 3 commits into
NVIDIA:mainfrom
stoo-davies:stoo-4990-rest

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@stoo-davies

@stoo-davies stoo-davies commented Aug 28, 2026

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Follow on from PR 5520 and 5260. The disk_imaging.sh script now supports
image_disk=/dev/disk/by-id/xxxxx or image_disk=smallest
In addition to the previous /dev/nvme and /dev/sd names.

Related issues

#4990

Type of Change

  • Add - New feature or capability
  • Change - Changes in existing functionality
  • Fix - Bug fixes
  • Remove - Removed features or deprecated functionality
  • Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

  • This PR contains breaking changes

Testing

  • Unit tests added/updated
  • Integration tests added/updated
  • Manual testing performed
  • No testing required (docs, internal refactor, etc.)

Additional Notes

Signed-off-by: Stoo Davies <189670495+stoo-davies@users.noreply.github.com>
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Reviewing files that changed from the base of the PR and between c39eaab and 4f27841.

⛔ Files ignored due to path filters (3)
  • rest-api/sdk/standard/model_operating_system.go is excluded by !rest-api/sdk/standard/model_*.go
  • rest-api/sdk/standard/model_operating_system_create_request.go is excluded by !rest-api/sdk/standard/model_*.go
  • rest-api/sdk/standard/model_operating_system_update_request.go is excluded by !rest-api/sdk/standard/model_*.go
📒 Files selected for processing (4)
  • pxe/common_files/disk_imaging.sh
  • pxe/common_files/disk_imaging_test.sh
  • rest-api/docs/index.html
  • rest-api/openapi/spec.yaml

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Summary by CodeRabbit

  • New Features

    • Added support for selecting the smallest eligible disk when configuring image targets.
    • Added support for NVMe, SCSI, and /dev/disk/by-id device paths.
    • Operating system image responses now include the configured boot disk.
  • Documentation

    • Clarified supported disk formats, fallback behavior, EFI partition selection, and whole-disk image targets.
  • Bug Fixes

    • Improved disk target validation for supported device paths and selectors.
    • Improved PXE boot parameter parsing, including values containing special characters and unknown parameters.

Walkthrough

The API accepts additional whole-disk targets, including smallest and supported device paths. OpenAPI descriptions document disk selection behavior. ImageDisk maps to the image attributes protobuf BootDisk. PXE parsing now uses a dedicated kernel command-line argument parser.

Changes

Disk imaging

Layer / File(s) Summary
Disk target validation and API contract
rest-api/api/pkg/api/model/util/validation.go, rest-api/api/pkg/api/model/operatingsystem_test.go, rest-api/openapi/spec.yaml
DiskImagePathRegex accepts smallest, NVMe, SCSI, and /dev/disk/by-id targets. Tests cover long device identifiers and smallest. OpenAPI descriptions document smallest-suitable-disk selection, EFI tie-breaking, and fallback behavior.
Image disk protobuf mapping
rest-api/db/pkg/db/model/operatingsystem.go, rest-api/db/pkg/db/model/operatingsystem_test.go
ToImageAttributesProto maps ImageDisk to BootDisk. The conversion test verifies the mapping.
PXE kernel command-line parsing
pxe/common_files/disk_imaging.sh, pxe/common_files/disk_imaging_test.sh
disk_imaging.sh tokenizes /proc/cmdline and delegates supported arguments to parse_kernel_cmdline_argument. Unknown arguments are ignored. Tests cover values containing delimiters, URL formats, case normalization, credentials, and unchanged state after rejection.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 4f278

The PR expands accepted image-disk selections to include disk/by-id paths and the smallest disk; no actionable merge-blocking risk remains beyond normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant ProcCmdline
  participant disk_imaging_main
  participant parse_kernel_cmdline_argument
  participant ImagingConfig
  ProcCmdline->>disk_imaging_main: provide kernel arguments
  disk_imaging_main->>parse_kernel_cmdline_argument: parse each argument
  parse_kernel_cmdline_argument->>ImagingConfig: assign supported values
  parse_kernel_cmdline_argument-->>disk_imaging_main: reject unknown arguments
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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 6 files. (1 skipped: 1 … Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Title check ✅ Passed The title clearly identifies the primary change: REST support for /dev/disk/by-id paths and the smallest image disk selector.
Description check ✅ Passed The description directly explains the supported image_disk values, references related work and issue #4990, and records the testing approach.
Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 6 files. (1 skipped: 1 unsupported.)

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pbreton commented Aug 29, 2026

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@pbreton I will run a full review of all changes in #5542.

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pbreton commented Aug 29, 2026

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[P2] Keep accepted by-id values parseable

DiskImagePathRegex now accepts any non-space, non-slash by-id suffix, including = and strings such as image_url. disk_imaging.sh still recognizes arguments with unanchored grep image_* checks and extracts values using cut -d'=' -f2, so image_disk=/dev/disk/by-id/foo=bar is truncated to /dev/disk/by-id/foo; a suffix containing image_url can also be mistaken for that separate argument. Please parse exact image_disk=/image_url= prefixes and preserve everything after the first = (for example, with shell prefix removal), or restrict identifiers to what the parser can safely consume.

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Actionable comments posted: 1

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Inline comments:
In `@rest-api/openapi/spec.yaml`:
- Around line 20317-20318: The OpenAPI descriptions for the smallest
disk-selection option omit the suitability constraint. Update all three
descriptions for smallest to say it selects the smallest suitable disk,
preserving the existing EFI tie-breaker wording.
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📥 Commits

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⛔ Files ignored due to path filters (3)
  • rest-api/sdk/standard/model_operating_system.go is excluded by !rest-api/sdk/standard/model_*.go
  • rest-api/sdk/standard/model_operating_system_create_request.go is excluded by !rest-api/sdk/standard/model_*.go
  • rest-api/sdk/standard/model_operating_system_update_request.go is excluded by !rest-api/sdk/standard/model_*.go
📒 Files selected for processing (6)
  • rest-api/api/pkg/api/model/operatingsystem_test.go
  • rest-api/api/pkg/api/model/util/validation.go
  • rest-api/db/pkg/db/model/operatingsystem.go
  • rest-api/db/pkg/db/model/operatingsystem_test.go
  • rest-api/docs/index.html
  • rest-api/openapi/spec.yaml

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Comment thread rest-api/openapi/spec.yaml Outdated
Signed-off-by: Stoo Davies <189670495+stoo-davies@users.noreply.github.com>

# Conflicts:
#	rest-api/docs/index.html
@thossain-nv thossain-nv added the rest-api Add this label when an issue or PR concerns NICo REST API label Aug 31, 2026 — with ChatGPT Codex Connector
Signed-off-by: Stoo Davies <189670495+stoo-davies@users.noreply.github.com>
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/ok to test 4f27841

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🕐 Last updated: 2026-08-31 17:37:29 UTC | Commit: 4f27841

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@stoo-davies
stoo-davies marked this pull request as ready for review August 31, 2026 21:18
@stoo-davies
stoo-davies requested a review from a team as a code owner August 31, 2026 21:18

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Comment thread rest-api/api/pkg/api/model/util/validation.go
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