Add CVT no-extension test case (verify_asr_by_cvt_no_extension)

[mohshei-786]

Summary

Add a new LISA test case verify_asr_by_cvt_no_extension that validates the ASR disk filter driver (involflt) without relying on Azure VM extensions. This mirrors the LinuxCVT ADO pipeline approach for environments where VM extensions are not available (e.g., SAIL OS, custom kernels).

Changes

New file: scripts/cvt_no_extension.sh

• Full CVT test orchestration script (no extensions needed)
• Downloads driver tarball + CVT test binaries from URLs
• Loads driver via insmod (or uses pre-loaded driver)
• Runs all 17 CVT test cases with retry logic
• Generates cvt_status.json with per-test-case status tracking (matches private CVT pipeline format)
• Handles DNS fixes, device node creation, VacpIOBarrierTimeout tuning
• Identifies source (1GB) and target (10GB) disks by blockdev size

Modified: cvt.py

• Added verify_asr_by_cvt_no_extension test case
• Added helper functions: _get_driver_url(), _run_cvt_no_extension()
• Added .json file collection in _copy_cvt_logs() for status file retrieval
• Handles ready platform gracefully (no disk add/delete when not supported)

Test Results

All 17/17 CVT tests PASSED on SAIL OS VM (SLES 15 SP4, kernel 5.14.21-150400.22-default):

• mixed, 16k_random, 16k_seq, 1mb_random, 1mb_seq, 4k_random, 4k_seq, 4mb_random, 4mb_seq, 512k_random, 512k_seq, 64k_random, 64k_seq, 8mb_random, 8mb_seq, 9mb_random, 9mb_seq

Total execution: ~138 minutes (8 min/test × 17 tests)

cvt_status.json Format

{
    "testStatus": "Succeeded",
    "startTime": "2026-06-01T11:05:57Z",
    "lastUpdated": "2026-06-01T13:23:10Z",
    "testDetails": {
        "vmName": "sail-cvt-test",
        "os": "SLES 15-SP4",
        "kernelVersion": "5.14.21-150400.22-default",
        "driverVersion": "9.65.7900.1",
        "productVersion": "9.65.7900.1",
        "testCases": [
            {"name": "mixed", "status": "Succeeded", "time": "593"},
            ...
        ]
    }
}

ADO Work Item

AB#38231853

Tools Used

powershell, grep, glob, view, edit, create, paramiko (SSH), bluebird

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a “no VM extensions” execution path for ASR CVT by introducing a standalone runner script, wiring it into the existing LISA CVT suite, and enhancing log collection to include JSON status output.

Changes:

• Add cvt_no_extension.sh to download CVT binaries/driver, load the driver, run CVT, and emit a cvt_status.json.
• Extend _copy_cvt_logs to also collect *.json artifacts.
• Add a new LISA test case that runs CVT without extensions and add URL defaults/OS-based driver URL selection.

Reviewed changes

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

File	Description
lisa/microsoft/testsuites/vm_extensions/scripts/cvt_no_extension.sh	New no-extension CVT runner that also writes status JSON and orchestrates driver/binary setup.
lisa/microsoft/testsuites/vm_extensions/cvt.py	Adds no-extension test flow + defaults; expands log copying to include JSON artifacts.

[mohshei-786]

All 6 review comments addressed in commit 6a2cdd7:

1. JSON insertion logic — testCases array now uses multi-line format; awk insertion matches ^\s*\] and handles comma placement correctly.
2. wget --no-check-certificate — Removed. Uses system CAs by default; opt-in bypass via SKIP_TLS_VERIFY=1 env var.
3. mkfs/mount exit codes — Now checked; logs blkid/mount diagnostics on failure before exiting.
4. DNS /etc/resolv.conf — Guards against duplicate entries; logs resolver state before/after.
5. Private _command/_cwd — Replaced with public script.command property.
6. Unused data_disks param — Removed from signature and call site.

[Copilot]

Pull request overview

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

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 10 comments.

[LiliDeng]

@mohshei-786 please check the error when run against canonical 0001-com-ubuntu-server-focal 20_04-lts-gen2 latest + verify_asr_by_cvt_no_extension

+ cvt_binaries_url=https://aka.ms/LinuxCVTTestBinaries

+ driver_tarball_url=

+ FAILED_TEST=1

+ PAS'
2026-06-08 13:50:48.897[2348][INFO] lisa.case[verify_asr_by_cvt_no_extension][lisa_0_0] cvt script stderr : ''
2026-06-08 13:50:48.897[2348][INFO] lisa.case[verify_asr_by_cvt_no_extension][lisa_0_0] cvt script exit code : '1'
2026-06-08 13:50:48.897[2348][DEBUG] lisa.env[generated_0].node[0].tool[find] initializing tool [find]