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Invoke-WinUtilISODism threw only a raw exit code on DISM failure (e.g. "DISM add-driver failed with exit code 112"), leaving users to look up what the number means themselves. Adds a $knownExitCode lookup table mapping common Windows/DISM exit codes (disk full, access denied, file/path not found, file in use, timeout, etc.) to plain-English explanations. When a failure's exit code is recognized, the thrown message now includes the explanation in parentheses; unrecognized codes fall back to the original plain-number message. Verified the script still parses correctly after the change.
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WalkthroughThe DISM helper now describes selected failure exit codes and retains a numeric-only fallback for unknown codes. Tests verify reporting and partial-mount cleanup. The guide documents troubleshooting actions. ChangesDISM error reporting
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The troubleshooting guide now points readers to Microsoft’s System Error Codes reference. This is safe to merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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💡 Codex Reviewwinutil/functions/private/Invoke-WinUtilISOScript.ps1 Lines 258 to 259 in a22f141  Document the new DISM error messages
When driver servicing hits one of these mapped exit codes, Win11 Creator now presents new user-facing diagnostics, but AGENTS.md reference: AGENTS.md:L137-L140 ℹ️ About Codex in GitHubCodex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you
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Inline comments:
In `@functions/private/Invoke-WinUtilISOScript.ps1`:
- Around line 258-262: Add a focused DISM test around the exit-code handling
that forces recognized code 112 and asserts the thrown message includes its
mapped explanation, then force an unrecognized code and assert the message
retains the numeric-only fallback. Use the existing DISM test setup and symbols
surrounding the $knownExitCode handling without changing production behavior.
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Adds a test verifying a known exit code (112) produces the friendly explanation in the thrown message, alongside the existing test verifying an unrecognized code still falls back to the plain numeric message. Verified: all 35 tests in win11creator.Tests.ps1 pass.
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Inline comments:
In `@pester/win11creator.Tests.ps1`:
- Around line 905-906: Add a focused Pester case alongside the existing
`Invoke-WinUtilISODism` exit-code test using an unmapped numeric code such as
999, and assert the resulting error includes that code without a parenthesized
explanation. Keep the existing mapped-code coverage unchanged.
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Adds a Troubleshooting table row explaining the new DISM error message format (exit code + explanation in parentheses), with guidance for the most common cases and a link to Microsoft's full error code reference for anything not explained.
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In `@docs/src/content/docs/guides/win11creator.mdx`:
- Line 142: Update the DISM error-code reference link in the documentation table
to use a valid, live Microsoft Learn URL, while preserving the surrounding
guidance and link text.
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The unmapped-code test called Invoke-WinUtilISOScript twice — once via Should -Throw, once to capture the message for the no-parens check — causing $script:dismCalls to double-count. Consolidated to a single call, checking both the exit code and the absence of a parenthesized explanation against one captured exception message. Verified: all 36 tests in win11creator.Tests.ps1 pass.
Replaced the dead windows-hardware/manufacture link with Microsoft's actual System Error Codes reference page, which DISM exit codes correspond to.
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Type of Change
Description
Invoke-WinUtilISODism threw only a raw exit code on DISM failure
(e.g. "DISM add-driver failed with exit code 112"), leaving users to
look up what the number means themselves.
Adds a $knownExitCode lookup table mapping common Windows/DISM exit
codes (disk full, access denied, file/path not found, file in use,
timeout, etc.) to plain-English explanations. When a failure's exit
code is recognized, the thrown message now includes the explanation
in parentheses; unrecognized codes fall back to the original
plain-number message.
Verified the script still parses correctly after the change.