Improve global.json SDK version validation for rollForward by priyagupta108 · Pull Request #742 · actions/setup-dotnet

priyagupta108 · 2026-06-11T09:46:28Z

Description:
This PR validates the sdk.version format in global.json when rollForward is specified and skips rollForward optimization for prerelease SDK versions.

Related issue:
#739
#740

Check list:

Mark if documentation changes are required.
Mark if tests were added or updated to cover the changes.

Copilot

Pull request overview

This PR hardens global.json handling in setup-dotnet by validating sdk.version when rollForward is present (to avoid parsing errors) and by preventing the action’s rollForward “optimization” from rewriting prerelease SDK versions (so prerelease pins remain exact).

Changes:

Add sdk.version format validation (full SDK version required) before applying rollForward optimization.
Skip rollForward optimization entirely for prerelease SDK versions to ensure exact prerelease installs.
Update documentation and e2e workflow coverage to reflect and exercise the new behavior.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
`src/setup-dotnet.ts`	Adds `sdk.version` validation for rollForward and skips optimization for prerelease versions.
`README.md`	Documents that prerelease SDK pins are installed exactly regardless of `rollForward`.
`dist/setup/index.js`	Updates the compiled distribution output to match the TypeScript changes.
`.github/workflows/e2e-tests.yml`	Adjusts e2e rollForward test inputs to use a full SDK version.

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Frulfump · 2026-06-11T12:58:35Z

Shouldn't version be validated even if rollForward isn't specified? It has a default value even if not present.

From the docs https://learn.microsoft.com/en-us/dotnet/core/tools/global-json#matching-rules

If a global.json file is found and it specifies an SDK version:

If no rollForward value is set, it uses patch as the default rollForward policy.

priyagupta108 · 2026-06-15T10:37:06Z

@Frulfump,
Thank you for the suggestion. However, validating sdk.version when rollForward is not specified would be a breaking change. Users with incomplete versions, such as 8.0, that previously worked would suddenly start failing.

The validation is scoped to this case because the rollForward parsing logic requires a full version to avoid cryptic errors. We are exploring broader validation for consistency with the official global.json spec in a follow-up change.

For now, this PR is focused on fixing #739 and #740.

Frulfump · 2026-06-15T10:48:21Z

It could be a warning not necessarily a hard break to guide users to a valid global.json and it already has a default value so it's always there from the .NET SDKs perspective at least.

priyagupta108 · 2026-06-16T13:38:53Z

Thanks for the follow-up, @Frulfump. We really appreciate you digging into this.

Just one quick clarification on the mechanics. The patch default you're referencing lives in the .NET CLI/host, which reads global.json at runtime to select an SDK that is already installed on the machine.

setup-dotnet works at a slightly different layer. It runs before any SDK exists, and its job is to decide what to download. So when rollForward is omitted, it doesn't apply that patch default itself. It simply forwards sdk.version to the version resolver and install script, without any rollForward handling.

For that reason, the hard error in this PR is intentionally scoped to the rollForward case, where an incomplete version genuinely breaks our parsing (#739).

Hope that helps clarify the intent.

Frulfump · 2026-06-16T14:10:11Z

@priyagupta108 Thanks for the additional info. That makes sense!

benmccallum · 2026-06-26T06:19:05Z

This broke us 😄 We were, admittedly + wrongly, doing 9.0.0 with rollForward, I guess never realising that wasn't a valid version and it starts at 9.0.100, so the regex validating the patch is non-zero caught us out whereas it previously worked. Easy enough to fix, but there might be a lot of folks affected temporarily by this and it might've warranted a major version bump - though I do get that if it's breaking your rollForward logic, it may have been required to force us all on the right path ASAP.

Frulfump · 2026-06-26T11:53:46Z

There's an issues here for that if you want to follow / upvote that. #753

And here's the .NET SDK issue to turn it into an error instead of just informational dotnet/sdk#49816

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required: false by [`@kranthipoturaju`](https://github.com/kranthipoturaju) in [actions/setup-dotnet#737](https://redirect.github.com/actions/setup-dotnet/pull/737) > > ### Bug Fixes > > * Fix global.json creation command by [`@michal2612`](https://github.com/michal2612) in [actions/setup-dotnet#694](https://redirect.github.com/actions/setup-dotnet/pull/694) > > ### Dependency Updates > > * Upgrade `@actions/cache` to 5.1.0, log cache write denied by [`@jasongin`](https://github.com/jasongin) in [actions/setup-dotnet#746](https://redirect.github.com/actions/setup-dotnet/pull/746) > > New Contributors > ---------------- > > * [`@jasongin`](https://github.com/jasongin) made their first contribution in [actions/setup-dotnet#746](https://redirect.github.com/actions/setup-dotnet/pull/746) > * [`@michal2612`](https://github.com/michal2612) made their first contribution in [actions/setup-dotnet#694](https://redirect.github.com/actions/setup-dotnet/pull/694) > * [`@kranthipoturaju`](https://github.com/kranthipoturaju) made their first contribution in [actions/setup-dotnet#737](https://redirect.github.com/actions/setup-dotnet/pull/737) > * [`@StephenCleary`](https://github.com/StephenCleary) made their first contribution in [actions/setup-dotnet#717](https://redirect.github.com/actions/setup-dotnet/pull/717) > > **Full Changelog**: <actions/setup-dotnet@v5...v5.4.0> Commits * [`26b0ec1`](actions/setup-dotnet@26b0ec1) Expand the CSC problem matcher to light up more errors on GitHub. ([#717](https://redirect.github.com/actions/setup-dotnet/issues/717)) * [`da5e548`](actions/setup-dotnet@da5e548) docs(action): explicitly mark all optional inputs with required: false ([#737](https://redirect.github.com/actions/setup-dotnet/issues/737)) * [`9bd3b44`](actions/setup-dotnet@9bd3b44) Improve readability of global.json creation command ([#694](https://redirect.github.com/actions/setup-dotnet/issues/694)) * [`4406a63`](actions/setup-dotnet@4406a63) Bump `@actions/cache` to 5.1.0, log cache write denied ([#746](https://redirect.github.com/actions/setup-dotnet/issues/746)) * [`dc3262d`](actions/setup-dotnet@dc3262d) pin actions to commit SHAs in workflows ([#744](https://redirect.github.com/actions/setup-dotnet/issues/744)) * [`95a3f8b`](actions/setup-dotnet@95a3f8b) Validate global.json SDK version before rollForward optimization ([#742](https://redirect.github.com/actions/setup-dotnet/issues/742)) * See full diff in [compare view](actions/setup-dotnet@9a946fd...26b0ec1) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- Dependabot commands and options You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore major version` will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself) - `@dependabot ignore minor version` will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself) - `@dependabot ignore ` will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself) - `@dependabot unignore ` will remove all of the ignore conditions of the specified dependency - `@dependabot unignore ` will remove the ignore condition of the specified dependency and ignore conditions

Validate global.json SDK version before rollForward optimization

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Copilot AI review requested due to automatic review settings June 11, 2026 09:46

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Comment thread src/setup-dotnet.ts

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lmvysakh approved these changes Jun 11, 2026

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This was referenced Jun 12, 2026

5.3.0 breaks global.json with latestFeature #739

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5.3.0 breaks the installation of .NET exact SDK versions when rollForward is present #740

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priya-kinthali approved these changes Jun 16, 2026

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lmvysakh approved these changes Jun 16, 2026

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HarithaVattikuti approved these changes Jun 16, 2026

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HarithaVattikuti merged commit 95a3f8b into actions:main Jun 16, 2026
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Gallimathias mentioned this pull request Jun 26, 2026

Latest release Breaks builds #753

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Improve global.json SDK version validation for rollForward#742

Improve global.json SDK version validation for rollForward#742
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