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C#: Support replaces-base via the DependabotProxy. - #22494
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Copilot review overview
🟡 Changes recommended
Feed-check opt-out behavior is regressed, and one fallback path can still retain nuget.org.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review tier: Balanced
Findings: 1
New issues introduced by this change (1)
| Severity | Finding |
|---|---|
 | csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This now probes the default feeds even when `CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK=fal… |
What changed in this PR
Adds replaces-base support for private NuGet registries used during buildless C# dependency restoration.
Changes:
- Parses and exposes replacement-base registry URLs.
- Uses replacement registries for default and fallback feeds.
- Adds unit coverage and a change note.
| File | Description |
|---|---|
csharp/ql/lib/change-notes/2026-09-03-replaces-base.md | Documents the new behavior. |
csharp/extractor/Semmle.Extraction.Tests/FeedManager.cs | Tests default and fallback feed selection. |
csharp/extractor/Semmle.Extraction.Tests/DependabotProxy.cs | Tests replaces-base parsing. |
csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/PackagesConfigRestorer.cs | Uses reachable default feeds during restoration. |
csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/IDependabotProxy.cs | Exposes replacement-base registry URLs. |
csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs | Selects replacement registries as default feeds. |
csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependabotProxy.cs | Parses and stores registry replacement metadata. |
Suppressed comments (1)
csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs:315
- The replacement is only applied through
GetReachableFallbackNugetFeeds, butNugetPackageRestorer.DownloadMissingPackagescalls that path only when feed responsiveness checks are enabled; its disabled branch usesAllFeeds, which can still contain inheritednuget.org. Thusreplaces-base: truedoes not actually replace the public base feed in fallback downloads when the supported responsiveness opt-out is used. Please separate construction of the configured fallback set from reachability filtering and use that set in both branches.
fallbackFeeds.UnionWith(defaultFeeds);
logger.LogInfo($"No fallback NuGet feeds specified. Adding default feeds: {string.Join(", ", defaultFeeds.OrderBy(f => f))}");
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…Ls to replace the default NuGet feed.
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Copilot review overview
🟡 Changes recommended
The responsiveness-check opt-out path can still use public NuGet.org despite a configured replacement registry.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review tier: Balanced
Findings: 2
New issues introduced by this change (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — DefaultFeeds is substituted only on the responsiveness-checking path. When… |
Pre-existing issues (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This now probes the default feeds even when `CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK=fal… View comment |
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Copilot review overview
🟡 Changes recommended
Public NuGet endpoint variants such as the supported v2 URL are not replaced.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review tier: Balanced
Findings: 2
New issues introduced by this change (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This only recognizes the canonical v3 URL, so a configured public NuGet source such as… |
Pre-existing issues (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — DefaultFeeds is substituted only on the responsiveness-checking path. When… View comment |
Issues resolved since last review (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This now probes the default feeds even when `CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK=fal… View resolved comment |
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Copilot review overview
🟡 Changes recommended
The release note inaccurately describes the replacement behavior as fallback-only.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review tier: Balanced
Findings: 1
New issues introduced by this change (1)
| Severity | Finding |
|---|---|
 | csharp/ql/lib/change-notes/2026-09-03-replaces-base.md — The release note describes the replacement as fallback-only, but GetFeeds now replaces NuGet.org… |
Issues resolved since last review (2)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This only recognizes the canonical v3 URL, so a configured public NuGet source such as… View resolved comment |
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — DefaultFeeds is substituted only on the responsiveness-checking path. When… View resolved comment |
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Copilot review overview
🟢 Approval recommended
The implementation is coherent and the remaining documentation and regression-test gaps are minor.
Review tier: Balanced
Findings: 1
New issues introduced by this change (2)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.Tests/FeedManager.cs — The replacement test still supplies the canonical v3 endpoint in both inputs, so the newly… |
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This makes the fallback default conditional on replaces-base, but the public XML documentation… |
Issues resolved since last review (1)
| Severity | Finding |
|---|---|
| csharp/ql/lib/change-notes/2026-09-03-replaces-base.md — The release note describes the replacement as fallback-only, but GetFeeds now replaces NuGet.org… View resolved comment |
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Copilot review overview
🟡 Changes recommended
A trailing semicolon after the nested class declaration causes a compilation error.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review tier: Balanced
Findings: 1
Pre-existing issues (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/FeedManager.cs — This makes the fallback default conditional on replaces-base, but the public XML documentation… View comment |
Issues resolved since last review (1)
| Severity | Finding |
|---|---|
| csharp/extractor/Semmle.Extraction.Tests/FeedManager.cs — The replacement test still supplies the canonical v3 endpoint in both inputs, so the newly… View resolved comment |
…s replaces-base is set, otherwise use nuget.org.
… private registries with replaces-base: true is set.
…vate registries are configured (to make implementation consistent).
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In this PR we add support using the
replace-baseflag for privateregistries. If any private registries are configured to replacebase, then we use these registries as NuGet feed sources instead of the default publicnuget.orginfallback scenariosall scenarios - even if the public NuGet feed is mentioned innuget.configfiles (unless it is explicitly configured as a fallback feed as well).As an add on for this PR, we also prevent the fallback that doesn't provide feeds via the command line when restoring packages manually, if private registries are configured (to make the logic consistent with other similar paths).
DCA looks good.