From f1970f5ca30a3ba974274132e05c4bb012faac74 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20K=C3=B6plinger?= <alex.koeplinger@outlook.com>
Date: Mon, 11 May 2026 19:11:45 +0200
Subject: [PATCH] Don't download releases-index.json to resolve major version
 (#560)

* Don't download releases-index.json to resolving major version

Starting with .NET 5 the minor version is always zero.
The earlier releases don't get new versions anymore so we can hardcode the minor version instead of downloading releases-index.json to do the lookup.

* Remove unused variable

* Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Commit dist/setup/index.js

* Refresh after copilot commits

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 dist/setup/index.js | 34 ++++++++++++++++------------------
 src/installer.ts    | 44 ++++++++++++++++----------------------------
 2 files changed, 32 insertions(+), 46 deletions(-)

diff --git a/dist/setup/index.js b/dist/setup/index.js
index c58f527..ac2cc6c 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -78768,7 +78768,22 @@ class DotnetVersionResolver {
             this.resolvedArgument.value = `${major}.${minor}`;
         }
         else if (this.isNumericTag(major)) {
-            this.resolvedArgument.value = await this.getLatestByMajorTag(major);
+            // Starting with .NET 5, the minor version is always zero.
+            // Hardcode the earlier versions because they will not get new releases.
+            switch (major) {
+                case '1':
+                    this.resolvedArgument.value = '1.1';
+                    break;
+                case '2':
+                    this.resolvedArgument.value = '2.2';
+                    break;
+                case '3':
+                    this.resolvedArgument.value = '3.1';
+                    break;
+                default:
+                    this.resolvedArgument.value = `${major}.0`;
+                    break;
+            }
         }
         else {
             // If "dotnet-version" is specified as *, x or X resolve latest version of .NET explicitly from LTS channel. The version argument will default to "latest" by install-dotnet script.
@@ -78832,23 +78847,6 @@ class DotnetVersionResolver {
         }
         return releasesInfo[0]['channel-version'];
     }
-    async getLatestByMajorTag(majorTag) {
-        const httpClient = new hc.HttpClient('actions/setup-dotnet', [], {
-            allowRetries: true,
-            maxRetries: 3
-        });
-        const response = await httpClient.getJson(DotnetVersionResolver.DotnetCoreIndexUrl);
-        const result = response.result || {};
-        const releasesInfo = result['releases-index'];
-        const releaseInfo = releasesInfo.find(info => {
-            const sdkParts = info['channel-version'].split('.');
-            return sdkParts[0] === majorTag;
-        });
-        if (!releaseInfo) {
-            throw new Error(`Could not find info for version with major tag: "${majorTag}" at ${DotnetVersionResolver.DotnetCoreIndexUrl}`);
-        }
-        return releaseInfo['channel-version'];
-    }
     static DotnetCoreIndexUrl = 'https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json';
 }
 exports.DotnetVersionResolver = DotnetVersionResolver;
diff --git a/src/installer.ts b/src/installer.ts
index 2402316..85a2d82 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -125,7 +125,22 @@ export class DotnetVersionResolver {
     } else if (this.isNumericTag(major) && this.isNumericTag(minor)) {
       this.resolvedArgument.value = `${major}.${minor}`;
     } else if (this.isNumericTag(major)) {
-      this.resolvedArgument.value = await this.getLatestByMajorTag(major);
+      // Starting with .NET 5, the minor version is always zero.
+      // Hardcode the earlier versions because they will not get new releases.
+      switch (major) {
+        case '1':
+          this.resolvedArgument.value = '1.1';
+          break;
+        case '2':
+          this.resolvedArgument.value = '2.2';
+          break;
+        case '3':
+          this.resolvedArgument.value = '3.1';
+          break;
+        default:
+          this.resolvedArgument.value = `${major}.0`;
+          break;
+      }
     } else {
       // If "dotnet-version" is specified as *, x or X resolve latest version of .NET explicitly from LTS channel. The version argument will default to "latest" by install-dotnet script.
       this.resolvedArgument.value = 'LTS';
@@ -207,33 +222,6 @@ export class DotnetVersionResolver {
     return releasesInfo[0]['channel-version'];
   }
 
-  private async getLatestByMajorTag(majorTag: string): Promise<string> {
-    const httpClient = new hc.HttpClient('actions/setup-dotnet', [], {
-      allowRetries: true,
-      maxRetries: 3
-    });
-
-    const response = await httpClient.getJson<any>(
-      DotnetVersionResolver.DotnetCoreIndexUrl
-    );
-
-    const result = response.result || {};
-    const releasesInfo: any[] = result['releases-index'];
-
-    const releaseInfo = releasesInfo.find(info => {
-      const sdkParts: string[] = info['channel-version'].split('.');
-      return sdkParts[0] === majorTag;
-    });
-
-    if (!releaseInfo) {
-      throw new Error(
-        `Could not find info for version with major tag: "${majorTag}" at ${DotnetVersionResolver.DotnetCoreIndexUrl}`
-      );
-    }
-
-    return releaseInfo['channel-version'];
-  }
-
   static DotnetCoreIndexUrl =
     'https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json';
 }