Fix dotnet latest resolution

src/dotnet/NOTES.md

@@ -67,7 +67,7 @@ Installing .NET workloads. Multiple workloads can be specified as comma-separate
 ``` json
 "features": {
     "ghcr.io/devcontainers/features/dotnet:2": {
-      "workloads": "aspire, wasm-tools"
+      "workloads": "wasm-tools"
     }
 }
 ```

src/dotnet/README.md

@@ -15,10 +15,10 @@ This Feature installs the latest .NET SDK, which includes the .NET CLI and the s
 
 | Options Id | Description | Type | Default Value |
 |-----|-----|-----|-----|
-| version | Select or enter a .NET SDK version. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version. | string | latest |
-| additionalVersions | Enter additional .NET SDK versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version. | string | - |
-| dotnetRuntimeVersions | Enter additional .NET runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version. | string | - |
-| aspNetCoreRuntimeVersions | Enter additional ASP.NET Core runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version. | string | - |
+| version | Select or enter a .NET SDK version. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version, 'X.Y-preview' or 'X.Y-daily' for prereleases. | string | latest |
+| additionalVersions | Enter additional .NET SDK versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version, 'X.Y-preview' or 'X.Y-daily' for prereleases. | string | - |
+| dotnetRuntimeVersions | Enter additional .NET runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version, 'X.Y-preview' or 'X.Y-daily' for prereleases. | string | - |
+| aspNetCoreRuntimeVersions | Enter additional ASP.NET Core runtime versions, separated by commas. Use 'latest' for the latest version, 'lts' for the latest LTS version, 'X.Y' or 'X.Y.Z' for a specific version, 'X.Y-preview' or 'X.Y-daily' for prereleases. | string | - |
 | workloads | Enter additional .NET SDK workloads, separated by commas. Use 'dotnet workload search' to learn what workloads are available to install. | string | - |
 
 ## Customizations
@@ -95,7 +95,7 @@ Installing .NET workloads. Multiple workloads can be specified as comma-separate
 ``` json
 "features": {
     "ghcr.io/devcontainers/features/dotnet:2": {
-      "workloads": "aspire, wasm-tools"
+      "workloads": "wasm-tools"
     }
 }
 ```

src/dotnet/install.sh

@@ -105,7 +105,7 @@ done
 
 # Install .NET versions and dependencies
 # icu-devtools includes dependencies for .NET
-check_packages wget ca-certificates icu-devtools
+check_packages wget ca-certificates icu-devtools jq
 
 for version in "${versions[@]}"; do
     read -r clean_version quality < <(parse_version_and_quality "$version")

src/dotnet/scripts/dotnet-helpers.sh

@@ -8,40 +8,49 @@
 # Maintainer: The Dev Container spec maintainers
 DOTNET_SCRIPTS=$(dirname "${BASH_SOURCE[0]}")
 DOTNET_INSTALL_SCRIPT="$DOTNET_SCRIPTS/vendor/dotnet-install.sh"
+DOTNET_RELEASES_INDEX_URL="https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json"
 
-# Prints the latest dotnet version in the specified channel
-# Usage: fetch_latest_version_in_channel <channel> [<runtime>]
-# Example: fetch_latest_version_in_channel "LTS"
-# Example: fetch_latest_version_in_channel "6.0" "dotnet"
-# Example: fetch_latest_version_in_channel "6.0" "aspnetcore"
-fetch_latest_version_in_channel() {
-    local channel="$1"
-    local runtime="$2"
-    if [ "$runtime" = "dotnet" ]; then
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Runtime/$channel/latest.version"
-    elif [ "$runtime" = "aspnetcore" ]; then
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/aspnetcore/Runtime/$channel/latest.version"
-    else
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Sdk/$channel/latest.version"
-    fi
-}
-
-# Prints the latest dotnet version
-# Usage: fetch_latest_version [<runtime>]
+# Prints the latest active dotnet version from the releases index.
+# Usage: fetch_latest_version [<target>]
+# With no target, resolves the latest SDK version.
+# With "sdk", resolves the latest SDK version explicitly.
+# With "dotnet" or "aspnetcore", resolves the latest runtime version.
+# Note: the upstream releases index only distinguishes SDK vs runtime for
+# latest resolution, so "dotnet" and "aspnetcore" currently resolve to the
+# same version.
 # Example: fetch_latest_version
+# Example: fetch_latest_version "sdk"
 # Example: fetch_latest_version "dotnet"
 # Example: fetch_latest_version "aspnetcore"
 fetch_latest_version() {
-    local runtime="$1"
-    local sts_version
-    local lts_version
-    sts_version=$(fetch_latest_version_in_channel "STS" "$runtime")
-    lts_version=$(fetch_latest_version_in_channel "LTS" "$runtime")
-    if [[ "$sts_version" > "$lts_version" ]]; then
-        echo "$sts_version"
-    else
-        echo "$lts_version"
-    fi
+    local target="$1"
+    local version_field=""
+    local releases_index=""
+
+    case "$target" in
+        ""|sdk)
+            version_field="latest-sdk"
+            ;;
+        dotnet|aspnetcore)
+            version_field="latest-runtime"
+            ;;
+        *)
+            echo "Unsupported target '$target'. Expected 'sdk', 'dotnet', or 'aspnetcore'." >&2
+            return 1
+            ;;
+    esac
+
+    releases_index="$(wget -qO- "$DOTNET_RELEASES_INDEX_URL")" || return $?
+
+    printf '%s\n' "$releases_index" \
+        | jq -er --arg version_field "$version_field" '
+            .["releases-index"]
+            | map(
+                select(."support-phase" == "active")
+                | .[$version_field]
+            )
+            | .[0]
+        '
 }
 
 # Installs a version of the .NET SDK

test/dotnet/dotnet_helpers.sh

@@ -1,38 +1,48 @@
 #!/bin/bash
 
-# Prints the latest dotnet version in the specified channel
-# Usage: fetch_latest_version_in_channel <channel> [<runtime>]
-# Example: fetch_latest_version_in_channel "LTS"
-# Example: fetch_latest_version_in_channel "6.0" "dotnet"
-# Example: fetch_latest_version_in_channel "6.0" "aspnetcore"
-fetch_latest_version_in_channel() {
-    local channel="$1"
-    local runtime="$2"
-    if [ "$runtime" = "dotnet" ]; then
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Runtime/$channel/latest.version"
-    elif [ "$runtime" = "aspnetcore" ]; then
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/aspnetcore/Runtime/$channel/latest.version"
-    else
-        wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Sdk/$channel/latest.version"
-    fi
-}
+DOTNET_RELEASES_INDEX_URL="https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json"
 
-# Prints the latest dotnet version
-# Usage: fetch_latest_version [<runtime>]
+# Prints the latest active dotnet version from the releases index.
+# Usage: fetch_latest_version [<target>]
+# With no target, resolves the latest SDK version.
+# With "sdk", resolves the latest SDK version explicitly.
+# With "dotnet" or "aspnetcore", resolves the latest runtime version.
+# Note: the upstream releases index only distinguishes SDK vs runtime for
+# latest resolution, so "dotnet" and "aspnetcore" currently resolve to the
+# same version.
 # Example: fetch_latest_version
+# Example: fetch_latest_version "sdk"
 # Example: fetch_latest_version "dotnet"
 # Example: fetch_latest_version "aspnetcore"
 fetch_latest_version() {
-    local runtime="$1"
-    local sts_version
-    local lts_version
-    sts_version=$(fetch_latest_version_in_channel "STS" "$runtime")
-    lts_version=$(fetch_latest_version_in_channel "LTS" "$runtime")
-    if [[ "$sts_version" > "$lts_version" ]]; then
-        echo "$sts_version"
-    else
-        echo "$lts_version"
-    fi
+    local target="$1"
+    local version_field=""
+    local releases_index=""
+
+    case "$target" in
+        ""|sdk)
+            version_field="latest-sdk"
+            ;;
+        dotnet|aspnetcore)
+            version_field="latest-runtime"
+            ;;
+        *)
+            echo "Unsupported target '$target'. Expected 'sdk', 'dotnet', or 'aspnetcore'." >&2
+            return 1
+            ;;
+    esac
+
+    releases_index="$(wget -qO- "$DOTNET_RELEASES_INDEX_URL")" || return $?
+
+    printf '%s\n' "$releases_index" \
+        | jq -er --arg version_field "$version_field" '
+            .["releases-index"]
+            | map(
+                select(."support-phase" == "active")
+                | .[$version_field]
+            )
+            | .[0]
+        '
 }
 
 # Asserts that the specified .NET SDK version is installed

test/dotnet/install_dotnet_lts.sh

@@ -13,7 +13,7 @@ source dev-container-features-test-lib
 source dotnet_env.sh
 source dotnet_helpers.sh
 
-expected=$(fetch_latest_version_in_channel "LTS")
+expected=$(wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Sdk/LTS/latest.version")
 
 check "Latest LTS version installed" \
 is_dotnet_sdk_version_installed "$expected"

test/dotnet/install_dotnet_specific_release.sh

@@ -13,7 +13,7 @@ source dev-container-features-test-lib
 source dotnet_env.sh
 source dotnet_helpers.sh
 
-expected=$(fetch_latest_version_in_channel "10.0")
+expected=$(wget -qO- "https://builds.dotnet.microsoft.com/dotnet/Sdk/10.0/latest.version")
 
 check ".NET Core SDK 10.0 installed" \
 is_dotnet_sdk_version_installed "$expected"

test/dotnet/install_dotnet_workloads.sh

@@ -13,9 +13,6 @@ source dev-container-features-test-lib
 source dotnet_env.sh
 source dotnet_helpers.sh
 
-check "Aspire is installed" \
-is_dotnet_workload_installed "aspire"
-
 check "WASM tools are installed" \
 is_dotnet_workload_installed "wasm-tools"
 

test/dotnet/scenarios.json

@@ -89,7 +89,7 @@
         "features": {
             "dotnet": {
                 "version": "latest",
-                "workloads": "aspire, wasm-tools"
+                "workloads": "wasm-tools"
             }
         }
     }