.NET 8 installation fails

[doublecompile]

Describe the bug
.NET 8.0 fails to install on a simple Linux CodeBuild project.

To Reproduce
Steps to reproduce the behavior:

Use the following standard buildspec.yml

version: 0.2
phases:
  install:
    runtime-versions:
      dotnet: "8.0"

Expected behavior
Latest version of .NET 8 installs.

Logs

[Container] 2025/03/14 14:08:52.147224 Selecting 'dotnet' runtime version '8.0' based on manual selections...
[Container] 2025/03/14 14:08:52.147880 Running command echo "Installing custom .Net version 8.0 ..."
Installing custom .Net version 8.0 ...
[Container] 2025/03/14 14:08:52.155641 Running command /usr/local/bin/dotnet-install.sh -v 8.0 && rm -rf /tmp/*
dotnet-install: Attempting to download using primary link https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0/dotnet-sdk-8.0-linux-x64.tar.gz
curl: (22) The requested URL returned error: 404
dotnet-install: The resource at primary link 'https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0/dotnet-sdk-8.0-linux-x64.tar.gz' is not available.
dotnet-install: Attempting to download using primary link https://ci.dot.net/public/Sdk/8.0/dotnet-sdk-8.0-linux-x64.tar.gz
curl: (22) The requested URL returned error: 404
dotnet-install: The resource at primary link 'https://ci.dot.net/public/Sdk/8.0/dotnet-sdk-8.0-linux-x64.tar.gz' is not available.
dotnet_install: Error: Could not find `.NET Core SDK` with version = 8.0
dotnet_install: Error: Refer to: https://aka.ms/dotnet-os-lifecycle for information on .NET Core support
[Container] 2025/03/14 14:08:58.278143 Command did not exit successfully /usr/local/bin/dotnet-install.sh -v 8.0 && rm -rf /tmp/* exit status 1
[Container] 2025/03/14 14:08:58.279003 Phase complete: DOWNLOAD_SOURCE State: FAILED
[Container] 2025/03/14 14:08:58.279017 Phase context status code: COMMAND_EXECUTION_ERROR Message: Error while installing runtimes.

Platform (please complete the following information):

• OS: Linux x86

I've temporarily changed this to the following, which seems to work.

phases:
  install:
    commands:
      curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel 8.0

The logs for this output:

[Container] 2025/03/14 14:27:55.511010 Running command curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel 8.0
dotnet-install: Attempting to download using aka.ms link https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.407/dotnet-sdk-8.0.407-linux-x64.tar.gz
dotnet-install: Remote file https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.407/dotnet-sdk-8.0.407-linux-x64.tar.gz size is 212950827 bytes.
dotnet-install: Extracting archive from https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.407/dotnet-sdk-8.0.407-linux-x64.tar.gz
dotnet-install: Downloaded file size is 212950827 bytes.
dotnet-install: The remote and local file sizes are equal.
dotnet-install: Installed version is 8.0.407
dotnet-install: Adding to current process PATH: `/root/.dotnet`. Note: This change will be visible only when sourcing script.
dotnet-install: Note that the script does not resolve dependencies during installation.
dotnet-install: To check the list of dependencies, go to https://learn.microsoft.com/dotnet/core/install, select your operating system and check the "Dependencies" section.
dotnet-install: Installation finished successfully.

[doublecompile]

I also noted this on dotnet/core#9799.

[doublecompile]

Sigh. False alarm. It turns out the build project was using standard:6.0 instead of standard:7.0. Using the standard:7.0 image with the runtime-versions statement works as expected.

Closing.