(repo tooling): cannot install with dotnet 9

[kirkwaiblinger]

Describe the bug

when running yarn build as a new contributor, and installing dotnet in order to address the build requirements check, I get

Checking dotnet version... Found dotnet version 9.0.100 [/usr/local/share/dotnet/sdk]. Install dotnet >= 6.0.100

9.9.100 is plainly >= 6.0.100, so I propose the erorr message be updated to match the actual requirements in order to make setup accessible for new contributors.

Related: #17605

Regression Issue

• Select this option if this issue appears to be a regression.

Last Known Working CDK Version

No response

Expected Behavior

No error, or error message like

Checking dotnet version... Found dotnet version 9.0.100 [/usr/local/share/dotnet/sdk]. Install dotnet >= 6.0.100 and < 9

Current Behavior

Checking dotnet version... Found dotnet version 9.0.100 [/usr/local/share/dotnet/sdk]. Install dotnet >= 6.0.100

Reproduction Steps

yarn build on a machine with dotnet == 9.0.100

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

n/a. This is on main, commit 0153da4

Framework Version

No response

Node.js Version

v22.11.0

OS

macos

Language

TypeScript

Language Version

n/a

Other information

It would also be helpful if the error message when dotnet is missing gave mentioned referring to the CONTRIBUTING.md for .NET SDK installation instructions. I searched for dotnet in CONTRIBUTING.md and found nothing.

[kirkwaiblinger]

Oh, it would also be helpful if the gitpod instructions were mentioned before the Quick Start instructions. That's a great feature for contributors, but I didn't know it to use it because I was trying to follow the directions in order 🤦‍♂️

[ashishdhingra]

Reproducible (also when executing scripts/check-build-prerequisites.sh)

Checking if node is installed... Ok
Checking node version... Ok
Checking if yarn is installed... Ok
Checking yarn version... Ok
Checking if docker is installed... Ok
Checking if Docker is running... Ok
Checking if dotnet is installed... Ok
Checking dotnet version... Found dotnet version 9.0.100 [/local/home/ashdhin/.dotnet/sdk]. Install dotnet >= 6.0.100
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Need to modify RegEx at

aws-cdk/scripts/check-build-prerequisites.sh

Line 130 in 2eebc59

if [ $(echo $app_v | grep -c -E "[678]\.[0-9]+\.[0-9]+") -eq 1 ]

.

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