[base-ubuntu] - remove existing ubuntu user (devcontainers#1170)

* [base-ubuntu, dotnet] - del existing ubuntu user

* few changes

* few more changes miscellaneous

* misc. changes

* changes to kill process running on 1000 before assigning to vscode user

* more change to assign 1000 to vscode

* small change

* changes as suggested !

* few changes for testing ..

* small change

* few changes..

* reverting dotnet changes..

* changes as suggested

* chg

* Update test.sh

* changed test - check for ubuntu user after deletion added

* changes as discussed in review comment

* changes as required

* changes suggested

Author: gauravsaini04

src/base-ubuntu/.devcontainer/Dockerfile

@@ -3,6 +3,15 @@ FROM buildpack-deps:${VARIANT}-curl
 
 LABEL dev.containers.features="common"
 
+ARG VARIANT
+RUN if [ "$VARIANT" = "noble" ]; then \
+        if id "ubuntu" &>/dev/null; then \
+            echo "Deleting user 'ubuntu'  for $VARIANT" && userdel -f -r ubuntu || echo "Failed to delete ubuntu user for $VARIANT"; \  
+        else \
+            echo "User 'ubuntu' does not exist for $VARIANT"; \ 
+        fi; \
+    fi
+
 # [Optional] Uncomment this section to install additional OS packages.
 # RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
 #     && apt-get -y install --no-install-recommends <your-package-list-here>

src/base-ubuntu/.devcontainer/devcontainer.json

@@ -7,6 +7,8 @@
         "ghcr.io/devcontainers/features/common-utils:2": {
             "installZsh": "true",
             "username": "vscode",
+			"userUid": "1000",
+			"userGid": "1000",
             "upgradePackages": "true"
         },
         "ghcr.io/devcontainers/features/git:1": {

src/base-ubuntu/test-project/test.sh

@@ -19,7 +19,21 @@ check "gitconfig-file-location" sh -c "ls /etc/gitconfig"
 check "gitconfig-contains-name" sh -c "cat /etc/gitconfig | grep 'name = devcontainers'"
 check "usr-local-etc-config-does-not-exist" test ! -f "/usr/local/etc/gitconfig"
 
-check "uid" bash -c "id -u vscode | grep 1001" 
+check_ubuntu_user() {
+    if ! id -u ubuntu > /dev/null 2>&1; then
+        echo -e "✔️   User ubuntu does not exist."
+    else
+        echo -e "❌   User ubuntu exists."
+        exit 1;
+    fi
+}
+
+if grep -q 'VERSION_CODENAME=noble' /etc/os-release; then
+    echo -e "\nThe base image is ubuntu:noble. Checking user Ubuntu.."
+    check "uid" "check_ubuntu_user"
+else
+    echo -e "\nCannot check user Ubuntu. The base image is not ubuntu:noble."
+fi
 
 # Report result
 reportResults