common-utils overwrites .zshrc coming from image built (#1069)

* common-utils overwrites .zshrc coming from image built with common-utils already

* version bumped and added scenario to test the user issue

* cp command failing fix test

* bump version reverted

* fixed the pipeline failures

* discarded diff logic and introduced new one

* Update src/common-utils/main.sh

* instead of overwritting, template file will be appended to existing .zshrc file if INSTALL_OH_MY_ZSH_CONFIG is true

* removed if statement to check .zshrc file exists

* if condition added to check user_rc_file exist

* linter error fixed

* optimize duplication for template_path and user_rc_file logic

---------
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

src/common-utils/devcontainer-feature.json

 {
     "id": "common-utils",
-    "version": "2.4.5",
+    "version": "2.4.6",
     "name": "Common Utilities",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/common-utils",
     "description": "Installs a set of common command line utilities, Oh My Zsh!, and sets up a non-root user.",

src/common-utils/main.sh

@@ -491,7 +491,6 @@ if [ "${INSTALL_ZSH}" = "true" ]; then
         echo 'source $HOME/.profile' >> "${user_home}/.zprofile" # TODO: Reconsider adding '.profile' to '.zprofile'
         chown ${USERNAME}:${group_name} "${user_home}/.zprofile"
     fi
-
     if [ "${ZSH_ALREADY_INSTALLED}" != "true" ]; then
         if [ "${ADJUSTED_ID}" = "rhel" ]; then
              global_rc_path="/etc/zshrc"
@@ -543,7 +542,8 @@ if [ "${INSTALL_ZSH}" = "true" ]; then
 
         # Add devcontainer .zshrc template
         if [ "$INSTALL_OH_MY_ZSH_CONFIG" = "true" ]; then
-            echo -e "$(cat "${template_path}")\nDISABLE_AUTO_UPDATE=true\nDISABLE_UPDATE_PROMPT=true" > ${user_rc_file}
+            template_code="$(cat "${template_path}")\nDISABLE_AUTO_UPDATE=true\nDISABLE_UPDATE_PROMPT=true"
+            echo -e "$([ -f "${user_rc_file}" ] && cat "${user_rc_file}")\n${template_code}" > "${user_rc_file}"
             sed -i -e 's/ZSH_THEME=.*/ZSH_THEME="devcontainers"/g' ${user_rc_file}
         fi
 

test/common-utils/devcontainer-ruby-zshrc.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "configure-zshrc-without-overwrite" bash -c "grep 'rbenv init -' ~/.zshrc"
+
+# Report result
+reportResults

test/common-utils/devcontainer-ruby-zshrc/Dockerfile

+FROM mcr.microsoft.com/devcontainers/ruby:3.2
+
+RUN echo 'eval "$(rbenv init -)"' >> /home/vscode/.zshrc
+

test/common-utils/devcontainer-ruby-zshrc/meta.env

+VERSION='test-version'
+DEFINITION_ID='test-id'
+VARIANT='test-variant'
+GIT_REPOSITORY='test-repository'
+GIT_REPOSITORY_RELEASE='test-release'
+GIT_REPOSITORY_REVISION='test-revision'
+BUILD_TIMESTAMP='test-time'
+CONTENTS_URL='test-url'

test/common-utils/scenarios.json

@@ -235,6 +235,24 @@
             }
         }
     },
+    "devcontainer-ruby-zshrc": {
+        "build": {
+            "dockerfile": "Dockerfile"
+        },
+        "remoteUser": "vscode",
+        "features": {
+            "common-utils": {
+                "installZsh": true,
+                "username": "vscode",
+                "userUid": "1000",
+                "userGid": "1000",
+                "upgradePackages": true,
+                "installOhMyZsh": true,
+                "installOhMyZshConfig": true,
+                "configureZshAsDefaultShell": true
+            }
+        }
+    },
     "alpine-base-zsh-default": {
         "image": "mcr.microsoft.com/devcontainers/base:alpine",
         "remoteUser": "vscode",