fix: use the user profile to add system environment variables

Author: aminya

dist/setup_cpp.js

@@ -4,6 +4,8 @@ import execa from "execa"
 import { isGitHubCI } from "./isci"
 import untildify from "untildify"
 import { appendFileSync } from "fs"
+import { join } from "path"
+import { isRoot } from "./sudo"
 
 /** An add path function that works locally or inside GitHub Actions */
 export function addEnv(name: string, val: string | undefined) {
@@ -33,7 +35,13 @@ function addEnvSystem(name: string, val: string | undefined) {
     }
     case "linux":
     case "darwin": {
-      const profile_path = untildify("~/.profile")
+      // find profile path
+      let profile_path = untildify("~/.profile")
+      if (isRoot() && typeof process.env.SUDO_USER === "string") {
+        // use the user profile even if root
+        profile_path = join("/home/", process.env.SUDO_USER, ".profile")
+      }
+
       appendFileSync(profile_path, `\nexport ${name}="${val}"\n`)
       core.info(`${name}="${val} was added to "${profile_path}"`)
       return