fix: append update-alternatives to cpprc instead

src/utils/env/addEnv.ts

@@ -45,7 +45,7 @@ export function addPath(path: string) {
   }
 }
 
-const cpprc_path = untildify(".cpprc")
+export const cpprc_path = untildify(".cpprc")
 
 function addEnvSystem(name: string, valGiven: string | undefined) {
   const val = valGiven ?? ""
@@ -96,7 +96,7 @@ function addPathSystem(path: string) {
 let setupCppInProfile_called = false
 
 /// handles adding conditions to source .cpprc file from .bashrc and .profile
-function setupCppInProfile() {
+export function setupCppInProfile() {
   if (setupCppInProfile_called) {
     return
   }

src/utils/setup/setupAptPack.ts

@@ -3,6 +3,9 @@ import { InstallationInfo } from "./setupBin"
 import { execSudo } from "../exec/sudo"
 import { info } from "@actions/core"
 import { warning } from "../io/io"
+import { isGitHubCI } from "../env/isci"
+import { cpprc_path, setupCppInProfile } from "../env/addEnv"
+import { appendFileSync } from "fs"
 
 let didUpdate: boolean = false
 let didInit: boolean = false
@@ -70,5 +73,13 @@ export async function setupAptPack(
 }
 
 export function updateAptAlternatives(name: string, path: string) {
+  if (isGitHubCI()) {
     return execSudo("update-alternatives", ["--install", `/usr/bin/${name}`, name, path, "10"])
+  } else {
+    setupCppInProfile()
+    return appendFileSync(
+      cpprc_path,
+      `\nif [ $UID -eq 0 ]; then update-alternatives --install /usr/bin/${name} ${name} ${path} 10; fi\n`
+    )
+  }
 }