fix: refactor setupPythonAndPip function

src/python/python.ts

@@ -14,6 +14,10 @@ import { setupDnfPack } from "../utils/setup/setupDnfPack"
 import { isUbuntu } from "../utils/env/isUbuntu"
 import { getExecOutput } from "@actions/exec"
 import { existsSync } from "fs"
+import { isBinUptoDate } from "../utils/setup/version"
+import { getVersion } from "../versions/versions"
+import assert from "assert"
+import execa from "execa"
 
 export async function setupPython(version: string, setupDir: string, arch: string) {
   if (ciDetect() !== "github-actions") {
@@ -78,6 +82,52 @@ export async function setupPythonViaSystem(
   }
 }
 
+let setupPythonAndPipTried = false
+
+/// setup python and pip if needed
+export async function setupPythonAndPip(): Promise<string> {
+  let foundPython: string
+
+  // install python
+  if (which.sync("python3", { nothrow: true }) !== null) {
+    foundPython = "python3"
+  } else if (which.sync("python", { nothrow: true }) !== null && (await isBinUptoDate("python", "3.0.0"))) {
+    foundPython = "python"
+  } else {
+    info("python3 was not found. Installing python")
+    await setupPython(getVersion("python", undefined), "", process.arch)
+    // try again
+    if (setupPythonAndPipTried) {
+      throw new Error("Failed to install python")
+    }
+    setupPythonAndPipTried = true
+    return setupPythonAndPip() // recurse
+  }
+
+  assert(typeof foundPython === "string")
+
+  // install pip
+  if (process.platform === "win32") {
+    // downgrade pip on Windows
+    // https://github.com/pypa/pip/issues/10875#issuecomment-1030293005
+    execa.sync(foundPython, ["-m", "pip", "install", "-U", "pip==21.3.1"], { stdio: "inherit" })
+  } else if (process.platform === "linux") {
+    // ensure that pip is installed on Linux (happens when python is found but pip not installed)
+    if (isArch()) {
+      setupPacmanPack("python-pip")
+    } else if (hasDnf()) {
+      setupDnfPack("python3-pip")
+    } else if (isUbuntu()) {
+      await setupAptPack("python3-pip")
+    }
+  }
+
+  // install wheel (required for Conan, Meson, etc.)
+  execa.sync(foundPython, ["-m", "pip", "install", "-U", "wheel"], { stdio: "inherit" })
+
+  return foundPython
+}
+
 export async function addPythonBaseExecPrefix(python: string) {
   let dirs: string[] = []
 

src/utils/setup/setupPipPack.ts

@@ -1,60 +1,18 @@
 /* eslint-disable require-atomic-updates */
 import execa from "execa"
-import which from "which"
 import { info } from "@actions/core"
-import { addPythonBaseExecPrefix, setupPython } from "../../python/python"
-import { isBinUptoDate } from "./version"
-import { getVersion } from "../../versions/versions"
+import { addPythonBaseExecPrefix, setupPythonAndPip } from "../../python/python"
 import { InstallationInfo } from "./setupBin"
-import { setupAptPack } from "./setupAptPack"
-import { setupPacmanPack } from "./setupPacmanPack"
-import { isArch } from "../env/isArch"
-import { isUbuntu } from "../env/isUbuntu"
-import { hasDnf } from "../env/hasDnf"
-import { setupDnfPack } from "./setupDnfPack"
 
 let python: string | undefined
 let binDir: string | undefined
 
-let tried = false
-
 /** A function that installs a package using pip */
 export async function setupPipPack(name: string, version?: string): Promise<InstallationInfo> {
   info(`Installing ${name} ${version ?? ""} via pip`)
 
-  // setup python and pip if needed
   if (python === undefined) {
-    if (which.sync("python3", { nothrow: true }) !== null) {
-      python = "python3"
-    } else if (which.sync("python", { nothrow: true }) !== null && (await isBinUptoDate("python", "3.0.0"))) {
-      python = "python"
-    } else {
-      info("python3 was not found. Installing python")
-      await setupPython(getVersion("python", undefined), "", process.arch)
-      // try again
-      if (tried) {
-        throw new Error("Failed to install python")
-      }
-      tried = true
-      return setupPipPack(name, version)
-    }
-    if (process.platform === "win32") {
-      // downgrade pip on Windows
-      // https://github.com/pypa/pip/issues/10875#issuecomment-1030293005
-      execa.sync(python, ["-m", "pip", "install", "-U", "pip==21.3.1"], { stdio: "inherit" })
-    } else if (process.platform === "linux") {
-      // ensure that pip is installed on Linux (happens when python is found but pip not installed)
-      if (isArch()) {
-        setupPacmanPack("python-pip")
-      } else if (hasDnf()) {
-        setupDnfPack("python3-pip")
-      } else if (isUbuntu()) {
-        await setupAptPack("python3-pip")
-      }
-    }
-
-    // install wheel (required for Conan, Meson, etc.)
-    execa.sync(python, ["-m", "pip", "install", "-U", "wheel"], { stdio: "inherit" })
+    python = await setupPythonAndPip()
   }
 
   execa.sync(python, ["-m", "pip", "install", version !== undefined && version !== "" ? `${name}==${version}` : name], {