Add git version check before using system git (#93)

src/utils/gitUtil.mts

@@ -7,9 +7,31 @@ import { SettingsKey, HOME_VAR } from "../settings.mjs";
 import { homedir } from "os";
 import which from "which";
 import { window } from "vscode";
+import { compareGe } from "./semverUtil.mjs";
 
 export const execAsync = promisify(exec);
 
+export const MIN_GIT_VERSION="2.28.0";
+
+export async function checkGitVersion(gitExecutable: string):
+  Promise<[boolean, string]> 
+{
+  const versionCommand =
+    `${
+      process.env.ComSpec === "powershell.exe" ? "&" : ""
+    }"${gitExecutable}" version`;
+  const ret = await execAsync(versionCommand)
+  const regex = /git version (\d+\.\d+(\.\d+)*)/;
+  const match = regex.exec(ret.stdout);
+  if (match && match[1]) {
+    const gitVersion = match[1];
+
+    return [compareGe(gitVersion, MIN_GIT_VERSION), gitVersion]; 
+  } else {
+    return [false, "unknown"];
+  }
+}
+
 /**
  * Get installed version of git, and install it if it isn't already
  */
@@ -19,6 +41,14 @@ export async function getGit(settings: Settings): Promise<string | undefined> {
       .getString(SettingsKey.gitPath)
       ?.replace(HOME_VAR, homedir().replaceAll("\\", "/")) || "git";
   let gitPath = await which(gitExecutable, { nothrow: true });
+  let gitVersion: string | undefined;
+  if (gitPath !== null) {
+    const versionRet = await checkGitVersion(gitPath);
+    if (!versionRet[0]) {
+      gitPath = null;
+    }
+    gitVersion = versionRet[1];
+  }
   if (gitPath === null) {
     // if git is not in path then checkForInstallationRequirements
     // maye downloaded it, so reload
@@ -27,12 +57,23 @@ export async function getGit(settings: Settings): Promise<string | undefined> {
       .getString(SettingsKey.gitPath)
       ?.replace(HOME_VAR, homedir().replaceAll("\\", "/"));
     if (gitExecutable === null || gitExecutable === undefined) {
-      Logger.log("Error: Git not found.");
-
-      await window.showErrorMessage(
-        "Git not found. Please install and add to PATH or " +
-          "set the path to the git executable in global settings."
-      );
+      if (gitVersion !== undefined) {
+        Logger.log(`Error: Found Git version ${gitVersion} - ` +
+          `requires ${MIN_GIT_VERSION}.`);
+
+        await window.showErrorMessage(
+          `Found Git version ${gitVersion}, but requires ${MIN_GIT_VERSION}. ` +
+          "Please install and add to PATH or " +
+            "set the path to the git executable in global settings."
+        );
+      } else {
+        Logger.log("Error: Git not found.");
+
+        await window.showErrorMessage(
+          "Git not found. Please install and add to PATH or " +
+            "set the path to the git executable in global settings."
+        );
+      }
 
       return undefined;
     } else {

src/utils/requirementsUtil.mts

@@ -5,6 +5,7 @@ import { SettingsKey, HOME_VAR } from "../settings.mjs";
 import { homedir } from "os";
 import { downloadGit } from "./downloadGit.mjs";
 import Logger, { LoggerSource } from "../logger.mjs";
+import { checkGitVersion, MIN_GIT_VERSION } from "./gitUtil.mjs";
 
 /**
  * Shows an error message that the requirements for development are not met
@@ -37,6 +38,12 @@ export async function checkForGit(settings: Settings): Promise<boolean> {
   const git: string | null = await which(gitExe, { nothrow: true });
 
   let isGitInstalled = git !== null;
+  let gitVersion: string | undefined;
+  if (git !== null) {
+    const ret = await checkGitVersion(git);
+    isGitInstalled = ret[0];
+    gitVersion = ret[1];
+  }
   if (!isGitInstalled) {
     // try to install
     const gitDownloaded: string | undefined = await downloadGit();
@@ -45,6 +52,17 @@ export async function checkForGit(settings: Settings): Promise<boolean> {
       // if git is downloaded set custom git path
       await settings.updateGlobal(SettingsKey.gitPath, gitDownloaded);
       isGitInstalled = true;
+    } else if (gitVersion !== undefined) {
+      Logger.error(
+        LoggerSource.requirements,
+        "Installed Git is too old and a new version could not be downloaded."
+      );
+      void window.showErrorMessage(
+        "The installation of the Pico SDK requires Git " +
+          `version ${MIN_GIT_VERSION} or higher ` +
+          "to be installed and available in the PATH - " +
+          `you have version ${gitVersion}.`
+      );
     } else {
       Logger.error(
         LoggerSource.requirements,