Fix 'doctor' command failing at Cocoapods stage when user uses ASDF.

If the user is using ASDF the 'doctor' command may fail at the Cocoapods stage as it will be using the global tool definitions instead of those specified by the project (if any).  This fixes the problem by generating a .tool-versions file with the correct settings in the temp directory used for the Cocoapods test.

Author: apburgess

packages/doctor/src/sys-info.ts

@@ -424,6 +424,29 @@ export class SysInfo implements NativeScriptDoctor.ISysInfo {
 						tempDirectory,
 					);
 					const xcodeProjectDir = path.join(tempDirectory, "cocoapods");
+
+					// If ADSF version manager is installed, get the config for the project directory and write it to the temporary project directory
+					const asdfResult = await this.childProcess.spawnFromEvent(
+						"asdf",
+						["list", "ruby"],
+						"exit",
+					);
+					const asdfVersionMatch = (asdfResult.stdout as string).match(
+						SysInfo.VERSION_REGEXP,
+					);
+
+					if (asdfVersionMatch?.[0]) {
+						const asdfVersion = asdfVersionMatch[0];
+						const asdfConfigPath = path.join(xcodeProjectDir, ".tool-versions");
+						const wroteASDFConfig = this.fileSystem.appendFile(
+							asdfConfigPath,
+							`ruby ${asdfVersion}`,
+						);
+						if (!wroteASDFConfig) {
+							console.warn(`Cocoapods invocation may fail, check asdf config`);
+						}
+					}
+
 					const spawnResult = await this.childProcess.spawnFromEvent(
 						"pod",
 						["install"],
@@ -432,6 +455,7 @@ export class SysInfo implements NativeScriptDoctor.ISysInfo {
 					);
 					return !spawnResult.exitCode;
 				} catch (err) {
+					console.log(`Pod command failed - ${err}`);
 					return false;
 				} finally {
 					this.fileSystem.deleteEntry(tempDirectory);

packages/doctor/src/wrappers/file-system.ts

@@ -8,6 +8,17 @@ export class FileSystem {
 		return fs.existsSync(path.resolve(filePath));
 	}
 
+	public appendFile(filePath: string, text: string): boolean {
+		let success = false;
+		try {
+			fs.appendFileSync(path.resolve(filePath), text);
+			success = true;
+		} catch (err) {
+			console.error(`appendFile failed with ${err}`);
+		}
+		return success;
+	}
+
 	public extractZip(pathToZip: string, outputDir: string): Promise<void> {
 		return new Promise((resolve, reject) => {
 			yauzl.open(
@@ -46,7 +57,7 @@ export class FileSystem {
 					zipFile.once("end", () => resolve());
 
 					zipFile.readEntry();
-				}
+				},
 			);
 		});
 	}
@@ -57,7 +68,7 @@ export class FileSystem {
 
 	public readJson<T>(
 		filePath: string,
-		options?: { encoding?: null; flag?: string }
+		options?: { encoding?: null; flag?: string },
 	): T {
 		const content = fs.readFileSync(filePath, options);
 		return JSON.parse(content.toString());