fix permission errors are swallowed by fs.copy() (#3504)

std/fs/copy.ts

@@ -23,21 +23,25 @@ async function ensureValidCopy(
   options: CopyOptions,
   isCopyFolder = false
 ): Promise<Deno.FileInfo> {
-  const destStat: Deno.FileInfo | null = await Deno.lstat(dest).catch(
-    (): Promise<null> => Promise.resolve(null)
-  );
+  let destStat: Deno.FileInfo | null;
 
-  if (destStat) {
-    if (isCopyFolder && !destStat.isDirectory()) {
-      throw new Error(
-        `Cannot overwrite non-directory '${dest}' with directory '${src}'.`
-      );
-    }
-    if (!options.overwrite) {
-      throw new Error(`'${dest}' already exists.`);
+  try {
+    destStat = await Deno.lstat(dest);
+  } catch (err) {
+    if (err instanceof Deno.DenoError && err.kind == Deno.ErrorKind.NotFound) {
+      return;
     }
   }
 
+  if (isCopyFolder && !destStat.isDirectory()) {
+    throw new Error(
+      `Cannot overwrite non-directory '${dest}' with directory '${src}'.`
+    );
+  }
+  if (!options.overwrite) {
+    throw new Error(`'${dest}' already exists.`);
+  }
+
   return destStat!;
 }
 
@@ -51,19 +55,19 @@ function ensureValidCopySync(
 
   try {
     destStat = Deno.lstatSync(dest);
-  } catch {
-    // ignore error
+  } catch (err) {
+    if (err instanceof Deno.DenoError && err.kind == Deno.ErrorKind.NotFound) {
+      return;
+    }
   }
 
-  if (destStat!) {
-    if (isCopyFolder && !destStat!.isDirectory()) {
-      throw new Error(
-        `Cannot overwrite non-directory '${dest}' with directory '${src}'.`
-      );
-    }
-    if (!options.overwrite) {
-      throw new Error(`'${dest}' already exists.`);
-    }
+  if (isCopyFolder && !destStat!.isDirectory()) {
+    throw new Error(
+      `Cannot overwrite non-directory '${dest}' with directory '${src}'.`
+    );
+  }
+  if (!options.overwrite) {
+    throw new Error(`'${dest}' already exists.`);
   }
 
   return destStat!;
@@ -186,6 +190,7 @@ function copyDirSync(src: string, dest: string, options: CopyOptions): void {
 
 /**
  * Copy a file or directory. The directory can have contents. Like `cp -r`.
+ * Requires the `--allow-read` and `--alow-write` flag.
  * @param src the file/directory path.
  *            Note that if `src` is a directory it will copy everything inside
  *            of this directory, not the entire directory itself
@@ -224,6 +229,7 @@ export async function copy(
 
 /**
  * Copy a file or directory. The directory can have contents. Like `cp -r`.
+ * Requires the `--allow-read` and `--alow-write` flag.
  * @param src the file/directory path.
  *            Note that if `src` is a directory it will copy everything inside
  *            of this directory, not the entire directory itself

std/fs/ensure_dir.ts

@@ -1,49 +1,49 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { getFileInfoType } from "./utils.ts";
+const { lstat, lstatSync, mkdir, mkdirSync, ErrorKind } = Deno;
+
 /**
  * Ensures that the directory exists.
  * If the directory structure does not exist, it is created. Like mkdir -p.
+ * Requires the `--allow-read` and `--alow-write` flag.
  */
 export async function ensureDir(dir: string): Promise<void> {
-  let pathExists = false;
   try {
-    // if dir exists
-    const stat = await Deno.stat(dir);
-    pathExists = true;
-    if (!stat.isDirectory()) {
+    const fileInfo = await lstat(dir);
+    if (!fileInfo.isDirectory()) {
       throw new Error(
-        `Ensure path exists, expected 'dir', got '${getFileInfoType(stat)}'`
+        `Ensure path exists, expected 'dir', got '${getFileInfoType(fileInfo)}'`
       );
     }
   } catch (err) {
-    if (pathExists) {
-      throw err;
+    if (err instanceof Deno.DenoError && err.kind === ErrorKind.NotFound) {
+      // if dir not exists. then create it.
+      await mkdir(dir, true);
+      return;
     }
-    // if dir not exists. then create it.
-    await Deno.mkdir(dir, true);
+    throw err;
   }
 }
 
 /**
  * Ensures that the directory exists.
  * If the directory structure does not exist, it is created. Like mkdir -p.
+ * Requires the `--allow-read` and `--alow-write` flag.
  */
 export function ensureDirSync(dir: string): void {
-  let pathExists = false;
   try {
-    // if dir exists
-    const stat = Deno.statSync(dir);
-    pathExists = true;
-    if (!stat.isDirectory()) {
+    const fileInfo = lstatSync(dir);
+    if (!fileInfo.isDirectory()) {
       throw new Error(
-        `Ensure path exists, expected 'dir', got '${getFileInfoType(stat)}'`
+        `Ensure path exists, expected 'dir', got '${getFileInfoType(fileInfo)}'`
       );
     }
   } catch (err) {
-    if (pathExists) {
-      throw err;
+    if (err instanceof Deno.DenoError && err.kind == ErrorKind.NotFound) {
+      // if dir not exists. then create it.
+      mkdirSync(dir, true);
+      return;
     }
-    // if dir not exists. then create it.
-    Deno.mkdirSync(dir, true);
+    throw err;
   }
 }

std/fs/ensure_file.ts

@@ -2,6 +2,7 @@
 import * as path from "../path/mod.ts";
 import { ensureDir, ensureDirSync } from "./ensure_dir.ts";
 import { getFileInfoType } from "./utils.ts";
+const { lstat, lstatSync, writeFile, writeFileSync, ErrorKind } = Deno;
 
 /**
  * Ensures that the file exists.
@@ -9,27 +10,28 @@ import { getFileInfoType } from "./utils.ts";
  * exist.
  * these directories are created. If the file already exists,
  * it is NOTMODIFIED.
+ * Requires the `--allow-read` and `--alow-write` flag.
  */
 export async function ensureFile(filePath: string): Promise<void> {
-  let pathExists = false;
   try {
     // if file exists
-    const stat = await Deno.lstat(filePath);
-    pathExists = true;
+    const stat = await lstat(filePath);
     if (!stat.isFile()) {
       throw new Error(
         `Ensure path exists, expected 'file', got '${getFileInfoType(stat)}'`
       );
     }
   } catch (err) {
-    if (pathExists) {
-      throw err;
-    }
     // if file not exists
-    // ensure dir exists
-    await ensureDir(path.dirname(filePath));
-    // create file
-    await Deno.writeFile(filePath, new Uint8Array());
+    if (err instanceof Deno.DenoError && err.kind === ErrorKind.NotFound) {
+      // ensure dir exists
+      await ensureDir(path.dirname(filePath));
+      // create file
+      await writeFile(filePath, new Uint8Array());
+      return;
+    }
+
+    throw err;
   }
 }
 
@@ -39,26 +41,26 @@ export async function ensureFile(filePath: string): Promise<void> {
  * exist,
  * these directories are created. If the file already exists,
  * it is NOT MODIFIED.
+ * Requires the `--allow-read` and `--alow-write` flag.
  */
 export function ensureFileSync(filePath: string): void {
-  let pathExists = false;
   try {
     // if file exists
-    const stat = Deno.statSync(filePath);
-    pathExists = true;
+    const stat = lstatSync(filePath);
     if (!stat.isFile()) {
       throw new Error(
         `Ensure path exists, expected 'file', got '${getFileInfoType(stat)}'`
       );
     }
   } catch (err) {
-    if (pathExists) {
-      throw err;
-    }
     // if file not exists
-    // ensure dir exists
-    ensureDirSync(path.dirname(filePath));
-    // create file
-    Deno.writeFileSync(filePath, new Uint8Array());
+    if (err instanceof Deno.DenoError && err.kind === ErrorKind.NotFound) {
+      // ensure dir exists
+      ensureDirSync(path.dirname(filePath));
+      // create file
+      writeFileSync(filePath, new Uint8Array());
+      return;
+    }
+    throw err;
   }
 }