Adjust permissions using umask in mkdir (#12207)

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# Description
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With this change, `mkdir` mirrors coreutils works. Closes #12161

I referred to the implementation of `mkdir` in uutils/coreutils. I add
`uucore` required for implementation to dependencies. Since `uucore` is
already included in dependencies of `uu_mkdir`, I don't think there will
be any additional dependencies.

# User-Facing Changes
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- Directories are created according to `umask` except for Windows.

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I add `mkdir` test considering permissions. The test assumes that the
default `umask` is `022`.

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Cargo.lock

@@ -2940,6 +2940,7 @@ dependencies = [
  "uu_mktemp",
  "uu_mv",
  "uu_whoami",
+ "uucore",
  "uuid",
  "v_htmlescape",
  "wax",

crates/nu-command/Cargo.toml

@@ -100,6 +100,9 @@ chardetng = "0.1.17"
 [target.'cfg(windows)'.dependencies]
 winreg = "0.52"
 
+[target.'cfg(not(windows))'.dependencies]
+uucore = { version = "0.0.24", features = ["mode"] }
+
 [target.'cfg(unix)'.dependencies]
 libc = "0.2"
 umask = "2.1"

crates/nu-command/src/filesystem/umkdir.rs

@@ -5,15 +5,25 @@ use nu_protocol::engine::{Command, EngineState, Stack};
 use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type};
 
 use uu_mkdir::mkdir;
+#[cfg(not(windows))]
+use uucore::mode;
 
 #[derive(Clone)]
 pub struct UMkdir;
 
 const IS_RECURSIVE: bool = true;
-// This is the same default as Rust's std uses:
-// https://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
 const DEFAULT_MODE: u32 = 0o777;
 
+#[cfg(not(windows))]
+fn get_mode() -> u32 {
+    DEFAULT_MODE - mode::get_umask()
+}
+
+#[cfg(windows)]
+fn get_mode() -> u32 {
+    DEFAULT_MODE
+}
+
 impl Command for UMkdir {
     fn name(&self) -> &str {
         "mkdir"
@@ -67,7 +77,7 @@ impl Command for UMkdir {
         }
 
         for dir in directories {
-            if let Err(error) = mkdir(&dir, IS_RECURSIVE, DEFAULT_MODE, is_verbose) {
+            if let Err(error) = mkdir(&dir, IS_RECURSIVE, get_mode(), is_verbose) {
                 return Err(ShellError::GenericError {
                     error: format!("{}", error),
                     msg: format!("{}", error),

crates/nu-command/tests/commands/umkdir.rs

@@ -122,3 +122,26 @@ fn creates_directory_three_dots_quotation_marks() {
         assert!(expected.exists());
     })
 }
+
+#[cfg(not(windows))]
+#[test]
+fn mkdir_umask_permission() {
+    use std::{fs, os::unix::fs::PermissionsExt};
+
+    Playground::setup("mkdir_umask_permission", |dirs, _| {
+        nu!(
+            cwd: dirs.test(),
+            "mkdir test_umask_permission"
+        );
+        let actual = fs::metadata(dirs.test().join("test_umask_permission"))
+            .unwrap()
+            .permissions()
+            .mode();
+
+        assert_eq!(
+            actual, 0o40755,
+            "Most *nix systems have 0o00022 as the umask. \
+            So directory permission should be 0o40755 = 0o40777 - 0o00022"
+        );
+    })
+}