Repository: sharkdp/fd (rust)

Issue:
fd cannot search files under a RAM disk
**Describe the bug you encountered:**

when performing search (e.g. `fd somepattern`) under a ramdisk (using ImDisk as RAM disk utility), the following error is returned immediately:

`[fd error] Cannot retrieve current directory (has it been deleted?)`

Instead, the builtin windows prompt command:
`dir /S /P somepattern`
works correctly.


**What version of `fd` are you using?**
8.2.1

**Which operating system / distribution are you on?**
Windows 8.1 x64


Pull request description:
is_dir: do not check for existence of directory
This fixes a bug on Windows where `fd` could not be used on ram disks
and encrypted folders.

closes #752

Patch:
diff --git a/Cargo.lock b/Cargo.lock
index 6dcf882..dede4b7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
@@ -166,6 +168,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "lscolors",
+ "normpath",
  "num_cpus",
  "regex",
  "regex-syntax",
@@ -330,6 +333,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "normpath"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27e6e8f70e9fbbe3752d330d769e3424f24b9458ce266df93a3b456902fd696a"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.13.0"
diff --git a/Cargo.toml b/Cargo.toml
index 7c93224..a4d479d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,6 +47,7 @@ lscolors = "0.7"
 globset = "0.4"
 anyhow = "1.0"
 dirs-next = "2.0"
+normpath = "0.3"
 
 [dependencies.clap]
 version = "2.31.2"
diff --git a/src/filesystem.rs b/src/filesystem.rs
index 19fc0e6..6680ae5 100644
--- a/src/filesystem.rs
+++ b/src/filesystem.rs
@@ -7,6 +7,8 @@ use std::io;
 use std::os::unix::fs::{FileTypeExt, PermissionsExt};
 use std::path::{Path, PathBuf};
 
+use normpath::PathExt;
+
 use crate::walk;
 
 pub fn path_absolute_form(path: &Path) -> io::Result<PathBuf> {
@@ -33,10 +35,10 @@ pub fn absolute_path(path: &Path) -> io::Result<PathBuf> {
     Ok(path_buf)
 }
 
-// Path::is_dir() is not guaranteed to be intuitively correct for "." and ".."
-// See: https://github.com/rust-lang/rust/issues/45302
-pub fn is_dir(path: &Path) -> bool {
-    path.is_dir() && (path.file_name().is_some() || path.canonicalize().is_ok())
+pub fn is_existing_directory(path: &Path) -> bool {
+    // Note: we do not use `.exists()` here, as `.` always exists, even if
+    // the CWD has been deleted.
+    path.is_dir() && (path.file_name().is_some() || path.normalize().is_ok())
 }
 
 #[cfg(any(unix, target_os = "redox"))]
diff --git a/src/main.rs b/src/main.rs
index 8a315a0..8654688 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,6 +21,7 @@ use atty::Stream;
 use globset::GlobBuilder;
 use lscolors::LsColors;
 use regex::bytes::{RegexBuilder, RegexSetBuilder};
+use normpath::PathExt;
 
 use crate::error::print_error;
 use crate::exec::CommandTemplate;
@@ -55,7 +56,7 @@ fn run() -> Result<ExitCode> {
     // Set the current working directory of the process
     if let Some(base_directory) = matches.value_of_os("base-directory") {
         let base_directory = Path::new(base_directory);
-        if !filesystem::is_dir(base_directory) {
+        if !filesystem::is_existing_directory(base_directory) {
             return Err(anyhow!(
                 "The '--base-directory' path '{}' is not a directory.",
                 base_directory.to_string_lossy()
@@ -70,7 +71,7 @@ fn run() -> Result<ExitCode> {
     }
 
     let current_directory = Path::new(".");
-    if !filesystem::is_dir(current_directory) {
+    if !filesystem::is_existing_directory(current_directory) {
         return Err(anyhow!(
             "Could not retrieve current directory (has it been deleted?)."
         ));
@@ -95,7 +96,7 @@ fn run() -> Result<ExitCode> {
         let mut directories = vec![];
         for path in paths {
             let path_buffer = PathBuf::from(path);
-            if filesystem::is_dir(&path_buffer) {
+            if filesystem::is_existing_directory(&path_buffer) {
                 directories.push(path_buffer);
             } else {
                 print_error(format!(
@@ -120,7 +121,7 @@ fn run() -> Result<ExitCode> {
             .iter()
             .map(|path_buffer| {
                 path_buffer
-                    .canonicalize()
+                    .normalize()
                     .and_then(|pb| filesystem::absolute_path(pb.as_path()))
                     .unwrap()
             })
@@ -130,7 +131,7 @@ fn run() -> Result<ExitCode> {
     // Detect if the user accidentally supplied a path instead of a search pattern
     if !matches.is_present("full-path")
         && pattern.contains(std::path::MAIN_SEPARATOR)
-        && filesystem::is_dir(Path::new(pattern))
+        && Path::new(pattern).is_dir()
     {
         return Err(anyhow!(
             "The search pattern '{pattern}' contains a path-separation character ('{sep}') \


Test patch:
diff --git a/tests/tests.rs b/tests/tests.rs
index 783420a..7fe2c70 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -5,6 +5,7 @@ use std::io::Write;
 use std::path::Path;
 use std::time::{Duration, SystemTime};
 
+use normpath::PathExt;
 use regex::escape;
 
 use crate::testenv::TestEnv;
@@ -26,8 +27,9 @@ static DEFAULT_FILES: &[&str] = &[
 fn get_absolute_root_path(env: &TestEnv) -> String {
     let path = env
         .test_root()
-        .canonicalize()
+        .normalize()
         .expect("absolute path")
+        .as_path()
         .to_str()
         .expect("string")
         .to_string();
@@ -1090,16 +1092,19 @@ fn test_symlink_as_root() {
 fn test_symlink_and_absolute_path() {
     let (te, abs_path) = get_test_env_with_abs_path(DEFAULT_DIRS, DEFAULT_FILES);
 
+    let expected_path = if cfg!(windows) { "symlink" } else { "one/two" };
+
     te.assert_output_subdirectory(
         "symlink",
         &["--absolute-path"],
         &format!(
-            "{abs_path}/one/two/c.foo
-            {abs_path}/one/two/C.Foo2
-            {abs_path}/one/two/three
-            {abs_path}/one/two/three/d.foo
-            {abs_path}/one/two/three/directory_foo",
-            abs_path = &abs_path
+            "{abs_path}/{expected_path}/c.foo
+            {abs_path}/{expected_path}/C.Foo2
+            {abs_path}/{expected_path}/three
+            {abs_path}/{expected_path}/three/d.foo
+            {abs_path}/{expected_path}/three/directory_foo",
+            abs_path = &abs_path,
+            expected_path = expected_path
         ),
     );
 }
@@ -1127,6 +1132,8 @@ fn test_symlink_and_full_path() {
     let root = te.system_root();
     let prefix = escape(&root.to_string_lossy());
 
+    let expected_path = if cfg!(windows) { "symlink" } else { "one/two" };
+
     te.assert_output_subdirectory(
         "symlink",
         &[
@@ -1135,10 +1142,11 @@ fn test_symlink_and_full_path() {
             &format!("^{prefix}.*three", prefix = prefix),
         ],
         &format!(
-            "{abs_path}/one/two/three
-            {abs_path}/one/two/three/d.foo
-            {abs_path}/one/two/three/directory_foo",
-            abs_path = &abs_path
+            "{abs_path}/{expected_path}/three
+            {abs_path}/{expected_path}/three/d.foo
+            {abs_path}/{expected_path}/three/directory_foo",
+            abs_path = &abs_path,
+            expected_path = expected_path
         ),
     );
 }