From 96321f958cfed1a8bbe01f9e8268265fe436ade5 Mon Sep 17 00:00:00 2001
From: Joining7943 <111500881+Joining7943@users.noreply.github.com>
Date: Sun, 18 Sep 2022 17:00:43 +0200
Subject: [PATCH] tail: Fix random errors mainly on macos for piped input.
 Treat resolved paths to /dev/fd/0 as pipe.

Closes #3953
---
 src/uu/tail/src/paths.rs | 5 ++++-
 src/uu/tail/src/text.rs  | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/uu/tail/src/paths.rs b/src/uu/tail/src/paths.rs
index 0ebb265b2..203a23817 100644
--- a/src/uu/tail/src/paths.rs
+++ b/src/uu/tail/src/paths.rs
@@ -75,7 +75,10 @@ impl Input {
             }
             InputKind::File(_) | InputKind::Stdin => {
                 if cfg!(unix) {
-                    PathBuf::from(text::DEV_STDIN).canonicalize().ok()
+                    match PathBuf::from(text::DEV_STDIN).canonicalize().ok() {
+                        Some(path) if path != PathBuf::from(text::FD0) => Some(path),
+                        Some(_) | None => None,
+                    }
                 } else {
                     None
                 }
diff --git a/src/uu/tail/src/text.rs b/src/uu/tail/src/text.rs
index fba3968dd..62ad9cf70 100644
--- a/src/uu/tail/src/text.rs
+++ b/src/uu/tail/src/text.rs
@@ -18,3 +18,4 @@ pub static BACKEND: &str = "inotify";
 pub static BACKEND: &str = "kqueue";
 #[cfg(target_os = "windows")]
 pub static BACKEND: &str = "ReadDirectoryChanges";
+pub static FD0: &str = "/dev/fd/0";