From ab6cd4229b19542a2941e5aa2c3de107902ee952 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Tue, 9 Feb 2021 13:08:18 +0100
Subject: [PATCH] pxar: skip write_attr_fd if they are equal

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
 src/pxar/metadata.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/pxar/metadata.rs b/src/pxar/metadata.rs
index 8d24d85f..6e87db3d 100644
--- a/src/pxar/metadata.rs
+++ b/src/pxar/metadata.rs
@@ -363,6 +363,11 @@ fn apply_chattr(fd: RawFd, chattr: libc::c_long, mask: libc::c_long) -> Result<(
     }
 
     let attr = (chattr & mask) | (fattr & !mask);
+
+    if attr == fattr {
+        return Ok(());
+    }
+
     match unsafe { fs::write_attr_fd(fd, &attr) } {
         Ok(_) => Ok(()),
         Err(nix::Error::Sys(errno)) if errno_is_unsupported(errno) => Ok(()),