From 0ea59dbd2e63ba059ac9fd52c2f1e24658e672d0 Mon Sep 17 00:00:00 2001
From: Chris Novakovic <chris@chrisn.me.uk>
Date: Wed, 8 Oct 2025 20:23:08 +0100
Subject: [PATCH] Writer: don't prepend file mode bits to file mode field

ar archives are only capable of storing regular files, so the file mode
bits that `Reader` prepends to every file mode header field are
redundant (and it forces users to strip them off manually whenever a
file header passes through a `Writer` multiple times, otherwise they
accumulate and overflow the header field). Just encode the mode we were
given - which may or may not contain file mode bits of its own, at the
caller's discretion - in octal and insert it into the header field.
---
 writer.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/writer.go b/writer.go
index a7b1d5d..4981d28 100644
--- a/writer.go
+++ b/writer.go
@@ -81,7 +81,7 @@ func (aw *Writer) numeric(b []byte, x int64) {
 }
 
 func (aw *Writer) octal(b []byte, x int64) {
-	s := "100" + strconv.FormatInt(x, 8)
+	s := strconv.FormatInt(x, 8)
 	for len(s) < len(b) {
 		s = s + " "
 	}