From fc6c17b83887ef193f2b97264b1843c94dcb915d Mon Sep 17 00:00:00 2001
From: 0xb10c <b10c@b10c.me>
Date: Tue, 13 Jun 2023 14:33:58 +0200
Subject: build: make sure we can overwrite config.{guess,sub}

Since ea7b8528 (#26422), autogen.sh overwrites the
build-aux/config.{guess, sub} files (installed there by autoreconf)
with the depends/config.{guess, sub} files if these are newer.

The autoreconf tool copies them from it's share/autoconf/build-aux/
directory. Specifically on NixOS, the share/autoconf/build-aux/
files are located in the nix-store and are read-only. autoreconf
preserves the read-only permissions when copying. Overwriting them
with our depends/config.{guess, sub} subsequently fails.

To make sure we can overwrite the files, we set write permissions to
the current user and group before overwriting. This fixes the problem
on NixOS.

fixes #27873: Can't copy to 'build-aux/config.guess' in autoconf.sh: Permission denied
---
 autogen.sh | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'autogen.sh')

diff --git a/autogen.sh b/autogen.sh
index d0ac7ef7ed..69c892ffa0 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -16,10 +16,14 @@ command -v autoreconf >/dev/null || \
 autoreconf --install --force --warnings=all
 
 if expr "'$(build-aux/config.guess --timestamp)" \< "'$(depends/config.guess --timestamp)" > /dev/null; then
+  chmod ug+w build-aux/config.guess
+  chmod ug+w src/secp256k1/build-aux/config.guess
   cp depends/config.guess build-aux
   cp depends/config.guess src/secp256k1/build-aux
 fi
 if expr "'$(build-aux/config.sub --timestamp)" \< "'$(depends/config.sub --timestamp)" > /dev/null; then
+  chmod ug+w build-aux/config.sub
+  chmod ug+w src/secp256k1/build-aux/config.sub
   cp depends/config.sub build-aux
   cp depends/config.sub src/secp256k1/build-aux
 fi
-- 
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