From dd8affc6de5755e07638bf0a14382d29549d6ee9 Mon Sep 17 00:00:00 2001
From: Julien Blanc <julien.blanc@tgcm.eu>
Date: Tue, 1 Oct 2024 12:00:00 +0200
Subject: [PATCH] Fix current_zone not working on buildroot+glibc target - refs
 #846

The layout for timezones, on these targets, is
`/usr/share/zoneinfo/posix/Europe/Paris` instead of
`/usr/share/zoneinfo/Europe/Paris`.

`/usr/share/zoneinfo/Europe/Paris` exists and is a symlink to
`/usr/share/zoneinfo/posix/Europe/Paris`.

`/etc/localtime` correctly links to `/usr/share/zoneinfo/Europe/Paris`,
so `readlink` must be used instead of `realpath`.

Signed-off-by: Julien Blanc <julien.blanc@tgcm.eu>
---
 src/tz.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/tz.cpp b/src/tz.cpp
index 511b1dc..15c9f5d 100644
--- a/src/tz.cpp
+++ b/src/tz.cpp
@@ -4187,6 +4187,8 @@ sniff_realpath(const char* timezone)
     if (rp.get() == nullptr)
         throw system_error(errno, system_category(), "realpath() failed");
     auto result = extract_tz_name(rp.get());
+    if (result.find("posix") == 0)
+        return false;
     return result != "posixrules";
 }