[PATCH] base-files: fix zoneinfo support

[Rosen Penev]

The system init script currently sets /tmp/localinfo when zoneinfo is
populated. However, zoneinfo has spaces in it whereas the actual files
have _ instead of spaces. This made the if condition never return true.

Example failure when removing the if condition:

/tmp/localtime -> /usr/share/zoneinfo/America/Los Angeles

This file does not exist. America/Los_Angeles does.

Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 this should be backported to 21.02 and 19.07 as the issue is also
 present there. This was tested on 19.07.
 package/base-files/files/etc/init.d/system | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/package/base-files/files/etc/init.d/system b/package/base-files/files/etc/init.d/system
index 08cf86b97f..b1fc154cec 100755
--- a/package/base-files/files/etc/init.d/system
+++ b/package/base-files/files/etc/init.d/system
@@ -22,9 +22,13 @@ system_config() {
 
 	echo "$hostname" > /proc/sys/kernel/hostname
 	[ -z "$conloglevel" -a -z "$buffersize" ] || dmesg ${conloglevel:+-n $conloglevel} ${buffersize:+-s $buffersize}
-	echo "$timezone" > /tmp/TZ
-	[ -n "$zonename" ] && [ -f "/usr/share/zoneinfo/$zonename" ] && \
-		ln -sf "/usr/share/zoneinfo/$zonename" /tmp/localtime && rm -f /tmp/TZ
+	if [ -n "$zonename" ]; then
+		local zname=$(echo "$zonename" | tr ' ' _)
+		[ -f "/usr/share/zoneinfo/$zname" ] && \
+			ln -sf "/usr/share/zoneinfo/$zname" /tmp/localtime
+	else
+		echo "$timezone" > /tmp/TZ
+	fi
 
 	# apply timezone to kernel
 	hwclock -u --systz
-- 
2.30.2