[openwrt/openwrt] base-files: fix /tmp/TZ when zoneinfo not installed

[LEDE Commits]

aparcar pushed a commit to openwrt/openwrt.git, branch openwrt-19.07:
https://git.openwrt.org/71fa524e1bef2b266d9ed3ee94c2b7ff9d8e59b0

commit 71fa524e1bef2b266d9ed3ee94c2b7ff9d8e59b0
Author: Paul Spooren <mail at aparcar.org>
AuthorDate: Thu Jun 24 07:42:53 2021 -1000

    base-files: fix /tmp/TZ when zoneinfo not installed
    
    The zoneinfo packages are not installed per default so neither
    /tmp/localtime nor /tmp/TZ is generated.
    
    This patch mostly reverts the previous fix and instead incooperates a
    solution suggested by Jo.
    
    Fixes "base-files: fix zoneinfo support " 8af62ed
    
    Signed-off-by: Paul Spooren <mail at aparcar.org>
    (cherry picked from commit 56bdb6bb9781f8a0bbec5fc3075b9d2b8d12f9a8)
---
 package/base-files/files/etc/init.d/system | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/package/base-files/files/etc/init.d/system b/package/base-files/files/etc/init.d/system
index 219b29812d..62cf2db3dd 100755
--- a/package/base-files/files/etc/init.d/system
+++ b/package/base-files/files/etc/init.d/system
@@ -21,13 +21,10 @@ system_config() {
 
 	echo "$hostname" > /proc/sys/kernel/hostname
 	[ -z "$conloglevel" -a -z "$buffersize" ] || dmesg ${conloglevel:+-n $conloglevel} ${buffersize:+-s $buffersize}
-	rm -f /tmp/TZ
-	if [ -n "$zonename" ]; then
-		local zname=$(echo "$zonename" | tr ' ' _)
-		[ -f "/usr/share/zoneinfo/$zname" ] && ln -sf "/usr/share/zoneinfo/$zname" /tmp/localtime
-	else
-		echo "$timezone" > /tmp/TZ
-	fi
+	echo "$timezone" > /tmp/TZ
+	[ -n "$zonename" ] && [ -f "/usr/share/zoneinfo/${zonename// /_}" ] \
+		&& ln -sf "/usr/share/zoneinfo/${zonename// /_}" /tmp/localtime \
+		&& rm -f /tmp/TZ
 
 	# apply timezone to kernel
 	date -k