Bug#1124737: /usr/bin/timedatectl: timedatectl lists timezones that are not installed and cannot be set

[Saikrishna Arcot]

Package: systemd
Version: 257.9-1~deb13u1
Severity: normal
File: /usr/bin/timedatectl
Tags: upstream
X-Debbugs-Cc: sarcot at microsoft.com

Dear Maintainer,

The command "timedatectl list-timezones" lists timezones that are not present in the tzdata package.
The timezones in questions are legacy timezones that have been split off into the tzdata-legacy
package. However, those timezones are listed in /usr/share/zoneinfo/tzdata.zi, which timedatectl is
reading.

This has been fixed upstream in systemd 259, specifically with this[1] change. It has also been reported
in Ubuntu here[2]. This bug report request is to backport the change to stable.

[1] https://github.com/systemd/systemd/commit/9fe168a92c87d9b2def3a18d54b0b62c04c4aee0
[2] https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2125405

-- Package-specific info:

-- System Information:
Debian Release: 13.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.41+deb13-sonic-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages systemd depends on:
ii  libacl1            2.3.2-2+b1
ii  libapparmor1       4.1.0-1
ii  libc6              2.41-12
ii  libmount1          2.41-5
ii  libpam0g           1.7.0-5
ii  libseccomp2        2.6.0-2
ii  libselinux1        3.8.1-1
ii  libssl3t64         3.5.4-1+fips
ii  libsystemd-shared  257.9-1~deb13u1
ii  libsystemd0        257.9-1~deb13u1
ii  mount              2.41-5

Versions of packages systemd recommends:
ii  chrony [time-daemon]            4.6.1-3
ii  dbus [default-dbus-system-bus]  1.16.2-2
ii  linux-sysctl-defaults           4.12
pn  systemd-cryptsetup              <none>

Versions of packages systemd suggests:
pn  libtss2-tcti-device0  <none>
pn  polkitd               <none>
pn  systemd-boot          <none>
pn  systemd-container     <none>
pn  systemd-homed         <none>
pn  systemd-repart        <none>
pn  systemd-resolved      <none>
pn  systemd-userdbd       <none>

Versions of packages systemd is related to:
pn  dbus-user-session  <none>
pn  dracut             <none>
ii  initramfs-tools    0.142
pn  libnss-systemd     <none>
ii  libpam-systemd     257.9-1~deb13u1
ii  udev               257.9-1~deb13u1

-- Configuration Files:
/etc/systemd/journald.conf changed [not included]
/etc/systemd/networkd.conf changed [not included]

-- no debconf information