From b8b3ad550d2367f1b82f2812259d88edecd858c4 Mon Sep 17 00:00:00 2001
From: hygienic-books <hygienic-books@tentic.net>
Date: Sat, 6 May 2023 19:49:35 +0200
Subject: [PATCH] feat(script): Write snapshot time in a user-configurable time
 zone (#1)

---
 pacman-zfs-snapshot.conf | 7 +++++++
 pacman-zfs-snapshot.sh   | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/pacman-zfs-snapshot.conf b/pacman-zfs-snapshot.conf
index 78e598f..dae37d0 100644
--- a/pacman-zfs-snapshot.conf
+++ b/pacman-zfs-snapshot.conf
@@ -42,6 +42,13 @@ snap_name_prefix='pacman'
 # We do "$(date +<whatever>)" to put a timestamp into snapshot names.
 # Defaults to "$(date +'%F-%H%M')" which returns '2023-03-07-0050'.
 snap_date_format='%F-%H%M'
+# The tzdata-formatted timezone name used to add timestamps to snapshot
+# names. Check for example 'timedatectl list-timezones' to get a list of
+# valid names on your system. Format looks like 'America/Fortaleza',
+# 'Asia/Magadan' or 'Australia/Sydney'. Defaults to 'Etc/UTC'. Can also be
+# the empty string (as in snap_timezone='') in which case we'll use your
+# system's timezone setting.
+snap_timezone='Etc/UTC'
 
 # Which strings do we want to diffferentiate pacman operations Install,
 # Remove, Upgrade
diff --git a/pacman-zfs-snapshot.sh b/pacman-zfs-snapshot.sh
index 4ea0b6c..46517cc 100755
--- a/pacman-zfs-snapshot.sh
+++ b/pacman-zfs-snapshot.sh
@@ -25,6 +25,7 @@ snap_only_local_datasets="${snap_only_local_datasets:-true}"
 snap_field_separator="${snap_field_separator:-_}"
 snap_name_prefix="${snap_name_prefix:-pacman}"
 snap_date_format="${snap_date_format:-%F-%H%M}"
+snap_timezone="${snap_timezone:-Etc/UTC}"
 snap_op_installation_suffix="${snap_op_installation_suffix:-inst}"
 snap_op_remove_suffix="${snap_op_remove_suffix:-rmvl}"
 snap_op_upgrade_suffix="${snap_op_upgrade_suffix:-upgr}"
@@ -309,7 +310,7 @@ function main () {
     write_pkg_list_oneline
 
     local date_string max_dataset_name_length
-    date_string="$(date +"${snap_date_format}")"
+    date_string="$($([[ "${snap_timezone}" ]] && printf -- 'export TZ='"${snap_timezone}"); date +"${snap_date_format}")"
     find_max_dataset_name_length
 
     local trimmed_pkg_list_oneline