From d37d5515f5b2d31b2875365dd724dd504e136a83 Mon Sep 17 00:00:00 2001
From: Patrick Vogelaar <patrick.vogelaar@belden.com>
Date: Tue, 9 Jan 2024 15:56:28 +0100
Subject: [PATCH] feat: set default time for initial startup

* all creation dates of the files are set to the 01.01. of the current year
* the file /usr/lib/clock-epoch is created. It is used by timedatectl to
  get the initial time and date (creation time of file).
* a sanity check was added to check if the hardcoded timestamp is outdated
---
 .../classes/coreos-sanity.bbclass               | 17 ++++++++++++++---
 .../conf/distro/belden-coreos.conf              |  5 +++++
 .../recipes-core/systemd/systemd_%.bbappend     | 10 ++++++++++
 3 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100644 layers/meta-belden-coreos/recipes-core/systemd/systemd_%.bbappend

diff --git a/layers/meta-belden-coreos/classes/coreos-sanity.bbclass b/layers/meta-belden-coreos/classes/coreos-sanity.bbclass
index 5c56e3c..44dcf15 100644
--- a/layers/meta-belden-coreos/classes/coreos-sanity.bbclass
+++ b/layers/meta-belden-coreos/classes/coreos-sanity.bbclass
@@ -13,6 +13,8 @@ addhandler check_coreos_sanity_eventhandler
 check_coreos_sanity_eventhandler[eventmask] = "bb.event.SanityCheck"
 python check_coreos_sanity_eventhandler() {
 
+    import datetime
+
     # Checks related to the distribution configuration files
     # ==========================================================================
 
@@ -29,13 +31,22 @@ python check_coreos_sanity_eventhandler() {
             "systemd is not set as `INIT_MANAGER`. "
             "Using SystemD is mandatory on CoreOS based distribution"
         )
-    
+
     if e.data.getVar("TCLIBC") != "glibc":
         bb.fatal(
             "glibc is not set as `TCLIBC`. "
             "Using glibc is mandatory on CoreOS based distribution"
         )
-    
+
+    # Check if the timestamp for REPRODUCIBLE_TIMESTAMP_ROOTFS is still up to date
+    first_of_year = datetime.datetime(datetime.date.today().year, 1, 1, tzinfo=datetime.timezone.utc)
+    foy_ts = str(int(first_of_year.timestamp()))
+    if e.data.getVar("REPRODUCIBLE_TIMESTAMP_ROOTFS") != foy_ts:
+        bb.warn(
+            "`REPRODUCIBLE_TIMESTAMP_ROOTFS` outdated!"
+            "Set to current 01. january of the year."
+        )
+
     # Checks related to the machine configuration files
     # ==========================================================================
 
@@ -47,7 +58,7 @@ python check_coreos_sanity_eventhandler() {
                 "CoreOS recommands to use compressed wic image, please add "
                 "`wic.xz` to your machine `IMAGE_FSTYPES` variables"
             )
-        
+
         if not "wic.bmap":
             bb.warn(
                 "wic image should be flashed with bmaptools, but this require "
diff --git a/layers/meta-belden-coreos/conf/distro/belden-coreos.conf b/layers/meta-belden-coreos/conf/distro/belden-coreos.conf
index 4eec78e..015caa3 100644
--- a/layers/meta-belden-coreos/conf/distro/belden-coreos.conf
+++ b/layers/meta-belden-coreos/conf/distro/belden-coreos.conf
@@ -7,3 +7,8 @@ MAINTAINER = "Belden CoreOS Team"
 
 DISTRO_VERSION = "0.0.1"
 DISTRO_CODENAME = "kirkstone"
+
+# This TS represents 01.01.2024 generating it dynamically would cause a lot of
+# things to get re-build, we need a good solution for this or change it every
+# year
+REPRODUCIBLE_TIMESTAMP_ROOTFS = "1704067200"
\ No newline at end of file
diff --git a/layers/meta-belden-coreos/recipes-core/systemd/systemd_%.bbappend b/layers/meta-belden-coreos/recipes-core/systemd/systemd_%.bbappend
new file mode 100644
index 0000000..18d1afc
--- /dev/null
+++ b/layers/meta-belden-coreos/recipes-core/systemd/systemd_%.bbappend
@@ -0,0 +1,10 @@
+
+do_install:append(){
+	# the creation date/time of this file will be used as initial boot time.
+	# Creation time will be set to REPRODUCIBLE_TIMESTAMP_ROOTFS
+	# More info about the date/time handling here:
+	# https://www.freedesktop.org/software/systemd/man/latest/systemd-timesyncd.service.html
+	touch ${D}/${base_libdir}/clock-epoch
+}
+
+FILES:${PN} += "${base_libdir}/clock-epoch"