[Bug 1852022] [NEW] casper's postponing of snap refresh broken by switch to busybox date

[Michael Hudson-Doyle]

Public bug reported:

Booting the latest focal live server daily gets us this:

Begin: Disabling snap refresh... ... date: unrecognized option '--iso-8601=seconds'
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu5) multi-call binary.

Usage: date [OPTIONS] [+FMT] [TIME]

Display time (using +FMT), or set time

	[-s,--set] TIME	Set time to TIME
	-u,--utc	Work in UTC (don't convert to local time)
	-R,--rfc-2822	Output RFC-2822 compliant date string
	-I[SPEC]	Output ISO-8601 compliant date string
			SPEC='date' (default) for date only,
			'hours', 'minutes', or 'seconds' for date and
			time to the indicated precision
	-r,--reference FILE	Display last modification time of FILE
	-d,--date TIME	Display TIME, not 'now'
	-D FMT		Use FMT for -d TIME conversion

Recognized TIME formats:
	hh:mm[:ss]
	[YYYY.]MM.DD-hh:mm[:ss]
	YYYY-MM-DD hh:mm[:ss]
	[[[[[YY]YY]MM]DD]hh]mm[.ss]
	'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead
done.

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: initramfs-tools (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1852022

Title:
  casper's postponing of snap refresh broken by switch to busybox date

Status in casper package in Ubuntu:
  New
Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  Booting the latest focal live server daily gets us this:

  Begin: Disabling snap refresh... ... date: unrecognized option '--iso-8601=seconds'
  BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu5) multi-call binary.

  Usage: date [OPTIONS] [+FMT] [TIME]

  Display time (using +FMT), or set time

  	[-s,--set] TIME	Set time to TIME
  	-u,--utc	Work in UTC (don't convert to local time)
  	-R,--rfc-2822	Output RFC-2822 compliant date string
  	-I[SPEC]	Output ISO-8601 compliant date string
  			SPEC='date' (default) for date only,
  			'hours', 'minutes', or 'seconds' for date and
  			time to the indicated precision
  	-r,--reference FILE	Display last modification time of FILE
  	-d,--date TIME	Display TIME, not 'now'
  	-D FMT		Use FMT for -d TIME conversion

  Recognized TIME formats:
  	hh:mm[:ss]
  	[YYYY.]MM.DD-hh:mm[:ss]
  	YYYY-MM-DD hh:mm[:ss]
  	[[[[[YY]YY]MM]DD]hh]mm[.ss]
  	'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead
  done.

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