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`which` has been deprecated in debianutils 5.0+. The recommended
replacement, `command -v`, is mandated by Debian policy these days, in
addition to being required by POSIX and its predecessor specs at least
since 1994.
Not found commands cause no output from `command -v` per POSIX, so
remove the redundant 2>&1's while at it.
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If on_ac_power exits with 255 the script would fail at this point
because set -e was set, but it should continue, as 255 means the
power status could not be determined.
LP: #1742378
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.. instead of hardcoding the functionnality in the apt.systemd.daily
script.
Also make the compatibility cron job provide the same functionnality
for systems that do not use systemd.
Closes: #827930
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The rational is that we need to spread the load on the mirrors
that apt update and unattended-upgrades cause. To do so, we
leverage the RandomizeDelay feature of systemd. The other advantage
is that the timer is not run at a fixed daily.daily time but
instead every 24h. This also fixes the problem that the randomized
deplay in the current apt.cron.daily causes other cron jobs to
be deplayed.
A compatibility cron job is also provided for systems that do not
use systemd.
Note that the time is fired two times a day, but the logic inside
of apt.systemd.daily will ensure (via stamp files) that the
servers are hit at most every 24h. Firing two times a day helps
with the worst case update time and it also helps with systems
that are not always on.
LP: #246381, #727685
Closes: #600262, #709675, #663290
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