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There's a difference between
cmd | wc -l
and
x="$(cmd)"; echo "$x" | wc -l
in that the assignment in the latter removes a trailing newline **if one
exists**, but the "echo" always adds one. This means that if `cmd`
produces no output, the former has 0 lines, and the latter has 1 (empty)
line.
I've not found an easy way to fix this in a way that `wc` can tell the
difference between an empty line and a non-empty one, so I had to find a
separate way to count non-empty lines.
I did try `echo "$x" | grep . | wc -l`, but `shellcheck` complains with
[SC2126](https://github.com/koalaman/shellcheck/wiki/SC2126). The
suggested alternative, `echo "$x" | grep -c .`, causes a failure on
empty inputs (i.e. when there are no upgrades) because `grep` exits with
a failure status if no lines are selected.
My options were then to go with `grep | wc` and silence the warning, or
do `grep -c | cat` to mask the `grep` failure (again). Given that they
both have the same number of commands in the pipe, but `cat` is probably
*slightly* cheaper than `wc`, and the `cat` version doesn't require
adding a `shellcheck`-silencing comment, let's go with that.
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You have to explicitly enable it though
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Not "randomly" per se (see FixedRandomDelay docs in systemd.timer(7) for
more info) but don't have every user of this application all hammer the
repo exactly on the hour, every hour.
See variants on the "Thundering Herd" problem for more info.
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The notification is supposed to read "Reboot when it is convenient - to
install the updates", but I kept reading it as "Reboot - when it is
convenient to install the updates.", and I couldn't figure out the
"correct" punctuation to do that while remaining proper English. So move
the wording about instead.
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And document it, along with other installation instructions.
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So when you do `make PREFIX=/usr` and then `make install`, it installs
to `/usr`.
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Checking for new updates isn't resource-intensive, and the downloads
will happen one way or another - this just makes them happen sooner.
The main change here is that the desktop notification will happen
sooner, and once per hour. I think this is reasonable, as XDG
notifications don't interrupt the user's workflow, don't steal focus,
and don't even need to be dismissed. It's just a heads-up, and a
low-level reminder.
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Pipe success is determined by the success of the last command in the
pipe, and `grep` indicates failure if no lines were selected. If we
don't download anything then `grep` fails, the pipe fails, and the
script - due to `set -e` - then fails/aborts at that point.
So pipe through `cat` last, which always succeeds.
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Because if the network isn't available, it causes an abort. More details
in the README.md
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Don't care about the "Reading package lists..." and other interactive
fripperies, or the list of packages no longer required, or the full list
of packages to be upgraded, every time we just want to download new
updates. But logging the actual downloads is kinda useful, so keep
those.
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Cuts down on spam in the logs. See the debconf(7) man page for more
details.
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To allow for kernel upgrades, which install new packages.
Also, make the way we pass options to `apt-get upgrade` more consistent
between calls. Notably, put all options before the command, as indicated
by the apt-get(1) man page.
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So that an existing installation doesn't cause a new one to fail
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