Bug#939733: lsb-release: lsb_release does not show point release on Debian 10.1

[Dmitry Bogatov]

control: severity -1 +normal

[2019-09-10 10:21] Jonathan Wiltshire <jmw at tiger-computing.co.uk>
> >> The x.y there was a remnant from Debian sarge times.
> > 
> > Up until squeeze I have seen it show x.y.z, then from wheezy to
> > stretch I see only x.y, but it does seem new behaviour in buster to
> > only show x.
> > 
> > $ ansible '*' -i inventories/testing -a 'lsb_release -d' | grep ^Descr | sort -u
> > Description:    Debian GNU/Linux 10 (buster)
> > Description:    Debian GNU/Linux 8.11 (jessie)
> > Description:    Debian GNU/Linux 9.10 (stretch)
>
> This stems from lsb_release switching to reading the cross-distro
> standard file, /usr/lib/os-release:
>
> | $ cat /etc/debian_version
> | 10.1
> | $ cat /usr/lib/os-release
> | PRETTY_NAME="Debian GNU/Linux 10 (buster)"
> | NAME="Debian GNU/Linux"
> | VERSION_ID="10"
> | VERSION="10 (buster)"

As pointed by maintainer of base-files, this format of
/usr/lib/os-release is with us for some time (just checked on stretch
box).

In theory, I can revert #914287, but is it good thing? Actually, I fail
to see the whole point of `lsb_release` command. You can't squash all
information in your /etc/apt/sources.list into two digits.

This said, I feel current behaviour more logical. LSB pretends to
provide cross-distributions interface, so reading /usr/lib/os-release
feels more natural than /etc/debian_release.
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