[aur-general] Why /etc/issue starts with invisible chars?
roman.kyrylych at gmail.com
Fri Mar 21 04:00:26 EDT 2008
2008/3/21, Lyman <lymanrb at gmail.com>:
> Hi, all
> I found this issue when I was trying Sysmonitor in the package
> screenlets because Sysmonitor can not show my distribution name correctly.
> At the beginning I thought that it was a bug of screenlets, however,
> when I dug into its source code, I realized that it could be a "bug"
> introduced by Archlinux because the /etc/issue starts with some
> invisible chars.
> Here's the hexdump of /etc/issue in Archlinux. It is obviously that the
> first line in this file is not the distribution name.
> 00000000 1b 5b 48 1b 5b 32 4a 0a 41 72 63 68 20 4c 69 6e
> |.[H.[2J.Arch Lin|
> 00000010 75 78 20 28 43 6f 72 65 20 44 75 6d 70 29 20 20 |ux (Core
> Dump) |
> 00000020 5c 72 20 20 28 5c 6e 29 20 28 5c 6c 29 0a 0a |\r (\n)
> I've checked other two distribution, CentOS and Ubuntu (that's all I
> have at the moment), both of them presents the their name in the first line.
> I guess most of the applications just use the first line in /etc/issue
> as distribution name (so do screenlets). I think Archlinux should comply
> with "Rule of Least Surprise" on this issue. If the invisible chars are
> just for clearing screen, we can do that from the second line.
We already do. :-)
/etc/issue is *not* a way to check for distribution name. Apps that do
this are wrong.
Most distros have /etc/distroname-release files as well (that contain
the version, that's why it's empty in Arch).
Good written apps check for *existence* of /etc/arch-release file to
know whether they are on Arch Linux.
See virtualbox's installer for example how a check for distribution
should be made.
Roman Kyrylych (Роман Кирилич)
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