Hi,
On 9/4/20 18:16, Didier Kryn wrote:
Le 09/04/2020 à 16:13, dal a écrit :
Hello and thanks for Beowulf.
An issue:
it looks like
devuan_beowulf_3.0.0_beta_amd64_netinstall.iso
and the base system installable from it
do not contain the ifupdown package (nor other networking utilities
besides busybox ip?).
The resulting base installation remains offline.
This is a more limited definition of a "base system" than it used to
be, most probably unintentionally.
I remember this was also the case in a previous version, wether
Jessie or Ascii. Obviously this isn't an issue when upgrading. I also
remind you that the startup delay caused by the timed-out activation
of the Ethernet interface (when not plugged in) is still there with
the default interfaces file. The solution is to remove the clause
"allow-hotplug eth0" and install ifupdown or the equivalent I have
forgotten the name of.
Didier
The origin of the startup delay is in the lock_interface() function of
ifupdown in the main.c file:
https://github.com/wido/ifupdown/blob/master/main.c
between the lines nº196-209, surely because ifupdown is trying to lock
both wired and wireless devices
at the same time that some dhcp client (isc-dhcp-client, dhcpcd5,
udhcpc...) is trying to connect (in vain) to some of them,
being these resources busy. The C function used during the lock attempts
is *fcntl* which uses the following macros:
Macro: /int/ *F_SETLK*
whose error conditions are defined by EACCES in GNU/Linux and
EAGAIN in GNU/Hurd.
Macro: /int/ *F_SETLKW (= F_SETLK + Wait)
*
which causes the process to block (or wait) until the request can be
specified (line nº199 in main.c).
Read here for more details:
https://www.gnu.org/software/libc/manual/html_node/File-Locks.html
I replaced this code by an unique line:
int flags = fcntl(fileno(lock_fp), F_SETLK, &lock);
and the delay disappears (the same effect than removing "allow-hotplug"
from /etc/network/interfaces.
As a final remark, the "auto <device>" stanza seems to be deprecated,
but some people still use it. In the case of
having both defined, that is:
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
the clause "allow-hotplug" has priority over "auto"; so, using both at
the same time makes no sense.
You can download the patched packages from here:
http://packages.gnuinos.org/?dir=gnuinos/pool/main/i/ifupdown
Cheers,
Aitor.
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