Hi,
I have a Nexus 4 now to test the printing stack on the phone.
First I have updated the USB-connected phone to the development branch
of the OS via
ubuntu-device-flash touch --channel=devel
with the phone booted into Ubuntu and the screen unlocked.
After the reboot of the phone I have run
phablet-config writable-image
to be able to install packages with apt-get and entered a shell on the
phone via
phablet-shell
In the shell I first installed a level-1 printing stack (See
https://blueprints.launchpad.net/ubuntu/+spec/client-1305-printing-stack-with-mobile-in-mind
for the levels):
sudo apt-get install cups-daemon cups-browsed avahi-daemon
This makes the following new packages getting installed:
The following NEW packages will be installed:
avahi-daemon bc bind9-host cups-browsed cups-daemon libavahi-core7
libavahi-glib1 libbind9-90 libcupsmime1 libdaemon0 libdns100 libgeoip1
libisc95 libisccc90 libisccfg90 liblwres90 libpaper1 ssl-cert
0 upgraded, 18 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,502 kB of archives.
After this operation, 4,698 kB of additional disk space will be used.
The installation was hanging on the postinst of CUPS, so I had to open a
new shell in another terminal and kill the postinst for the installation
process to finish.
sudo apt-get install -f
has re-run the CUPS postinst and this time it finished.
As the phone apps do not yet have a print dialog I needed a print client
on the phone, and also some tools for developing and debugging. So I
have installed cups-client, giving me command line printing and print
admin commands, as lp, lpstat, lpinfo, lpadmin, ...:
sudo apt-get install cups-client
[...]
The following NEW packages will be installed:
cups-client cups-common libcupsfilters1 libcupsimage2
0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 368 kB of archives.
After this operation, 2,810 kB of additional disk space will be used.
PID 1 on the phone is still Upstart, Upstart is configured to start CUPS
on-demand, via
/etc/init/cups.override
cups.override needs to be corrected, as cupsd does not support the "-x"
option any more, so I have removed the "-x 30" from the cupsd command
line. Now cupsd starts when running commands like
lpstat -r
lpstat -v
...
After that I did
sudo start cups-browsed
to start cups-browsed to get the queues from remote CUPS servers locally
available (level 1 printing stack).
lpstat -v
shows my printers shared on remote CUPS servers now.
Note that CUPS admin tasks need "sudo" as the "phablet" user is not in
the "lpadmin" group.
For the printing tests I do the CUPS logging (in
/var/log/cups/error_log) in debug mode, running
sudo cupsctl --debug-logging
sudo cupsctl
shows my settings.
Now I print via
lp -d printer ~/.bashrc
CUPS is now supposed to send the job via IPP (Internet Printing
Protocol) to the remote CUPS server where the printer is actually
connected to. This it does using a backend, a small helper program, in
our case /usr/lib/cups/backend/ipps.
Printing does not work yet:
1. CUPS reports exit status 127 on the ipps backend call (command not
found, the fact that in error_log you see "file too large" is a CUPS
bug, exit status 127 is command not found), but the backend is called
with its full path, the backend is actually present and executable, no
libs missing (checked with "ldd"), the backend works directly called
from the command line.
2. No name resolution in the local network (avahi problem? avahi-daemon
is running). Manual call of the backend only works if the host name in
the device URI is replaced by the corresponding IP address.
So following command prints:
DEVICE_URI=ipps://192.168.0.11:631/printers/printer
CONTENT_TYPE=text/plain /usr/lib/cups/backend/ipps 1 1 1 1 "" ~/.bashrc
Also
sudo DEVICE_URI=ipps://192.168.0.11:631/printers/printer
CONTENT_TYPE=text/plain /usr/lib/cups/backend/ipps 1 1 1 1 "" ~/.bashrc
prints.
Has someone of you any idea how to solve the two mentioned problems, the
"command not found" if the backend is called from within CUPS and the
host name resolution not working.
Any help is much appreciated.
Till
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