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Osmarender Tweaks

I have made a couple of simple tweaks to the Osmarender rules and styles: Red Arrows for Oneway Streets, Residential Buildings, Hiking Trails. Images included!

TODO: make it easy to render it yourself.

Coordinates:

50.1375; 14.5120

OpenStreetMap Diaries via a GeoRSS Box Filter

OpenStreetMap has this nice feed of its users' diaries, so that you can get all excited about the progress that fellow mappers have done near you. Now if you actually try to follow that feed, you may notice, as did I, that the problem is in the word near, which is the missing piece. It does not help to learn about new developments on another continent.
Fortunately (and unsurprisingly) the feed is GeoRSS so we can filter its contents based on the coordinates supplied with most diary entries. I did not find such service on the Web so I wrote it myself: a GeoRSS Box Filter. You say geofilter.php?url=...&minlat=...&maxlat=...&minlong=...&maxlong=... and it filters the given feed according to the given bounding box. If you omit the url, it defaults to the above mentioned OSM diary feed, and the bounding box defaults to Czechoslovakia.
More examples? How about the United Kingdom? or Georgia? (The Export tab is handy to get the numbers, BTW) To watch for uploaded GPS traces, use geofilter.php?url=http://openstreetmap.org/traces/rss. I wonder what other interesting feeds you can find to experiment with (but I did not try anything else than RSS 2.0).
Oh, and I worked on this all on the company time because it's Hack Week₃ now, yay!

cnetworkmanager 0.7.1

Cnetworkmanager is a command-line client for NetworkManager, intended to supplement and replace the GUI applets. So far it is a single python script. What is new in version 0.7.1:

• it does not need a configuration file anymore:
  cnetworkmanager -C publicnet
cnetworkmanager -C myessid --wep-hex 112234445566778899aabbccdd
cnetworkmanager -C another --wpa-psk-hex \
 112233445566778899aabbccddeeff00112233445566778899aabbccddeeff00
• it works with NM 0.6 (tested on Ubuntu 8.04 Hardy and a pre-release OLPC) in addition to the older support for NM 0.7pre (tested on openSUSE 11.0)
  

What is still left to do:

• sooner:
• specifying the key as a non-hex passphrase
• reading the configuration stored by the GNOME nm-applet
• possibility to quit after a connection is established
• later:
• more encryption schemes (WPA2?)
• more connection types (dial-up, VPN)

Cultural Exchange 4: First YaST

Managed to compile and run YaST up to nfs-client and ntp-client. Of course it does not work properly, but makes for a nice Potemkin hamlet.

Fresh libzypp needs cmake 2.6 but there is only 2.4 in .debs. Fortunately the cmake authors provide a binary tarball with 2.6, only one has to know where to put the contained directories.

Notes for clean-up: Libzypp should say it needs hal-storage and boost-filesystem too. Python-bindings should check for python-dev, should use python-config. Perl does not seem to respect vendor_arch for ycp.pm?

Cultural Exchange 3: First .deb

Started to build YaST. Managed to compile yast2-core. Now going to make it repeatable by properly packaging the dependencies. The first one is blocxx. Bleeding edge stuff is in the Build Service: home:mvidner:debian. The post How to make debian standard debs from scratch was much helpful.

Tried to print and failed miserably. The setup tool would not work with a remote CUPS printer, kept asking for my password. Switching AppArmor from enforcement to complain mode did not help, nor did disabling it.

The development package for openssl is libssl-dev (openSUSE: libopenssl-devel). http://packages.debian.org/ helps with that.

Perl packages, named perl-Foo-Bar on openSUSE, are usually named libfoo-bar-perl on Debian.

Packaging system started to complain that packages cannot be verified.

(Cultural Exchange is my long term project of working with Ubuntu instead of openSUSE. TODO: make a permanent index page.)

YaST Workshop 2008

We had the annual YaST workshop last week. The people in the team boldly went to explore new APIs and one of the results is experimental integration of PolicyKit into YaST. If you really want to break your system, you can try the current code.

Cultural Exchange 2

Gnome would crash before the panel would show up. Also, the text console did not work (graphic artifacts instead). Failsafe Gnome did work, which does not have Compiz, so I took a hint to change the graphics driver. System / Management / Hardware drivers offered me to install the non-free xorg-driver-fglrx and now it works.

command-not-found is enabled out of the box and it rules. openSUSE should have it by default too.

dpkg phrasebook:

rpm -ql foo

dpkg -L foo

rpm -qa "foo*bar"

dpkg -l "foo*bar" (and it also shows packages that are not installed)

Cultural Exchange: First Blood

I decided to expand my horizons and install Ubuntu on my main work computer. So today I offer you the first notes from my observations.

mutt somehow stopped tracking new mails. Fortunately :set check_mbox_size on works around that.

My subversion working copy from openSUSE was created with svn 1.5 but Hardy has only 1.4. So I manually got debs from the coming Intrepid release, and luckily 3 of them were enough: dpkg -i {subversion,libsvn1,libneon27-gnutls}*.deb from here and here.

LinDevDoc Got Tagging

Bluebear has improved LinDevDoc (original announcement) so that it can do tags now.

Addressing Lines in Plain Text Files

Jirka suggested a possibility to enhance YCP documentation with real-life code examples. For that, we'd need to point to numbered lines within the source code. I thought that ViewVC can do it but apparently not (maybe annotate has it, but it is broken at our site). But there is a new generic way: RFC 5147: URI Fragment Identifiers for the text/plain Media Type. Only none of the browsers seems to support it today...

This points to line 13, with the prototype of main:

http://svn.opensuse.org/svn/yast/trunk/libyui/examples/HelloWorld.cc#line=,13

Medoosa in OBS

Medoosa is a documentation tool for C++ that can produce UML class diagrams including generalizations and associations. Corrections can be made interactively in a diagram editor (Dia) and are fed back into the source as Javadoc-style comments. At this time, the layout must still be done by hand. Some code is already present to produce the layout with Graphviz.

I wrote it for my master's thesis at the Charles University back in 2001 and it has been since then quietly sitting at SourceForge. Today I have rebuilt it in the openSUSE Build Service: Medoosa, CcDoc-0.7a (required).

cnetworkmanager 0.4

I pulled together 0.4 yesterday:

• New: changed license to GPLv2 or later, to match other parts of NM
• New: distinguish WEP, WPA, WPA2 for -n.
• New: -o, -w control online and WiFi status.
• New: basic device info for NM 0.6
• Fix: recognize Notification Messages in knetwormanagerrc.
• Fix: -u: better error message when applet not running.
• Fix: standardized option parsing, both -Cfoo and -C foo work.

The software is now hosted in a Git repository.

KNotify Client

Korshak asked how to do emerge -uND --world && knotify "Done!". I thougt it would be a piece of cake, but apparently not.
The short answer, zypper in libnotify; notify-send Done, has a disadvantage of requiring a fair amount of GNOME software. But it does use a proposed freedesktop.org standard.
Then I find the method org.kde.KNotify.event, but its nice signature (ssavsayasx) means dbus-send (dbus-1-1.2.1-12) cannot invoke it (it cannot pass empty arrays, and it cannot wrap variants in arrays). No problem, let's use Python. But then we are blocked by knotify4 (kdebase4-runtime-4.0.4-19) reporting a wrong signature via the introspection interface.

# killall knotify4; cp /usr/bin/knotify4{,.bak}
# sed 's/type="a(ss)"/ type = "av"/g' /usr/bin/knotify4.bak > /usr/bin/knotify4

Now which event should we use so that the user actually sees the message? There are many of them, with user configurable actions. warning/kde seems to work out of the box.

#! /usr/bin/python
import sys
import dbus
m = sys.argv[1]
kn = dbus.SessionBus().get_object("org.kde.knotify", "/Notify")
i = kn.event("warning", "kde", [], m, [0,0,0,0], [], 0,
    dbus_interface="org.kde.KNotify")


That did it. But I still hope that there is a simple solution for KDE4 that I have missed.

D-Bus Spy

Like dbus-monitor, it monitors the system or session bus. Additionally, it can write the traffic to a file and read it later (-w, -r). It can dump all the gory details (-d) or pretty print all the gory details (-p). Like DBusMessageBox which inspired it, it can make message sequence charts (-c). It has some simple filtering abilities (-f, -F).

Try 0.1 if that sounds interesting.

try cnetworkmanager 0.3

cnetworkmanager is a command line interface for Network Manager. It is still lacking many features but I decided to announce it now, when it can:

1. connect to WiFi networks
2. read the configuration file of KNetworkManager

It is working for me on RC1 of openSUSE-11.0, which has NetworkManager-0.7.0.r3685-3. It is my first project in Python, so the code is somewhat cumbersome. Thanks to Mišo for getting me started (idea.o.o, abclinuxu.cz), and Bille for the API docs.

Regarding related projects, I have seen network-manager-cli, but it is for 0.6 only and the developers were only active last August, so I decided that I should first write some working code for 0.7.

I am interested in comments, bugs, feature requests, patches, any feedback.

Here are some screenshots ;-)

$ cnetworkmanager -h
cnetworkmanager 0.3 - Command Line Interface for NetworkManager
Options:
  -d, --dev     list devices
  -c, --actcon  list active connections
  -s, --syscon  list system connection settings
  -u, --usrcon  list user connection settings (can CRASH nm-applet)
  -a, --ap      list found access points
  -n, --nets    list found wireless networks
  -C<net>, --connect=<net> connect to a wireless network (using knetworkmanagerrc)
  -m, --monitor loop to show dbus signals

Listing the networks:

$ cnetworkmanager -n
cnetworkmanager 0.3 - Command Line Interface for NetworkManager
Wifi Networks:
 49: onenet (54Mb, protected)
 46: IT (54Mb, protected)
 48: TiborBrunclik (11Mb, protected)
 46: linksys (54Mb)
 46: IT (54Mb, protected)
 46: 23 (54Mb)

Testing Scribefire

Thanks to Duncan for suggesting an editor, Scribefire for Firefox. I have yet to see if it proves better than the one built in.

Let's try a command:

$ zypper moo
\\\\\
\\\\\\\__o
__\\\\\\\'/_

Installation without YaST

With 96MB of RAM, Linuxrc will not start on 11.0 (RC1). So I decided to exploit the image based installation, and not to use YaST at all for a change.

The target machine has dual boot and I am logged on the other system via the network, so I could paste this all in. Fasten your hats...

Update: Planet SUSE is eating the dollar variables :-( See the original post at Blogspot for the real thing.

Target partition:
# mkfs.ext3 /dev/hda1
# mount /dev/hda1 /mnt

A flash drive with images and kernel:
# mount /dev/sda1 /media
# cd /media/misc

Note I used unlzma beforehand because the target machine is way slow for that
# du -m *
5 base-i386.tar
12 base-meta-i386.tar
527 common-base-i386.tar
22 kernel-default-2.6.25.4-8.i586.rpm

Unpack!
# for i in *.tar; do dd if=$i bs=1M | tar -C /mnt -xf -; done &

While it is running, watch the progress:
# pkill -USR1 -x dd
...
552202240 bytes (552 MB) copied, 709,291 s, 779 kB/s

# cp kernel-default-*.i586.rpm /mnt/tmp

Before installing the kernel, we must do some setup so that the post-install script works.

# for i in dev proc sys; do mount --bind /$i /mnt/$i; done

# chroot /mnt
Now I use ## to mark that we are chrooted in the target system.

Modify partitions as needed.
Also see ls -l /dev/disk/by-id
## ROOT=/dev/hda1
## SWAP=/dev/hda4
## cat <<EOF > /etc/fstab
$ROOT / ext3 acl,user_xattr 1 1
$SWAP swap swap defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs noauto 0 0
debugfs /sys/kernel/debug debugfs noauto 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0
EOF

You probably don't need to set this one and the others starting with FIX_

## FIX_BOOT=acpi=force
## GROOT="(hd0,0)"
## cat <<EOF > /boot/grub/menu.lst
default 0
timeout 60
gfxmenu $GROOT/boot/message

title openSUSE 11.0
root $GROOT
kernel /boot/vmlinuz root=$ROOT resume=$SWAP vga=787 $FIX_BOOT
initrd /boot/initrd

title Failsafe -- openSUSE 11.0
root $GROOT
kernel /boot/vmlinuz root=$ROOT ide=nodma apm=off acpi=off noresume nosmp noapic maxcpus=0 edd=off x11failsafe vga=787
initrd /boot/initrd
EOF

Put GRUB to MBR
## GDEST="(hd0)"
## cat <<EOF > /boot/grub/device.map
$GDEST /dev/hda
EOF

## cat <<EOF > /etc/grub.conf
setup --stage2=/boot/grub/stage2 $GDEST $GROOT
quit
EOF

## sysconfig() { sed -i -s "/^$2=/s/=\"/=\"$3/" /etc/sysconfig/$1; }

I also need this. You probably don't
## FIX_MODS="ide-generic ide-core"
## sysconfig kernel INITRD_MODULES "$FIX_MODS"

I don't know whether these 2 are strictly necessary
## sysconfig bootloader LOADER_TYPE grub
## sysconfig bootloader LOADER_LOCATION boot

## rpm -Uhv /tmp/kernel-default-*.rpm
It will get the resume device wrong (according to *current* swap partition), but it seems harmless.

## grub-install

## passwd
## chkconfig SuSEfirewall2_init on
## chkconfig SuSEfirewall2_setup on

## exit
# reboot

BTW, I am fed up with the Blogger editor. Can I use an offline one so that I don't have to change blog hosting?

Easier Bugzilla search

I realized that I dislike beta bug reporting because it is so painful to search for duplicates before I report a problem. The search form is so ****ing painful to use!

So I wrote a replacement. Enjoy, view source, share, improve.

Search a substring in openSUSE 11.0 bugs (even closed ones): v 0.3

YaST from the Command Line

The Automatic Configuration in openSUSE 11.0 installation is good because you don't have to click Next so much, but now I am missing the button for opening SSH in the firewall.
Here's a one-liner to do it using YaST:

# yast2 firewall services add zone=EXT service=service:sshd

Try also:

# yast2 firewall help
# yast2 firewall longhelp
# yast2 firewall summary
# yast2 firewall services list
# yast2 -l
# yast2 FOO help

(Saying "yast" instead of "yast2" should work too, but there is bug 374259.)