The Exploits of Plouj http://www.plouj.com/blog A blog by Michael Ploujnikov Wed, 03 Dec 2008 16:15:24 +0000 http://wordpress.org/?v=2.6.5 en Quick Picasa evaluation http://www.plouj.com/blog/2008/12/02/quick-picasa-evaluation/ http://www.plouj.com/blog/2008/12/02/quick-picasa-evaluation/#comments Wed, 03 Dec 2008 03:35:20 +0000 plouj http://www.plouj.com/blog/?p=144 This is a quick, biased, un-authoritative and incomplete evaluation of Google’s photo manager Picasa. In total, I’ve spent no more than a couple of hours using Picasa. I’ve already chosen to use Digikam as my photo manager so I was going to blatantly ignore its many faults and ruthlessly criticise Picasa. Don’t read this post to learn about Picasa. Download it yourself or look for more comprehensive reviews elsewhere on the ‘net. I’m writing this because I promised a friend at work to look at Picasa and later I decided to put my observations in writing. You’ve been warned.

What I liked

  • importing images into the gallery using a separate and (seemingly) lower priority thread makes  the UI usable right from the start.
  • it hasn’t crashed on me while importing 11,000+ pictures into the gallery
  • cute, but useless timeline display application
  • Google provided an RPM repository which makes installing, upgrading and un-installing very easy for me

What I disliked

  • simplified colour tuning controls. They might be OK for beginners, but they don’t appeal to someone like me who has used colour curves before.
  • at first launch, Picasa started to import images from my whole home directory, which is huge and has tonnes of pictures. This only made me realize just how many images I have (mostly application icons and game project textures) that really don’t belong in a photo catalogue. I also couldn’t find a way to tell Picasa to stop and only look in certain directories.
  • Picasa froze when I first tried the “tools > folder manager”. It worked on the second attempt, and I realized that this is the tool used to tell Picasa exactly what directories to include when searching for images.
  • the “Tools > Experimental > show duplicate pictures” function was indeed experimental. It seemed to just give me a list of images without indicating what the duplicate pairs (or groups) were.
  • the search results for the “show duplicate pictures” also showed a strange status bar at the top of the main window. I never figured out the meaning of the constantly changing seconds value or what GPixel was referring to.
  • the “importing indicator”, although neat (it showed what picture was being imported in real time), was rather useless. Most importantly, it did not show the total progress percentage. When I tried to close it, it seemed to just re-appear in a different location along the side of the main Picasa window. Then it simply started sliding up and down without explanation.
  • after a lot of clicking, I managed to loose the album list view in the left pane and had to re-start Picasa
  • ugly dithered splash screen image - c’mon, we’re not in the 1990’s anymore!
  • the scrollbar in the main view controls the view scroll speed, not the actual movement of the view - annoying and misleading. It didn’t let me get near the bottom right away, and I got dizzy every time I scrolled. However, I think the search result view actually changed the scroll bar function to the usual scroll bar for reasons beyond me.
  • I somehow totally failed to find the familiar timeline/calendar view of my photos. Does Picasa really not have a way to organize photos in this manner?
  • this is proprietary software from Google. I actually like a lot of stuff that comes from Google, but when it comes to software licensing, I don’t play favourites. I simply try to avoid non-Free software as much as I can.

What I ignored

  • uploading to and syncing with various web services
  • ordering prints
  • printing to a local/personal printer
  • picture backup feature - rsync is fine for me
  • passport photo function - what the heck?
  • the ability to store video flies, which I consider to be outside of the scope of this program
  • anything else I haven’t mentioned, obviously

Final thoughts

In conclusion, I’ve used my experience with Picasa to re-inforced my decision to stick with Digikam - a Free/OpenSource Software photo manager.

]]> http://www.plouj.com/blog/2008/12/02/quick-picasa-evaluation/feed/ Quake1 demo recorded on the Wii http://www.plouj.com/blog/2008/08/19/quake1-demo-recorded-on-the-wii/ http://www.plouj.com/blog/2008/08/19/quake1-demo-recorded-on-the-wii/#comments Wed, 20 Aug 2008 03:12:40 +0000 plouj http://www.plouj.com/blog/?p=87 I wastedspent today’s evening playing around with Quake1 which I installed on my brother’s Wii through the Homebrew channel. One cool thing that I managed to get working relatively painlessly was demo recording.

Since there is no keyboard support in Quake1 yet, I had to add the following bind to the /id1/config.cfg file on the SD card using a desktop computer:

bind "UPARROW" "disconnect; skill 3; record wii; map e1m1"

This allowed me to simply press the up arrow button on the Wii remote and Quake1 would start recording a demo of me playing the first level of the first episode on Nightmare difficulty.

So far, I haven’t been able to play the game as quickly and as precisely as I can on a computer with a mouse. Not that I’m a great Quake player to begin with. However, I still had a lot of fun, especially after I started using the Wii Zapper. It gave me a nice sensation of holding boom stick, but didn’t improve my aim.

Here is the actual demo bzip2 archive for those who really want to watch me get owned by zombies from another dimension for a few minutes. This demo should be playable with most Quake1 engines and original (full version or demo) game data from ID. I personally used Darkplaces:


.
These screenshots sort-of show that I’m shooting at stuff which is not directly under my cross-hair because of the way Wii remote look works. In the actual Wii Quake, the gun model also moves around the screen.

]]> http://www.plouj.com/blog/2008/08/19/quake1-demo-recorded-on-the-wii/feed/ Michael Phelps - New Chuck Norris http://www.plouj.com/blog/2008/08/19/michael-phelps-new-chuck-norris/ http://www.plouj.com/blog/2008/08/19/michael-phelps-new-chuck-norris/#comments Tue, 19 Aug 2008 14:15:18 +0000 plouj http://www.plouj.com/blog/?p=82 What a great way to start the morning: http://ianweller.org/2008/08/19/michael-phelps-is-the-new-chuck-norris/
I wonder if this is the kind of stuff/legends/myths/tales we’ll be telling our grand kids about.

]]> http://www.plouj.com/blog/2008/08/19/michael-phelps-new-chuck-norris/feed/ War Photographs from South Ossetia http://www.plouj.com/blog/2008/08/15/war-photographs-from-south-ossetia/ http://www.plouj.com/blog/2008/08/15/war-photographs-from-south-ossetia/#comments Sat, 16 Aug 2008 00:35:03 +0000 plouj http://www.plouj.com/blog/?p=63 I’ve put up a mirror of a forum post full of photographs from South Ossetia:

http://plouj.com/war-in-south-ossetia-almanac-art-of-war-www.navoine.ru/

Note:The photographs contain real blood and gore and therefore definitely not recommended for children.

The photos were taken by Аркадий Бабченко and now belong to the “Art of War” Almanac.

]]> http://www.plouj.com/blog/2008/08/15/war-photographs-from-south-ossetia/feed/ TAP that DHCP bridge for some Qemu TUN in Fedora http://www.plouj.com/blog/2008/07/29/tap-that-dhcp-bridge-for-some-qemu-tun-in-fedora/ http://www.plouj.com/blog/2008/07/29/tap-that-dhcp-bridge-for-some-qemu-tun-in-fedora/#comments Tue, 29 Jul 2008 23:22:40 +0000 plouj http://www.plouj.com/blog/?p=20 The other day I needed to setup bridged networking for a Qemu virtual machine. Although I found a rather well written generic TAP interfaces guide on Wikibooks. It only explained how to configure a network bridge on a host machine with a static IP. I wanted to do this on a host that used DHCP. Plus I wanted to keep all configuration in Fedora specific places. Having discovered a good way to do this through experimentation after a few fruitless Google searches I thought it would be useful for myself and others to have the configuration documented here.

ifcfg-eth0

First, I changed the host’s (auto-generated) /etc/sysconfig/network-scripts/ifcfg-eth0 script from this:

# Attansic Technology Corp. L1 Gigabit Ethernet Adapter
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:1D:60:35:A7:64
ONBOOT=yes

to this:

# Attansic Technology Corp. L1 Gigabit Ethernet Adapter
DEVICE=eth0
TYPE=Ethernet
BRIDGE=br0
ONBOOT=yes

This turns off DHCP on the physical Ethernet device and just specifies that it will be connected to or a part of a bridge.

ifcfg-br0

Second, I created /etc/sysconfig/network-scripts/ifcfg-br0, which will be called to setup a bridge device:

DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
HWADDR=00:1D:60:35:A7:64
ONBOOT=yes
DELAY=0
STP=off

As you can see, most of this configuration is copied from eth0 plus the bridge configuration as per the Qemu Wikibook.

qemu-ifup/down

Third, I shortened the /etc/qemu-ifup and /etc/qemu-ifdown from Wikibooks to get this:

/etc/qemu-ifup:

#!/bin/sh
USER=$(id -un)
sudo /usr/sbin/openvpn --mktun --dev $1 --user "$USER"
sudo /sbin/ifconfig $1 0.0.0.0 promisc up
sudo /usr/sbin/brctl addif br0 $1

/etc/qemu-ifdown:

#!/bin/sh
sudo /sbin/ifconfig $1 down
sudo /usr/sbin/brctl delif br0 $1
sudo /usr/sbin/openvpn --rmtun --dev $1

Here I basically removed all of the configuration that is taken care of in the sysconfig scripts. I also made explicit use of sudo simply because that is my preference.

Final steps

Now I can simply run /etc/qemu-ifup tap0 once to create a TAP device, and use something like: qemu-kvm -hda /virtual-machines/fedora9.disk -m 512 -net nic -net tap,ifname=tap0,script=no to start a virtual machine. When I’m done running the virtual machine, I can run /etc/qemu-ifdown tap0 to remove the TAP device.
It sounds simple now that it’s working, but initially it took a lot of guessing on my part so I’m documenting it here for the future.

I would appreciate it if someone can point me to the official Redhat/Fedora documentation on editing /etc/sysconfig/network-scripts/ scripts.

]]> http://www.plouj.com/blog/2008/07/29/tap-that-dhcp-bridge-for-some-qemu-tun-in-fedora/feed/ I can has ZENN car? http://www.plouj.com/blog/2008/07/29/i-can-has-zenn-car/ http://www.plouj.com/blog/2008/07/29/i-can-has-zenn-car/#comments Tue, 29 Jul 2008 16:12:22 +0000 plouj http://www.plouj.com/blog/?p=31 I just want to spread some awareness about the all-electric ZENN car and its legalization problems in Canada.

]]> http://www.plouj.com/blog/2008/07/29/i-can-has-zenn-car/feed/ Lexmark E250DN IPP Printing in CUPS http://www.plouj.com/blog/2008/06/22/lexmark-e250dn-ipp-printing-in-cups/ http://www.plouj.com/blog/2008/06/22/lexmark-e250dn-ipp-printing-in-cups/#comments Mon, 23 Jun 2008 01:14:24 +0000 plouj http://www.plouj.com/blog/?p=19 I just finished setting up my newly purchased monochrome duplex network printer - Lexmark E250DN. It took me a while to figure out how to configure CUPS on my GNU/Linux/Fedora machines to communicate with this printer. The problem was that I just didn’t know what URI to use for the printer. Unsurprisingly, the PDF and HTML documents that came with the printer didn’t mention such information. After all, why would Windows users need to know that if they can simply run the printer-specific utility to configure everything for them? Sheesh… Anyways. The CUPS manual was actually quite useful in listing common printer URIs. It turned out that the Lexmark URI lpd://printer-address/ps and a Generic PostScript driver worked quite well. In fact, the “/ps” part seems to be irrelevant, so simply lpd://printer.lan worked for me. However, the CUPS manual also suggested avoiding the LPD protocol if the printer supported other protocols. Using nmap I confirmed that my printer has at least something running on the IPP port (631):

$ nmap printer.lan

Starting Nmap 4.53 ( http://insecure.org ) at 2008-06-22 20:39 EDT
Interesting ports on printer.lan (10.1.1.7):
Not shown: 1705 closed ports
PORT      STATE SERVICE
21/tcp    open  ftp
79/tcp    open  finger
80/tcp    open  http
515/tcp   open  printer
631/tcp   open  ipp
5001/tcp  open  commplex-link
8000/tcp  open  http-alt
9100/tcp  open  jetdirect
10000/tcp open  snet-sensor-mgmt

Nmap done: 1 IP address (1 host up) scanned in 0.396 seconds

After a bit of trial and error, I discovered that simply using the http://printer.lan:631 or ipp://printer.lan URI and a Generic PostScript driver worked without problems with E250DN.

Apart from these initial pains I am quite happy to be able to print double-sided black-and-white documents from all of my home computers.

Side Note:

During the investigation process, I noticed that Fedora’s system-config-printer utility prints the following information to the terminal when I tell it the IPP printer hostname:

...
printer.lan: /usr/lib/cups/backend/snmp "${HOST}" 2>/dev/null
printer.lan: hp-makeuri -c "${HOST}" 2> /dev/null
No ID match for device ipp://printer.lan:
<manufacturer>Lexmark</manufacturer>
  <model>E250dn 6216N4G LE.PM.P121 -- Part Number -</model>
  <description>Lexmark E250dn 6216N4G LE.PM.P121 -- Part Number -</description>
  <commandset></commandset>
Using textonly.ppd
...

I wonder how I could get that XML-ish output myself. It doesn’t seem to come from hp-makeuri.

]]> http://www.plouj.com/blog/2008/06/22/lexmark-e250dn-ipp-printing-in-cups/feed/ Google Summer of Code turned down for a Job http://www.plouj.com/blog/2008/05/19/google-summer-of-code-turned-down-for-a-job/ http://www.plouj.com/blog/2008/05/19/google-summer-of-code-turned-down-for-a-job/#comments Mon, 19 May 2008 23:51:11 +0000 plouj http://www.plouj.com/blog/?p=14 In April I was privileged to be one of the 1125 students who got selected for the Google Summer of Code (GSoC) 2008 program. I was accepted to work on a project to implement Panorama Viewing in VLC. This summer was my last chance to participate in GSoC as a student because of my graduation date so I was very excited to have this once in a lifetime opportunity. More recently, I received an offer for a full-time “Linux Application and OS Developer” position at SOMA Networks - a company in downtown Toronto. Given the importance of a permanent job and having read the advice from previous GSoC participants, it didn’t take me long to decide to cancel the GSoC project and focus on the new job. Due to timing, however, I still managed to receive an acceptance gift from Google. The gift is a book called Beautiful Code: Leading Programmers Explain How They Think. Apart from being an interesting read, it’s a nice souvenir to keep in memory of the many hours I spent preparing for GSoC by choosing a project to apply for and writing multiple proposals.

]]> http://www.plouj.com/blog/2008/05/19/google-summer-of-code-turned-down-for-a-job/feed/ Fedora 9 Jigdo http://www.plouj.com/blog/2008/05/14/fedora-9-jigdo/ http://www.plouj.com/blog/2008/05/14/fedora-9-jigdo/#comments Wed, 14 May 2008 20:55:00 +0000 plouj http://www.plouj.com/blog/?p=13 So Fedora 9 has been released upon the masses yesterday. I won’t be able to try it for a while, but I decided to start downloading it now anyways. On the download page I noticed a curious new option of using Jigdo. After reading a bit about Jigdo it looks like it could fit me well. I have, what I consider to be, a fast (5Mbit download) Internet connection, but I don’t like the idea of straining mirror download servers of Free Software projects which usually exist on a volunteer basis (A recent check shows that the main Fedora mirror is indeed overloaded). Plus, my bittorrent download keeps going inactive so I’m currently downloading Fedora 9 with Jigdo.

In Fedora 8, Jigdo was easy to install:
# yum install jigdo

From the jgdo manpage I discovered that the command line client version of jigdo is actually called “jigdo-lite”. Using this client turned out to be as easy as telling it which “.jigdo” file to use:

$ jigdo-lite http://www.muug.mb.ca/pub/fedora/linux/releases/9/Fedora/x86_64/jigdo/Fedora-9-x86_64-DVD.jigdo

Jigdo was nice enough to ask me to enter a path to previous installation media (presumably Fedora) to check for files which can be reused. To my amusement it turned out that the Fedora 7 x86_64 DVD contained no such files while the Fedora 8 x86_64 DVD contained 116 of the 2691 files required by the template.

Resuming jigdo was an interesting process. I canceled the first attempt with Ctrl-C. Then I simply re-ran the original jigdo command and it told me:

The temporary directory `Fedora-9-x86_64-DVD.iso.tmpdir' already exists. Its contents
ARE GOING TO BE DELETED (possibly after having been copied to the
image, if they are of interest for it). If you do not want this
to happen, press Ctrl-C now. Otherwise, press Return to proceed.

This puzzled me because it didn’t say what is the meaning of the files in the *.tmpdir directory. Without knowing that I shouldn’t be expected to assess the importance of the directory and make a decision about deleting it. My initial guess was that it contained everything that jigdo has downloaded in the previous session. I checked the “jigdo” and “jigdo-lite” mangpages but they did not mention resuming. Thankfully, the documentation on the website was more helpful. The Downloading Of The ISO section made it clear that I shouldn’t fear to loose Fedora-9-x86_64-DVD.iso.tmpdir after all. Apparently it simply stores files which have just been downloaded but haven’t been merged into the temporary image (which is called Fedora-9-x86_64-DVD.iso.tmp). I checked that currently Fedora-9-x86_64-DVD.iso.tmpdir is much smaller than Fedora-9-x86_64-DVD.iso.tmp so I feel confident in letting jigdo delete that dir:

$ ls -lah
total 3.9G
drwxrwxr-x 3 plouj plouj 4.0K 2008-05-14 15:48 .
drwxr-xr-x 25 plouj plouj 4.0K 2008-05-14 11:16 ..
-rw-rw-r-- 1 plouj plouj 314K 2008-05-14 11:30 Fedora-9-x86_64-DVD.iso.list
-rw-rw-r-- 1 plouj plouj 3.9G 2008-05-14 15:47 Fedora-9-x86_64-DVD.iso.tmp
drwxrwxr-x 4 plouj plouj 4.0K 2008-05-14 15:47 Fedora-9-x86_64-DVD.iso.tmpdir
-rw-rw-r-- 1 plouj plouj 211K 2008-05-12 13:11 Fedora-9-x86_64-DVD.jigdo
-rw-rw-r-- 1 plouj plouj 12M 2008-05-12 11:38 Fedora-9-x86_64-DVD.template
-rw-rw-r-- 1 plouj plouj 3.0M 2008-05-14 11:30 jigdo-file-cache.db
$ du -sh Fedora-9-x86_64-DVD.iso.tmpdir
7.5M Fedora-9-x86_64-DVD.iso.tmpdir

Find confirms the same:

$ find Fedora-9-x86_64-DVD.iso.tmpdir -type f
Fedora-9-x86_64-DVD.iso.tmpdir/gulus.usherbrooke.ca/pub/distro/fedora/linux/releases/9/Fedora/x86_64/os/Packages/lucene-contrib-2.3.0-1jpp.0.fc9.x86_64.rpm
Fedora-9-x86_64-DVD.iso.tmpdir/gulus.usherbrooke.ca/pub/distro/fedora/linux/releases/9/Fedora/x86_64/os/Packages/libpng-1.2.24-1.fc9.x86_64.rpm
Fedora-9-x86_64-DVD.iso.tmpdir/gulus.usherbrooke.ca/pub/distro/fedora/linux/releases/9/Fedora/x86_64/os/Packages/lftp-3.6.3-2.fc9.i386.rpm
Fedora-9-x86_64-DVD.iso.tmpdir/www.muug.mb.ca/pub/fedora/linux/releases/9/Fedora/x86_64/os/Packages/glibc-2.8-3.x86_64.rpm

After I pressed “Return”, jigdo happily resumed downloading my Fedora 9 DVD. Some time later, the download finished successfully and the resulting image passed the SHA1SUM check.

In addition to the resuming confusion I noticed a few other problems with Jigdo. Firstly, it just takes a long time to download and check all the files. It has been running for over 3 hours and at 500KB/s (the average speed I get from good servers) the whole DVD image (3970.8 MB) would have been downloaded by now. Secondly, the name is hard to spell correctly. I’ve gone from “Jingo” to “Jidgo” to “Figdo”.

To be fair, I have to admit that the coolness of what jigdo does in the background outweighs its shortcomings and I am happy with it in the end.

]]> http://www.plouj.com/blog/2008/05/14/fedora-9-jigdo/feed/ shell history meme http://www.plouj.com/blog/2008/04/30/shell-history-meme/ http://www.plouj.com/blog/2008/04/30/shell-history-meme/#comments Wed, 30 Apr 2008 23:10:43 +0000 plouj http://www.plouj.com/blog/?p=9 On my home desktop machine:

$ history | awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
2835 ls
1624 cd
1246 ssh
964 svn
801 su
521 screen
479 man
472 rm
471 less
402 yum

same, but as root:

# history | awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
842 yum
317 ls
173 vim
107 mdadm
102 mount
80 man
73 ./secure-data2.sh
68 tail
63 dmesg|tail
62 umount

Yay for my system-wide setting of HISTSIZE=”50000″.
./secure-data2.sh is a script I use to mount an encrypted file from a USB stick.

]]> http://www.plouj.com/blog/2008/04/30/shell-history-meme/feed/