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• Repair ext4 filesystem on USB drive

  - by phineas

  Yet another filesystem question. I wanted to use a USB drive that I hadn't mounted for a month or so and was surprised by the fact Ubuntu was unable to mount it. I looked it up in the disk utility and it said it discovered a device with 17 MB instead of 2 GB. The hardware looks intact, I hope for the best for repairing the ext4 filesystem. I followed the instructions from HOWTO: Repair a broken Ext4 Superblock in Ubuntu, but I wasn't successful. # fsck.ext4 -v /dev/sdb e2fsck 1.42.5 (29-Jul-2012) ext2fs_open2: Bad magic number in super-block fsck.ext4: Superblock invalid, trying backup blocks... fsck.ext4: Bad magic number in super-block while trying to open /dev/sdb The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 Filesystem blocks are invalid, however when I run the recommended solution to try the alternate superblock, I get the following output: # e2fsck -b 8193 /dev/sdb e2fsck 1.42.5 (29-Jul-2012) e2fsck: Invalid argument while trying to open /dev/sdb plus the same error message as in the last paragraph above. Any ideas how to recover the drive? Thank you very much! Edit: testdisk won't help. I'm still stunned why the tools only discover 17 MB.

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• Splitting a tetris game apart - where to put time-management?

  - by nightcracker

  I am creating a tetris game in C++ & SDL, and I'm trying to do it "good" by making it object-oriented and keeping scopes small. So far I have the following structure: A main with some lowlevel SDL set up and handling input A game class that keeps track of score and provides the interface for main (move block down, etc) A map class that keeps track of the current game field, which blocks are where. Used by the game class. A block class that consists of the current falling block, used by game. A renderer class abstracting low level SDL to a format where you render "tetris blocks". Used by map and block. Now I have a though time where to place the time-management of this game. For example, where should be decided when a block bumps the bottom of the screen how long it takes the current block locks in place and a new block spawns? I also have an other unrelated question, is there some place where you can find some standard data on tetris like standard score tables, rulesets, timings, etc?

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• Looking for a better Factory pattern (Java)

  - by Sam Goldberg

  After doing a rough sketch of a high level object model, I am doing iterative TDD, and letting the other objects emerge as a refactoring of the code (as it increases in complexity). (That whole approach may be a discussion/argument for another day.) In any case, I am at the point where I am looking to refactor code blocks currently in an if-else blocks into separate objects. This is because there is another another value combination which creates new set of logical sub-branches. To be more specific, this is a trading system feature, where buy orders have different behavior than sell orders. Responses to the orders have a numeric indicator field which describes some event that occurred (e.g. fill, cancel). The combination of this numeric indicator field plus whether it is a buy or sell, require different processing buy the code. Creating a family of objects to separate the code for the unique handling each of the combinations of the 2 fields seems like a good choice at this point. The way I would normally do this, is to create some Factory object which when called with the 2 relevant parameters (indicator, buysell), would return the correct subclass of the object. Some times I do this pattern with a map, which allows to look up a live instance (or constructor to use via reflection), and sometimes I just hard code the cases in the Factory class. So - for some reason this feels like not good design (e.g. one object which knows all the subclasses of an interface or parent object), and a bit clumsy. Is there a better pattern for solving this kind of problem? And if this factory method approach makes sense, can anyone suggest a nicer design?

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• Unsure about TRIM enabled on my SSD

  - by user84750

  I have a SSD OCZ Vertex4 installed on my laptop. I'm running Ubuntu 12.04 LTS. I have enable TRIM by adding "discard" to my fstab file. (also added option noatime). I rebooted my Ubuntu and followed These instructions here to test TRIM. The end results of my tempfile was all ffff's, when it should have read all zero's, which is telling me TRIM is not really working or enabled correctly. Did I miss something? Also, will it be a problem if only my /home directory is encrypted. AND if you ask why I have swap on my SSD, it's because I let Ubuntu set up my partition. When I have my SSD, I just wanted to install Ubuntu as fast as possible. =) I've done testing to see at which point it will start to use swap and it took a lot of applications open to finally use swap. I currently have 4 GB of memory. I might shrink this to like 512 MB or 1 GB the most. Here's some info about my file system setup. sudo hdparm -I /dev/sda1 | grep "TRIM supported" Data Set Management TRIM supported (limit 16 blocks) sudo fdisk -l /dev/sda Device Boot Start End Blocks Id System /dev/sda1 * 2048 242016255 121007104 83 Linux /dev/sda2 242018302 250068991 4025345 5 Extended /dev/sda5 242018304 250068991 4025344 82 Linux swap / Solaris ls /dev/mapper control cryptswap1

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• Is SSD TRIM support still automatic in 12.10?

  - by dam

  Folks I had automatic TRIM working on my laptop running Ubuntu Precise. As in the TRIM guide I added discard to mount options in /etc/fstab, and hdparm --read-sector read 0s immediately after a rm && sync. Using the very same hardware, laptop and SSD, TRIM seems no longer to be automatic after upgrading to Quantal. I recognise the test in the guide I mentioned above may not necessarily work. SSD erase blocks and all that. But Quantal is at least different. After deleting the file and syncing, its data are still on disk and unerased even after waiting several minutes. fstrim will then 0 the dead file's blocks. Once. Repeat the same test five minutes later, and fstrim does nothing. I figure this is probably really a kernel issue, but that box is too black for my spelunking torch. I'm prepared to believe that kernel 3.5 knows what I want better than I do, and all is well despite appearances, but it looks for all the world like TRIM isn't quite all there any more. Anybody have the scoop on TRIM in Quantal/kernel 3.5?

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• Can't find new.h - getting gcc-4.2 on Quantal?

  - by Suyo

  I've been trying to compile the Valve Source SDK (2007) on my machine, but I keep running into the same error: In file included from ../public/tier1/interface.h:50:0, from ../utils/serverplugin_sample/serverplugin_empty.cpp:13: ../public/tier0/platform.h:46:17: new.h: No such file or directory I'm pretty new to C++ coding and compiling, but using apt-file search I tried to use every single suggestion for the required files in the Makefile (libstdc++.a and libgcc_eh.a), and none worked. I then found a note in the Makefile saying gcc 4.2.2 is recommended - I assume the older code won't work with the newer version, but gcc-4.2 is unavailable in 12.10. So my question/s is/are: If my assumption is right - how do I get gcc 4.2.2 on Quantal? If my assumption is wrong - what else could be the problem here? Relevant portion of the Makefile: # compiler options (gcc 3.4.1 will work - 4.2.2 recommended) CC=/usr/bin/gcc CPLUS=/usr/bin/g++ CLINK=/usr/bin/gcc CPP_LIB="/usr/lib/gcc/x86_64-w64-mingw32/4.6/libstdc++.a /usr/lib/gcc/x86_64-w64-mingw32/4.6/libgcc_eh.a" # GCC 4.2.2 optimization flags, if you're using anything below, don't use these! OPTFLAGS=-O1 -fomit-frame-pointer -ffast-math -fforce-addr -funroll-loops -fthread-jumps -fcrossjumping -foptimize-sibling-calls -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm -fexpensive-optimizations -frerun-cse-after-loop -fcaller-saves -fpeephole2 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove -fstrict-overflow -fdelete-null-pointer-checks -freorder-blocks -freorder-functions -falign-functions -falign-jumps -falign-loops -falign-labels -ftree-vrp -ftree-pre -finline-functions -funswitch-loops -fgcse-after-reload #OPTFLAGS= # put any compiler flags you want passed here USER_CFLAGS=-m32

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• Updating the jump in game

  - by Luka Tiger

  I am making a Java game and I want my game to run the same on any FPS so I'm using time delta between each update. This is the update method of the Player: public void update(long timeDelta) { //speed is the movement speed of a player on X axis //timeDelta is expressed in nano seconds so I'm dividing it with 1000000000 to express it in seconds if (Input.keyDown(37)) this.velocityX -= speed * (timeDelta / 1000000000.0); if (Input.keyDown(39)) this.velocityX += speed * (timeDelta / 1000000000.0); if(Input.keyPressed(38)) { this.velocityY -= 6; } velocityY += g * (timeDelta/1000000000.0); //applying gravity move(velocityX, velocityY); /*this is method which moves a player according to velocityX and velocityY, and checking the collision */ this.velocityX = 0.0; } The strange thing is that when I have unlimited FPS (and update number) my player is jumping about 10 blocks. It jumps even higher when the FPS is increasing. If I limit FPS it is jumping 4 blocks. (BLOCK: 32x32) I have just realized that the problem is this: if(Input.keyPressed(38)) { this.velocityY -= 6; } I add -6 to velocityY which increases player's Y proportionally to the update number and not to the time. But I don't know how to fix this.

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• How can I read a portion of one Minecraft world file and write it into another?

  - by RapierMother

  I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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• AdSense (reports) and custom channels

  - by RobbertT

  Please help me to further understand custom channels. As Google says it is a way to map your ads, but I still have a few questions: Is it correct that a single custom channel per 1 ad is not very useful, since you can specify Ad blocks in the AdSense reports? I have multiple Ads in multiple custom channels. After this I created 1 custom channel and added all the ads to it. I made this channel targetable, so people can target through this channel on all ads at once. Is this a good way to do it? In other words, is it possible to have ads in multiple custom channels (without targeting, just for analyzing) and then create 1 custom channel with targeting that embraces all the (desired) ads? Why is it not possible for me to analyze custom channels (or ad blocks & formats) per site in the Adsense (reports). Or am I doing something wrong? If not, I have to create different custom channels per site to see how certain ads are doing on a site level?

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• Splitting a tetris game apart - where to put time-management?

  - by nightcracker

  I am creating a tetris game in C++ & SDL, and I'm trying to do it "good" by making it object-oriented and keeping scopes small. So far I have the following structure: A main with some lowlevel SDL set up and handling input A game class that keeps track of score and provides the interface for main (move block down, etc) A map class that keeps track of the current game field, which blocks are where. Used by the game class. A block class that consists of the current falling block, used by game. A renderer class abstracting low level SDL to a format where you render "tetris blocks". Used by map and block. Now I have a though time where to place the time-management of this game. For example, where should be decided when a block bumps the bottom of the screen how long it takes the current block locks in place and a new block spawns? I also have an other unrelated question, is there some place where you can find some standard data on tetris like standard score tables, rulesets, timings, etc?

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• SD Card only mounted after a reboot

  - by evothur

  Hi everyone. I have a Kingston 2GB MicroSD and I plug it in via an inconix MicroSD Adapter to the internal card reader of my Samsung N210 Netbook with Ubuntu 10.10, but it doesn't show up. Only if I reboot the system when the card's plugged in it shows up. Why does it need a reboot for mounting? sudo fdisk -l gives the output below. But I can only see the drive when I reboot the computer while the card's plugged. Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9a5a7990 Device Boot Start End Blocks Id System /dev/sda1 1 1959 15728640 27 Unknown Partition 1 does not end on cylinder boundary. /dev/sda2 * 1959 1972 102400 7 HPFS/NTFS /dev/sda3 1972 18992 136718750 83 Linux /dev/sda4 18992 19458 3738625 5 Extended /dev/sda5 18992 19458 3738624 82 Linux swap / Solaris Disk /dev/sdb: 1973 MB, 1973420032 bytes 60 heads, 59 sectors/track, 1088 cylinders Units = cylinders of 3540 * 512 = 1812480 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 1089 1927100+ 6 FAT16

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• Good sysadmin practise?

  - by Randomthrowaway

  Throwaway account here. Recently our sysadmin sent us the following email (I removed the names): Hi, I had a situation yesterday (not mentioning names) when I had to perform a three way md5 checksum verification over the phone, more than once. If we can stick to the same standards then this will save any confusion if you are ever asked to repeat something over the phone or in the office for clarification. This is of particular importance when trying to speak or say this over the phone … m4f7s29gsd32156ffsdf … that’s really difficult to get right on a bad line. The rule is very simple: 1) Speak in blocks of 4 characters and continue until the end. The recipient can read back or ask for verification on one of the blocks. 2) Use the same language! http://en.wikipedia.org/wiki/Phoenetic_alphabet#NATO Myself, xxx and a few others I know all speak the NATO phonetic alphabet (aka police speak) and this makes it so much easier and saves so much time. If you want to learn quickly then all you really need is A to F and 0 to 9. 0 to 9 is really easy, A to F is only 6 characters to learn. Could you tell me if forcing the developers to learn NATO alphabet is a good practise, or if there are ways (and which ways) to avoid being in such a situation?

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• Pull Request Conversations, Inline Diff Enhancements

  [Do you tweet? Follow us on Twitter @matthawley and @adacole_msft] We deployed a new version of the CodePlex website today. Pull Request Conversations Previously, the only way for project members and users who submitted pull requests to converse was via e-mail. This complicated the review process and made conversations isolated and difficult to track. For this release, we’ve added functionality that enables you to have those same conversations within the pull request page. When you view a pull request, you’ll now see “Comments” and “Changes” tabs, with current comments displayed. Inline Diff Enhancements We tweaked the inline diff experience to make it easier to traverse diff blocks. When you open up the inline diff experience, you’ll now see up and down arrows. To move between the diff blocks, you can use those arrows or utilize the available keyboard shortcuts. Lastly, we have also brought the inline diff experience to the source control changes page for project and fork changesets. You can see both enhancements live by viewing the associated pull request or changeset changes on WikiPlex. The CodePlex team values your feedback. We are frequently monitoring Twitter, our Discussions, and Issue Tracker. If you have not visited the Issue Tracker recently, please take a few minutes to suggest or vote on a feature you would like to see implemented.

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• ubuntu boots only with usb

  - by klimat

  Just installed Ubuntu 11.04. But it boots only from usb. Seems like I didn't pay attention during selecting boot device. sudo fdisk -l [sudo] password for klim: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x000177e1 Device Boot Start End Blocks Id System /dev/sda1 1 60045 482302976 83 Linux /dev/sda2 60045 60802 6080513 5 Extended Partition 2 does not start on physical sector boundary. /dev/sda5 60045 60802 6080512 82 Linux swap / Solaris Disk /dev/sdb: 4004 MB, 4004511744 bytes 124 heads, 62 sectors/track, 1017 cylinders Units = cylinders of 7688 * 512 = 3936256 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000eee1a Device Boot Start End Blocks Id System /dev/sdb1 * 1 1017 3909317 b W95 FAT32 grub updating or another "grub" operations don't work as I've tried. Can I just copy whole boot folder from usb to HD or smth like that? Any kind of help is appreciated. Apologize for my newbie skills.

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• How can I get rid of the motd message "*** /dev/sdb1 will be checked for errors at next reboot ***"? [duplicate]

  - by kmm

  This question already has an answer here: Persistent “disk will be checked…” in the message of the day (motd) even after reboot 3 answers My motd persistently has: *** /dev/sdb1 will be checked for errors at next reboot *** The problem is that I don't have /dev/sdb1 on my system. I only have /dev/sdb2 (mouted as /) and /dev/sda1 which mounts to /media/backup. I delete that line from /etc/motd, but it reappears after reboot. Here's my df output: Filesystem Size Used Avail Use% Mounted on /dev/sdb2 73G 3.7G 66G 6% / udev 490M 4.0K 490M 1% /dev tmpfs 200M 760K 199M 1% /run none 5.0M 0 5.0M 0% /run/lock none 498M 0 498M 0% /run/shm /dev/sda1 1.9T 429G 1.4T 25% /media/backup Update Here is the output of sudo fdisk -l Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0003dfc2 Device Boot Start End Blocks Id System /dev/sda1 63 3907024064 1953512001 83 Linux Disk /dev/sdb: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00049068 Device Boot Start End Blocks Id System /dev/sdb1 152301568 156301311 1999872 82 Linux swap / Solaris /dev/sdb2 * 2048 152301567 76149760 83 Linux Partition table entries are not in disk order I guess /dev/sdb1 is my swap space.

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• Grub not loading after Windows 8 Install

  - by RazorXsr

  My system was configured to dual boot Ubuntu 12.04.1 LTS and Windows 7. Today I got my hands on the MSDN release of Windows 8 and I installed it over my Windows 7. Now the computer just boots to Windows 8 directly without loading the GRUB screen. So I followed the steps as suggested in: https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows. Running this command: ls -l /dev/disk/by-label/ gives the following output: total 0 lrwxrwxrwx 1 root root 10 Sep 11 07:51 Entertainment -> ../../sda2 lrwxrwxrwx 1 root root 10 Sep 11 02:45 PENDRIVE -> ../../sdb1 Also fdisk -l command gives this as the output: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x1246aa23 Device Boot Start End Blocks Id System /dev/sda1 * 2048 319582199 159790076 7 HPFS/NTFS/exFAT /dev/sda2 319582208 602906623 141662208 7 HPFS/NTFS/exFAT /dev/sda3 602908672 625135615 11113472 83 Linux Disk /dev/sdb: 1939 MB, 1939865600 bytes 64 heads, 63 sectors/track, 939 cylinders, total 3788800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc3072e18 Device Boot Start End Blocks Id System /dev/sdb1 * 2248 3788799 1893276 c W95 FAT32 (LBA) So I assume that I have to run this: sudo grub-install /dev/sda3 to get GRUB up and running. But I am getting this error: /usr/sbin/grub-probe: error: cannot find a device for /boot/grub (is /dev mounted?). Can anyone please guide me in the right direction? The current Ubuntu installation is far too customized to my needs to lose it to a boot manager issue! Any help is much appreciated!

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• Mounting a new hard drive (sda1) to my existing filesystem

  - by shank22

  I tried to read some posts regarding mounting a new hard drive, but I am facing some problem. My new hard drive is sda1. The output of sudo fdisk -l is: sudo fdisk -l Disk /dev/sdb: 999.7 GB, 999653638144 bytes 255 heads, 63 sectors/track, 121534 cylinders, total 1952448512 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00016485 Device Boot Start End Blocks Id System /dev/sdb1 * 2048 1935822847 967910400 83 Linux /dev/sdb2 1935824894 1952446463 8310785 5 Extended /dev/sdb5 1935824896 1952446463 8310784 82 Linux swap / Solaris Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x78dbcdc1 Device Boot Start End Blocks Id System /dev/sda1 2048 1953521663 976759808 7 HPFS/NTFS/exFAT What should be done to add this new sda1 hard drive on booting up? What should be added in the /etc/fstab file? I have not performed any partition on the new sda1 drive. I need help on how to proceed from scratch and can't afford to take any risk. Please help!

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• Invalid UTF-8 for Postgres, Perl thinks they're ok

  - by gorilla

  I'm running perl 5.10.0 and Postgres 8.4.3, and strings into a database, which is behind a DBIx::Class. These strings should be in UTF-8, and therefore my database is running in UTF-8. Unfortunatly some of these strings are bad, containing malformed UTF-8, so when I run it I'm getting an exception DBI Exception: DBD::Pg::st execute failed: ERROR: invalid byte sequence for encoding "UTF8": 0xb5 I thought that I could simply ignore the invalid ones, and worry about the malformed UTF-8 later, so using this code, it should flag & ignore the bad titles. if(not utf8::valid($title)){ $title="Invalid UTF-8"; } $data->title($title); $data->update(); However perl seems to think that the strings are valid, but it still throws the exceptions. How can I get perl to detect the bad UTF-8?

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• How to upload video on YouTube with Ruby

  - by viatropos

  I am trying to upload a youtube video using the GData gem (I have seen the youtube_g gem but would like to make it work with pure GData if possible), but I keep getting this error: GData::Client::BadRequestError in 'MyProject::Google::YouTube should upload the actual video to youtube (once it does, mock this test out)' request error 400: No file found in upload request. I am using this code: def metadata data = <<-EOF <?xml version="1.0"?> <entry xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/" xmlns:yt="http://gdata.youtube.com/schemas/2007"> <media:group> <media:title type="plain">Bad Wedding Toast</media:title> <media:description type="plain"> I gave a bad toast at my friend's wedding. </media:description> <media:category scheme="http://gdata.youtube.com/schemas/2007/categories.cat">People</media:category> <media:keywords>toast, wedding</media:keywords> </media:group> </entry> EOF end @yt = GData::Client::YouTube.new @yt.clientlogin("name", "pass") @yt.developer_key = "myKey" url = "http://uploads.gdata.youtube.com/feeds/api/users/name/uploads" mime_type = "multipart/related" file_path = "sample_upload.mp4" @yt.post_file(url, file_path, mime_type, metadata) What is the recommended/standard way for uploading videos to youtube with ruby, what is your method? Update After applying the changes to wrapped_entry, the string it produces looks like this: --END_OF_PART_59003 Content-Type: application/atom+xml; charset=UTF-8 <?xml version="1.0"?> <entry xmlns="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/" xmlns:yt="http://gdata.youtube.com/schemas/2007"> <media:group> <media:title type="plain">Bad Wedding Toast</media:title> <media:description type="plain"> I gave a bad toast at my friend's wedding. </media:description> <media:category scheme="http://gdata.youtube.com/schemas/2007/categories.cat">People</media:category> <media:keywords>toast, wedding</media:keywords> </media:group> </entry> --END_OF_PART_59003 Content-Type: multipart/related Content-Transfer-Encoding: binary ... and inspecting the request and response looks like this: Request: <GData::HTTP::Request:0x1b8bb44 @method=:post @url="http://uploads.gdata.youtube.com/feeds/api/users/lancejpollard/uploads" @body=#<GData::HTTP::MimeBody:0x1b8c738 @parts=[#<GData::HTTP::MimeBodyString:0x1b8c058 @bytes_read=0 @string="--END_OF_PART_30909\r\nContent-Type: application/atom+xml; charset=UTF-8\r\n\r\n <?xml version=\"1.0\"?>\n<entry xmlns=\"http://www.w3.org/2005/Atom\"\n xmlns:media=\"http://search.yahoo.com/mrss/\"\n xmlns:yt=\"http://gdata.youtube.com/schemas/2007\">\n <media:group>\n <media:title type=\"plain\">Bad Wedding Toast</media:title>\n <media:description type=\"plain\">\n I gave a bad toast at my friend's wedding.\n </media:description>\n <media:category scheme=\"http://gdata.youtube.com/schemas/2007/categories.cat\">People</media:category>\n <media:keywords>toast wedding</media:keywords>\n </media:group>\n</entry> \n\r\n--END_OF_PART_30909\r\nContent-Type: multipart/related\r\nContent-Transfer-Encoding: binary\r\n\r\n"> #<File:/Users/Lance/Documents/Development/git/thing/spec/fixtures/sample_upload.mp4> #<GData::HTTP::MimeBodyString:0x1b8c044 @bytes_read=0 @string="\r\n--END_OF_PART_30909--"] @current_part=0 @boundary="END_OF_PART_30909" @headers={"Slug"="sample_upload.mp4" "User-Agent"="GoogleDataRubyUtil-AnonymousApp" "GData-Version"="2" "X-GData-Key"="key=AI39si7jkhs_ECjF4unOQz8gpWGSKXgq0KJpm8wywkvBSw4s8oJd5p5vkpvURHBNh-hiYJtoKwQqSfot7KoCkeCE32rNcZqMxA" "Content-Type"="multipart/related; boundary=\"END_OF_PART_30909\"" "MIME-Version"="1.0"} Response: #<GData::HTTP::Response:0x1b897e0 @body="No file found in upload request." @headers={"cache-control"=>"no-cache no-store must-revalidate" "connection"=>"close" "expires"=>"Fri 01 Jan 1990 00:00:00 GMT" "content-type"=>"text/plain; charset=utf-8" "date"=>"Fri 11 Dec 2009 02:10:25 GMT" "server"=>"Upload Server Built on Nov 30 2009 13:21:18 (1259616078)" "x-xss-protection"=>"0" "content-length"=>"32" "pragma"=>"no-cache"} @status_code=400> Still not working, I'll have to check it out more with those changes.

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• Extending Throwable in Java

  - by polygenelubricants

  Java lets you create an entirely new subtype of Throwable, e.g: public class FlyingPig extends Throwable { ... } Now, very rarely, I may do something like this: throw new FlyingPig("Oink!"); and of course elsewhere: try { ... } catch (FlyingPig porky) { ... } My questions are: Is this a bad idea? And if so, why? What could've been done to prevent this subtyping if it is a bad idea? Since it's not preventable (as far as I know), what catastrophies could result? If this isn't such a bad idea, why not? How can you make something useful out of the fact that you can extends Throwable?

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• What's the best way to detect web applications attacks ?

  - by paulgreg

  What is the best way to survey and detect bad users behavior or attacks like deny of services or exploits on my web app ? I know server's statistics (like Awstats) are very useful for that kind of purpose, specially to see 3XX, 4XX and 5XX errors (here's an Awstats example page) which are often bots or bad intentioned users that try well-known bad or malformed URLs. Is there others (and betters) ways to analyze and detect that kind of attack tentative ? Note : I'm speaking about URL based attacks, not attacks on server's component (like database or TCP/IP).

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• align WMD editor's preview HTML with server-side HTML validation (e.g. no embedded javascript)

  - by Justin Grant

  There are many SO questions (e.g. here and here) about how to do server-side scrubbing of Markdown produced by the WMD editor to ensure the HTML generated doesn't contain malicious script, like this: <img onload="alert('haha');" src="http://www.google.com/intl/en_ALL/images/srpr/logo1w.png" /> This doesn't affect the WMD client's preview box. I doubt this is a big deal since if you're scrubbing the HTML on the server, an attacker can't save the bad HTML so no one else will be able to see it later and have their cookies stolen or sessions hijacked by the bad script. But it's still kinda odd to allow an attacker to run any script in the context of your site, and it's probably a bad idea to allow the client preview window to allow different HTML than your server will allow. StackOverflow has clearly plugged this hole. How did they do it? [NOTE: I already figured this out but it required some tricky javascript debugging, so I'm answering my own question here to help others who may want to do ths same thing]

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• Python: User-Defined Exception That Proves The Rule

  - by bandana

  Python documentations states: Exceptions should typically be derived from the Exception class, either directly or indirectly. the word 'typically' leaves me in an ambiguous state. consider the code: class good(Exception): pass class bad(object): pass Heaven = good() Hell = bad() >>> raise Heaven Traceback (most recent call last): File "<pyshell#163>", line 1, in <module> raise Heaven good >>> raise Hell Traceback (most recent call last): File "<pyshell#171>", line 1, in <module> raise Hell TypeError: exceptions must be classes or instances, not bad so when reading the python docs, should i change 'typically' with ''? what if i have a class hierarchy that has nothing to do with the Exception class, and i want to 'raise' objects belonging to the hierarchy? i can always raise an exception with an argument: raise Exception, Hell This seems slightly awkward to me What's so special about the Exception class, that only its family members can be raised?

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• Why people are so afraid of using clone() (on collection and JDK classes) ?

  - by Bozho

  A number of times I've argued that using clone() isn't such a bad practice. Yes, I know the arguments. Bloch said it's bad. He indeed did, but he said that implementing clone() is bad. Using clone on the other hand, especially if it is implemented correctly by a trusted library, such as the JDK, is OK. Just yesterday I had a discussion about an answer of mine that merely suggests that using clone() for ArrayList is OK (and got no upvotes for that reason, I guess). If we look at the @author of ArrayList, we can see a familiar name - Josh Bloch. So clone() on ArrayList (and other collections) is perfectly fine. (Just look at the implementation). Same goes for Calendar and perhaps most of the java.lang and java.util classes. So, give me a reason why not to use clone() with JDK classes?

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• MySQL, how can I SELECT WHERE one field value doesn't occurs in another?

  - by Jules

  I'm trying to do a search on my test server, speed isn't so important. I want to find if a phrase, the whole contents of one field, occurs in any part (as a whole) doesn't occur in another field. Heres my current query which finds if the phrase does occur SELECT pads.padid, pads.programname, keywords.word FROM Pads JOIN keywords ON Pads.Padid = keywords.Padid WHERE pads.Programname = keywords.word AND RemoveMeDate = '2001-01-01 00:00:00' My problem is that the field word contains other words too. I need to produce a count of where there isn't a keywords record with keywords.word equal to pads.programname ? EDIT: So if I have these records Pads: PadID=3 ProgramName=my prog PadID=4 ProgramName=Bad prog PadID=5 ProgramName=Good prog PadID=6 ProgramName=other prog Keywords: PadID=3 word=fox prog PadID=3 word=pig prog PadID=4 word=big prog PadID=4 word=nice prog PadID=5 word=fox prog PadID=6 word=bad prog PadID=6 word=fox prog The query I want would retun a count of 3 and record 6 has bad prog

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