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[ALUG Announce] 3rd Monday Monthly Ipswich Social Meeting : The Mulberry Tree
by samwise 21 Oct '13

21 Oct '13

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- The monthly "Third Monday" ALUG Ipswich Social Meeting is back today, 21st October, at 20:00: The Mulberry Tree 5 Woodbridge Road IPSWICH IP4 2EA Tel: 01473 225776 Map/Directions URI: http://maps.google.co.uk/?q=IP4+2EA WWW: https://www.facebook.com/MULBERRYHOSPITALITY The Mulberry Tree, previously known as The Milestone Beer House, is a grade 2 listed building in the centre of Ipswich. It is located at the intersection between Woodbridge Road and the A1156, across the road from the old Odeon cinema and not far from the Regent Theatre. It re-opened on Thursday March 29th 2012 after a major refurbishment, under its original name of The Mulberry House and has already begun to regain a good reputation for its selection of beers and ales. It has a sizeable car park to the rear of the building. All are welcome, novices and experienced users. Feel free to ask for further information on the Main ALUG mailing list. Cheers, Peter. ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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Recording event data efficiently
by Mark Rogers 18 Oct '13

18 Oct '13

I need to record changes in values of several variables (in this case around 9000) so that I can display their changes against time on a graph. I'd like a resolution of around 1min, however, I don't need to sample these values every minute because any change in value is available to me so the values only change on event. Storing a sample every minute for 9000 variables is about 1.3MB/day (each sample is a single byte). But that should compress heavily because for most of the time any given value will be static. So, what would be the best way to store these values for graphing? Recording the events in a database would be efficient storage but is not great for generating graphs from. (Graphs would be along the lines of what MRTG generates, at a rough guess, although that's not a tool I've used in anger. I looked at the MRTG log file format but unless I'm reading the spec wrong I don't think it's quite what I want.) If it matters, I plan on doing this on an ARM-based SBC such as a Pi or Beaglebone. Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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SQL injection
by Mark Rogers 17 Oct '13

17 Oct '13

A payment gateway that a client is using is reporting that data we're submitting to it is triggering an SQL injection warning, and as a result the connections are being rejected (the end user is in the payment stage on a shopping cart and it being told that their IP is being blocked, which isn't very nice). The string they're apparently picking up on is: (Size:Medium (Size 12) )|27.4917 and specifically the ') )|27' part of it. The error being generated is: Possible SQL injection attack (detectSQLi)"] [data "s))o1,ARGS:xxxx" Other strings have triggered this where the number is different, it seems to be ))|<number> that causes a problem. (xxxx is the field we're submitting the value in, edited so as not to identify the payment gateway in use) Any suggestions as to what SQL attack this is trying to catch? I can't think of anything where ))|27 would represent an SQL injection attack. At the moment the payment gateway is just telling us to remove that string (they haven't given us an option to escape/encode it) which makes no sense. I'd like to know if this is part of a set of standard rules they're using that makes sense to someone or a homegrown set that might not. Mark -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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Resizing a mdadm RAID5 array
by Mark Rogers 15 Oct '13

15 Oct '13

OK, so as per other thread I have a RAID5 array comprising 4x2TB disks in which I want to replace the disks. Makes sense that I replace with 3TB disks, so that will mean resizing the array. My options (as I see them) are: 1. Backup all the data on the disks. Replace them all and create a new array. Restore all the data. 2. Replace disks one at a time and let the array recover, leaving blank space at the end of each partition for now. Then resize the array to take advantage of the remaining space. 3. Remove the disks and image them onto the new disks, leaving blank space. Bring the array up on the new disks then resize. Option 1 is by far the simplest, does anyone see any reason why I should try to be cleverer than this? (Actually, option 1a comes to mind which is better still: buy the new disks and get them set up in another box, build the empty array, then copy the data across and transfer the disks; much reduced downtime. If the array is ready before the weekend, and I leave the data copying across over the weekend, I should be good to go on Monday..) I think I've answered my own question but would still appreciate comments. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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Can't uninstall Linux Spotify Client - help please
by steve-ALUG＠hst.me.uk 14 Oct '13

14 Oct '13

Hi Folks, Ages ago, I installed Spotify Linux client. I was tidying up today when I spotted that the Medibuntu project had closed so I removed that repository. I then spotted that I had the spotify client installed but I don't use it, so I tried to unistall it. It didn't work: sudo apt-get remove spotify-client [] The following packages will be REMOVED spotify-client [] Do you want to continue [Y/n]? y dpkg: error processing spotify-client (--remove): Package is in a very bad inconsistent state - you should reinstall it before attempting a removal. Errors were encountered while processing: spotify-client E: Sub-process /usr/bin/dpkg returned an error code (1) So I then tried to install it, various ways, for example https://www.spotify.com/uk/download/previews/ sudo apt-get install spotify-client Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: gir1.2-unique-3.0 libunique-3.0-0 Use 'apt-get autoremove' to remove them. The following packages will be upgraded: spotify-client 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. Need to get 41.7 MB of archives. After this operation, 17.7 MB of additional disk space will be used. Get:1 http://repository.spotify.com/ stable/non-free spotify-client i386 1:0.9.4.183.g644e24e.428-1 [41.7 MB] Fetched 41.7 MB in 1min 5s (634 kB/s) Selecting previously unselected package spotify-client. (Reading database ... 274060 files and directories currently installed.) Preparing to replace spotify-client 1:0.9.1.55.gbdd3b79.203-1 (using .../spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb) ... /var/lib/dpkg/info/spotify-client.prerm: 9: /var/lib/dpkg/info/spotify-client.prerm: ./unregister.sh: not found dpkg: warning: subprocess old pre-removal script returned error exit status 127 dpkg: trying script from the new package instead ... /var/lib/dpkg/tmp.ci/prerm: 9: /var/lib/dpkg/tmp.ci/prerm: ./unregister.sh: not found dpkg: error processing /var/cache/apt/archives/spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb (--unpack): subprocess new pre-removal script returned error exit status 127 No apport report written because MaxReports has already been reached /var/lib/dpkg/info/spotify-client.postinst: 5: /var/lib/dpkg/info/spotify-client.postinst: ./register.sh: not found dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 127 Errors were encountered while processing: /var/cache/apt/archives/spotify-client_1%3a0.9.4.183.g644e24e.428-1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) So now I'm stuck. I can't install it. I can't uninstall it. How can I get rid of this error and remove spotify? Cheers Steve

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What do these messages in syslog mean (stops my trackball working)?
by Chris Green 13 Oct '13

13 Oct '13

I have a Logitech wireless trackball that I use with my Acer Aspire netbook running Xubuntu 12.10. It works for quite a while (random amounts of time) and then stops, the following messages appear in syslog when it stops:- Oct 11 11:24:06 acer-aspire kernel: [ 7812.377726] uhci_hcd 0000:00:1d.1: >host controller process error, something bad happened! Oct 11 11:24:06 acer-aspire kernel: [ 7812.377751] uhci_hcd 0000:00:1d.1: >host controller halted, very bad! Oct 11 11:24:06 acer-aspire kernel: [ 7812.377781] uhci_hcd 0000:00:1d.1: >HC died; cleaning up Oct 11 11:24:06 acer-aspire kernel: [ 7812.378030] usb 3-1: >USB disconnect, device number 2 An identical Logical trackball works perfectly with Xubuntu 12.10 on my desktop machine. -- Chris Green

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music server hardware
by Peter Alcibiades 10 Oct '13

10 Oct '13

I've now bought a small HP thin client, a t574. Used on ebay it was 60 with no psu, but I picked up what looks like a very decent psu for a tenner. You can get earlier HP models for 35 or so, but this one has an atom processor so I thought it was worth the extra. Also more memory and flash drive. Got a 64G micro usb stick for storage, and will now install Slitaz and mpd as people have suggested. Or another one which seems quite interesting is sockso. However, meanwhile, and as always, one comes on the real solution after having bought an alternative, this seems the perfect solution: https://store.tinygreenpc.com/tiny-green-pcs/utilite-1.html This looks really neat. Wish I'd known about it before buying the thin client, which is probably very functional but by comparison very clunky. The thing that is a bit dismaying is that having started the process of ripping the CDs to FLAC, the free space on the 64G usb stick seems to be shrinking at an alarming rate.... Al

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Encrypt password in script
by Ewan Slater 08 Oct '13

08 Oct '13

Hi, A number of applications I have known will allow you to specify a password in plaintext in a startup file. After the first start, the password is encrypted, and will be used on subsequent starts, so you don't need an admin there to supply a password. I need to be able to do the same trick. A couple of hours of googling would suggest that it's done by PBE (password based encryption) but I can't seem to find a code example Java for preference). If anyone has any idea, or could point me to an example, that would be great. Cheers, Ewan

1 0

No path
by Chris Walker 05 Oct '13

05 Oct '13

I'm using an IDE called Qt Creator but looking at the C++ stuff in it, it says that it can't find much of the inbuilt libraries. If I run 'echo$PATH', it's empty. But I've modified the ~/.bash_profile to look like this :- =============== [chris@localhost ~]$ cat ~/.bash_profile # .bash_profile # Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc PATH=$PATH:/home/chris/qt/bin fi # User specific environment and startup programs PATH=$PATH:$HOME/bin export PATH unset USERNAME =============== The question is, well 2 questions, 1, have I modified the correct file, and 2 if I have done the correct file, have I modified it in the correct way?

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Building a .deb from files in github
by Mark Rogers 03 Oct '13

03 Oct '13

I've never built a .deb in my life, although I have a vague idea of what's required. Specifically I want to try to turn this: https://github.com/OpenMediaVault-Plugin-Developers/openmediavault-virtualb… into a .deb To my untrained eye it looks like most of the bits are probably in place but throwing it directly at dpkg-deb -b suggests otherwise. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

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