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Debian Bits: Debian Perl Sprint 2015

Mon, 13/07/2015 - 20:00

The Debian Perl team had its first sprint in May and it was a success: 7 members met in Barcelona the weekend from May 22nd to May 24th to kick off the development around perl for Stretch and to work on QA tasks across the more than 3000 packages that the team maintains.

Even though the participants enjoyed the beautiful weather and the food very much, a good amount of work was also done:

  • 53 bugs were filed or worked on, 31 uploads were accepted.
  • The current practice of patch management (quilt) was discussed and possible alternatives were shown (git-debcherry and git-dpm).
  • Improvements were made in the Debian Perl Tools (dpt) and discussed how to get track of upstream git history and tags.
  • Team's policies, documentation and recurring tasks were reviewed and updated.
  • Perl 5.22 release was prepared and src:perl plans for Stretch were discussed.
  • autopkgtest whitelists were reviewed, new packages added, and IRC notificacions by KGB were discussed.
  • Outstanding migrations were reviewed.
  • Reproducibility issues with POD_MAN_DATE were commented.

The full report was posted to the relevant Debian mailing lists.

The participants would like to thank the Computer Architecture Department of the Universitat Politècnica de Catalunya for hosting us, and all donors to the Debian project who helped to cover a large part of our expenses.

Categories: LUG Community Blogs

Adam Trickett: Bog Roll: Body Mass

Thu, 02/07/2015 - 22:20

It's now been a few weeks since I've been on my new diet. Since April I've lost a further ~6 kg, currently weighing in at around 77 kg. Other than my trip to Guernsey which appear to have added 1 kg (all the raspberries and tomatoes...) instead of a 440 g loss, taking me about 1.5 kg off track. I've stopped using a weekly weigh-in, opting for a 7-day moving average which is less volatile and probably more meaningful.

My diet is basically what I had when I was too heavy but slightly tweaked:

  • Five servings of fruit per day
  • Five servings of vegetables per day
  • Five servings of nuts and/or beans per week
  • One serving of protein per day, lean or oily fish or vegetable based
  • Plenty of fibre, from the food rather than added as a supplement

I've had to exclude:

  • Salt - need to keep to the WHO limit, not the much higher UK limit
  • Caffeine - I don't drink coffee but I can only have very little or no tea, which I do like
  • Added sugars - no added sugars on/to anything
  • Added fat, especially saturated, trans-fats and Palm fat
  • Alcohol - it's got too much energy in it and there isn't space for it in the budget
  • No substitute foods, e.g. fat-free fat or synthetic sweeteners

The up shot is that with the limit on sugars, fats and salt most processed foods are now off limits, and will probably remain that way for ever. The occasion item is okay but it really has to be only occasionally.

The main addition to my diet are the nuts, I'm not really a fan of them, but they apparently are good for LDL/HDL ratio and blood pressure. I've also added some xylitol based mints as they are minty (I have a sweet tooth) and apparently there is good evidence that they contribute to reducing dental decay.

I've also swapped some of my yoghurt to yoghurt with plant sterols in or yoghurt based on soya rather than milk. Both are proven to reduce your LDL levels in the blood, which is probably a good idea - though possibly not enough to make a clinically significant outcome.

Categories: LUG Community Blogs

Steve Kemp: My new fitness challenge

Thu, 02/07/2015 - 09:18

So recently I posted on twitter about a sudden gain in strength:

I have conquered pull-ups! On Saturday night I could do 1.5. Today I could do 11! (Chinups were always easy.) #fitness

— Steve Kemp (@Stolen_Souls) June 15, 2015

To put that more into context I should give a few more details. In the past I've been using an assisted pull-up machine, which offers a counterweight to make such things easier.

When I started the exercise I assumed I couldn't do it for real, so I used the machine and set it on 150lb. Over a few weeks I got as far as being able to use it with only 80lb. (Which means I was lifting my entire body-weight minus 80lb. With the assisted-pullup machine smaller numbers are best!)

One evening I was walking to the cinema with my wife and told her I thought I'd be getting close to doing one real pull-up soon, which sounds a little silly, but I guess is pretty common for random men who are 40 as I almost am. As it happens there were some climbing equipment nearby so I said "Here see how close I am", and I proceeded to do 1.5 pullups. (The second one was bad, and didn't count, as I got 90% of the way "up".)

Having had that success I knew I could do "almost two", and I set a goal for the next gym visit: 3 x 3-pullups. I did that. Then I did two more for fun on the way out (couldn't quite manage a complete set.)

So that's the story of how I went from doing 1.5 pullus to doing 11 in less than a week. These days I can easily do 3x3, but struggle with more. It'll come, slowly.

So pull-up vs. chin-up? This just relates to which way you place your hands: palm facing you (chin-up) and palm way from you (pull-up).

Some technical details here but chinups are easier, and more bicep-centric.

Anyway too much writing. My next challenge is the one-armed pushup. However long it takes, and I think it will take a while, that's what I'm working toward.

Categories: LUG Community Blogs

Adam Trickett: Picasa Web: Guernsey 2015

Thu, 02/07/2015 - 08:00

Long weekend in Guernsey.

Location: Guernsey
Date: 2 Jul 2015
Number of Photos in Album: 82

View Album

Categories: LUG Community Blogs

Adam Trickett: Bog Roll: Guernsey Walking Holiday 2015 (Day 3+4)

Mon, 29/06/2015 - 23:55

Yesterday was our last full day on Guernsey as we return to the UK this afternoon. The forecast was good for the morning and not so good in the afternoon, so we decided to walk to the northern tip while it was nice and if needed take the bus back. More beaches and fewer crags on this section of coastline than the southside.

The afternoon wasn't so nice, but it also wasn't too bad so we were still able to walk back to our hotel without getting cold or wet. We have now walked all the eastern seaboard of Guernsey from the southern most point (I think) to it's northern most.

Today is our last day in Guernsey, and we have had a lovely break - I think we will come back but with our bikes and for more than just a flying visit.

As the ferry back to Blighty was in the afternoon, we had several hours to explore the castle that guards the port. It was a few quid to get in, but very interesting with several museums and lots to look at. We had a very nice lunch in the sun at the back of the castle in relative peace, with no pigeons, seagulls or tourists bothering us.

Back to work tomorrow!

Categories: LUG Community Blogs

Adam Trickett: Bog Roll: Guernsey Walking Holiday 2015 (Day 1+2)

Sat, 27/06/2015 - 21:49

Yesterday morning we awoke at silly o'clock to take the train to catch the ferry from Poole to Guernsey. The ferry was rather busy with people going to the Island Games in Jersey, but we got off a St. Peter Port. We walked up the hill to our B&B to discover there had been a booking error and they were actually full - so they took us to another hotel (an extra star) where we stayed instead.

The glorious weather we had for our crossing had mostly deserted us and it had become rather dull and flat. However the predicted rain didn't turn up so we were able to explore the town without getting wet and were able to find some food for dinner.

This morning was great, after our breakfast we went into town to explore further. Once we had bought lunch bits we took the bus towards the airport, getting off one stop shy, then we walked all along the southern coast back to St. Peter Port. The walking was easy and the views were beautiful - very reminiscent of the Brittany coast or Cornwall. More like the UK and less like France they were a bit stingy with with signs and it was a bit confusing in places - the French GR paint marking system is very simple and much easier to navigate with than the occasional sign!

When we made it back to town we had a look at La Valette Underground Military Museum, which was most fascinating, and packed with more stuff than you would imagine could fit in such a small place.

For dinner we decided to try eating out. La Creperie was strange, the staff appeared to be of Slavic origin, half the menu was not crepe or galette, but the galette was actually quite good though the crepe was only average. Definitely fusion food!

Categories: LUG Community Blogs

Debian Bits: Reproducible Builds get funded by the Core Infrastructure Initiative

Tue, 23/06/2015 - 13:00

The Core Infrastructure Initiative announced today that they will support two Debian Developers, Holger Levsen and Jérémy Bobbio, with $200,000 to advance their Debian work in reproducible builds and to collaborate more closely with other distributions such as Fedora, Ubuntu, OpenWrt to benefit from this effort.

The Core Infrastructure Initiative (CII) was established in 2014 to fortify the security of key open source projects. This initiative is funded by more than 20 companies and managed by The Linux Foundation.

The reproducible builds initiative aims to enable anyone to reproduce bit by bit identical binary packages from a given source, thus enabling anyone to independently verify that a binary matches the source code from which it was said it was derived. For example, this allow the users of Debian to rebuild packages and obtain exactly identical packages to the ones provided by the Debian repositories.

Categories: LUG Community Blogs

Anton Piatek: Hello Pace

Mon, 22/06/2015 - 15:53

After leaving IBM I’ve joined Pace at their Belfast office. It is quite a change of IT sectors, though still the same sort of job. Software development seems to have a lot in common no matter which industry it is for.

There’s going to be some interesting learning, things like DVB are pretty much completely new to me, but at the same time it’s lots of Java and C++ with similar technology stacks involved. Sadly less perl, but more Python so maybe I’ll learn that properly. I’m likely to work with some more interesting Javascript frameworks, in particular Angular.js which should be fun.

The job is still Software Development, and there should be some fun challenges with things like allowing a TV set top box to do on demand video content when all you have is a one-way data stream from a satellite, for instance, which make for some interesting solutions. I’m working in the Cobalt team which deals with a delivering data from the TV provider onto set top boxes, so things like settings, software updates, programme guides and on demand content and even apps. Other teams in the office work with the actual video content encryption and playback and the UI the set top box shows.

The local office seems to be all running Fedora, so I’m saying goodbye to Ubuntu at work. I already miss it, but hopefully will find Fedora enjoyable in the long term.

The office is on the other side of Belfast so is a marginally longer commute, but it’s still reasonable to get to. Stranmillis seems a nice area of Belfast, and it’s a 10 minute walk to the Botanical gardens so I intend to make some time to see it over lunch, which will be nice as I really miss getting out as I could in Hursley and its surrounding fields.

Categories: LUG Community Blogs

Steve Kemp: We're all about storing objects

Sun, 21/06/2015 - 17:10

Recently I've been experimenting with camlistore, which is yet another object storage system.

Camlistore gains immediate points because it is written in Go, and is a project initiated by Brad Fitzpatrick, the creator of Perlbal, memcached, and Livejournal of course.

Camlistore is designed exactly how I'd like to see an object storage-system - each server allows you to:

  • Upload a chunk of data, getting an ID in return.
  • Download a chunk of data, by ID.
  • Iterate over all available IDs.

It should be noted more is possible, there's a pretty web UI for example, but I'm simplifying. Do your own homework :)

With those primitives you can allow a client-library to upload a file once, then in the background a bunch of dumb servers can decide amongst themselves "Hey I have data with ID:33333 - Do you?". If nobody else does they can upload a second copy.

In short this kind of system allows the replication to be decoupled from the storage. The obvious risk is obvious though: if you upload a file the chunks might live on a host that dies 20 minutes later, just before the content was replicated. That risk is minimal, but valid.

There is also the risk that sudden rashes of uploads leave the system consuming all the internal-bandwith constantly comparing chunk-IDs, trying to see if data is replaced that has been copied numerous times in the past, or trying to play "catch-up" if the new-content is larger than the replica-bandwidth. I guess it should possible to detect those conditions, but they're things to be concerned about.

Anyway the biggest downside with camlistore is documentation about rebalancing, replication, or anything other than simple single-server setups. Some people have blogged about it, and I got it working between two nodes, but I didn't feel confident it was as robust as I wanted it to be.

I have a strong belief that Camlistore will become a project of joy and wonder, but it isn't quite there yet. I certainly don't want to stop watching it :)

On to the more personal .. I'm all about the object storage these days. Right now most of my objects are packed in a collection of boxes. On the 6th of next month a shipping container will come pick them up and take them to Finland.

For pretty much 20 days in a row we've been taking things to the skip, or the local charity-shops. I expect that by the time we've relocated the amount of possesions we'll maintain will be at least a fifth of our current levels.

We're working on the general rule of thumb: "If it is possible to replace an item we will not take it". That means chess-sets, mirrors, etc, will not be carried. DVDs, for example, have been slashed brutally such that we're only transferring 40 out of a starting collection of 500+.

Only personal, one-off, unique, or "significant" items will be transported. This includes things like personal photographs, family items, and similar. Clothes? Well I need to take one jacket, but more can be bought. The only place I put my foot down was books. Yes I'm a kindle-user these days, but I spent many years tracking down some rare volumes, and though it would be possible to repeat that effort I just don't want to.

I've also decided that I'm carrying my complete toolbox. Some of the tools I took with me when I left home at 18 have stayed with me for the past 20+ years. I don't need this specific crowbar, or axe, but I'm damned if I'm going to lose them now. So they stay. Object storage - some objects are more important than they should be!

Categories: LUG Community Blogs

Andy Smith: F11 and F12 over serial

Fri, 19/06/2015 - 21:39

I always seem to forget this one.

To pass F11 or F12 over a serial connection (either real serial or Serial-over-LAN IPMI), it’s Escape followed by ! (Shift+1) or @ (Shift+') respectively.

Note that on a US keyboard ! and @ would be next to each other above the 1 and 2 keys so that would make some vague kind of sense as alternatives to F11 and F12. But it’s literally the @ that matters and since I’m using a UK keyboard then it is Shift+'.

(╯°□°)╯︵ ┻━┻)

Categories: LUG Community Blogs

Andy Smith: Fun with Supermicro motherboard serial headers

Fri, 19/06/2015 - 17:42
or, “LOL, standards”

TL;DR: Most motherboards have a serial header in an IDC-10 (5×2 pins) arrangement with the pins as a row of even numbered pins (2,4,6,8,X) followed by a row of odd numbered pins (1,3,5,7,9). Supermicro ones appear to have the pins in sequential order (6,7,8,9,X and then 1,2,3,4,5). As a result a standard IDC-10 to DB-9 cable will not work and you’ll need to either hack one about or buy the Supermicro one.

Are we sitting comfortably?

I bought a Supermicro motherboard. It doesn’t have a serial port exposed at the back. I like to use serial ports for a serial console even though I am aware that IPMI exists. IPMI on this board works okay but I like knowing I can always get to the “real” serial port as well.

The motherboard has a COM1 serial header, and I wasn’t using the PCI expansion slot on the back of the chassis, so I decided to put a serial port there. I bought a typical IDC-10 / DB-9 cable and plate:

Didn’t work. Serial-over-LAN (IPMI) worked alright. On COM1 I would get either nothing or a run of garbage characters from time to time. I wasted a good number of hours messing with BIOS settings, baud rates, checking if my USB serial adaptor actually worked with another device (of which I only have one in my home), before I decided to sit down and check the pin numbering for both the header and the cable.

Looking at the motherboard manual we see this:

And the cable?

Notice anything amiss?

The cable’s pins go in a row of odd numbers and then a row of even numbers:

2 4 6 8 X 1 3 5 7 9 -

The X is the missing pin (serial uses 9 pins) and the - indicates where the notch for the connector would be: next to pin 5 in this case.

The header’s pins go in sequential order:

6 7 8 9 X 1 2 3 4 5 -

As a result all but pin 1 are incorrect.

You actually need a Supermicro cable for this. CBL-0010L is the part number in my case. CBL-0010LP would be the low profile version. Good luck finding it mentioned on Supermicro’s site, but your favourite reseller will probably know of it. As it was I found one on Ebay for £1.58+VAT, and it works now.

After knowing what to search for I also found someone else having a similar issue with a Supermicro board.

You could of course instead hack any existing cable’s pins about or fit an adaptor in between (as the person in the above link did).

Thanks Supermicro. Thupermicro.

Categories: LUG Community Blogs