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Get Youtube Channel ID from username

Internet

Youtube has a really nice RSS feature that is extremely well hidden.

If you postfix a Channel ID to

https://www.youtube.com/feeds/videos.xml?channel_id=<id goes here>

you get a really nice Atom 1.0 (~RSS) feed for your feedreader.

Unfortunately the Channel ID is hard to find while you are navigating Youtube with usernames in the URL.

E.g. https://www.youtube.com/c/TED is TED's channel, full of interesting and worth-to-watch content (and some assorted horse toppings, of course).

But you have to read a lot of ugly HTML / JSON in that page to find and combine

https://www.youtube.com/feeds/videos.xml?channel_id=UCAuUUnT6oDeKwE6v1NGQxug

which is the related RSS feed.

Jeff Keeling wrote a simple Youtube RSS Extractor that does well if you have a ../playlist?... or a .../channel/... URL but it will (currently) fail on user name channels or Youtube landing pages.

So how do we get the Channel ID for a Youtube user we are interested to follow?

Youtube has a great API but that is gated by API keys even for the most simple calls (that came only with v3 of the API but the previous version is depreciated since 2015)1:

dl@laptop:~$ curl 'https://www.googleapis.com/youtube/v3/channels?part=contentDetails&forUsername=DebConfVideos'
{
  "error": {
    "code": 403,
    "message": "The request is missing a valid API key.",
    "errors": [
      {
        "message": "The request is missing a valid API key.",
        "domain": "global",
        "reason": "forbidden"
      }
    ],
    "status": "PERMISSION_DENIED"
  }
}

Luckily we can throw the same (example) user name DebConfVideos at curl and grep:

dl@laptop:~$ curl -s "https://www.youtube.com/c/DebConfVideos/videos" | grep -Po '"channelId":".+?"'
"channelId":"UC7SbfAPZf8SMvAxp8t51qtQ"

So https://www.youtube.com/feeds/videos.xml?channel_id=UC7SbfAPZf8SMvAxp8t51qtQ is the RSS feed for DebConfVideos.

We can use individual Youtube video URLs as well. With the hack above, it'll work to find us the Chanel ID from a Youtube video URL:

Working around the Youtube API restrictions to still make use of their RSS feed

Now, some user pages may have multiple valid RSS feeds because they contain multiple channels.

Remember the TED page from above? Well run:

dl@laptop:~$ curl -s "https://www.youtube.com/c/TED" | grep -Po '"channelId":".+?"' | cut -d \" -f 4 | while read -r YTID ; do echo -n "Youtube-ID: $YTID " ; curl -s "https://www.youtube.com/feeds/videos.xml?channel_id=$YTID" | grep -m 1 -P -o "(?<=<title>).+(?=</title>)" ; done

This will iterate through the Channel IDs found and show you the titles. That way you can assess which one you want to add to your feedreader.

screenshot of the above

You probably want the last Channel ID listed above, the non-selective "TED" one. And that's the one from the example above.

Update

02.06.2022: smpl wrote in and has the much better solution for the most frequent use cases:

You can also use get a feed directly with a username:
https://www.youtube.com/feeds/videos.xml?user=<username>

The one I use most is the one for playlists (if creators remember to
use them).

https://www.youtube.com/feeds/videos.xml?playlist_id=<playlist id>

For the common case you don't even need the channel ID that way. But it is also conveniently given in a <yt:channelId> tag (or the topmost <id> tag) within the Atom XML document.

Thanks, smpl!


  1. Actually it is even more complicated as some channels, like our DebConfVideos example, will only get you an incomplete result, cf. this StackOverflow entry. I.e. the forUsername iterator may not even work and the "best practice" seems to be mucking around with the search call. 

Work-around for randomly dropping WiFi connections on ChromeOS

IT

The company got me a Chromebook for times when I want to ignore email and not get dragged into code reviews but still be available on IRC and chat. Nifty devices at great price points. I really like them.

Chromebook logo

These things are meant to be very consumer-style end-user devices. You log in with your Google account and everything works. Until it doesn't.

Just setting it up caused the first issue:

I was always thrown back to a black screen and then another login-screen despite having successfully logged in initially to create the "owner" user of the Chromebook. No error message, not useful UI feedback. Just logging in again and again and again.

The issue is ... not having a GMail account associated with my Google account. Duh! So add a GMail.com address as the primary to your Google account and the initial setup completes. Of course you cannot delete that GMail.com association again because the owner user is linked to the email and not the account. Well, you can delete it but then you cannot configure "owner" items of your Chromebook any more. Great job, Google. Not. Identity management 101 fail.

Kudos to Anurag Chawake for blogging about the issue. The Google support forum thead claims this is solved now. But it didn't work for me, so this may be needing to trickle down through ChromeOS releases or be deployed on more Google infra. Or whatever. We can't tell from outside the Googleplex as - of course - "Rebecca" sheds no light on what the identified "root cause" was:

Google Forum answer

Once I was able to login to the new Chromebook all worked fine until I started to use ssh sessions. These always hung for 30 seconds to 10 minutes and then resumed with lots of packets lost in between and the last minute or so coming in from buffering in a burst.

This was easy to see in ping as well. The connection essentially dropped dead while the WiFi icon was continuing to show full signal strength. The logs did not show anything useful. These are really hard to access on ChromeOS (JSON format and no useful UI on the Chromebook itself, Google provides a viewer on Google Apps Toolbox but that requires uploading the logs). Better than no logs at all but not really nice.

The ChromeOS bug tracker and its Google corporate counterpart are also not useful at this time.

For reference:
Google ... Device users randomly disconnect from Wi-Fi network
Chromium ... Device users randomly disconnect from Wi-Fi network
Google ... Constant connect and disconnect from WiFi source post-update
Chromium ... Constant connect and disconnect from WiFi source post-update

Playing around with the device on the network showed that it reduced sending power beyond being able to reach the access point any more. This is why disconnecting and re-connecting the WiFi fixes the issue for a few minutes, typically.

Still, there is a better way:

In crosh (the ChromeOS shell available when pressing Alt+Ctrl+T) type:

wifi_power_save disable

Crosh session screenshot

This unfortunately only lasts until the next reboot but it does persist over suspend cycles (aka closing the lid).

Leveling the playing field for non-native speakers

Fun

Wordle game

screenshort of bash, grep and pipes

 

Updates

24.01.2022: What I love about the community is the playful creativity that inspires a game like Wordle and that in turn inspires others to create fun tools around it:

Robert Reichel has reverse engineered the Wordle application, so in case you want to play tomorrow's word today .. you can. Or have that one guess "Genius" solution experience.

JP Fosterson created a Wordle helper that is very much the Python version of my grep-foo above. In case you play regularly and can use a hand.

And Tom Lockwood wrote a Wordle solver also in Python. He blogged about it and ... is pondering to rewrite things in Rust:

I’ve decided to explore Rust for this, and so far what was taking 1GB of RAM in Python is taking, literally 1MB in Rust!

Welcome to 2022.

01.02.2022: OMG. Wordle has been bought by the New York Times for "for a price in the low seven figures" (Source).

Joey Rees-Hill put it well in The Death of Wordle:

Today’s Web is dominated by platforms. The average Web user will spend most of their time on large platforms such as Instagram, Facebook, Twitter, TikTok, Google Drive/Docs, YouTube, Netflix, Spotify, Gmail, and Google Calendar, along with sites operated by large publishers such as The New York Times or The Washington Post. [..]
The Web wasn’t always this way. I’m not old enough to remember this, but things weren’t always so centralized. Web users might run their own small website, and certainly would visit a good variety of smaller sites. With the increasing availability of internet access, the Web has become incredibly commercialized, with a handful of companies concentrating Web activity on their own properties.
Wordle was a small site that gained popularity despite not being part of a corporate platform. It was wonderful to see an independent site gain attention for being simple and fun. Wordle was refreshingly free of attention-manipulating dark patterns and pushy monetization. That’s why it’s a shame to see it absorbed, to inevitably become just another feature of one large media company’s portfolio.

Still kudos to Josh Wardle, a Million Pounds for Wordle. Well done!

It was fun while it lasted. Let's see what the next Wordle will be. This one has just been absorbed into the borg collective.

Gradual improvements at the Linux Foundation

Strategy

After last year's blunder with trying to hide the Adobe toolchain and using hilarious stock photos, the Linux Foundation did much better in their 2021 annual report1 published Dec. 6, 2021.

Still they are using the Adobe toolchain (InDesign, Acrobat PDF) and my fellow DebianKernel2 Developer Geert was quick to point that out as the first comment to the LWN note on the publication:

LWN comment from Geert

I think it is important to call the Linux Foundation (LF) out again and again. Adobe is a Silver member of the LF and they can motivate them to publish their applications for Linux. And if that is not an option, there are Free alternatives like Scribus that could well use the exposure and funds of LF to help catch up to the market leading product, Adobe InDesign.

Linux Foundation Annual report 2021, document properties

Personally, as a photographer, I am very happy they used stock images from Unsplash to illustrate the 2021 edition over the cringeworthy Shutterstock footage from last year's report.

And they gave proper credit:

Thank you section for Unsplash from the Linux Foundation 2021 annual report

Now for next year ... find an editor that knows how to spell photographers, please. And consider Scribus. And make Adobe publish their apps for Linux. Thank you.


  1. Update 07.12.2021 22:00 CET: I had to replace the link to the Linux Foundation 2021 annual report with an archive.org one as they updated the report to fix the typo as per the comment from Melissa Schmidt below. Stable URLs are not a thing, apparently. You can find their new report at https://www.linuxfoundation.org/wp-content/uploads/2021_LF_Annual_Report_120721c.pdf. Unless somebody points out more typos. There is a Last-Modified Header in HTTP 1.1. Wordpress, Varnish and Nginx, serving the LF website, all support that. Diff of 2021_LF_Annual_Report_120621a and2021_LF_Annual_Report_120721c 

  2. 08.12.2021: Geert Uytterhoeven wrote in that he is "geert" on LWN, both are very nice Geert's but different Geert's :-) 

The Stallman wars

Open Source

So, 2021 isn't bad enough yet, but don't despair, people are working to fix that:

Welcome to the Stallman wars

Team Cancel: https://rms-open-letter.github.io/ (repo)

Team Support: https://rms-support-letter.github.io/ (repo)

Current Final stats are:

Team Cancel:  3019 signers from 1415 individual commit authors
Team Support: 6853 signers from 5418 individual commit authors

Git shortlog (Top 10):

rms_cancel.git (Last update: 2021-08-16 00:11:15 (UTC))
  1230  Neil McGovern
   251  Joan Touzet
    99  Elana Hashman
    73  Molly de Blanc
    36  Shauna
    19  Juke
    18  Stefano Zacchiroli
    17  Alexey Mirages
    16  Devin Halladay
    14  Nader Jafari

rms_support.git (Last update: 2021-09-29 07:14:39 (UTC))
  1821  shenlebantongying
  1585  nukeop
  1560  Ivanq
  1057  Victor
   880  Job Bautista
   123  nekonee
   101  Victor Gridnevsky
    41  Patrick Spek
    25  Borys Kabakov
    17  KIM Taeyeob

(data as of 2021-10-01)

Technical info:
Signers are counted from their "Signed / Individuals" sections. Commits are counted with git shortlog -s.
Team Cancel also has organizational signatures with Mozilla, Suse and X.Org being among the notable signatories. The 16 original signers of the Cancel petition are added in their count. Neil McGovern, Juke and shenlebantongying need .mailmap support as they have committed with different names.

Further reading:

12.04.2021 statements from the accused:

18.04.2021 Debian General Resolution

The Debian General Resolution (GR) vote of the developers has concluded to not issue a public statement at all, see https://www.debian.org/vote/2021/vote_002#outcome for the results.

It is better to keep quiet and seem ignorant than to speak up and remove all doubt.

See Quote Investigator for the many people that rephrased these words over the centuries. They still need to be recalled more often as too many people in the FLOSS community have forgotten about that wisdom...

01.10.2021 Final stats

It seems enough dust has settled on this unfortunate episode of mob activity now. Hence I stopped the cronjob that updated the stats above regularly. Team Support has kept adding signature all the time while Team Cancel gave up very soon after the FSF decided to stand with Mr. Stallman. So this battle was decided within two months. The stamina of the accused and determined support from some dissenting web devs trumped the orchestrated outrage of well known community figures and their publicity power this time. But history teaches us that does not mean the war is over. There will a the next opportunity to call for arms. And people will call. Unfortunately.

Compiling and installing the Gentoo Linux kernel on emerge without genkernel (part 2)

Gentoo

The first install of a Gentoo kernel needs to be somewhat manual if you want to optimize the kernel for the (virtual) system it boots on.

In part 1 I laid out how to improve the subsequent emerges of sys-kernel/gentoo-sources with a small drop in script to build the kernel as part of the ebuild.

Since end of last year Gentoo also supports a less manual way of emerging a kernel:

The following kernel blends are available:

  • sys-kernel/gentoo-kernel (the Gentoo kernel you can configure and compile locally - typically this is what you want if you run Gentoo)
  • sys-kernel/gentoo-kernel-bin (a pre-compiled Gentoo kernel similar to what genkernel would get you)
  • sys-kernel/vanilla-kernel (the upstream Linux kernel, again configurable and locally compiled)

So a quick walk-through for the gentoo-kernel variant:

1. Set up the correct package USE flags

We do not want an initrd and we want our own config to be re-used so:

echo "sys-kernel/gentoo-kernel -initramfs savedconfig" >> /etc/portage/package.use/gentoo-kernel

2. Preseed the saved config

The current kernel config needs to be saved as the initial savedconfig so it is found and applied for our emerge below:

mkdir -p /etc/portage/savedconfig/sys-kernel
cp -n "/usr/src/linux-$(uname -r)/.config" /etc/portage/savedconfig/sys-kernel/gentoo-kernel

3. Emerge the new kernel

emerge sys-kernel/gentoo-kernel

4. Update grub and reboot

Unfortunately this ebuild does not update grub, so we have to run grub-mkconfig manually. This can again be automated via a post_pkg_postinst() script. See the step 7 below.

But for now, let's do it manually:

grub-mkconfig -o /boot/grub/grub.cfg
# All fine? Time to reboot the machine:
reboot

5. (Optional) Prepare for the next kernel build

Run etc-update and merge the new kernel config entries into your savedconfig.

Screenshot of etc-update

The kernel should auto-build once new versions become available via portage.

Again the etc-update can be automated if you feel that is sufficiently safe to do in your environment. See step 7 below for details.

6. (Optional) Remove the old kernel sources

If you want to switch from the method based on gentoo-sources to the gentoo-kernel one, you can remove the kernel sources:

emerge -C "=sys-kernel/gentoo-sources-5*"

Be sure to update the /usr/src/linux symlink to the new kernel sources directory from gentoo-kernel, e.g.:

rm /usr/src/linux; ln -s "/usr/src/$(uname -r)" /usr/src/linux

This may be a good time for a bit more house-keeping: Clean up a bit in /usr/src/ to remove old build artefacts, /boot/ to remove old kernels and /lib/modules/ to get rid of old kernel modules.

7. (Optional) Further automate the ebuild

In part 1 we automated the kernel compile, install and a bit more via a helper function for post_pkg_postinst().

We can do the similarly for what is (currently) missing from the gentoo-kernel ebuilds:

Create /etc/portage/env/sys-kernel/gentoo-kernel with the following:

post_pkg_postinst() {
        etc-update --automode -5 /etc/portage/savedconfig/sys-kernel
        grub-mkconfig -o /boot/grub/grub.cfg
}

The upside of gentoo-kernel over gentoo-sources is that you can put "config override files" in /etc/kernel/config.d/. That way you theoretically profit from config improvements made by the upstream developers. See the Gentoo distribution kernel documentation for a sample snippet. I am fine with savedconfig for now but it is nice that Gentoo provides the flexibility to support both approaches.

Compiling and installing the Gentoo Linux kernel on emerge without genkernel (part 1)

Gentoo

Gentoo emerges of sys-kernel/gentoo-sources will nicely install the current kernel into /usr/src/linux-* but it will not compile them.

The Gentoo wiki kernel documentation has a script snippet to automate the kernel build with genkernel.

I do not like to use genkernel as it brings in lots of firmware files to build initrds that are not needed on virtual hardware. It also makes building the kernel slower.

So, the plain approach:

Make emerge sys-kernel/gentoo-sources symlink the latest kernel to /usr/src/linux so we can find it easily:

echo "sys-kernel/gentoo-sources symlink" >> /etc/portage/package.use/gentoo-sources

Create /etc/portage/env/sys-kernel/gentoo-sources with the following:

post_pkg_postinst() {
        CURRENT_KV=$(uname -r)
        unset ARCH
        if [[ -f "${EROOT:-/}usr/src/linux-${CURRENT_KV}/.config" ]] ; then
                cp -n "${EROOT:-/}usr/src/linux-${CURRENT_KV}/.config" "${EROOT:-/}usr/src/linux/.config"
                cd "${EROOT:-/}usr/src/linux/" && \
                make olddefconfig && \
                make -j5 && make modules_install && make install && \
                grub-mkconfig -o /boot/grub/grub.cfg
        fi
}

This will compile the next kernel on the basis of the config of the currently running kernel, install the modules and the kernel bzImage and update grub so it knows about the new kernel for the next reboot.

If you forget to unset ARCH the Linux build system will complain like:

Makefile:583: arch/amd64/Makefile: No such file or directory
make: *** No rule to make target 'arch/amd64/Makefile'.  Stop.

You can test the new magic by re-emerging the latest kernel, e.g. currently emerge =sys-kernel/gentoo-sources-5.4.80-r1:

Installing System Rescue (CD) to a flash drive

Linux

System Rescue, the project formerly known as System Rescue CD, has moved from being based on Gentoo to being built on Arch Linux packages.

With this their ISO layout changed substantially so when updating my trusty recue USB flash drive, I could not just update the kernel, initrd and the root filesystem image as I had typically done every other year before.

The "Installing on a USB memory stick" documentation is good for Windows (use Rufus, it's nice) but rather useless for Linux. They recommend a dd or the fancy graphical version of that, called usbimager.

I much prefer to have a flash drive that I can write to over an image of a CD (ISO) written 1:1 onto the flash media.

The basic idea is to use the bulk of the System Rescue ISO contents but amend these with your own grub and syslinux so they work as intended over the supplied ones that are bound to the ISO layout a bit too much.

I did this on Debian Buster but with some adjustments to paths and what packages to install, any recent Linux distribution should do:

Continue reading "Installing System Rescue (CD) to a flash drive"

No CCC Congress this year but rC3 online

Other

The virtual version of the annual CCC Congress is underway and feels like a huge playground. Things are bumpy but the participants are still having fun. Of course, we have IRC as a safe heaven. That always works.

The virtual world (which is the only thing the sold out tickets are needed for) is really fun. It feels like debugging a DOS game in the 80/90s. Not much works but it is engaging enough to keep poking at things.

The data formats are 2020 though, the main "lobby map" is a 3 MB json file:

{ "compressionlevel":-1,
 "editorsettings":
    {
     "export":
        {
         "format":"json",
         "target":"main.json"
        }
    },
 "height":80,
 "infinite":false,
 "layers":[
        {
         "data":[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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         "height":80,
         "id":2,
         "name":"start",
         "opacity":1,
         "type":"tilelayer",
         "visible":true,
         "width":80,
         "x":0,
         "y":0
        }, 
...

People that hand-optimized RLEs to fit games on floppies cry a little.

The streams are free (as in public), so please check https://streaming.media.ccc.de/ and the schedule at https://fahrplan.events.ccc.de/rc3/2020/Fahrplan/ for some great content to watch live or add to your play list.

No dog food today - the Linux Foundation annual report

Strategy

The Linux Foundation has published its annual report today. LWN calls it glossy and yeah, boy, it is shiny.

So shiny that people that work in the publishing industry immediately see this has been produced with the Adobe toolchain which - unfortunately - is one of the big suites of software not yet available for Linux.

Checking the PDF file metadata reveals the keywords "open source, open standards, open hardware, open data". That is what the Linux Foundation is about. Good stuff.

Linux Foundation annual report 2020 cover

The PDF producer meta data for the annual report PDF has been set to "Linux kernel 0.12.1 for Workgroups" and the PDF creator meta data element to "Sharp Zaurus XR-5000 (Maemo5) Edition". Somebody thought to better hide the real data and had some tongue-in-cheek ideas. Kudos.

But nicer would have been to use Open Source software to produce the report, not?

Running strings 2020-Linux-Foundation-Annual-Report_113020.pdf | grep Adobe | wc -l gives us 1229 lines and confirms the suspicion of the toolchain.

A stale /Title (Annual Report 2020) /Producer (macOS Version 10.15.7 \(Build 19H15\) Quartz PDFContext) has been forgotten in the document to tell us about the platform.

So, ladies and gentlemen, the Linux Foundation 2020 annual report has been produced on a Mac.

Running Adobe Creative Cloud on MacOS Catalina 10.15.7.

Which is proprietary software. Its kernel (and some userland pieces) are based on BSD. Not Linux.


The image on the front page also struck me as a bit odd ... using a ballpoint pen on the laptop screen?

Unbranded laptop. Unbranded cup in the foreground.

Kid in the background not paying attention to his tablet.

All of that cries stock image so loud it hurts.

Google currently finds ~560 uses of the picture and any editorial use nicely tells us that it is © Dragana Gordic / Shutterstock.

The image is "Smiling mom working at home with her child on the sofa while writing an email. Young woman working from home, while in quarantine isolation during the Covid-19 health crisis".

See the Daily Mail for a wonderful example of the working mum in context. I hope, if her laptop had been powered on, it would have run Linux. I mean, what else would still run on an old white MacBook with an Intel "Core 2 Duo" processor from 2008?

Daily Mail screenshot of the same stock image used

Continue reading "No dog food today - the Linux Foundation annual report"

Git shared hosting quirk

IT

Show https://github.com/torvalds/linux/blob/b4061a10fc29010a610ff2b5b20160d7335e69bf/drivers/hid/hid-samsung.c#L113-L118 to a friend.

Oops 'eh? Yep, Linux has been backdoored.

Well, or not.

Konstantin Ryabitsev explains it nicely in a cgit mailing list email:

It is common for git hosting environments to configure all forks of the same repo to use an "object storage" repository. For example, this is what allows git.kernel.org's 600+ forks of linux.git to take up only 10GB on disk as opposed to 800GB. One of the side-effects of this setup is that any object in the shared repository can be accessed from any of the forks, which periodically confuses people into believing that something terrible has happened.

The hack was discussed on Github in Dec 2018 when it was discovered. I forgot about it again but Konstantin's mail brought the memory back and I think it deserves more attention.

I'm sure putting some illegal content into a fork and sending a made up "blob" URL to law enforcement would go quite far. Good luck explaining the issue. "Yes this is my repo" but "no, no that's not my data" ... "yes, it is my repo but not my data" ... "no we don't want that data either, really" ... "but, but there is nothing we can do, we host on github...1".

Updates

05.11.20 Nate Friedman (CEO of Github) promises

[..] we are going to make it much more obvious when you're viewing an orphaned commit.

For context: The source code of Github (the product) had been leaked as a commit to Github's own DMCA repository. The repository has turned into a playground since Github took down the hosting for youtube-dl as the result of a DMCA complaint.

14.11.20 Seems Github now adds a warning to commits that are not in a reachable branch Github commit warning message

28.01.22 Github currently fails to show the warning message, so https://github.com/torvalds/linux/tree/8bcab0346d4fcf21b97046eb44db8cf37ddd6da0 is making rounds now: Fake commit to Linus Torvalds' kernel repo updating the README file and claiming to have deleted Linux


  1. Actually there is something you can do. Making a repo private takes it out of the shared "object storage". You can make it public again afterwards. Seems to work at least for now. 

Getting rid of the Google cookie consent popup

Internet

If you clear your browser cookies regularly (as you should do), Google will annoy you with a full screen cookie consent overlay these days. And - of course - there is no "no tracking consent, technically required cookies only" button. You may log in to Google to set your preference. Yeah, I'm sure this is totally following the intent of the EU Directive 2009/136/EC (the "cookie law").

Google cookie consent pop-up

Unfortunately none of the big "anti-annoyances" filter lists seem to have picked that one up yet but the friendly folks from the Computerbase Forum [German] to the rescue. User "Sepp Depp" has created the base of the following filter set that WFM (updated since):

Add this to your uBlock Origin "My filters" tab:

! Google - remove cookie-consent-popup and restore scroll functionality
! Updated 24.04.2021
google.*##.wwYr3.aID8W.bErdLd
google.*##.aID8W.m114nf.t7xA6
google.*##.jw8mI
google.*##.vUd4jb
google.*##div[jsname][jsaction^="dg_close"]
google.*##html:style(overflow: visible scroll !important;)
google.*##.widget-consent-fullscreen.widget-consent

! And for Youtube
! Updated 13.04.2021
www.youtube.com###dialog
www.youtube.com##ytd-popup-container.ytd-app.style-scope
www.youtube.com##tp-yt-iron-overlay-backdrop

Upgrading Limesurvey with (near) zero downtime

Open Source

Limesurvey is an online survey tool. It is very powerful and commonly used in academic environments because it is Free Software (GPLv2+), allows for local installations protecting the data of participants and allowing to comply with data protection regulations. This also means there are typically no load-balanced multi-server szenarios with HA databases. But simple VMs where Limesurvey runs and needs upgrading in place.

There's an LTS branch (currently 3.x) and a stable branch (currently 4.x). There's also a 2.06 LTS branch that is restricted to paying customers. The main developers behind Limesurvey offer many services from template design to custom development to support to hosting ("Cloud", "Limesurvey Pro"). Unfortunately they also charge for easy updates called "ComfortUpdate" (currently 39€ for three months) and the manual process is made a bit cumbersome to make the "ComfortUpdate" offer more attractive.

Due to Limesurvey being an old code base and UI elements not being clearly separated, most serious use cases will end up patching files and symlinking logos around template directories. That conflicts a bit with the opaque "ComfortUpdate" process where you push a button and then magic happens. Or you have downtime and a recovery case while surveys are running.

If you do not intend to use the "ComfortUpdate" offering, you can prevent Limesurvey from connecting to http://comfortupdate.limesurvey.org daily by adding the updatable stanza as in line 14 to limesurvey/application/config/config.php:

  1. return array(
  2.  [...]
  3.          // Use the following config variable to set modified optional settings copied from config-defaults.php
  4.         'config'=>array(
  5.         // debug: Set this to 1 if you are looking for errors. If you still get no errors after enabling this
  6.         // then please check your error-logs - either in your hosting provider admin panel or in some /logs directory
  7.         // on your webspace.
  8.         // LimeSurvey developers: Set this to 2 to additionally display STRICT PHP error messages and get full access to standard templates
  9.                 'debug'=>0,
  10.                 'debugsql'=>0, // Set this to 1 to enanble sql logging, only active when debug = 2
  11.                 // Mysql database engine (INNODB|MYISAM):
  12.                  'mysqlEngine' => 'MYISAM'
  13. ,               // Update default LimeSurvey config here
  14.                 'updatable' => false,
  15.         )
  16. );

The comma on line 13 is placed like that in the current default limesurvey config.php, don't let yourself get confused. Every item in a php array must end with a comma. It can be on the next line.

The basic principle of low risk, near-zero downtime, in-place upgrades is:

  1. Create a diff between the current release and the target release
  2. Inspect the diff
  3. Make backups of the application webroot
  4. Patch a copy of the application in-place
  5. (optional) stop the web server
  6. Make a backup of the production database
  7. Move the patched application to the production webroot
  8. (if 5) Start the webserver
  9. Upgrade the database (if needed)
  10. Check the application

So, in detail:

Continue reading "Upgrading Limesurvey with (near) zero downtime"

I think we need more creativity in statistics

Fun

" 'Boa constrictors swallow their prey whole, without chewing it. After that they are not able to move, and they sleep through the six months that they need for digestion.'

I pondered deeply, then, over the adventures of the jungle. And after some work with a colored pencil I succeeded in making my first drawing.

My Drawing Number One.

It looked something like this:

Boa Constrictor by Antoine de Saint Exupéry

I showed my masterpiece to the grown-ups, and asked them whether the drawing frightened them.

But they answered: 'Frighten? Why should any one be frightened by a hat?'

My drawing was not a picture of a hat. It was a picture of a boa constrictor digesting an elephant. But since the grown-ups were not able to understand it, I made another drawing: I drew the inside of a boa constrictor, so that the grown-ups could see it clearly. They always need to have things explained.

My Drawing Number Two looked like this:

Boa Constrictor in sectional drawing by Antoine de Saint Exupéry

The grown-ups' response, this time, was to advise me to lay aside my drawings of boa constrictors, whether from the inside or the outside, and devote myself instead to geography, history, arithmetic, and grammar.

That is why, at the age of six, I gave up what might have been a magnificent career as a painter. I had been disheartened by the failure of my Drawing Number One and my Drawing Number Two.

Grown-ups never understand anything by themselves, and it is tiresome for children to be always and forever explaining things to them."

from The Little Prince by Antoine de Saint Exupéry

 

Outcome of Cases (Recovery or Death) in Germany by Worldometers

from the Corona Fun with Statistics department at Worldometers (source, archive.org link)

Fixing the Nextcloud menu to show more than eight application icons

Internet

I have been late to adopt an on-premise cloud solution as the security of Owncloud a few years ago wasn't so stellar (cf. my comment from 2013 in Encryption files ... for synchronization across the Internet). But the follow-up product Nextcloud has matured quite nicely and we use it for collaboration both in the company and in FLOSS related work at multiple nonprofit organizations.

There is a very annoying "feature" in Nextcloud though that the designers think menu items for apps at the top need to be limited to eight or less to prevent information overload in the header. The whole item discussion is worth reading as it it an archetypical example of design prevalence vs. user choice.

And of course designers think they are right. That's a feature of the trade.
And because they know better there is no user configurable option to extend that 8 items to may be 12 or so which would prevent the annoying overflow menu we are seeing with 10 applications in use:

Screenshot of stock Nextcloud menu

Luckily code can be changed and there are many comments floating around the Internet to change const minAppsDesktop = 8. In this case it is slightly complicated by the fact that the javascript code is distributed in compressed form (aka "minified") as core/js/dist/main.js and you probably don't want to build the whole beast locally to change one constant.

Basically

const breakpoint_mobile_width = 1024;

const resizeMenu = () => {
    const appList = $('#appmenu li')
    const rightHeaderWidth = $('.header-right').outerWidth()
    const headerWidth = $('header').outerWidth()
    const usePercentualAppMenuLimit = 0.33
    const minAppsDesktop = 8
    let availableWidth = headerWidth - $('#nextcloud').outerWidth() - (rightHeaderWidth > 210 ? rightHeaderWidth : 210)
    const isMobile = $(window).width() < breakpoint_mobile_width
    if (!isMobile) {
        availableWidth = availableWidth * usePercentualAppMenuLimit
    }
    let appCount = Math.floor((availableWidth / $(appList).width()))
    if (isMobile && appCount > minAppsDesktop) {
        appCount = minAppsDesktop
    }
    if (!isMobile && appCount < minAppsDesktop) {
        appCount = minAppsDesktop
    }

    // show at least 2 apps in the popover
    if (appList.length - 1 - appCount >= 1) {
        appCount--
    }

    $('#more-apps a').removeClass('active')
    let lastShownApp
    for (let k = 0; k < appList.length - 1; k++) {
        const name = $(appList[k]).data('id')
        if (k < appCount) {
            $(appList[k]).removeClass('hidden')
            $('#apps li[data-id=' + name + ']').addClass('in-header')
            lastShownApp = appList[k]
        } else {
            $(appList[k]).addClass('hidden')
            $('#apps li[data-id=' + name + ']').removeClass('in-header')
            // move active app to last position if it is active
            if (appCount > 0 && $(appList[k]).children('a').hasClass('active')) {
                $(lastShownApp).addClass('hidden')
                $('#apps li[data-id=' + $(lastShownApp).data('id') + ']').removeClass('in-header')
                $(appList[k]).removeClass('hidden')
                $('#apps li[data-id=' + name + ']').addClass('in-header')
            }
        }
    }

    // show/hide more apps icon
    if ($('#apps li:not(.in-header)').length === 0) {
        $('#more-apps').hide()
        $('#navigation').hide()
    } else {
        $('#more-apps').show()
    }
}

gets compressed during build time to become part of one 15,000+ character line. The relevant portion reads:

var f=function(){var e=s()("#appmenu li"),t=s()(".header-right").outerWidth(),n=s()("header").outerWidth()-s()("#nextcloud").outerWidth()-(t>210?t:210),i=s()(window).width()<1024;i||(n*=.33);var r,o=Math.floor(n/s()(e).width());i&&o>8&&(o=8),!i&&o<8&&(o=8),e.length-1-o>=1&&o--,s()("#more-apps a").removeClass("active");for(var a=0;a<e.length-1;a++){var l=s()(e[a]).data("id");a<o?(s()(e[a]).removeClass("hidden"),s()("#apps li[data-id="+l+"]").addClass("in-header"),r=e[a]):(s()(e[a]).addClass("hidden"),s()("#apps li[data-id="+l+"]").removeClass("in-header"),o>0&&s()(e[a]).children("a").hasClass("active")&&(s()(r).addClass("hidden"),s()("#apps li[data-id="+s()(r).data("id")+"]").removeClass("in-header"),s()(e[a]).removeClass("hidden"),s()("#apps li[data-id="+l+"]").addClass("in-header")))}0===s()("#apps li:not(.in-header)").length?(s()("#more-apps").hide(),s()("#navigation").hide()):s()("#more-apps").show()}

Well, we can still patch that, can we?

Continue reading "Fixing the Nextcloud menu to show more than eight application icons"