Generating all permutations of a set

https://stemhash.com/efficient-permutations-in-lexicographic-order/ https://www.fon.hum.uva.nl/praat/manual/lexicographic_permutation_order.html#:~:text=The%20lexicographic%20permutation%20order%20starts,.%2C2%2C1). https://en.wikipedia.org/wiki/Heap%27s_algorithm https://rosettacode.org/wiki/Permutations/Rank_of_a_permutation#Go https://github.com/cbehopkins/permutation https://stackoverflow.com/questions/30226438/generate-all-permutations-in-go/30230552#30230552 https://www.gonum.org/ https://pkg.go.dev/gonum.org/v1/gonum/stat/combin#PermutationGenerator

How to Create a Windows 11 installer on a USB drive

read these: article, article.

Ensure that booting from cdrom is enabled in your UEFI settings.

cp -v Win11_English_x64v1.iso /dev/sdb

sgdisk --zap-all /dev/sdb
sgdisk --new=0:0+30G --typecode=0:ef00 --change-name=0:'EFI System' /dev/sdb
blockdev --rereadpt /dev/sdb
mkfs.ntfs --zero-time --label WINDOWS11 --no-indexing --quick /dev/sdb1
mkdir /tmp/WindowsISO
mount -o loop,ro /path/to/Win11_English_x64.iso /tmp/WindowsISO
mount /dev/sdb1 /mnt
cp -r /tmp/WindowsISO/. /mnt/
#rm /mnt/sources/install.wim
#wimsplit /tmp/WindowsISO/sources/install.wim /mnt/sources/install.swm 3800
umount /mnt
umount /tmp/WindowsISO
rmdir /tmp/WindowsISO

Just Discovered OpenVi

Since I moved to NixOS from Arch Linux as my daily driver last year, I missed having traditional vi available on my systems. Having the minimal vi around always felt good, because I could leverage its awesome power (packed in but a couple hundred kilobytes) and snappy startup time to do some edits here and there.

But, alas, it is not available on nixpkgs, and I had not found the time to build it from scratch myself.

The venerable port has received no updates since 2005, and it is kept sea-worthy by out-of-tree patches that address drift from current C compiler standards, including some security issues. Besides, the code lives on ye olde freshmeat, on a CVS repo.

So, last week I took another approach, namely to search for alternate sources of vi goodness. And I hit the jackpot with OpenVi (check the Overview for its ancestry), which is apparently well maintained, as well as available on nixpkgs. Not too shabby, eh?

I’ve tweaked my flake to make use of it, and quite happy with the result. Had to jump through some hoops, though, because when generating its .exrc config file, OpenVi wouldn’t accept it as a symlink to a pre-cooked config file on the Nix store (perceived ownership mismatch), so I had to leverage Home Manager’s activation stage to produce a plain file instead.

Yazi is a cool TUI file manager

I update my NixOS flake quite often, and usually check the git log of the updated components. Today, when browsing the latest changes to Home Manager, I learned about Yazi, a really cool TUI file manager written in Rust.

If its shell integration is enabled, a shortcut function ya is made available for ease of use.

TIL: command -v is the POSIX way to do which

While perusing the password-store git log, I came up with this commit, where I learned that POSIX defines the shell internal command command -v, which behaves like the external command which (that locates the absolute path to an executable, by tracing PATH).

The existence of the internal command (supported by bash, dash and fish, at least) is beneficial for writing more efficient shell scripts.

Enabling pinentry in Doom Emacs

I sometimes use emacs remotely via mosh, and in those situations I cannot depend on the graphical pinentry. Fortunately, the pinentry package (available at GNU ELPA) enables emacs to talk the pinentry protocol, and interface with the gpg-agent directly.

I found useful instructions to set it up under Doom Emacs on its GitHub issue #4647, with minor adjustments:

allow-emacs-pinentry

(package! pinentry)

(use-package! pinentry
    :init (setq epg-pinentry-mode `loopback)
          (pinentry-start))

Go: replacing `gofmt` with `gofumpt` when using `lsp-mode`

=gofumpt= is a better gofmt, with more strictures, that match my personal taste.

It is available at the AUR for Arch linux users as =gofumpt=.

Add this to your ~/.config/doom/config.el to instruct lsp-mode to use it.

;; https://pkg.go.dev/mvdan.cc/gofumpt
;; https://github.com/emacs-lsp/lsp-mode/blob/8f9259af6fc80a609c2c068d0f59c371205aca89/clients/lsp-go.el#L246
(setq lsp-go-use-gofumpt t)

It is directly supported by gopls, it just need to be told to use it.

Enabling 4K@60Hz on a RPi 4 on Ubuntu 21.10 Impish Indri

I have a Raspberry Pi 4 with 8 GiB of RAM, connected to a 4K monitor (Dell U3818DW). Enabling 60 Hz refresh rate should be as easy as adding the =hdmi_enable_4kp60=1= flag to /boot/firmware/config.txt.

But there seems to be a problem parsing the EDID information, because the resulting mode only affords 30 Hz.

Fortunately, we can program the mode ourselves:

[pi4]
# Enable 4K@60Hz, single monitor
#force_turbo=1
disable_fw_kms_setup=1
max_framebuffers=1
hdmi_enable_4kp60=1
hdmi_cvt=3840 1600 60 7
core_freq=600
core_freq_min=600

Note that core_freq has to be set to 600 in order to provide the necessary bandwidth for the mode. This is usually taken care of by setting hdmi_enable_4kp6h=1, but not in this case.

Customizing the default splash screen image on an Intel® NUC8

I have a NUC8i7BEH, which comes by default with some variation of:

Intel® published a way back the Intel® Integrator Toolkit (or ITT for short) which provides an UEFI executable that can be used to replace the default splash image. Let’s see how.

Requirements

NUC8 or older

The list of compatible devices can be found on the download page of the ITT.

A JPEG image with these restrictions:

Size

At most 60 KB.

Minimum resolution

120 x 120 pixels.

Maximum resolution

1920 x 1080 pixels.

JPEG Format

Unspecified. And only a subset of all the variants is supported. Fortunately, the ITT comes with a bunch of compatible JPEG files (the default one, at different resolutions), and we can use those as reference.

GIMP

We’ll use it to edit the desired picture and export it so that it adheres to the “specs” mentioned.

Producing the image

You can either draw one from scratch, or fetch one from the WWW via image search. Remember: nothing too fancy; we only have a maximum payload of 60 KB.

I’ve had success using images with black background, since it meshes nicely with the rest of the screen, rather than white, which produces a noticeable border when image ends and the black screen commences. But you be the judge.

Once you are happy, export it as JPEG, trying to reduce the size without sacrificing quality.

Producing a `.bio` file

Download the toolkit and extract the ITK6.efi executable onto your ESP. If that spooks you, you can use instead a FAT32 formatted USB drive.
Place a copy of the JPEG image alongside the ITK6.efi executable, e.g. splash.jpg
Enable the Internal UEFI Shell on the boot section of the BIOS Setup.
Boot the Internal UEFI Shell (pressing F10 on bootup may prove helpful).
Press ESC to prevent the execution of the startup.nsh.
Enter map -r to identify the device where the ITK6.efi resides, e.g. fs0:.
Enter fs0: (or the actual device in your case).
Enter ls to ascertain you are where you think you are.
Enter ITK6.efi -b -x SPLASH.bio -il splash.jpg. Some problems with the JPEG image are reported here, for instance, if it is too big. If so, rinse and repeat until this step does not croak.
Enter reset to reboot.
Press F7 to update BIOS.
Navigate to the ESP (or whatever device you are using) and select SPLASH.bio.
Confirm that you want to flash it.
The NUC will reboot, and you will be asked to confirm, by pressing 9, that you accept the flash request.
If the JPEG is accepted, you will see a message stating that the graphical memory is being updated. But if the image is not valid, it will skip to the (previous) splash image.
If everything is hunky-dory, the next thing you’ll see is your splash image, yay! But it could also be a blank screen. If so, try again until you get the JPEG format right.

TIL: The Fisher-Yates Shuffle

… or how to efficiently produce a permutation of a set of elements.

https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle

Incidentally, it is available in math/rand since Go 1.10.

Look for enlightenment here.

Preventing `systemd -- user` from launching

My friend Yari came to me this morning with a small challenge: How to create a temporary user on a GNU/linux system preventing the systemd --user from launching for that user upon login.

According to pam_systemd(8), user@.service is the one running systemd --user

So, we can accomplish what is needed by masking the aforementioned service just before the actual login:

sudo systemctl mask user@.service

Now login as the new user to perform some tasks. Once the login is complete, we can unmask the service, to leave things as they were:

sudo systemctl unmask user@.service

Backup your CDDA media to a single-file flac with embedded cuesheet

On Arch Linux, the required packages are readily available:

abcde -1 -o flac -a default,cue

This will produce a couple of files:

A single flac file with an embedded cuesheet (this cuesheet does not include metadata nor track names).
A cuesheet file.

If you use mpd to listen to your audio, the cuesheet file needs a just a small edit to be usable:

sed -i /^FILE/s/FLAC$/WAVE/ cuesheet.cue

Workaround for bad interaction between `pipenv` and `pyenv`

I use Arch Linux these days, and it is a ‘bleeding-edge’ distro, which means that, typically, only the latest stable versions of upstream packages are available.

Recently, python 3.8 entered the arch repos, replacing python 3.7 altogether. Note that =python 2.7= is still available, although I expect that it will be dropped on January.

So, if you are working on a project that depends on python 3.7, you can leverage pyenv, which is readily available from the Community repo.

pyenv requires a modicum of setup, which is described here.

pipenv supports working together with pyenv, and will detect if the required python version in your Pipfile is not installed in your system, and prompt you to install it on your behalf, via pyenv:

$ tail -2 Pipfile
[requires]
python_version = "3.7"
$ pipenv sync
Warning: Python 3.7 was not found on your system…
Would you like us to install CPython 3.7.5 with pyenv? [Y/n]:
Installing CPython 3.7.5 with pyenv (this may take a few minutes)…
✔ Success!

Warning: The Python you just installed is not available on your PATH, apparently.

Oops! Something is not working here, even though the PATH is setup OK.

It is a known issue with pipenv that is possibly fixed in master, but definitely not in the latest release, which, as of today, is almost a year old. Be patient, a lot has been happening, but work is underway.

We can work around this issue by ensuring that the required python version is installed, selecting it for the current project, and forcing pipenv to use it.

$ pyenv install 3.7.5
Downloading Python-3.7.5.tar.xz...
-> https://www.python.org/ftp/python/3.7.5/Python-3.7.5.tar.xz
Installing Python-3.7.5...
Installed Python-3.7.5 to /home/pancho/.pyenv/versions/3.7.5
$ cd someproject
# This creates a =.python-version= file containing the selected version
$ pyenv local 3.7.5
$ pipenv --python "$(pyenv root)/shims/python" sync
... Works OK now ...

This can be inconvenient if pipenv is being run from a Makefile that we don’t want to edit. Fortunately, there is a workaround for that, too.

Instead of using the --python option to pipenv, we can just define the env var PIPENV_PYTHON, which controls the same behaviour (seen here).

To sum up:

$ export PIPENV_PYTHON="$(pyenv root)/shims/python"
$ pyenv install 3.7.5
... yadda yadda ...
$ pyenv local 3.7.5
$ pipenv sync

As a final note, we can add the definition of PIPENV_PYTHON to your shell init script, so we don’t have to bother to set it up everytime this comes across.

Funny Shell trick

While sorting out a debian .bashrc file, I came across to this construct:

export HISTCONTROL=$HISTCONTROL${HISTCONTROL+,}ignoredups

I found interesting the ${HISTCONTROL+,} construct, which will evaluate to a comma (,) if HISTCONTROL is defined, to the empty string otherwise (I checked).

It is useful to enrich (i.e., add while preserving the previous values) variables with new values that must be comma-separated.

I’ll try to explain this further.

Let’s assume that we have an enviroment variable FOO that controls the behaviour of some program. We want to make sure that the FOO var holds the value bar, but we don’t know if some other scriptlet in the chain has already set some other value(s) to this var. So, in order to preserve possible preset values for FOO, we do this:

export FOO=${FOO}${FOO+,}myfoo  #¹

There are two obvious cases:

a) FOO wasn’t previously set, hence FOO=myfoo after ¹ is executed

b) FOO was previously set with, say FOO=bar,baz. Then, after ¹ is executed, FOO will be FOO=bar,baz,myfoo. Note the comma between baz and myfoo. That’s the doing of ${FOO+,}.

fork explained Star Wars style, in Perl

use Force qw(-midiclorians -jarjar);

my $vader = fork;
noooooo()
    unless $vader;  # I am your father

sub noooooo {
    hang_there_for_a_while();
    exit;           # to the Millenium Falcon
}

Links on Git Workflows

How to keep a copy of what you watch online

Adobe Flash (sic) is so pervasive these days, specially for online video distribution.

Sometimes (e.g., TED.com) the site kindly provides you with a link to download the video stream, but more often than not, they don’t (e.g., YouTube).

There are some tools around which will download the video feed for you, but only work for certain well-known sites. I’m thinking of course of clive and youtube-dl. These tools work by reverse-engineering the protocol the Flash client uses to talk to the “mothership”. Sometimes that protocol changes, without notice, and that leaves you out in the cold ’till the tool author cracks it again, and updates the tool in question accordingly.

So, in case you don’t have a working tool to download some nice video you just watched, here is a simple procedure to find out the download URL that the Flash client uses internally. Install some logging proxy, such as Tinyproxy, and configure your browser to use it. Load the page, watch a bit of the video, and then check the logs. The URL will be there. Feed it to wget, and you are all set!

Note that some sites will put the download URL literally in the web page, as a parameter to the Flash player object, so looking for the string .flv on the sources will work as well. RTVE is one of such sites.

This procedure worked for me nicely, and I guess that some variation of it is what the authors of clive and youtube-dl use to crack the protocols. Then I run into citywire, a british financial news site. Their Flash client uses https plus some kind of certificate to connect to their video repository, so the proxy technique won’t work. This is because the proxy only gets to see the encrypted connection, so you cannot extract the URL from it. And the certificate precludes the use of faking https proxies like WebScarab. Mmmm. This is gonna be tough.

Then I realised (while sleeping, actually) that the design of the client would require securing temporary disk storage to ensure the video reproduction, as the video streams could grow very large, and keeping all that stuff in RAM would be excessive. Where? Well, in /tmp, of course! Yeah, you will find that most Flash video player implementations work that way, securing a file named something like /tmp/Flash7oo3ar, where they download the video stream, and keep it there until you kill the player. Yay!

If you are in Windoze, these clients use exclusive file access to that temporary file, so you cannot copy it. And since the client removes it when it dies (when you close the web page on your browser), not much of a loophole there. But in UNIX® it’s a different story. A simple cp or ln to that file will allow you to keep it after the client dies. And what about Mac OS X? There you have per-user /tmp dirs, but once you locate that directory you will find the aforementioned file there. So we are all good! From now on, if you just watched an online video you want to keep, go to /tmp and it will be sitting there for you to back it up.

I really look forward to the next generation of web browsers providing unified video reproduction capabilities, and hence rendering all this crappy Flash stuff obsolete. That would be the day.

Kids, don’t try this at home!

Look at this beauty:

(){ :|:& };:

If fed to bash, it will start a cascade of processes that will leave your box almost inoperable. It is an example of what’s called “fork bomb”. Look there for further discussion, including cure and prevention.

I really love the Perl version of it:

fork while fork

he he.

Thanks to my friend Dato for showing it to me!

Introduction to Kerberos

My friend agi referred me to this theatrical introduction to the Kerberos network authentication protocol: Designing an Authentication System: a Dialogue in Four Scenes.

The play portraits two sysadmins working at MIT, Athena and Euripides, who decide to take on the task of designing such a beast.

Really nice reading. Anyone willing to play it?

Where was I?

UNIX® shells maintain the previous working directory in the variable OLDPWD, so it is easy to jump back to where you were previously dwelling:

cd $OLDPWD

This is a bit cumbersome to type, so this shortcut is provided:

cd -

(My then-classmate Carlos told me about this back in ’98).

Recently I learned that for commands other than cd, which is internal to the shell, ksh and bash provide a tilde expansion for this OLDPWD var, i.e.: ~-

$ cd /srv/media/doc/science/cs/biblia/oreilly/lang/perl
$ ls mastering*
mastering_perl.pdf
$ cd /this/other/place
$ cp -a ~-/mastering_perl.pdf .    # et voilà !

Music in the park

I just came home after a long walk through a park nearby (el Retiro). At a certain point, I started to hear an accordion melody, which I happened to know: « La Valse des monstres » from the Amélie original soundtrack, by Yann Tiersen. This would be no more than a nicety, if it wasn’t for the fact that the guy who was playing the melody was also… riding a monocycle! :-O. Some circus guy, I guess. I really enjoyed the moment.

Getting X to work on an asus eeebox

Make sure that xorg.conf looks like this:

Section "Device"
    Identifier  "Configured Video Device"
    Option      "monitor-LVDS"  "LVDS"
EndSection

Section "Monitor"
    Identifier  "LVDS"
    Option      "Ignore"    "True"
EndSection

Otherwise, the output will go to the LVDS port, which is not used on the eeebox.

Found the answer here.

Catalyst on Windows

After installing Strawberry Perl run these commands, and may the Gods of ADSL be with you…

C:\> cpanp "s conf prereqs 1; s save"
C:\> cpanp "s selfupdate all"
C:\> cpanp i Win32::Process Catalyst::Devel

New url for this blog’s feed - please update your syndication!

I’ve reconfigured my site to serve this blog from a static tree, instead of through cgi. The new syndication url is now:

https://blog.pancho.name/index.xml

Please, update your agregator settings to fetch the new url instead of the old one.

I will REMOVE access to the old one in a few days. Thanks!

Inspiration

I just found a reference to this article by Peter Norvig:

Teach Yourself Programming in Ten Years.

Perl mojo

I enjoy writing small Perl scripts to perform admin tasks.

A couple of days ago I had to delete more than 3000 messages in an email inbox, relaying only on POP3 to do it.

Issuing 3000+ dele commands by hand was not a very desirable prospect, so I performed a CPAN search looking for POP3-handling modules.

Bingo! Mail::Box::POP3 does the trick nicely. And it was already installed in my debian box, so I could proceed immediately:

#!/usr/bin/perl

use 5.010;
use warnings;
use strict;

use Mail::Box::POP3;

my $pop = Mail::Box::POP3->new(
    access      => 'rw',
    trace       => 'DEBUG',
    type        => 'pop3',
    username    => 'someuser',
    password    => 'somepass',
    server_name => 'pop3.whatever.server.example'
) or die "Cannot connect: $!";

$_->delete for $pop->messages;

Once $pop is created, the connetion is established with the server, and the message list (headers only) is loaded into the object, and available through the ‘messages’ method.

A simple ‘for’ iterates through the list, and deletes every sucker.

Nice and sweet.

Clarke is gone

This morning I started my day watching the 9th episode of “The Bing Bang Theory”. Just the first minutes, since I had to go to work. It was hilarious, they even made a funny homage to ‘2001 - a space odyssey movie’ (can you believe it?). Feeling comforted by it, I went for my daily dose of slashdot, and then it struck me:

Arthur C. Clarke is dead at 90.

My favourite writer is gone. He will meet Asimov in /dev/null, and make the place more fun!

Fare well, dear Sir.

Dinosaurs in Madrid!

A couple of weeks ago I was taking a pleasant walk by the neighbourhood when… GaLAxY! a Tyrannosaurus rex! Well, not quite, but at least a well preserved craneum from one of them. It was no museum, no… A shop! It is named “Geoda”, and specializes in fossils and minerals. Must see!

GEODA \ cl. General Díaz Porlier, 19 \ <M> Goya \ Madrid \ SPAIN

On ssh-agent

Yesterday a friend had an issue with ssh, so after having my dose of sleep, I decided to write about it and share it with the World! :-)

The Problem

If you use ssh, you probably have found an use for RSA/DSA keys. With these, instead of having to type (and send) passwords when you connect to a remote host, you just connect! (more on that later).

But unless your private key is saved unprotected (i.e., without a passphrase) each time you establish a ssh link you will have to type that passphrase. Not much of a gain, right?

But fear not, fellow hackers. ssh-agent to the rescue! This beast will keep an unencrypted copy of our RSA/DSA keys in memory, and to do so we will only have to type the passphrase just once (per session)!

You can even use svn or CVS over ssh, without a hassle.

Now, how does ssh know of the existence of ssh-agent? Well, this is UN*X, right? So, through the environment.

When invoked, ssh will look for this variable in the environment:

SSH_AUTH_SOCK=/tmp/ssh-lyKDh18679/agent.18679

So, if this one is set, ssh will try to talk to ssh-agent by means of that socket, and ask for her help to autenticate. This will initiate a Diffie-Hellman handshake, but that’s another story…

Chicken and Egg Problem

When invoked, ssh-agent will become a daemon and provide the following output:

$ ssh-agent
SSH_AUTH_SOCK=/tmp/ssh-BepcqN5028/agent.5028; export SSH_AUTH_SOCK;
SSH_AGENT_PID=5029; export SSH_AGENT_PID;
echo Agent pid 5029;

So, as of now, if we do nothing more, we well have a ssh-agent running, and nobody will know about it, not even ssh!

We have to affect the environment for everybody to know that we have an agent running, and how to contact it.

But the output of ssh-agent, if properly handed, would do just that!

$ eval `ssh-agent`
Agent pid 5029

Hey, now our environment contains SSH_* variables, that will be inherited by any subshell or subprocess. Including ssh!

If we use our system through a single point of entry, e.g., a single tty, then this setup works for us. But if you use either multiple ttys or a graphical environment with multiple terminal windows, then you have a problem. In these last two scenarios, if you launch a ssh-agent in a terminal, that daemon will not be known in a sibling terminal, so to say. Because there is no way that one process inherits the environment from a sibling process.

If you have to deal with the multiple ttys scenario I recommend the use of ‘keychain’. You will have to tweak a bit your .profile rc files, but otherwise works like a charm. It is a simple wrapper over ssh-agent. RTFM for more on that. (n.b.: F stands for Fine).

Now let’s check the multiple (graphical) terminals scenario I’m talking about rxvt, or xterm, or similar. Well, fortunately, the problem was solved may years ago. The X Window init scripts spawn a ssh-agent for us (if configured to do so), so every shell or process we get in our session is the descendant of an ‘enlightened’ one, i.e., one who got its environment updated to include the SSH_* variables. So we got it! We can right now launch a terminal and type:

ssh-add

And dutifully type our passphrase.

Even more, if we use this feature frequently, we can arrange our .xsession to ask for our passphrase just after login.

Sample .xsession:

SSH_ASKPASS=/usr/bin/ssh-askpass ssh-add < /dev/null
exec x-window-manager

This invocation of ssh-add is a little fancy, right? If we install the ssh-askpass software (debian package: ssh-askpass), we can tell ssh-add to use it (via environment) as a means to get the passphrase from us. Otherwise, ssh-add would try to read it from the terminal, which is not connected to the screen/keyboard in this phase of the session setup.

Well, hope that it helps! Feedback always welcome!

Bye bye, pesetas!

Hoy he ido al Banco de España, a cambiar mis últimas pesetas. Nunca había estado dentro, aunque una vez vi el interior en una película española, con José Coronado (sic).

Me gustó mucho verlo con mis propios ojos, y también fue curioso el proceso de canje; en cierta ventanilla disponen de una máquina donde se echan las monedas, y automáticamente se clasifican y contabilizan, de manera casi instantánea.

Bye bye, pesetas!

La Huella de Bach

Thanks to my friend ANTONIVS, I attended a nice concert today. I enjoyed it thoroughly, except perhaps Hindemith’s quartet #5 op. 32, which failed to capture my enthusiasm… :-)

The last piece of the concert read like this in the booklet:

«Obertura de El holandés errante tal como la tocaría a primera vista una mala orquestina de balneario a las siete de la mañana junto al manantial».

I don’t feel very much like translating that one; perhaps one day I will…

It was hilarious! They played very much like they said! Apart from ‘Les Luthiers’, this is the first time I’ve ever laughed with classical music.

About

About Me

Carbon-based semi-sentient life form currently dwelling on Sol III.

Footnotes

Run hugo

hugo server -D --navigateToChanged & disown
xdg-open http://localhost:1313

FilesExpand file tree

content.org

Latest commit

History

content.org

File metadata and controls

Generating all permutations of a set

How to Create a Windows 11 installer on a USB drive

read these: article, article.

Just Discovered OpenVi

Yazi is a cool TUI file manager

TIL: command -v is the POSIX way to do which

Enabling pinentry in Doom Emacs

Go: replacing gofmt with gofumpt when using lsp-mode

Enabling 4K@60Hz on a RPi 4 on Ubuntu 21.10 Impish Indri

Customizing the default splash screen image on an Intel® NUC8

Requirements

NUC8 or older

A JPEG image with these restrictions:

Size

Minimum resolution

Maximum resolution

JPEG Format

GIMP

Producing the image

Producing a .bio file

TIL: The Fisher-Yates Shuffle

Preventing systemd -- user from launching

Backup your CDDA media to a single-file flac with embedded cuesheet

Workaround for bad interaction between pipenv and pyenv

Funny Shell trick

fork explained Star Wars style, in Perl

Links on Git Workflows

How to keep a copy of what you watch online

Kids, don’t try this at home!

Introduction to Kerberos

Where was I?

Music in the park

Getting X to work on an asus eeebox

Catalyst on Windows

New url for this blog’s feed - please update your syndication!

Inspiration

Perl mojo

Clarke is gone

Dinosaurs in Madrid!

On ssh-agent

The Problem

Chicken and Egg Problem

Bye bye, pesetas!

La Huella de Bach

About

About Me

Footnotes

Run hugo

Hugo settings

Go: replacing `gofmt` with `gofumpt` when using `lsp-mode`

Producing a `.bio` file

Preventing `systemd -- user` from launching

Workaround for bad interaction between `pipenv` and `pyenv`