2024-07-19

Micropore Refresh

In 2008 I purchased a pair of Julbo Micropore glacier glasses from Opticus. This was before PRK, so I needed prescription lenses.

At that time, Opticus was the main (perhaps only) supplier of prescription glacier glasses for the US Antarctic Program and Raytheon Polar Services. Opticus sent me the frames with the prescription lenses installed, but included the uninstalled standard Julbo lenses in the package.

After my surgical shine job I installed the standard lenses, but still did not get back into the habit of wearing the Micropore glasses. They had quite a few miles on them by then. Both the nose pads and the rubber covers on ear hooks at the end of the temple arms were torn up, which diminished their comfort. And outside of deployments under Special Circumstances – like being on a glacier (do they still have those?) – the Micropores are not as functional as my Rudy Rydons. They fail to meet my simple sunglass criteria. Yet they are fun to wear, and unlike sports-wrap style spectacles like the Rydons, the Micropores fold down flat (more so if you do not have the leather side shields installed, as I usually do not). That is attractive for travel when you want to be able to store your spectacles without taking up a lot of space in a bag.

Julbo discontinued the Micropores I-don’t-know-how-many years ago. I think the modern equivalent is the Julbo Cham. But I recently learned that Julbo still offers spare Micropore parts. When I saw that, I jumped at the chance to refresh my pair. I purchased new temple arms, a new nose pad, and a new nose bridge.

I couldn’t actually figure out how to remove the old nose bridge. But once I removed everything that was obviously removable, I was able to clean my original nose bridge and decided that I didn’t actually need to replace that part (and my old one was already sanitized). The temple arms and nose pad were simple to replace.

The aggressive curve of the ear-hooks on this style of spectacles does not work well with the cable retention I use on the Rydons. Nor is such a thing necessary to keep them on your face – those big hooks keep them secure. But I do like the option of having some sort of lanyard so that I can drop the glasses and let them hang around my neck. This is especially useful given that the lenses are not photochromic. The Micropores originally came with a simple nylon cord, but I don’t know what happened to that. Now I am using a Chums Tech Cord. It is an injection molded piece of silicone, and about as simple as it gets. I like it.

The Micropores remain inferior to the Rydons, but I’m enjoying wearing them again intermittently. It is pleasing to be able to buy new components and rebuild old equipment. Eventually I may get custom cut lenses.

2024-07-17

books

Literata Book

My preferred e-reader font is Literata Book.

For the past two years I’ve used a Kobo Libra 2. Installing fonts onto the Kobo is a simple matter of copying the files to the fonts directory, though it is picky about the filenames. I install the bold, bold italic, italic, and regular variants.

Other fonts I have installed are: the standard Literata, Atkinson Hyperlegible, and Bitter Pro. But I use Literata Book most often.

$ ls -1 /media/KOBOeReader/fonts
AtkinsonHyperlegible-BoldItalic.otf
AtkinsonHyperlegible-Bold.otf
AtkinsonHyperlegible-Italic.otf
AtkinsonHyperlegible-Regular.otf
BitterPro-BoldItalic.ttf
BitterPro-Bold.ttf
BitterPro-Italic.ttf
BitterPro-Regular.ttf
Literata-BoldItalic.ttf
Literata-Bold.ttf
LiterataBook-BoldItalic.otf
LiterataBook-Bold.otf
LiterataBook-Italic.otf
LiterataBook-Regular.otf
Literata-Italic.ttf
Literata-Regular.ttf

I uploaded an archive of the fonts.

2024-07-16

links

Link Log 2024-07-16

UNIX: Making Computers Easier To Use

Indirect Imaging, Elevators Gone Wild, Backlight Cosmology

OpenSSL get entire certificate chain from a domain or loop over entire chain in file

Return of a King: Talk by Mr William Dalrymple

Results of gun care product evaluation

2024-07-06

run, physical training

Night Run

I began running at night last autumn. I referred to them as “night runs” but this phrase was mostly aspirational, as I would usually take off around 18:00, or shortly thereafter. But it was dark, and that was the point.

I found that I enjoyed running through the dark, sometimes through city streets, other times down wooded trails, solitary in my small forcefield of light. I’ve seen all sorts of wildlife: raccoons, coyotes, Donald Trump’s motorcade. I once ran by a guy valiantly attempting to blow on a didgeridoo while playing death metal on his phone.

This year, as the days lengthened, my late afternoon runs started to become light enough to not require a headlamp. That was no fun, so in the spring I rescheduled my runs to start around 21:30 – sometimes as early as 21:00 if I’m heading up Twin Peaks and want to catch the metropolitan alpenglow. Now they are actually night runs.

2024-07-05

backups, linux

Wherein the Author Learns to Compact Borg Archives

I noticed that my Borg directory on The Cloud was 239 GB. This struck me as problematic, as I could see in my local logs that Borg itself reported the deduplicated size of all archives to be 86 GB.

A web search revealed borg compact, which apparently I have been meant to run manually since 2019. Oops. After compacting, the directory dropped from 239 GB to 81 GB.

My borg wrapper script now looks like this:

#!/bin/sh
source ~/.keys/borg.sh
export BORG_REPO='borg-rsync:borg/nous'
export BORG_REMOTE_PATH='borg1'

# Create backups
echo "Creating backups..."
borg create --verbose --stats --compression=lz4             \
    --exclude ~/projects/foo/bar/baz                        \
    --exclude ~/projects/xyz/bigfatbinaries                 \
    ::'{hostname}-{user}-{utcnow:%Y-%m-%dT%H:%M:%S}'        \
    ~/documents                                             \
    ~/projects                                              \
    ~/mail                                                  \
    # ...etc

# Prune
echo "Pruning backups..."
borg prune --verbose --list --glob-archives '{hostname}-{user}-*'   \
    --keep-within=1d                                                \
    --keep-daily=14                                                 \
    --keep-weekly=8                                                 \
    --keep-monthly=12                                               \

# Compact
echo "Compacting repository..."
backitup                                \
    -p 604800                           \
    -l ~/.borg_compact-repo.lastrun     \
    -b "borg compact --verbose"         \

# Check
echo "Checking repository..."
backitup -a                                                         \
    -p 172800                                                       \
    -l ~/.borg_check-repo.lastrun                                   \
    -b "borg check --verbose --repository-only --max-duration=1200" \

echo "Checking archives..."
backitup -a                                             \
    -p 259200                                           \
    -l ~/.borg_check-arch.lastrun                       \
    -b "borg check --verbose --archives-only --last 18" \

Other than the addition of a weekly compact, my setup is the same as it ever was.

2024-07-03

books, toolchain, linux

Working with ACSM Files on Linux

I acquire books from various OverDrive instances. OverDrive provides an ACSM file, which is not a book, but instead an XML ticket meant to be exchanged for the actual book file – similar to requesting a book in meatspace by turning in a catalog card to a librarian. Adobe Digital Editions is used to perform this exchange. As one would expect from Adobe, this software does not support Linux.

Back in 2013 I setup a Windows 7 virtual machine with Adobe Digital Editions v2.0.1.78765, which I used exclusively for turning ACSM files into EPUB files. A few months ago I was finally able to retire that VM thanks to the discovery of libgourou, which is both a library and a suite of utilities that can be used to work with ACSM files.

To use, I first register an anonymous account with Adobe.

$ adept_activate -a

Next I export the private key that the files will be encrypted to.

$ acsmdownloader --export-private-key

This key can then be imported into the DeDRM_tools plugin of Calibre.

Whenever I receive an ACSM file, I can just pass it to the acsmdownloader utility from libgourou.

$ acsmdownloader -f foobar.acsm

This spits out the EPUB, which may be imported into my standard Calibre library.

2024-06-28

edc, crypto

YubiKey Replacement

Since I began using a YubiKey for PGP operations in 2015, I’ve always kept a spare YubiKey locked away with my USB Armory, in case the one on my keychain failed. While performing my annual key renewal this month I decided it was time to switch to the spare YubiKey. My old one still works, but it often takes a few attempts to read.

Both YubiKeys are 9 years old. But one has spent those 9 years locked away, while the other spent every day of those 9 years in my pocket (and saw repeated use on most of those days). The new one always works on the first attempt, and it fits into USB ports with a comforting amount of friction. The old one had been worn down so much that it often just falls out of ports if it isn’t being held in. (My calipers measure the front contact area of the old YubiKey at 2.26mm thick, where the new one is 2.40mm.) I’m glad to know that YubiKeys can reliably work for nigh a decade, but next time maybe I’ll start to think about replacing this one after around 5 years of EDC rather than 10.

I was pleasantly surprised to discover that modern versions of GnuPG are happy to use different cards for the same key, so you no longer need to delete keygrip files when switching cards.

2024-06-05

bicycle, gear

Hafny FR03 Jones Bar Mirror

I tried a few different mirrors on my Jones Loop H-Bars.

The D+D Oberlauda UltraLite Bike Mirror mounted underneath the bars just before the weld worked decently, but the mirror’s clamp is annoying when you want to rest your hand on top of that part of the bar.

After further trials, I developed a preference for the Hafny HF-M951B-FR03. This opinion is shared by others.

The FR03 uses the same high quality glass and mount as the FR06 model Hafny on my road bike, but the two models have slight differences. The mirror of the FR03 is round, where the FR06 has a subtle teardrop shape. The bracket which connects the FR03 to the bar plug attaches to the edge of the mirror, where on the FR06 the bracket attaches in the center of the rear of the mirror. These differences make the FR03 better suited to flat bars, and the FR06 better suited to drop bars.

A bike with Jones bar is a wide load, and a bar-end mirror makes it even wider. I compensate for this by only having a left-side mirror, which gets the job done. I also keep the adjustment bolt loose enough that I can tilt the mirror into the bars if I’m squeezing through a narrow passage.