Trans Scend Survival

Trans: Latin prefix implying "across" or "Beyond", often used in gender nonconforming situations – Scend: Archaic word describing a strong "surge" or "wave", originating with 15th century english sailors – Survival: 15th century english compound word describing an existence only worth transcending.

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Ubuntu on Captive Portal WiFi

wget https://raw.githubusercontent.com/Jesssullivan/misc/master/sel/portal.py

Some distros (Ubuntu and its derivatives on my Macbook for instance) struggle to find a route to the captive portal on public networks (read: Starbucks). Assuming you want to connect the way they intend (via the gateway through the captive portal) because you are a rule abiding patron, all you need to do is visit the address of the gateway. There is no need to fiddle with your network drivers, disable SSL stuff or engage in plebian network tomfoolery.

"""
find and open wifi captive portal (such as Starbucks)
written by Jess Sullivan
"""
from netifaces import gateways
from sys import argv
from time import sleep
import subprocess

help_str = str("\n " +
               'usage: \n ' +
               ' -h : print this message again \n' +
               ' -i : `pip3 install netifaces`  \n' +
               'You may specify a browser argument to complete the portal, such as \n' +
               'google-chrome')

def argtype():
    try:
        if len(argv) > 1:
            use = True
        elif len(argv) == 1:
            use = False
            print(help_str)
        else:
            print('command takes 0 or 1 args, use -h for help')
            raise SystemExit
    except:
        print('arg error... \n command takes 0 or 1 args, use -h for help')
        raise SystemExit
    return use

def main():

    all_gates = gateways()
    target = all_gates['default'][2][0]

    if argtype():

        if argv[1] == '-h':
            print(help_str)
            quit()

        if argv[1] == '-i':
            try:
                subprocess.Popen('pip3 install netifaces',
                                 shell=True,
                                 executable='/bin/bash')
                sleep(1)
                quit()
            except:
                print('err running pip3 install netifaces')
                quit()

        else:

            print(str('opening portal in ' + argv[1]))
            subprocess.Popen(str(argv[1] + ' ' + str(target)),
                             shell=True,
                             executable='/bin/bash')
            sleep(1)
            quit()

    else:

        print(str('\n please visit address ' + target +
                  ' in a browser to complete portal setup \n'))
        quit()

main()

More Morning Metal

I haven't posted a Morning Metal on Soundcloud for a while- glad to break the lull. xD
-Jess

JDK Management in R

Quickly & forcefully manage extra JDKs in base R
Simplify rJava woes

# get this script:
wget https://raw.githubusercontent.com/Jesssullivan/rJDKmanager/master/JDKmanager.R

rJava is depended upon by lots of libraries- XLConnect, OpenStreetMap, many db connectors and is often needed while scripting with GDAL.

library(XLConnect)   # YMMV

Errors while importing a library with depending on a JDK are many, but can (usually) be resolved by reconfiguring the version listed somewhere in the error.

On mac OSX (on Mojave at least), check what you have installed here- (as admin, this is a system path) :

sudo ls  "/Library/Java/JavaVirtualMachines/ 

I seem to usually have at least half a dozen or more versions in there, between Oracle and openJDK. Being Java, these are basically sandboxed as JVMs and are will not get in each others way.

However...

Unlike JDK configuration for just about everything else, aliasing or exporting a specific release to $PATH will not cut it in R. The shell command to reconfigure for R-

sudo R CMD javareconf

...seems to always choose the wrong JDK. Renaming, hiding, otherwise trying to explain to R the one I want (lib XLConnect currently wants none other than Oracle 11.0.1) is futile.
The end-all solution for me is usually to temporarily move other JDKs elsewhere.
This is not difficult to do now and again, but keeping a CLI totally in R for moving / replacing JDKs makes for organized scripting.

 JDKmanager help: 
 (args are not case sensitive) 
 (usage: `sudo rscript JDKmanager.R help`) 

 list    :: prints contents of default JDK path and removed JDK path 
 reset   :: move all JDKs in removed JDK path back to default JDK path 
 config ::  configure rJava.  equivalent to `R CMD javareconf` in shell 

 specific JDK, such as 11.0.1, 1.8,openjdk-12.0.2, etc: 
    searches through both default and removed pathes for the specific JDK.  
    if found in the default path, any other JDKs will be moved to the `removed JDKs` directory. 
    the specified JDK will be configured for rJava.

QEMU for Raspian ARM!

Updated 11/6/19

Visit the repo on Github here-
https://github.com/Jesssullivan/QEMU-Raspian

tested on Mac OSX 10.14.6

Emulates a variety of Raspian releases on proper ARM hardware with QEMU.

Prerequisites:

QEMU and wget (OSX homebrew)

brew install qemu wget

Get the Python3 CLI in this repo:

wget https://raw.githubusercontent.com/Jesssullivan/USBoN/master/QEMU_Raspian.py

Usage:

After the first launch, it will launch from the persistent .qcow2 image.

With no arguments & in a new folder, Raspian "stretch-lite" (no desktop environment) will be:

  • downloaded as a zip archive with a release kernel
  • unarchived --> to img
  • converted to a Qcow2 with 8gb allocated as disk
  • launched from Qcow2 as administrator
sudo python3 QEMU_Raspian.py 

Optional Arguments:

  • -h prints CLI usage help
  • -rm removes ALL files added in dir with QEMU_Raspian.py
  • stretch uses standard graphical stretch release with GUI
  • stretchlite for stretchlite release [default!]
  • buster for standard graphical buster release [YMMV]
  • busterlite for busterlite release [YMMV]
# examples:
sudo python3 QEMU_Raspian.py busterlite
python3 QEMU_Raspian -h  # print help

Burn as .img:

qemu-img convert -f qcow2 -O raw file.qcow2 file.img

Four Pi Emulations ala QEMU

…To Lasercut / 3DP a Really Accurate Coil Winder

See the repo here:
https://github.com/Jesssullivan/maggen/tree/master/coilbot_ArduinoRampsDriver
Parent here:
https://github.com/subatomicglue/maggen
Added Sketchup Viewer 10/17/19- see below

Parent machine:
undefined

...Adding a parametric (wire gauge, coil bobbin width, stepper resolution) guide:



...More to come soon xD

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