robvanderleek

#!/usr/bin/env python
# Prunes folder (all object versions and delete markers) on S3
import boto3
import sys

if len(sys.argv) != 3:
    print('usage: {} <bucket> <prefix>'.format(sys.argv[0]))
    sys.exit(1)

if sys.argv[2] == '/':

robvanderleek

Auto-merge Dependabot Pull-Requests

Since Dependabot was acquired by GitHub the native Dependabot auto-merge functionality stopped working, This is a way to re-enable that functionality for a repository.

1. Create a Dependabot configuration YAML (look here for the syntax) for your repository in .github/dependabot.yml, for example:

version: 2
updates:
- package-ecosystem: npm

robvanderleek

Simple RTSP test server

Sometims you just need to have a local RTSP stream to test your software against. The attached script start-rtsp-stream.sh does just that. It requires Docker and ffmpeg and can be launched with zero arguments to give you an RTSP stream of a looped video:

$ ./start-rtsp-stream.sh
Stopping server (if running)...
Starting simple RTSP server...
Starting video stream at: rtsp://localhost:8554/live.stream

robvanderleek

#!/usr/bin/env node
const fs = require('fs');
const os = require('os');
const path = require('path');

function usage() {
    console.log(
        'Backpack usage:\n' +
        '  Put in backpack: bp -i <filename>\n' +
        '  Get from backpack: bp -e <filename>\n')

robvanderleek

diff --git a/index.js b/index.js
index 3cbc816..03e0acb 100755
--- a/index.js
+++ b/index.js
@@ -6,6 +6,7 @@ const path = require('path');
 function usage() {
     console.log(
         'Backpack usage:\n' +
+        '  List files in backpack: bp -l\n' +
         '  Put in backpack: bp -i <filename>\n' +

robvanderleek

Show current Git branch in iTerm2

If you want your iTerm2 terminal window display the current Git branch (when the current directory is inside a Git repository of course) add the following to your .zshrc:

set_terminal_title() {

robvanderleek

AWS SSO command-line login script (that also updates .aws/credentials)

The AWS Command Line Interface tool from Amazon (for macOS available here on Homebrew) makes it possible to login to AWS through a SSO (Single Sign-On) identity provider such as Okta. However, if you login via "aws sso login" the AWS credentials file (located at ~/.aws/credentials) is not updated, this is a problem for tools/libraries that rely on that file.

This script is a wrapper around aws sso login that also updates the .aws/credentials file. It only requires AWS CLI and Python 3 to run.

Configuration

Make sure your .aws/config file has a section (or multiple sections) that have SSO configuation options. For example:

robvanderleek

#!/bin/bash
IFS=
banner=`cat /dev/stdin | figlet -w 999`
columns=`tput cols`
spacer=`cat /dev/zero | head -c $columns | tr '\0' ' '`
banner_with_spacer=`echo $banner | sed "s/^/$spacer/"`
banner_length=`echo $banner_with_spacer | awk '{print length}' | head -n 1`
start_index=1
while true
do

robvanderleek

#!/bin/tcsh
IFS=:
set tempfile=`mktemp`
cat /dev/stdin | figlet -w 999 > $tempfile
set columns=`tput cols`
set spacer_cmd="cat /dev/zero | head -c $columns | tr '\0' ' '"
sed -i.bak "s/^/`$spacer_cmd`/" $tempfile
set banner_length=`cat $tempfile | awk '{print length}' | head -n 1`
set start_index=1
while (1)

robvanderleek

Fixing a cascading delete problem in SQLAlchemy

Recently I spent two days figuring out why a seemingly trivial use of a cascading delete relationship in SQLAlchemy did not work properly, eventually I found the answer in this StackOverflow post. Because it was a real puzzler I've created this short writing, perhaps it can be of help to someone facing the same problem someday.

The context of the problem is very simple: there are two tables (Parent and Child), each Parent can only have one Child and when a Parent row is deleted the associated Child row should also be deleted.

This is how that looks in SQLAlchemy Python code:

class Child(Base):