dimo414

git clone supports several different types of checkouts, notably including --separate-git-dir and --bare. The former works exactly like a vanilla checkout except the .git directory is located elsewhere than directly in the working tree. However --bare creates a different kind of repository, significantly it disables the reflog and changes the default refspec for fetch.

Both of these make --bare a poor choice for a repository you intend to develop against, such as via worktrees. If you just want a "bare" repository directory it is simpler[^1] to:

dimo414

This article includes setup instructions for the Raspberry Pi camera, but doesn't capture setting it up as a service (even though a few lines up it sets up OctoPrint as a service), and instead provides a pair of relatively-complex scripts to be run at startup via /etc/rc.local.

Setup

• copy webcam.sh to the mjpg-streamer directory (or wherever you'd like, just update the MJPG_DIR variable)
• copy pi-webcam.service to /etc/systemd/system/ (requires sudo), ensure ExecStart points to the correct path

dimo414

#!/bin/bash
# Checks that a Plex server is up. For devices on a local network your
# router may have created [hostname].local or [hostname].lan DNS entries;
# otherwise you can pass an IP address or ensure your server is remotely
# accessible (https://support.plex.tv/articles/200931138/).
#
# See also
# https://old.reddit.com/r/PleX/comments/7qolre/what_do_others_do_to_monitor_plex_health/
# https://support.plex.tv/articles/201638786-plex-media-server-url-commands/
#

dimo414

Expanding Bash arrays safely with set -u

Prior to Bash 4.4 set -u treated empty arrays as "unset", and terminates the process. There are a number of possible workarounds using array parameter expansion, however almost all of them fail in certain Bash versions.

This gist is a supplement to this StackOverflow post.

dimo414

Build the Luit/dogebot binary (I prefer to do so in a Docker container) for ARM:

$ docker run -v /tmp:/mnt/tmp -it debian:testing
docker$ apt-get update && apt-get install -y git golang
# Ensure build dependencies are available locally
docker$ go get github.com/Luit/dogebot/src/dogebot
docker$ git clone https://github.com/Luit/dogebot
docker$ cd dogebot/src/dogebot
# Build a Raspberry Pi binary

dimo414

#!/bin/bash
#
# Helper utility to simplify using Bash's getopts utility, and make it usable with functions.
#
# Example usage:
# foo() {
#   local _usage=...                # optional usage string
#   eval "$(parse_opts 'ab:f:v')"   # provide a standard getopts optstring
#   echo "f is $f"                  # opts are now local variables
#   if (( a )); then                # check boolean flags with (( ... ))

dimo414

#!/bin/bash
# Queries the given Healthchecks.io project/tags, and sets a blink(1)
# based on the results.
#
# Suggest running once per minute via cron.

URL_F='https://healthchecks.io/badge/%s.json'
all_counts=()

blink() {

dimo414

#!/bin/bash
# Source: https://gist.github.com/dimo414/10d6f162fb6d72f517a041d28d92314f
#
# This is a basic heartbeat monitoring script suitible for adding to
# a machine's crontab to receive alerts (via https://healthchecks.io)
# when the machine is unhealthy.
#
# I use it to keep an eye on my headless Raspberry Pi, but it should
# work for most Linux machines.
#

dimo414

class DefaultCapturingNamespace(argparse.Namespace):
  """An argparse Namespace that tracks the number of times the given argument
  has been set. In theory this can allow you to distinguish between values
  set by argparse (e.g. default values) and those specified by the user.
  """
  def __init__(self, **kwargs):
    type_name = type(self).__name__
    argparse.Namespace.__setattr__(self, '_%s__original_values' % type_name, {})
    argparse.Namespace.__setattr__(self, '_%s__set_counts' % type_name, {})

dimo414

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;