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Check if there is shell command output

Consider the following scenario:

Problem The execution of a shell command (Radon in this example) does not retrieve an status code different to 0 when there is output (if there is output there are issues). The command does not gives parameter to handle it.

Simple solution

Check if the length of the output is non empty (-n).

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https://github.com/php/php-src/blob/master/php.ini-production

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Display raw images from Google Drive

https://drive.google.com/uc?export=view&id={fileId} where file ID is the unique hash Google Drive gives when the shared link is created.

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#
# Avoid the message 'External file changes sync may be slow: The current inotify(7) watch limit is too low.' from JetBrains products.
#
# 1. Create the file /etc/sysctl.d/60-jetbrains.conf and paste this code
# 2. Restart the sysctl service: sudo sysctl -p --system
# 3. Restart the IDE
#
# More info:
# https://youtrack.jetbrains.com/articles/SUPPORT-A-1715/Inotify-Watches-Limit-Linux

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Simple multi cloud Docker cluster using Docker Swarm

This guide explains how to create a simple multi cloud Docker cluster using Docker Swarm, Docker Machine and the three top cloud providers nowadays - Google Compute Engine, Microsoft Azure and AWS.

Prerequisites

This guide assumes you have a Linux host with Docker CE installed. If you are using Docker for Mac or Docker for Windows you can avoid the Docker Machine set up since it comes included.

Install Docker Machine

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Python docstring reStructuredText style

Python Signatures

Signatures of functions, methods and class constructors can be given like they would be written in Python.

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ARG PHP_VERSION=7.2-fpm-stretch
ARG COMPOSER_VERSION=latest

# builder stage
FROM php:$PHP_VERSION AS builder

ARG AMQP_VERSION=1.9.3
ARG PHPREDIS_VERSION=4.1.1

RUN apt-get update && apt-get install -y --no-install-recommends --no-install-suggests \

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Git tag regex validation using Makefile

This is a portion of a Makefile where I select a Git tag, validate its name using regular expresion and build a Docker image with it as tag.

# it is evaluated when is used (recursively expanded variable)
# https://ftp.gnu.org/old-gnu/Manuals/make-3.79.1/html_chapter/make_6.html#SEC59
git_tag = $(shell git describe --abbrev=0 --tags)
# Semantic versioning format https://semver.org/
tag_regex := ^v([0-9]{1,}\.){2}[0-9]{1,}$

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#!/bin/bash

#
# Delete the whole data created by the user. TAKE CARE!!!
#

# kill all running containers
docker kill $(docker ps -q)

# delete all containers

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Edit go version in go.mod

go mod edit -go=<GO_VERSION>

Example:

go mod edit -go=1.24