Albertyw.com

Linters

January 2, 2023

A list of linters that I use for my projects:

Language	Linter
Python	black
Python	flake8
Go	GoVet
Go	Staticcheck
Go	Errcheck
Go	Golangci-lint
Javascript	eslint
Bash	Shellcheck
Makefile	Checkmake
Dockerfile	Hadolint
Nginx	Gixy
Vimscript	vint
LaTeX	chktex

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Installing Mysqlclient in Python Slim Docker Image

December 29, 2022

Installing the mysqlclient python package in a python:3.11-slim docker container fails because the slim version leaves out the libraries needed to compile mysqlclient. Rather than using the full python:3.11 base image that is much larger, you can install the mysqlclient dependencies manually:

FROM python:3.11-bullseye

# Install mysqlclient debian package dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
   libmariadb-dev-compat gcc                   `: MySQL client` \
&& rm -rf /var/lib/apt/lists/*

# Install mysqlclient python package
RUN pip install --no-cache-dir mysqlclient

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Processor Trends

December 19, 2022

42 Years of Processor Data

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Resizing a Ubuntu Disk in a UTM VM

October 19, 2022

UTM is an awesome virtualization system based on QEMU built for M1 (ARM) Macs. v4.0.8 of UTM, the first v4 stable release, came out today with support for resizing QEMU disk images but while the UTM docs show how to resize the UTM machine, there’s several more steps to get the virtualized file system to recognize the additional disk space.

For an Ubuntu guest OS running a default GPT and LVM partition:

On a shut down VM, in the UTM UI’s configuration, select the disk you wish to expand, resize the disk, and save the VM configuration.
Launch the VM and get a terminal
Run sudo fdisk -l and confirm that there is a GPT PMBR Size Mismatch will be corrected by w(rite) warning
Run sudo parted -l and gparted should ask to automatically fix the size mismatch. Fix the size mismatch.
Run sudo lvm to get an lvm console
Run lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv to expand the lvm logical volume
Exit the lvm console
Run sudo resize2fs /dev/ubuntu-vg/ubuntu-lv to expand the ext4 file system to the logical volume
Run df -h to confirm that the /dev/mapper/ubuntu--vg-ubuntu--lv has been expanded.

References:

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Bash File Test Operators

October 5, 2022

Usage Example:

if [[ -e "$file" ]]; then
  echo "pass"
else
  echo "does not pass"
fi

Operator	Meaning
`-e`	File exists
`-s`	File exists and is not empty
`-d`	File exists and is a directory
`-f`	File exists and is a regular file
`-v`	Variable is set and been assigned a value
`-z`	String is zero
`-n`	String is non-zero

Reference (Bash Man Page)

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Notes

Linters

Installing Mysqlclient in Python Slim Docker Image

Processor Trends

Resizing a Ubuntu Disk in a UTM VM

Bash File Test Operators