tips

• tips
  • git branch at bash prompt
  • tagging docker compose intermediate images
  • docker command aliases
  • bash prompt in docker container
    • Solution:
  • serde and diesel derive attributes
  • fragment collection parser in combine

git branch at bash prompt

To show git branch at bash prompt,

Add like $(__git_ps1 ">%s") to PS1 of ~/.bashrc:

tagging docker compose intermediate images

To name each intermediate image of a service of a Compose project,

first name each build stage AS {stage} in {project}/{service}/Dockerfile:

FROM image AS stage

Then in {project}/{service} dir, build and tag the image targeting {stage}.

docker build . -t $(basename $(dirname $(pwd)))_$(basename $(pwd)):{stage} --target {stage}

The image will be tagged as {project}_{service}:{stage}.

For alias dbt, see here.

docker command aliases

Here is my docker aliases.

To use this, add to ~/.bash_aliases as follows:

. {}/tips/snip/.bash_aliases/.hub.sh

For # myfunc, see the script of the same name here.

If you want to use your own function like this, don't forget to add to ~/.bashrc as follows:

. {}/tips/snip/.bashrc/.hub.sh

bash prompt in docker container

Here is 2 way to interact with a running container:

• docker run -it IMAGE COMMAND
• docker exec -it CONTAINER COMMAND

First, run salmon container of rice image. Then...

Holy shit, what a surprising white prompt!

This prompt is the PS1 itself of CONTAINER:~/.bashrc.

No matter how many times it is overwritten, it will return to white next time.

Bye, my ephemeral PS1...

Solution:

Add to CONTAINER:~/.bashrc and restart bash:

docker run -ite "DOCKER_PS1='$docker_ps1'" {IMAGE} bash -c 'echo "PS1=$DOCKER_PS1" >>~/.bashrc && bash -l'

Here is the code I'm actually using, which gives the following result:

Hello, my pseudo-persistent PS1!

Let's look at the container counting down on run -it (left) from exec -it (right).

serde and diesel derive attributes

actix-web API and DB peripherals, that is, serde and diesel derive attributes are:

• serde
  • Ser ialize
  • De serialize
• diesel
  • Insertable
  • Queryable
  • Identifiable
  • AsChangeset

If used correctly, it could prevent the following:

• Accidentally send x to the outside
• Accidentally update x

fragment collection parser in combine

A parser that combines pieces of information into a single struct

Here is snip.

Thank you for reading!