DEV Community: tarohida

How to define your own custom sub-command to gcloud command

tarohida — Sun, 14 Apr 2024 02:56:13 +0000

Introduction

I want to run gcloud compute instances list command like this:

gcloud list

I couldn't find how to extend gcloud command offisialiy, so I extend gcloud command by to define alias to .bashrc file.

Define wrapper and alias

Define below in your .bashrc file

gcloud-wrapper () {
    if [ "$1" = "switch" ]; then
        gcloud config set project "$2"
    elif [ "$1" = "list" ]; then
        if [ "$2" = "instances" ]; then
            gcloud compute instances list
        elif [ "$2" = "ip" ]; then
            gcloud compute instances list --format="table(NAME,EXTERNAL_IP)" --filter="EXTERNAL_IP:*"
        fi
    elif [ "$1" = "start" -o "$1" = "up" ]; then
        gcloud compute instances start $2
    elif [ "$1" = "stop" ]; then
        gcloud comupte instances stop $2
    else
        gcloud "$@"
    fi
}

alias gcloud="gcloud-wrapper"

You can extend more to add elif [ "$1" = "list" ]; then line.

If sub command not defined, wrapper run original gcloud command, and you also can use original gcloud command.

How to use in dotfiles

Here is my dotfiles.

You can use solution in your dotfiles.

https://github.com/tarohida/dotfiles/blob/develop/bashrc.d/96-gcloud.sh

My Original Article (in Japanese)

https://qiita.com/taro-hida/items/97c765cf8bfaf967830a

Thank you for your reading.

Error on appleboy/ssh-action. dial tcp: lookup example.example on 192.0.2.1:53: i/o timeout

tarohida — Wed, 19 Jan 2022 04:24:23 +0000

Problem

One day, I get Error like below.

2022/01/18 22:51:31 dial tcp: lookup example.example on 192.0.2.1:53: read udp 192.0.2.2:37138->192.0.2.1:53: i/o timeout

i/o timeout · Issue #32 · appleboy/ssh-action

I found this nearly issue. But error in this issue is about 22 port.

My error is about 53 port.

Just be sure, I recreate and replace ssh key. But Problem was not solved.

How to solve it

I think it is related to DNS, so I change host address from domain name to IP address.

And then, pipeline finished successfully.

I don't know cause, but problem was solved.

      uses: appleboy/ssh-action@master
      with:
        host: ${{ secrets.HOST }}
        username: ${{ secrets.USER }}
        key: ${{ secrets.KEY }}
        port: 22

Additional Information

I replaced actual IP address and domain name to example IP address and domain name.

How to fix wrong mapping of namespace in PhpStorm

tarohida — Wed, 24 Nov 2021 23:48:36 +0000

Problems

PhpStorm mapped directories to wrong namespace.

I updated composer.json, but it won't work.

I ran composer install|update|dump-autoload, but it also won't work.

How to solve

I could fix mapping of namespace and directories with this instruction.

Configure PHP namespaces in a project | PhpStorm

Environment

PhpStorm 2021.1.4

When I run `exit` command in bash function, how it works.

tarohida — Fri, 26 Feb 2021 12:40:12 +0000

Environment

bash

Problems

I don't know how it works when I exec exit command in bash function.
- exit function or exit script?
- What will the exit code look like?

How to solve

I actually did it, and found out below.

script execution ended.
exit code will be set to exit code specified by exit command.

Description

cat << EOF > a.sh
exit_func () {
    exit 0
}

exit_func
echo 'execute here!'
EOF

sh ./a.sh
echo $?

output

cat << EOF > b.sh
exit_func_254 () {
    exit 254
}

exit_func_254
echo 'execute here!'
EOF

sh ./b.sh
echo $?

output

Reference

https://linuxize.com/post/bash-functions/

When I expand shell variable which have tab chars or space chars, how it works.

tarohida — Thu, 25 Feb 2021 13:05:38 +0000

Environment

bash

Problems

When I defined shell values such below, how is space chars or tab chars in variable processed?

packages='
    httpd
    postgresql
    redis
'

yum install ${packages}

How to solve

It is expanded to yum httpd postgresql redis, and it works as expected.

Description

Let's see how it is expanded with using echo command.

#!/bin/bash
# your code goes here

packages='
    httpd
    postgresql
    redis
'

echo ${packages}
echo '${packages}'
echo "${packages}"

output

httpd postgresql redis
${packages}

    httpd
    postgresql
    redis

https://ideone.com/XfbkBI

When I quote variable with double quote, it expand, but tab characters or space characters does not replaced with single space.

docker-compose `/docker-entrypoint.sh: exec: line 24: require: not found`

tarohida — Fri, 29 Jan 2021 11:13:16 +0000

Environment

Ubuntu 18.04 LTS
Docker Composer Container

Problem

run follow command.

docker-compose run composer require phpunit/phpunit

got error.

/docker-entrypoint.sh: exec: line 24: require: not found

How to solve it.

remove composer.json file.

$ rm ./composer.json

and re-run. succeeded.

docker-compose run composer require phpunit/phpunit

Description.

when I run --help command, i got Execption Output.

$ docker-compose run composer --help


  [Seld\JsonLint\ParsingException]                                        
  "./composer.json" does not contain valid JSON                           
  Parse error on line 1:                                                  

  ^                                                                       
  Expected one of: 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '['

composer.json file is empty.

$ cat ./composer.json
$