Air

☁️ Live reload for Go apps

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Motivation

When I get started with developing websites in Go and gin framework, it's a pity that gin lacks live-reloading function. In fact, I tried fresh and it seems not much flexible, so I intended to rewrite it in a better way. Finally, Air's born. In addition, great thanks to pilu, no fresh, no air :)

Air is yet another live-reloading command line utility for Go applications in development. Just air in your project root directory, leave it alone, and focus on your code.

NOTE: This tool has nothing to do with hot-deploy for production.

Features

• Colorful log output
• Customize build or ary command
• Support excluding subdirectories
• Allow watching new directories after Air started
• Better building process

✨ beta feature

Support air config fields as arguments:

if you just want to config build command and run command, you can use like following command without config file:

air --build.cmd "go build -o bin/api cmd/run.go" --build.bin "./bin/api"

use a comma to separate items for arguments that take a list as input:

air --build.cmd "go build -o bin/api cmd/run.go" --build.bin "./bin/api" --build.exclude_dir "templates,build"

Installation

Prefer install.sh

# binary will be $(go env GOPATH)/bin/air
curl -sSfL https://raw.githubusercontent.com/cosmtrek/air/master/install.sh | sh -s -- -b $(go env GOPATH)/bin

# or install it into ./bin/
curl -sSfL https://raw.githubusercontent.com/cosmtrek/air/master/install.sh | sh -s

air -v

P.S. Great thanks mattn's PR for supporting Windows platform.

Via go install

With go 1.16 or higher:

go install github.com/cosmtrek/air@latest

Docker

Please pull this docker image cosmtrek/air.

docker run -it --rm \
    -w "<PROJECT>" \
    -e "air_wd=<PROJECT>" \
    -v $(pwd):<PROJECT> \
    -p <PORT>:<APP SERVER PORT> \
    cosmtrek/air
    -c <CONF>

For example, one of my project runs in docker:

docker run -it --rm \
    -w "/go/src/github.com/cosmtrek/hub" \
    -v $(pwd):/go/src/github.com/cosmtrek/hub \
    -p 9090:9090 \
    cosmtrek/air

Usage

For less typing, you could add alias air='~/.air' to your .bashrc or .zshrc.

First enter into your project

cd /path/to/your_project

The simplest usage is run

# firstly find `.air.toml` in current directory, if not found, use defaults
air -c .air.toml

You can initialize the .air.toml configuration file to the current directory with the default settings running the following command.

air init

After this you can just run the air command without additional arguments and it will use the .air.toml file for configuration.

air

For modifying the configuration refer to the air_example.toml file.

Runtime arguments

You can pass arguments for running the built binary by adding them after the air command.

# Will run ./tmp/main bench
air bench

# Will run ./tmp/main server --port 8080
air server --port 8080

You can separate the arguments passed for the air command and the built binary with -- argument.

# Will run ./tmp/main -h
air -- -h

# Will run air with custom config and pass -h argument to the built binary
air -c .air.toml -- -h

Docker-compose

services:
  my-project-with-air:
    image: cosmtrek/air
    # working_dir value has to be the same of mapped volume
    working_dir: /project-package
    ports:
      - <any>:<any>
    environment:
      - ENV_A=${ENV_A}
      - ENV_B=${ENV_B}
      - ENV_C=${ENV_C}
    volumes:
      - ./project-relative-path/:/project-package/

Debug

air -d prints all logs.

Installation and Usage for Docker users who don't want to use air image

Dockerfile

# Choose whatever you want, version >= 1.16
FROM golang:1.19-alpine

WORKDIR /app

RUN go install github.com/cosmtrek/air@latest

COPY go.mod go.sum ./
RUN go mod download

CMD ["air", "-c", ".air.toml"]

docker-compose.yaml

version: "3.8"
services:
  web:
    build:
      context: .
      # Correct the path to your Dockerfile
      dockerfile: Dockerfile
    ports:
      - 8080:3000
    # Important to bind/mount your codebase dir to /app dir for live reload
    volumes:
      - ./:/app

Q&A

"command not found: air" or "No such file or directory"

export GOPATH=$HOME/xxxxx
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
export PATH=$PATH:$(go env GOPATH)/bin <---- Confirm this line in you profile!!!

Error under wsl when ' is included in the bin

Should use \ to escape the `' in the bin. related issue: #305

Development

Please note that it requires Go 1.16+ since I use go mod to manage dependencies.

# 1. fork this project

# 2. clone it
mkdir -p $GOPATH/src/github.com/cosmtrek
cd $GOPATH/src/github.com/cosmtrek
git clone git@github.com:<YOUR USERNAME>/air.git

# 3. install dependencies
cd air
make ci

# 4. explore it and happy hacking!
make install

BTW: Pull requests are welcome~

Release new version

# 1. checkout to master
git checkout master

# 2. add the version that needs to be released
git tag v1.xx.x

# 3. push to remote
git push origin v1.xx.x

the ci will processing and will release new version,wait about 5 min you can fetch the new version.

Sponsor

Huge thanks to the following supporters. I've always been remembering your kindness.

• Peter Aba
• Apostolis Anastasiou
• keita koga

License

GNU General Public License v3.0