githasdiff

Small python script to search for changes using fnmatch patterns to filter git diff HEAD~. The principal objective is make build processes faster checking whats changes before build projects/services.

• The script exits with 0 when changes are found and 1 otherwise.
• If script receives a command, it will be executed and exits with command exit code.

Inspired by dockerfiles test script from Jess Frazelle.

Configuration

Create a json file named .githasdiff.json with include and exclude patterns for each project/service/build:

{
    "project_a": {
        "include": [
            "project_a/*.py"
        ],
        "exclude": [
            "project_a/extra_scripts/*.py"
        ]
    }
}

Global patterns can be defined in same file:

{
    "include": [
        "*.py"
    ],
    "exclude": [
        "*.md"
    ]
}

Observations:

• Global patterns will be always used to search for changes.
• exclude has priority over include patterns, so first exclude, then matches.
• If include patterns list is omitted, then script will considerate ["*"] as include list pattern.

It's also possible use an env var GITHASDIFF_FILE to set the path to json config file, and an env var GITHASDIFF_COMMAND to set command to check for diff.

Install

curl -L https://github.com/pyanderson/githasdiff/releases/download/1.0.4/githasdiff > ./githasdiff
chmod +x ./githasdiff

Run

Using if/else:

if ./githasdiff project_a; then docker build -t project_a project_a/; else exit 0; fi

Using the command as args:

./githasdiff project_a docker build -t project_a project_a/

Examples

Check .githasdiff.json for configuration and .travis.yml for running.