docker-recipe-find

#!/usr/bin/env bash

set -e

DOCKER_RECIPE_BASE="$( cd "$(dirname "$0")" ; pwd -P )"
DOCKER_RECIPE_PATH=${DOCKER_RECIPE_PATH-"$DOCKER_RECIPE_BASE/recipes"}
DOCKER_RECIPE_OS=${DOCKER_RECIPE_OS-"debian"}

# Resolving recipe file
#
# Usage:
#
#       docker_recipe_find foo
#
# Looks for:
#
# - foo.debian.sh
# - foo.sh
# - foo.debian.df
# - foo.df
# - foo/ (directory)
#
# If "debian" is the current  DOCKER_RECIPE_OS.
# In case of an directory it will return all files that are in there on the first level.
#
function docker_recipe_find() {
    # Security: disallow walking into another directory
    templateBase=${DOCKER_RECIPE_PATH}/${1//\.\./}

    # Resolve sh first then normal df files using os specific before general recipes.
    for extension in ${DOCKER_RECIPE_OS}.sh sh ${DOCKER_RECIPE_OS}.df df; do
        if [[ -f ${templateBase}.${extension} ]]; then
            echo ${templateBase}.${extension};
            return;
        fi
    done

    # Including a whole directory is possible too.
    if [[ -d $templateBase ]]; then
        ls ${templateBase}/*.df ${templateBase}/*.sh 2>/dev/null
        return
    fi

    echo "Could not resolve $1" >& 2
    exit 1
}

if [[ ! -z "$1" ]]; then
    docker_recipe_find $1
    exit $?
fi