93 lines
3.3 KiB
Bash
Executable File
93 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
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# ┃ 🐳 Podman Build Script with Layered .env Configuration ┃
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# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
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#
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# This script builds a Podman image using a specified Dockerfile,
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# dynamically injecting build-time environment variables from a
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# prioritized set of `.env` files.
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#
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# ──────────────── Behavior ────────────────
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# - Loads variables from the following files (in order):
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# build.env
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# build.env.${BUILD_ENV}
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# build.local.env
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#
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# - Later files override earlier ones (last-write-wins)
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# - Variables starting with `BUILD_ENV` are excluded from build args
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#
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# ──────────────── Required Environment Variables ────────────────
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# - BUILD_ENV: (optional) Environment name (e.g. dev, prod)
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# - BUILD_ENV_DOCKER_FILE: Dockerfile to use (default: Dockerfile)
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# - BUILD_ENV_IMAGE_TAG: Tag to assign to the built image
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#
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# ──────────────── Example Usage ────────────────
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# BUILD_ENV=dev BUILD_ENV_IMAGE_TAG=myapp:dev ./build.sh
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# BUILD_ENV=prod BUILD_ENV_DOCKER_FILE=Dockerfile.prod BUILD_ENV_IMAGE_TAG=myapp:prod ./build.sh
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#
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# ──────────────── Output ────────────────
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# - Logs each loaded file
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# - Displays the final build command
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# - Executes the podman build with all resolved --build-arg flags
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#
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# Author: Márcio
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# Last Updated: September 2025
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POSSIBLE_BUILD_ARGS_FILES="\
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build.env \
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"
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if [ -n "${BUILD_ENV+x}" ]; then
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POSSIBLE_BUILD_ARGS_FILES="$POSSIBLE_BUILD_ARGS_FILES \
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build.env.${BUILD_ENV} \
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"
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fi
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POSSIBLE_BUILD_ARGS_FILES="$POSSIBLE_BUILD_ARGS_FILES \
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.build.local"
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# load variables into this context
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declare -A build_args_map
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BUILD_ARGS=""
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for file in $POSSIBLE_BUILD_ARGS_FILES; do
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if [ -f "$file" ]; then
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echo "🔧 Loading variables from $file"
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set -a
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source "$file"
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set +a
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while IFS= read -r line || [ -n "$line" ]; do
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# Skip comments and empty lines
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[[ "$line" =~ ^#.*$ || -z "$line" ]] && continue
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# Extract key and value
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key="$(echo "$line" | cut -d= -f1 | xargs)"
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value="$(echo "$line" | cut -d= -f2- | xargs)"
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# Skip keys that start with BUILD_ENV
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if [[ "$key" == BUILD_ENV* ]]; then
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echo "Skipping key starting with BUILD_ENV: $key"
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continue
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fi
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build_args_map["$key"]="$value"
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done < "$file"
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else
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echo "⚠️ Skipping missing file: $file"
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fi
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done
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for key in "${!build_args_map[@]}"; do
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BUILD_ARGS+=" --build-arg $key=${build_args_map[$key]}"
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done
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# sets default docker file
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BUILD_ENV_DOCKER_FILE="${BUILD_ENV_DOCKER_FILE:-Dockerfile}"
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echo "Build env: $BUILD_ENV"
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echo "Build DockerFile: $BUILD_ENV_DOCKER_FILE"
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echo "Build Tag: $BUILD_ENV_IMAGE_TAG"
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echo "Running: podman build -f $BUILD_ENV_DOCKER_FILE $BUILD_ARGS -t $BUILD_ENV_IMAGE_TAG ."
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podman build -f $BUILD_ENV_DOCKER_FILE $BUILD_ARGS -t $BUILD_ENV_IMAGE_TAG .
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