From d05f91b56d1a78d2ab40d685e945cb89554646ec Mon Sep 17 00:00:00 2001
From: Tordarus <tordarus@protonmail.com>
Date: Fri, 6 Jun 2025 14:08:21 +0200
Subject: [PATCH] initial commit

---
 Dockerfile    | 20 ++++++++++++++++++++
 README.md     | 39 +++++++++++++++++++++++++++++++++++++++
 entrypoint.sh | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 109 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 README.md
 create mode 100644 entrypoint.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..b485515
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM golang:alpine
+
+# Install required tools
+RUN apk add --no-cache git ca-certificates bash
+
+# Set working directory
+WORKDIR /app
+
+# Copy entrypoint script
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Default environment values (can be overridden at runtime)
+ENV GIT_REPO=""
+ENV APP_PATH="."
+ENV GIT_USERNAME=""
+ENV GIT_TOKEN=""
+ENV PACKAGES=""
+
+ENTRYPOINT ["/entrypoint.sh"]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fa89124
--- /dev/null
+++ b/README.md
@@ -0,0 +1,39 @@
+# 🐳 Go Builder & Runner Docker Image
+
+This Docker image is designed to **download**, **compile**, and **run** a Go program from a Git repository entirely at **container runtime**. It supports both public and private repositories and works seamlessly across multiple architectures (`amd64`, `arm64`).
+
+---
+
+## ✅ Features
+
+- ✅ Clones a Go repository at runtime
+- ✅ Supports **private Git repositories** using `.netrc`-based auth
+- ✅ Builds and runs your Go application
+- ✅ Multi-architecture: `linux/amd64`, `linux/arm64`
+- ✅ Minimal and reproducible container setup
+
+---
+
+## 🧪 Example Usage
+
+```bash
+docker run --rm \
+  -e GIT_REPO=https://github.com/youruser/your-go-app.git \
+  -e GIT_USERNAME=yourusername \
+  -e GIT_TOKEN=yourtoken \
+  gorunner:latest
+```
+
+## 🔧 Environment Variables
+
+| Variable               | Required | Description                                                             |
+| ---------------------- | -------- | ----------------------------------------------------------------------- |
+| `GIT_REPO`             | ✅ Yes   | The HTTPS Git URL of your Go project                                    |
+| `GIT_USERNAME`         | Optional | Your Git username (required for private repos)                          |
+| `GIT_TOKEN`            | Optional | A personal access token or password (required for private repos)        |
+| `APP_PATH`             | Optional | Relative path to the Go module directory inside the repo (default: `.`) |
+| `PACKAGES`             | Optional | Comma-separated list of packages to install with `apk` before execution |
+
+## 📄 License
+
+MIT License – feel free to modify and use.
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..690fd06
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+
+error() {
+  echo "[ERROR] $1" >&2
+  exit 1
+}
+
+if [ -z "$GIT_REPO" ]; then
+  error "GIT_REPO is not set."
+fi
+
+# Install runtime packages if specified
+if [ -n "$PACKAGES" ]; then
+  echo "[PKG] Installing additional APK packages: $PACKAGES"
+  apk update >/dev/null
+  apk add --no-cache $(echo "$PACKAGES" | tr ',' ' ')
+fi
+
+# Extract Git host
+GIT_HOST=$(echo "$GIT_REPO" | awk -F/ '{print $3}')
+
+# Configure .netrc
+if [ -n "$GIT_USERNAME" ] && [ -n "$GIT_TOKEN" ]; then
+  echo "[AUTH] Configuring .netrc for Git authentication..."
+  cat <<EOF > ~/.netrc
+machine $GIT_HOST
+login $GIT_USERNAME
+password $GIT_TOKEN
+EOF
+  chmod 600 ~/.netrc
+
+  # Prevent Git from prompting and force it to use .netrc
+  export GIT_ASKPASS=true
+  export GIT_TERMINAL_PROMPT=0
+fi
+
+# Clean previous checkout
+rm -rf /app/repo
+
+echo "[CLONE] Cloning repository: $GIT_REPO"
+git clone "$GIT_REPO" repo
+
+cd repo/"${APP_PATH:-.}"
+
+echo "[BUILD] Building..."
+go build -o /app/app .
+
+echo "[RUN] Starting application..."
+exec /app/app