Download pre-built binaries from github releases with single command

download.sh

#!/bin/bash

# Ensure TMP_DIR is cleaned up on exit
cleanup() {
    rm -rf "$TMP_DIR"
}
trap cleanup EXIT

# Validate repo name function
validate_repo_name() {
    if [[ ! "$1" =~ ^[^/]+/[^/]+$ ]]; then
        echo "Invalid repo name. It should be in the format 'owner/repo'."
        exit 1
    fi
}

# Parse arguments
REPO=""
RELEASE_TAG="latest"
while [[ $# -gt 0 ]]; do
    case $1 in
        --repo)
            REPO="$2"
            shift 2
            ;;
        --tag)
            RELEASE_TAG="$2"
            shift 2
            ;;
        *)
            echo "Unknown argument: $1"
            exit 1
            ;;
    esac
done

# Validate repo name
if [[ -z "$REPO" ]]; then
    echo "Repo name is required. Use --repo <owner/repo>."
    exit 1
fi
validate_repo_name "$REPO"

# Set API URL
if [[ "$RELEASE_TAG" == "latest" ]]; then
    API_URL="https://api.github.com/repos/$REPO/releases/latest"
else
    API_URL="https://api.github.com/repos/$REPO/releases/tags/$RELEASE_TAG"
fi

OUTPUT_DIR="$(pwd)"
BINARY_NAME="$(basename "$REPO")"
TMP_DIR=$(mktemp -d -t sh-installer-0-1-0)

# Detect platform and architecture
PLATFORM="$(uname -s | tr '[:upper:]' '[:lower:]')"
ARCH="$(uname -m)"

case "$ARCH" in
    x86_64) ARCH="amd64" ;;
    armv7*) ARCH="armv7" ;;
    aarch64|arm64) ARCH="(aarch64|arm64)" ;;
    *) echo "Unsupported architecture: $ARCH"; exit 1 ;;
esac

case "$PLATFORM" in
    darwin) PLATFORM="(darwin|mac|macos)" ;;
    linux) PLATFORM="linux" ;;
    *) echo "Unsupported platform: $PLATFORM"; exit 1 ;;
esac

# Fetch release information
echo "Looking for $REPO ($RELEASE_TAG)"
RELEASE_INFO=$(curl -sSL -H "Accept: application/vnd.github.v3+json" "$API_URL")

if [[ $(echo "$RELEASE_INFO" | jq -r '.message') == "Not Found" ]]; then
    echo "Release not found for $REPO with tag $RELEASE_TAG."
    exit 1
fi

# Extract the asset download URL
echo "Searching for binary"
ASSET_URL=$(echo "$RELEASE_INFO" | grep -Eo '"browser_download_url": "[^"]+"' \
    | grep -iE "$PLATFORM" \
    | grep -iE "$ARCH" \
    | grep -E 'https://.+\.(tar\.bz|tar\.bz2|tar\.gz|tgz|gz|bz2|zip)\b[^.]' \
    | sed -E 's/.*"(https:[^"]+)".*/\1/' \
    | awk '{ print length, $0 }' | sort -n | cut -d" " -f2- | head -n 1)

if [[ -z "$ASSET_URL" ]]; then
    echo "No compatible binary found for platform: $PLATFORM, architecture: $ARCH"
    exit 1
fi

if [[ $(echo "$ASSET_URL" | wc -l) -ne 1 ]]; then
    echo "Multiple or no valid assets detected. Ensure only one matching asset exists."
    exit 1
fi

echo "Downloading $ASSET_URL"

# Extract file name from URL
FILE_NAME=$(basename "$ASSET_URL")

# Download the asset
curl --fail -# -L -o "$TMP_DIR/$FILE_NAME" "$ASSET_URL"

# Handle compressed files quietly
case "$FILE_NAME" in
    *.gz)
        gzip -d "$TMP_DIR/$FILE_NAME" &>/dev/null || { echo "Failed to extract $FILE_NAME"; exit 1; }
        ;;
    *.bz2)
        bzip2 -d "$TMP_DIR/$FILE_NAME" &>/dev/null || { echo "Failed to extract $FILE_NAME"; exit 1; }
        ;;
    *.tar.bz|*.tar.bz2)
        tar -jxf "$TMP_DIR/$FILE_NAME" -C "$TMP_DIR" &>/dev/null || { echo "Failed to extract $FILE_NAME"; exit 1; }
        ;;
    *.tar.gz|*.tgz)
        tar -zxf "$TMP_DIR/$FILE_NAME" -C "$TMP_DIR" &>/dev/null || { echo "Failed to extract $FILE_NAME"; exit 1; }
        ;;
    *.zip)
        unzip -o "$TMP_DIR/$FILE_NAME" -d "$TMP_DIR" &>/dev/null || { echo "Failed to unzip $FILE_NAME"; exit 1; }
        rm "$TMP_DIR/$FILE_NAME"
        ;;
    *)
        echo "Unknown file type for $FILE_NAME, assuming binary."
        ;;
esac

# Find the largest file and treat it as the binary
DOWNLOADED_BINARY=$(find "$TMP_DIR" -type f | xargs du | sort -n | tail -n 1 | cut -f 2)
if [[ -n "$DOWNLOADED_BINARY" ]]; then
    mv "$DOWNLOADED_BINARY" "$OUTPUT_DIR/$BINARY_NAME"
    chmod +x "$OUTPUT_DIR/$BINARY_NAME"
else
    echo "Failed to locate the downloaded binary."
    exit 1
fi

echo "Installation complete."
echo "Binary located at $OUTPUT_DIR/$BINARY_NAME"

Usage

Download latest release:

curl -SsfL https://dub.sh/downhub | bash -s -- --repo caddyserver/caddy

or with full url (more secure)

https://gist.githubusercontent.com/Marcisbee/8de62136966f778c9eea8de5e05eee92/raw/f7df544c16de13ff5425f508e159b5c34f456d01/download.sh

Download specific tag:

curl -SsfL https://dub.sh/downhub | bash -s -- --repo caddyserver/caddy --tag v2.9.1

Moved to github repo: https://github.com/Marcisbee/gh