Verify tarballs locally against a md5 checksum (if available) and check for tarball integrity with `tar`

tarball_verify.sh

#!/bin/bash

# Function to print usage
usage() {
    echo "Usage: $0 [-c <checksum file>] <tarball>"
    echo "  -c <checksum file> : Optional, specify the checksum file to verify the tarball against"
    exit 1
}

# Check if no arguments were provided
if [ $# -eq 0 ]; then
    usage
fi

# Parse options
CHECKSUM_FILE=""
while getopts ":c:" opt; do
    case ${opt} in
        c )
            CHECKSUM_FILE=$OPTARG
            ;;
        \? )
            echo "Invalid option: $OPTARG" 1>&2
            usage
            ;;
        : )
            echo "Invalid option: $OPTARG requires an argument" 1>&2
            usage
            ;;
    esac
done
shift $((OPTIND -1))

# Check if tarball is provided
TARBALL=$1
if [ -z "$TARBALL" ]; then
    usage
fi

# If no checksum file is provided, look for a matching .md5 file
if [ -z "$CHECKSUM_FILE" ]; then
    CHECKSUM_FILE="${TARBALL}.md5"
    if [ ! -f "$CHECKSUM_FILE" ]; then
        echo "No checksum file provided and no matching checksum file found: $CHECKSUM_FILE"
        CHECKSUM_FILE=""
    fi
fi

# Verify the tarball integrity
echo "Verifying the tarball integrity..."
tar -tvf "$TARBALL" > /dev/null
if [ $? -eq 0 ]; then
    echo "Tarball integrity check passed."
else
    echo "Tarball integrity check failed."
    exit 1
fi

# Verify checksum if found
if [ -n "$CHECKSUM_FILE" ]; then
    echo "Verifying the checksum..."
    if [ -f "$CHECKSUM_FILE" ]; then
        md5sum -c "$CHECKSUM_FILE"
        if [ $? -eq 0 ]; then
            echo "Checksum verification passed."
        else
            echo "Checksum verification failed."
            exit 1
        fi
    else
        echo "Checksum file not found: $CHECKSUM_FILE"
        exit 1
    fi
fi

echo "All checks passed successfully!"