Automatically download mongo-tools files from MongoDB website (only for Ubuntu)

README.md

Mongo-tools downloader

The problem

Let's assume I do not like to set and maintain MongoDB GPG keys and their repsitory lists in my Ubuntu host. I just need to download binaries and they should work.

The solution

This script only download a .tgz archive that contains requested binaries, to directory this script was run from.

Credits

OpenAI and their o3-mini neural network model.

Notes

Only for Ubuntu!

download-mongo-tools.sh

#!/bin/bash
set -e

# Fetch the latest version number from the MongoDB download page.
latest=$(curl -s "https://www.mongodb.com/try/download/database-tools" \
  | grep -oP 'mongodb-database-tools-ubuntu2204-x86_64-\K[0-9\.]+(?=\.tgz)' \
  | head -n1)
echo "Latest version: $latest"

# Determine the host Ubuntu codename.
host_codename=$(lsb_release -sc)
echo "Host codename: $host_codename"

# Map host codename to a supported LTS codename.
case "$host_codename" in
  noble|bionic|focal|jammy)
    lts_codename="$host_codename"
    ;;
  kinetic|lunar|mantic)
    lts_codename="jammy"  # nearest LTS for non-LTS 22.x releases
    ;;
  groovy)
    lts_codename="focal"  # for groovy (20.10), use focal (20.04 LTS)
    ;;
  *)
    lts_codename="jammy"
    ;;
esac
echo "Using LTS codename: $lts_codename"

# Map the chosen LTS codename to the version suffix used in the download URL.
case "$lts_codename" in
  noble)
    ubuntu_suffix="2404"
    ;;
  jammy)
    ubuntu_suffix="2204"
    ;;
  focal)
    ubuntu_suffix="2004"
    ;;
  bionic)
    ubuntu_suffix="1804"
    ;;
  *)
    ubuntu_suffix="2204"
    ;;
esac
echo "Ubuntu download suffix: $ubuntu_suffix"

# Determine the host architecture.
arch=$(uname -m)
echo "Detected architecture: $arch"
case "$arch" in
  x86_64)
    arch_str="x86_64"
    ;;
  aarch64)
    arch_str="arm64"
    ;;
  *)
    echo "Unknown architecture; defaulting to x86_64"
    arch_str="x86_64"
    ;;
esac
echo "Architecture string for URL: $arch_str"

# Build the download URL dynamically.
filename="mongodb-database-tools-ubuntu${ubuntu_suffix}-${arch_str}-${latest}.tgz"
URL="https://fastdl.mongodb.org/tools/db/${filename}"
echo "Download URL: $URL"

# Check if the file already exists; if so, skip the download.
if [ -f "$filename" ]; then
  echo "File '$filename' already exists. Skipping download."
else
  echo "Downloading $filename ..."
  wget "$URL"
fi