Bash script to update docker-compose to the latest release

update-docker-compose.sh

#!/bin/bash
#
# Updates docker-compose to the latest release
#
# Author: Emiliano Gabrielli <[email protected]>

DESTINATION_FILE="${DESTINATION_FILE:-$(command -v docker-compose)}"

set -e -o pipefail

if [ -x "$DESTINATION_FILE" ]; then
    current_version=$("${DESTINATION_FILE}" --version | sed 's/.*version\s\+\([^,]\+\).*/\1/')
    printf "Previously downloaded release found: '%s'...\n" "$current_version"
fi

LATEST_RELEASE=$(curl -Ls -w "%{url_effective}\n" -o /dev/null  https://github.com/docker/compose/releases/latest  | sed -n 's#^.*/tag/##p')
printf "Latest vendor release is '%s'...\n" "${LATEST_RELEASE}"

if [ "$current_version" = "$LATEST_RELEASE" ]; then
    printf "\nYou are already up to date. Nothing to do.\n\n"
    exit 0
fi

printf "Going to download...\n\n"

curl -Ls "https://github.com/docker/compose/releases/download/${LATEST_RELEASE}/docker-compose-$(uname -s)-$(uname -m)" -o "${DESTINATION_FILE}"
chmod +x "${DESTINATION_FILE}"

"${DESTINATION_FILE}" --version

# vim: ai ts=4 sw=4 et sts=4 ft=sh