92 lines
2.5 KiB
Bash
92 lines
2.5 KiB
Bash
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#!/usr/bin/env bash
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set -e
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readonly MIN_BASH_VERSION=5
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readonly MIN_DOCKER_VERSION=25
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readonly MIN_JQ_VERSION=1.6
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readonly MIN_GPG_VERSION=2.2
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### Exit with error message
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die() {
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echo "$@" >&2
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exit 1
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}
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### Bail and instruct user on missing package to install for their platform
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die_pkg() {
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local -r package=${1?}
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local -r version=${2?}
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local install_cmd
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case "$OSTYPE" in
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linux*)
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if command -v "apt" >/dev/null; then
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install_cmd="apt install ${package}"
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elif command -v "yum" >/dev/null; then
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install_cmd="yum install ${package}"
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elif command -v "pacman" >/dev/null; then
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install_cmd="pacman -Ss ${package}"
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elif command -v "emerge" >/dev/null; then
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install_cmd="emerge ${package}"
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elif command -v "nix-env" >/dev/null; then
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install_cmd="nix-env -i ${package}"
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fi
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;;
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bsd*) install_cmd="pkg install ${package}" ;;
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darwin*) install_cmd="port install ${package}" ;;
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*) die "Error: Your operating system is not supported" ;;
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esac
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echo "Error: ${package} ${version}+ does not appear to be installed." >&2
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[ -n "$install_cmd" ] && echo "Try: \`${install_cmd}\`" >&2
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exit 1
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}
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### Check if actual binary version is >= minimum version
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check_version(){
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local pkg="${1?}"
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local have="${2?}"
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local need="${3?}"
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local i ver1 ver2 IFS='.'
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[[ "$have" == "$need" ]] && return 0
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read -r -a ver1 <<< "$have"
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read -r -a ver2 <<< "$need"
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for ((i=${#ver1[@]}; i<${#ver2[@]}; i++));
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do ver1[i]=0;
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done
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for ((i=0; i<${#ver1[@]}; i++)); do
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[[ -z ${ver2[i]} ]] && ver2[i]=0
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((10#${ver1[i]} > 10#${ver2[i]})) && return 0
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((10#${ver1[i]} < 10#${ver2[i]})) && die_pkg "${pkg}" "${need}"
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done
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}
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### Check if required binaries are installed at appropriate versions
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check_tools(){
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if [ -z "${BASH_VERSINFO[0]}" ] \
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|| [ "${BASH_VERSINFO[0]}" -lt "${MIN_BASH_VERSION}" ]; then
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die_pkg "bash" "${MIN_BASH_VERSION}"
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fi
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for cmd in "$@"; do
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command -v "$1" >/dev/null || die "Error: $cmd not found"
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case $cmd in
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jq)
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version=$(jq -V | sed 's/.*-//g')
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check_version "jq" "${version}" "${MIN_JQ_VERSION}"
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;;
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gpg)
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version=$(gpg --version | head -n1 | cut -d" " -f3)
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check_version "gnupg" "${version}" "${MIN_GPG_VERSION}"
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;;
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docker)
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version=$(docker version -f json | jq -r '.Server.Version')
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check_version "docker" "${version}" "${MIN_DOCKER_VERSION}"
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;;
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esac
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done
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}
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check_tools jq gpg docker;
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docker info -f '{{ .DriverStatus }}' \
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| grep "io.containerd.snapshotter.v1" >/dev/null \
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|| die "Error: Docker Engine is not using containerd for image storage"
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