termux-packages/scripts/updates/utils/termux_pkg_is_update_needed.sh

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#!/bin/bash
#
# NOTE: This function returns true even when CURRENT_VERSION = "1.0" and LATEST_VERSION = "1.0-1".
# This is logically correct, but repology sometimes returns "1.0-1" as the latest version even
# if "1.0" is latest. This happens when any of the repositories tracked by repology has specified
# "1.0-1" as the latest.
#
# For example:
# latest lua:lpeg version (as of 2021-11-20T12:21:31) is "1.0.2" but MacPorts specifies as "1.0.2-1".
# Hence repology returns "1.0.2-1" as the latest.
#
# But hopefully, all this can be avoided if TERMUX_PKG_UPDATE_VERSION_REGEXP is set.
#
termux_pkg_is_update_needed() {
# USAGE: termux_pkg_is_update_needed <current-version> <latest-version> [regexp]
if [[ -z "$1" ]] || [[ -z "$2" ]]; then
termux_error_exit "${BASH_SOURCE[0]}: at least 2 arguments expected"
fi
local CURRENT_VERSION="$1"
local LATEST_VERSION="$2"
# Compare versions.
# shellcheck disable=SC2091
if $(
cat <<-EOF | python3 -
import sys
from pkg_resources import parse_version
if parse_version("${CURRENT_VERSION}") < parse_version("${LATEST_VERSION}"):
sys.exit(0)
else:
sys.exit(1)
EOF
); then
return 0 # true. Update needed.
fi
return 1 # false. Update not needed.
}
show_help() {
echo "Usage: ${BASH_SOURCE[0]} [--help] <first-version> <second-version>] [version-regex]"
echo "--help - show this help message and exit"
echo " <first-version> - first version to compare"
echo " <second-version> - second version to compare"
echo " [version-regex] - optional regular expression to filter version numbers"
exit 0
}
# Make script sourceable as well as executable.
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
declare -f termux_error_exit >/dev/null ||
. "$(dirname "$(realpath "${BASH_SOURCE[0]}")")/termux_error_exit.sh" # realpath is used to resolve symlinks.
if [[ "${1}" == "--help" ]]; then
show_help
fi
# Print in human readable format.
first_version="$1"
second_version="$2"
version_regexp="${3:-}"
if [[ -n "${version_regexp}" ]]; then
first_version="$(grep -oP "${version_regexp}" <<<"${first_version}")"
second_version="$(grep -oP "${version_regexp}" <<<"${second_version}")"
if [[ -z "${first_version}" ]] || [[ -z "${second_version}" ]]; then
termux_error_exit "ERROR: Unable to parse version numbers using regexp '${version_regexp}'"
fi
fi
if termux_pkg_is_update_needed "${first_version}" "${second_version}" "${version_regexp}"; then
echo "${first_version} < ${second_version}"
else
echo "${first_version} >= ${second_version}"
fi
fi