status-react/scripts/gen-deps-hash.sh

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#!/usr/bin/env bash
################################################################################
# This tool fetches versions of build tools from the .TOOLVERSIONS
# file in project root and calculates a single hash that represents
# the combined versions of all the specified tools.
################################################################################
GIT_ROOT=$(git rev-parse --show-toplevel)
toolversion="${GIT_ROOT}/scripts/toolversion"
usage () {
echo "Usage: gen-deps-hash [-b <base_hash>] -d <dep-name-1> [-d <dep-name-n>]" >&2
echo
echo "This script calculates a hash representing the required versions of the specified tools"
exit 0
}
# some options parsing
deps=()
while getopts "hb:d:" opt; do
case $opt in
b) base_hash="$OPTARG";;
d)
version=$($toolversion "$OPTARG")
if [ $? -ne 0 ]; then
echo "ERROR: $OPTARG not found in .TOOLVERSIONS"
exit 1
fi
deps+=("$OPTARG $version")
;;
h) usage;;
\?) echo "Invalid option: -$OPTARG" >&2; exit 1;;
esac
done
if [ ${#deps[@]} -eq 0 ]; then
echo "ERROR: No dependencies specified"
echo
usage
fi
IFS=$'\n' sorted_deps=($(sort <<<"${deps[*]}"))
unset IFS
hash=$(echo "${base_hash}${sorted_deps[@]}" | md5sum | cut -f1 -d" ")
echo "${hash:0:8}"