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vars.sh
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/
vars.sh
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#!/usr/bin/env sh
set -eu
from=
var=
print_usage() {
echo 'Query Makefile variables from scripts. Use like so:'
echo
echo " $0 go_version"
echo " $0 FROM=docs python_version"
}
fail() {
echo "$@" >&2
print_usage >&2
exit 1
}
[ $# -gt 0 ] || { print_usage && exit; }
while [ $# -gt 0 ]; do
case "$1" in
*=*)
name="${1%%=*}" && val="${1#*=}"
[ "$name" = FROM ] || fail Unsupported variable "$name"
[ -z "$from" ] || fail FROM already given
[ -n "$val" ] || fail FROM may not be empty
from="$val"
;;
*)
[ -z "$var" ] || fail Makefile variable already given
var="$1"
;;
esac
shift 1
done
[ -n "$var" ] || fail Makefile variable not given
[ -n "$from" ] || from=embedded-bins
exec make --no-print-directory -r -s -f - <<EOF
include $from/Makefile.variables
.PHONY: print
print:
ifeq (\$(origin $var),file)
\$(info \$($var))
else
\$(error Makefile variable $var doesn't exist)
endif
EOF