treewide: improve template expansion

also: support *.toml as extra configuration dictionaries

scripts/envsubst-dirs

@@ -0,0 +1,31 @@
+#!/bin/sh
+set -ef
+
+__template_list=$(mktemp)
+
+find "$@" -follow -name '*.in' -type f -printf '%p\0' \
+| sort -zuV > "${__template_list}"
+
+[ -s "${__template_list}" ] || {
+	rm -f "${__template_list}"
+	exit
+}
+
+__have_args="${ENVSUBST_ARGS:+1}"
+if [ -z "${__have_args}" ] ; then
+	## optimize envsubst-single invocation by caching argument list
+	## ref: envsubst-single
+	ENVSUBST_ARGS=$(mktemp)
+	envsubst-args.sh > "${ENVSUBST_ARGS}"
+	export ENVSUBST_ARGS
+fi
+
+set +e ; __ret=0
+xargs -0r -n 1000 -a "${__template_list}" \
+envsubst-multi < /dev/null || __ret=1
+
+[ -n "${__have_args}" ] || rm -f "${ENVSUBST_ARGS}"
+
+rm -f "${__template_list}"
+
+exit ${__ret}

scripts/envsubst-multi

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -ef
+
+__have_args="${ENVSUBST_ARGS:+1}"
+if [ -z "${__have_args}" ] ; then
+	## optimize envsubst-single invocation by caching argument list
+	## ref: envsubst-single
+	ENVSUBST_ARGS=$(mktemp)
+	envsubst-args.sh > "${ENVSUBST_ARGS}"
+	export ENVSUBST_ARGS
+fi
+
+set +e ; __ret=0
+for i ; do
+	envsubst-single "$i" || __ret=1
+done
+
+[ -n "${__have_args}" ] || rm -f "${ENVSUBST_ARGS}"
+
+exit ${__ret}

scripts/envsubst-single

@@ -0,0 +1,58 @@
+#!/bin/sh
+set -f
+
+src='-' dst='-'
+case $# in
+0 ) ;;
+1 )
+	src="$1"
+	case "$1" in
+	*.in ) dst="${1%".in"}" ;;
+	esac
+;;
+2 ) src="$1" ; dst="$2" ;;
+* ) exit 1 ;;
+esac
+[ -n "${src}" ] || exit 1
+[ -n "${dst}" ] || exit 1
+if [ "${src}" = '-' ] ; then src=/dev/stdin ; fi
+if [ "${dst}" = '-' ] ; then dst=/dev/stdout ; fi
+
+is_same_file() {
+	find -L "$1" -samefile "$2" -printf . -quit 2>/dev/null | grep -Fq . || return 1
+}
+
+if is_same_file "${src}" /dev/stdin ; then src=/dev/stdin ; fi
+if is_same_file "${dst}" /dev/stdout ; then dst=/dev/stdout ; fi
+
+while : ; do
+	if [ "${src}" = '/dev/stdin' ] && [ "${dst}" = '/dev/stdout' ] ; then
+		break
+	fi
+
+	if is_same_file "${src}" "${dst}" ; then
+		exit 1
+	fi
+break ; done
+
+set +e ; unset __ret
+while [ -n "${ENVSUBST_ARGS}" ] ; do
+	[ -f "${ENVSUBST_ARGS}" ] || break
+	[ -s "${ENVSUBST_ARGS}" ] || break
+
+	envsubst "$(cat "${ENVSUBST_ARGS}" </dev/null)" < "${src}" > "${dst}"
+	__ret=$?
+break ; done
+if [ -z "${__ret}" ] ; then
+	envsubst "$(envsubst-args.sh </dev/null)" < "${src}" > "${dst}"
+	__ret=$?
+fi
+
+while : ; do
+	[ "${ENVSUBST_UNLINK_SRC}" = 1 ] || break
+	[ "${src}" != '/dev/stdin' ] || break
+
+	rm -f "${src}"
+break ; done
+
+exit ${__ret}

scripts/envsubst.sh

@@ -1,12 +0,0 @@
-#!/bin/sh
-set -f
-
-while [ -n "${ENVSUBST_ARGS}" ] ; do
-	[ -f "${ENVSUBST_ARGS}" ] || break
-	[ -s "${ENVSUBST_ARGS}" ] || break
-
-	exec envsubst "$(cat "${ENVSUBST_ARGS}" </dev/null)" "$@"
-	exit 126
-done
-
-exec envsubst "$(envsubst-args.sh </dev/null)" "$@"

scripts/j2cfg-dirs

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -ef
+
+__template_list=$(mktemp)
+
+find "$@" -follow -name '*.j2' -type f -printf '%p\0' \
+| sort -zuV > "${__template_list}"
+
+[ -s "${__template_list}" ] || {
+	rm -f "${__template_list}"
+	exit
+}
+
+set +e ; __ret=0
+xargs -0r -n 1000 -a "${__template_list}" \
+j2cfg-multi < /dev/null || __ret=1
+
+rm -f "${__template_list}"
+
+exit ${__ret}