From 7af3811df0e4d8707d8218361dd305f42df62be2 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Wed, 7 Sep 2016 01:20:54 -0400
Subject: (systemd) build-aux: add var and write-atomic modules

---
 build-aux/Makefile.each.tail/00-var.mk          | 22 ++++++++++++++++++++++
 build-aux/Makefile.once.head/00-var.mk          | 18 ++++++++++++++++++
 build-aux/Makefile.once.head/10-write-atomic.mk |  4 ++++
 build-aux/write-atomic                          | 21 +++++++++++++++++++++
 4 files changed, 65 insertions(+)
 create mode 100644 build-aux/Makefile.each.tail/00-var.mk
 create mode 100644 build-aux/Makefile.once.head/00-var.mk
 create mode 100644 build-aux/Makefile.once.head/10-write-atomic.mk
 create mode 100755 build-aux/write-atomic

diff --git a/build-aux/Makefile.each.tail/00-var.mk b/build-aux/Makefile.each.tail/00-var.mk
new file mode 100644
index 0000000..c2fd9d7
--- /dev/null
+++ b/build-aux/Makefile.each.tail/00-var.mk
@@ -0,0 +1,22 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+mod.var.depends += quote write-ifchanged
+
+$(outdir)/.var.%: _var.FORCE
+	@printf '%s' $(call quote.shell,$($*)) | sed 's/^/#/' | $(WRITE_IFCHANGED) $@
+-include $(wildcard $(outdir)/.var.*)
+
+at.targets += $(addprefix $(outdir)/,.var.%)
diff --git a/build-aux/Makefile.once.head/00-var.mk b/build-aux/Makefile.once.head/00-var.mk
new file mode 100644
index 0000000..d1e537e
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-var.mk
@@ -0,0 +1,18 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+mod.var.description = Depend on the values of variables
+
+.PHONY: _var.FORCE
diff --git a/build-aux/Makefile.once.head/10-write-atomic.mk b/build-aux/Makefile.once.head/10-write-atomic.mk
new file mode 100644
index 0000000..f099ae2
--- /dev/null
+++ b/build-aux/Makefile.once.head/10-write-atomic.mk
@@ -0,0 +1,4 @@
+mod.write-atomic.description = `write-atomic` auxiliary build script
+mod.write-atomic.files += $(topsrcdir)/build-aux/write-atomic
+
+WRITE_ATOMIC ?= $(topsrcdir)/build-aux/write-atomic
diff --git a/build-aux/write-atomic b/build-aux/write-atomic
new file mode 100755
index 0000000..efb2551
--- /dev/null
+++ b/build-aux/write-atomic
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+outfile=$1
+tmpfile="$(dirname "$outfile")/.tmp${outfile##*/}"
+
+cat > "$tmpfile" || { r=$?; rm -f "$tmpfile"; exit $r; }
+mv -f "$tmpfile" "$outfile"
-- 
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