index.atom, also: write-atomic

1 files changed, 21 insertions, 0 deletions

diff --git a/write-atomic b/write-atomic
new file mode 100755
index 0000000..efb2551
--- /dev/null
+++ b/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"