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authorLuke Shumaker <lukeshu@lukeshu.com>2017-08-20 16:54:15 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-08-20 16:54:15 -0400
commitdbd9fa35e5dd40d33d8be9c899f3d56918aba34f (patch)
tree8c6f5beaecdad99caa724516643e33c2070fedc9 /build-aux/write-ifchanged
parente4b0a9391be1d21ca15d9610b977f989ccee833a (diff)
parenteaf336a9265399520e3cf71d4979446b98bdf48d (diff)
Merge remote-tracking branch 'r-autothing/v3/master'
Diffstat (limited to 'build-aux/write-ifchanged')
-rwxr-xr-xbuild-aux/write-ifchanged25
1 files changed, 25 insertions, 0 deletions
diff --git a/build-aux/write-ifchanged b/build-aux/write-ifchanged
new file mode 100755
index 0000000..84dfd6e
--- /dev/null
+++ b/build-aux/write-ifchanged
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Copyright (C) 2015 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##*/}.tmp"
+
+cat > "$tmpfile" || exit $?
+if cmp -s "$tmpfile" "$outfile"; then
+ rm -f "$tmpfile" || :
+else
+ mv -f "$tmpfile" "$outfile"
+fi