[Devel] Backup VE's network config file if it lacks of DON'T EDIT warning

[Igor Podlesny]

---
 etc/dists/scripts/debian-add_ip.sh |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/etc/dists/scripts/debian-add_ip.sh b/etc/dists/scripts/debian-add_ip.sh
index 0fb1f36..80e8e73 100755
--- a/etc/dists/scripts/debian-add_ip.sh
+++ b/etc/dists/scripts/debian-add_ip.sh
@@ -38,9 +38,18 @@ fix_networking_conf()
 
 setup_network()
 {
+	DONT_EDIT='WARNING: Do not edit this file'
+	[ -r "$CFGFILE" ] &&
+		head -n20 "$CFGFILE" | fgrep -q -- "$DONT_EDIT" || {
+			# -- It has no our warning inside, so we'd better
+			# back it up:
+			cp "$CFGFILE" \
+				"${CFGFILE}-$(date --rfc-3339=seconds).bak"
+		}
+
 	echo "# This configuration file is auto-generated.
 #
-# WARNING: Do not edit this file, your changes will be lost.
+# $DONT_EDIT, your changes will be lost.
 # Please create/edit $CFGFILE.head and
 # $CFGFILE.tail instead, their contents will be
 # inserted at the beginning and at the end of this file, respectively.
-- 
1.7.9.5