Add nfsboot configuration extension

This configuration-extension removes every network interface but the
loopback interface from /etc/network/interfaces and stops /etc/fstab
from mounting "/".

It will only do this if the environment variable NFSBOOT_CONFIGURE is
set on the `morph deploy` command-line.

1 files changed, 32 insertions, 0 deletions

diff --git a/morphlib/exts/nfsboot.configure b/morphlib/exts/nfsboot.configure
new file mode 100755
index 00000000..8dc6c67c
--- /dev/null
+++ b/morphlib/exts/nfsboot.configure
@@ -0,0 +1,32 @@
+#!/bin/sh
+# Copyright (C) 2013  Codethink Limited
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+# Remove all networking interfaces and stop fstab from mounting '/'
+
+
+set -e
+if [ "$NFSBOOT_CONFIGURE" ]; then
+    # Remove all networking interfaces but loopback
+    cat > "$1/etc/network/interfaces" <<EOF
+auto lo
+iface lo inet loopback
+EOF
+
+    # Stop fstab from mounting '/'
+    mv "$1/etc/fstab" "$1/etc/fstab.old"
+    awk '/^ *#/ || $2 != "/"' "$1/etc/fstab.old" > "$1/etc/fstab"
+fi