From ba1feecd02229474125f82b582b69383b4d45806 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 4 Jun 2018 13:00:08 +0200
Subject: [mount-store] Conditionally enable nfs server

---
 scripts/mount-store | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/scripts/mount-store b/scripts/mount-store
index cc6766d..ff628a9 100755
--- a/scripts/mount-store
+++ b/scripts/mount-store
@@ -71,8 +71,11 @@ systemctl stop dnbd3-server.service
 
 # Already mounted?
 TRIES=0
+NFS_WAS_RUNNING=false
+systemctl is-active -q nfs-kernel-server.service && NFS_WAS_RUNNING=true
 while awk '{print $2}' "/proc/mounts" | grep -Fxq "${DEST}"; do
 	echo "Trying to unmount '$DEST'..."
+	systemctl stop nfs-kernel-server.service
 	if [ "$TRIES" -gt 5 ]; then
 		cat >&2 <<-HEREDOC
 			Error: Cannot unmount '$DEST'!
@@ -114,11 +117,35 @@ fi
 # Unmount and not requested to mount (local mode)
 if [[ "${SOURCE}" == "null" ]]; then
 	rm -f -- "${FLAG}"
-	echo "Success. Now using internal storage."
 	systemctl --no-block start dnbd3-server.service
+	# Enable nfs server
+	systemctl enable nfs-kernel-server.service
+	# Enable our export
+	sed -r -i 's,^\s*#\s*(/srv/openslx/nfs),\1,' "/etc/exports"
+	# Line was not present? add!
+	grep -Eq '^\s*/srv/openslx/nfs' "/etc/exports" \
+		|| echo '/srv/openslx/nfs   *(ro,async,insecure,no_root_squash,no_subtree_check)' >> "/etc/exports"
+	# Restart
+	systemctl --no-block restart nfs-kernel-server.service
+	echo "Success. Now using internal storage."
 	exit 0
 fi
 
+# Using external storage, via NFS or CIFS
+
+# Disable our export
+sed -r -i 's,^\s*(/srv/openslx/nfs),#\1,' "/etc/exports"
+# See if there are any foreign exports and nfs-server was running and if so, keep nfs server running
+if grep -Eq '^\s*/' /etc/exports; then
+	if "$NFS_WAS_RUNNING"; then
+		systemctl --no-block restart nfs-kernel-server.service
+	fi
+else
+	# No valid exports left, disable and stop NFS server
+	systemctl disable nfs-kernel-server.service
+	systemctl --no-block stop nfs-kernel-server.service
+fi
+
 touch "${FLAG}"
 
 if [[ "${SOURCE}" == "unknown" ]]; then
-- 
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