From b6507f91374d83ad1988f77eb9097f645a80ec71 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 10 Dec 2019 15:00:26 +0100
Subject: [scripts/mount-store] Semi-support custom local mounts in "internal"
 mode

---
 scripts/mount-store | 71 ++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 48 insertions(+), 23 deletions(-)

diff --git a/scripts/mount-store b/scripts/mount-store
index ff628a9..b19ec83 100755
--- a/scripts/mount-store
+++ b/scripts/mount-store
@@ -67,6 +67,50 @@ storage_test () {
 	return $RET
 }
 
+enable_nfs_export () {
+	# 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
+}
+
+disable_nfs_export () {
+	# 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 "$NFS_WAS_RUNNING"; then
+			systemctl --no-block restart nfs-kernel-server.service
+		fi
+	else
+		# No valid exports left, disable and stop NFS server
+		systemctl disable nfs-kernel-server.service
+		systemctl --no-block stop nfs-kernel-server.service
+	fi
+}
+
+# Quick safty measure -- if any local FS is mounted, do nothing and print warning if different type is requested
+CURRENT_TYPE="$( awk -v DEST="$DEST" '$2 == DEST {print $3}' /proc/mounts )"
+if [ -n "$CURRENT_TYPE" ] && ! [[ "$CURRENT_TYPE" == nfs* || "$CURRENT_TYPE" == cifs* ]]; then
+	# Currently mounted, but neither CIFS or NFS...
+	if [ "$SOURCE" = "null" ]; then
+		echo "Internal storage requested, something of type $CURRENT_TYPE already mounted, doing nothing."
+		rm -f -- "$FLAG"
+		enable_nfs_export
+		systemctl --no-block restart dnbd3-server.service
+		exit 0
+	fi
+	echo "There's something of type $CURRENT_TYPE mounted at $DEST, but the satellite server's configuration"
+	echo "requests $SOURCE to be used as the VM store. If you modified your fstab or added a .mount service"
+	echo "to use a custom storage backend, please set the VM storage type in slx-admin to INTERNAL."
+	exit 1
+fi
+
 systemctl stop dnbd3-server.service
 
 # Already mounted?
@@ -118,33 +162,14 @@ fi
 if [[ "${SOURCE}" == "null" ]]; then
 	rm -f -- "${FLAG}"
 	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
+	enable_nfs_export
 	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
+disable_nfs_export
 
 touch "${FLAG}"
 
@@ -185,7 +210,7 @@ remove_option () {
 
 main () {
 	local RET=999
-	if grep -E -q '^[^/].+:.+' <<<$SOURCE; then
+	if [[ "$SOURCE" =~ ^[^/].+:. ]]; then
 		# seems to be NFS
 		if [ "$RET" != 0 ] && [ -n "$MOUNT_OPTIONS" ]; then
 			remove_option bg retry ro
@@ -214,7 +239,7 @@ main () {
 				echo "$OPTSTR" > "$NFS_OPTS"
 			fi
 		fi
-	elif grep -E -q '^//' <<<$SOURCE; then
+	elif [[ "$SOURCE" =~ ^//.+/. ]]; then
 		# seems to be SMB
 		export USER="$USERNAME"
 		export PASSWD="$PASSWORD"
-- 
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