Add NFS, but it's not *quite* finished yet

we still need to auto-generate the cluster-shared-nfs script and perhaps 
rename it

src/run.sh

@@ -40,6 +40,7 @@ fi
 version="$(git rev-parse HEAD)";
 last_version="";
 if [[ -r "/etc/sbrl-provisioning-commitid.txt" ]]; then
+	#shellcheck disable=SC2034
 	last_version="$(cat "/etc/sbrl-provisioning-commitid.txt")";
 fi
 

src/steps-config/15-nfs.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+queue_apt_install "nfs-common";

src/steps-postinstall/20-collectd.sh

@@ -10,6 +10,7 @@ subtask_end "$?";
 
 # If there's an existing config file and we haven't completed provisioning at
 # least once yet, move it aside as a backup
+#shellcheck disable=SC2154
 if [[ -r "/etc/collectd/collectd.conf" ]] && [[ -z "${last_version}" ]]; then
 	subtask_begin "Moving existing config file aside";
 	mv "${collectd_conf_target}" "${collectd_conf_target}.bak-$(date +%Y-%m-%d)";

src/steps-postinstall/20-nfs.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# $1	Thing to mount
+# $2	Path to mount it to
+add_nfs_mount() {
+	source="${1}";
+	target="${2}";
+	
+	task_begin "NFS mount ${source} → ${target}";
+	# 1: Remove any old entries from /etc/fstab
+	sed -i "/^$(echo "${source}" | awk '{gsub("/", "\\/", $0); print($0); }')\s/d" /etc/fstab
+	
+	# 2: Append the new entry
+	echo "${source}	${target}	nfs	auto,nofail,noatime,_netdev,tcp,bg,timeo=50,retrans=5	0	0" >>/etc/fstab;
+	
+	# 3: Create the target mount point & mount
+	mkdir -p "${target}";
+	mount "${target}";
+	
+	task_end "$?";
+}
+
+add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/cluster" "/mnt/shared";
+add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/main	/mnt/elfstone" "/mnt/elfstone";
+add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/syncthing" "/mnt/elessar-syncthing";