From 36b6fe1f3b6e0341c8514a65dc8d61faa9582117 Mon Sep 17 00:00:00 2001
From: Xavier Petit <32063953+xpetit@users.noreply.github.com>
Date: Mon, 3 Feb 2020 17:25:24 +0000
Subject: [PATCH] Add docker relocation service

---
 scripts/install_client.sh                              |  3 +++
 scripts/system/etc/systemd/system/mount-docker.service | 10 ++++++++++
 scripts/system/usr/local/bin/mount-docker.sh           | 10 ++++++++++
 3 files changed, 23 insertions(+)
 create mode 100644 scripts/system/etc/systemd/system/mount-docker.service
 create mode 100755 scripts/system/usr/local/bin/mount-docker.sh

diff --git a/scripts/install_client.sh b/scripts/install_client.sh
index d5567bf8a..1b6fd4572 100755
--- a/scripts/install_client.sh
+++ b/scripts/install_client.sh
@@ -116,6 +116,9 @@ if ! test -v PERSISTENT; then
 	# Disable user password
 	passwd -d student
 
+	# Enable docker relocation
+	systemctl enable mount-docker
+
 	# Remove tty
 	cat <<-EOF>> /etc/systemd/logind.conf
 	NAutoVTs=0
diff --git a/scripts/system/etc/systemd/system/mount-docker.service b/scripts/system/etc/systemd/system/mount-docker.service
new file mode 100644
index 000000000..0ad039aff
--- /dev/null
+++ b/scripts/system/etc/systemd/system/mount-docker.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Docker relocation
+Before=docker.service
+
+[Service]
+ExecStart=/usr/local/bin/mount-docker.sh
+Type=oneshot
+
+[Install]
+RequiredBy=docker.service
diff --git a/scripts/system/usr/local/bin/mount-docker.sh b/scripts/system/usr/local/bin/mount-docker.sh
new file mode 100755
index 000000000..52fdeea78
--- /dev/null
+++ b/scripts/system/usr/local/bin/mount-docker.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+cp -a /var/lib/docker /tmp
+mount -t tmpfs -osize=2G tmpfs /var/lib/docker
+mv /tmp/docker/* /var/lib/docker