From fff43fa3973f97578b4a217ecbb1b737bbe50aab Mon Sep 17 00:00:00 2001
From: Valentin Lab <valentin.lab@kalysto.org>
Date: Thu, 26 Jul 2018 14:56:40 +0200
Subject: [PATCH] fix: [docker-host] restart docker only if necessary

---
 precise/host/hooks/install.d/60-docker.sh | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/precise/host/hooks/install.d/60-docker.sh b/precise/host/hooks/install.d/60-docker.sh
index 9911b09c..e47419d5 100755
--- a/precise/host/hooks/install.d/60-docker.sh
+++ b/precise/host/hooks/install.d/60-docker.sh
@@ -1,17 +1,26 @@
 #!/bin/bash
 
-
+need_restart=
 if ! type -p docker; then
     echo "Installing docker..."
     curl -sSL https://get.docker.io | sh
 fi
 
-version="$(apt-cache madison docker-ce | cut -f 2 -d \| | grep 17.06 | head -n 1 | xargs echo)"
-## DOWNGRADE to 17.xx because 18.xx do not support registry v1
-apt-get install -y --force-yes docker-ce="$version"
+docker_version=17.06
+if ! [[ "$(docker --version)" == "Docker version $docker_version"* ]]; then
+    version="$(apt-cache madison docker-ce | cut -f 2 -d \| | grep "$docker_version" | head -n 1 | xargs echo)"
+    ## DOWNGRADE to 17.xx because 18.xx do not support registry v1
+    apt-get install -y --force-yes docker-ce="$version"
+    need_restart=true
+fi
+
 
 if ! egrep 'disable-legacy-registry' /lib/systemd/system/docker.service 2>/dev/null; then
     sed -ri 's/^(ExecStart=.*)$/\1 --disable-legacy-registry=false/g' /lib/systemd/system/docker.service
+    need_restart=true
 fi
-systemctl daemon-reload &&
-service docker restart
+
+if [ "$need_restart" ]; then
+    systemctl daemon-reload &&
+        service docker restart
+fi
\ No newline at end of file