[CIT-663] Add hints for upgrade of thin-edge.io (#557)

* Add note in installation doc about upgradingg
* Add prerm scripts with hints to stop running mappers
Signed-off-by: Lukasz Woznicki <lukasz.woznicki@softwareag.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/configuration/debian/tedge_agent/prerm b/configuration/debian/tedge_agent/prerm
new file mode 100644
index 00000000..ef5833cd
--- /dev/null
+++ b/configuration/debian/tedge_agent/prerm
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+print_hint() {
+    echo "$1 is running. Stop $1 before installation, to stop it use: systemctl stop $1"
+}
+
+if systemctl is-active --quiet tedge-agent; then
+    print_hint "tedge-agent"
+    exit 1
+fi
diff --git a/configuration/debian/tedge_mapper/prerm b/configuration/debian/tedge_mapper/prerm
new file mode 100644
index 00000000..4b7a037b
--- /dev/null
+++ b/configuration/debian/tedge_mapper/prerm
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+set -e
+
+print_hint() {
+    echo "$1 is running. Stop $1 before installation, use: systemctl stop $1"
+    echo "If you want to start $1 after installation, use: systemctl restart $1"
+    echo "Make sure that other mappers are not running: systemctl is-active [mapper_name]"
+    echo "Known mappers are: tedge-mapper-c8y, tedge-mapper-collectd, tedge-mapper-sm-c8y, tedge-mapper-az".
+}
+
+if systemctl is-active --quiet tedge-mapper-c8y; then
+    print_hint "tedge-mapper-c8y"
+    exit 1
+fi
+
+if systemctl is-active --quiet tedge-mapper-sm-c8y; then
+    print_hint "tedge-mapper-sm-c8y"
+    exit 1
+fi
+
+if systemctl is-active --quiet tedge-mapper-collectd; then
+    print_hint "tedge-mapper-collectd"
+    exit 1
+fi
+
+if systemctl is-active --quiet tedge-mapper-az; then
+    print_hint "tedge-mapper-az"
+    exit 1
+fi