File 0109-nvme-cli-Add-script-to-determine-host-NQN.patch of Package nvme-cli.12152

From b38de666b0ae385bb35c00280c48a20f4d4d6aae Mon Sep 17 00:00:00 2001
From: Simon Schricker <sschricker@suse.de>
Date: Fri, 17 May 2019 15:36:37 +0200
Subject: [PATCH] nvme-cli: Add script to determine host NQN

* Based on the system-UUID, via dmidecode
* verifies UUID format
* tries to catch fake/lazy UUIDs
---
 scripts/det-hostnqn.sh | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 scripts/det-hostnqn.sh

diff --git a/scripts/det-hostnqn.sh b/scripts/det-hostnqn.sh
new file mode 100644
index 0000000..d8783cf
--- /dev/null
+++ b/scripts/det-hostnqn.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+LC_ALL=C
+
+UUID=$(dmidecode -s system-uuid | tr -d '[:space:]')
+
+if [ -z "$UUID" ] ; then
+	>&2 echo "No UUID found, can't determine hostnqn."
+	exit 1
+fi
+
+# convert UUID to lower-case only:
+UUID=$(echo $UUID | tr '[:upper:]' '[:lower:]')
+
+# check UUID format, e.g.: 4c4c4544-0156-4a10-8134-b7d04f383232, so: 8-4-4-4-12
+if ! [[ $UUID =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]] ; then
+	>&2 echo "UUID has invalid format."
+	>&2 echo "Invalid UUID: ${UUID}"
+	exit 2
+fi
+
+# HEURISTIC:
+# (1) if any one given character occurs more than 50% of the time, it is likely
+# that the UUID is fake.
+# (2) if the first or the last group consists of mostly the same character, it
+# is likely that the UUID is fake.
+FIRST_GROUP="$(echo $UUID | cut -d'-' -f1)"
+LAST_GROUP="$(echo $UUID | cut -d'-' -f5)"
+for i in {{0..9},{a..f}} ; do
+	COUNT_TOTAL="${UUID//[^$i]}"
+	COUNT_FIRST="${FIRST_GROUP//[^$i]}"
+	COUNT_LAST="${LAST_GROUP//[^$i]}"
+	if [ ${#COUNT_TOTAL} -ge 16 ] || [ ${#COUNT_FIRST} -ge 7 ] || [ ${#COUNT_LAST} -ge 11 ] ; then
+		>&2 echo "UUID is too repetitive. This may be a false alert."
+		>&2 echo "Repetitive UUID: ${UUID}"
+		exit 3
+	fi
+done
+
+HOSTNQN="nqn.2014-08.org.nvmexpress:uuid:${UUID}"
+
+echo $HOSTNQN
-- 
2.16.4
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