From be857c174e7fe3a442b45514439beeb7e538a276 Mon Sep 17 00:00:00 2001
From: Stefan Kalscheuer <stefan@stklcode.de>
Date: Fri, 21 Jun 2024 17:06:00 +0200
Subject: [PATCH] 17237 FIX check_mk_agent.openwrt: resolve issue when hostname
 command unavailable

Built-in BusyBox shell in OpenWRT has no `hostname` command available per default.
While it can be added with additional packages in custom images there are alternative
ways to determine the machine's hostname without introducing an additional dependency.
This werk uses one of those alternatives.

Closes: #721

Change-Id: Ib05f837151f02942077a5b405dab966e7f4f9318
---
 .werks/17237.md               | 17 +++++++++++++++++
 agents/check_mk_agent.openwrt |  4 ++--
 2 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 .werks/17237.md

diff --git a/.werks/17237.md b/.werks/17237.md
new file mode 100644
index 00000000000..afbf75506cb
--- /dev/null
+++ b/.werks/17237.md
@@ -0,0 +1,17 @@
+[//]: # (werk v2)
+# check_mk_agent.openwrt: resolve issue when hostname command unavailable
+
+key        | value
+---------- | ---
+date       | 2024-11-08T07:14:01+00:00
+version    | 2.3.0p21
+class      | fix
+edition    | cre
+component  | checks
+level      | 1
+compatible | yes
+
+Built-in BusyBox shell in OpenWRT has no `hostname` command available per default.
+While it can be added with additional packages in custom images there are alternative
+ways to determine the machine's hostname without introducing an additional dependency.
+This werk uses one of those alternatives.
diff --git a/agents/check_mk_agent.openwrt b/agents/check_mk_agent.openwrt
index 05faf11dcee..96be8a0e33e 100755
--- a/agents/check_mk_agent.openwrt
+++ b/agents/check_mk_agent.openwrt
@@ -272,7 +272,7 @@ section_checkmk() {
     echo "<<<check_mk>>>"
     echo "Version: 2.3.0p21"
     echo "AgentOS: openwrt"
-    echo "Hostname: $(hostname)"
+    echo "Hostname: $(cat /proc/sys/kernel/hostname)"
     echo "AgentDirectory: ${MK_CONFDIR}"
     echo "DataDirectory: ${MK_VARDIR}"
     echo "SpoolDirectory: ${SPOOLDIR}"
@@ -857,7 +857,7 @@ section_veritas_vcs() {
     # Secure mode must be off to allow root to execute commands
     if [ -x /opt/VRTSvcs/bin/haclus ]; then
         echo "<<<veritas_vcs>>>"
-        vcshost=$(hostname | cut -d. -f1)
+        vcshost=$(cut -d. -f1 </proc/sys/kernel/hostname)
         waitmax -s 9 2 /opt/VRTSvcs/bin/haclus -display -localclus | grep -e ClusterName -e ClusState
         waitmax -s 9 2 /opt/VRTSvcs/bin/hasys -display -attribute SysState
         waitmax -s 9 2 /opt/VRTSvcs/bin/hagrp -display -sys "${vcshost}" -attribute State -localclus