From 764227657c87ea0c1b85bedfbece407c3a02535d Mon Sep 17 00:00:00 2001
From: Michael Prokop <mika@grml.org>
Date: Tue, 26 May 2020 11:04:40 +0200
Subject: [PATCH] zshsrc + zshenv: support hostnamectl iff hostname isn't
 present

The hostname binary doesn't necessarily exist, while hostnamectl
might be available.

Closes: grml/grml-etc-core#96
---
 etc/zsh/zshenv |  8 +++++++-
 etc/zsh/zshrc  | 21 ++++++++++++++++++---
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/etc/zsh/zshenv b/etc/zsh/zshenv
index 9a97788..9b70921 100644
--- a/etc/zsh/zshenv
+++ b/etc/zsh/zshenv
@@ -26,7 +26,13 @@
 [[ -r /etc/environment ]] && source /etc/environment
 
 # set environment variables (important for autologin on tty)
-export HOSTNAME=${HOSTNAME:-$(hostname)}
+if [ -n "${HOSTNAME}" ] ; then
+  export HOSTNAME="${HOSTNAME}"
+elif [[ -x $(which hostname) ]] ; then
+  export HOSTNAME="$(hostname)"
+elif [[ -x $(which hostnamectl) ]] ; then
+  export HOSTNAME="$(hostnamectl --static)"
+fi
 
 # make sure /usr/bin/id is available
 if [[ -x /usr/bin/id ]] ; then
diff --git a/etc/zsh/zshrc b/etc/zsh/zshrc
index 2969729..2875222 100644
--- a/etc/zsh/zshrc
+++ b/etc/zsh/zshrc
@@ -837,8 +837,16 @@ function grmlcomp () {
         _ssh_hosts=()
         _etc_hosts=()
     fi
+
+    local localname
+    if check_com hostname ; then
+      localname=$(hostname)
+    elif check_com hostnamectl ; then
+      localname=$(hostnamectl --static)
+    fi
+
     hosts=(
-        $(hostname)
+        "${localname}"
         "$_ssh_config_hosts[@]"
         "$_ssh_hosts[@]"
         "$_etc_hosts[@]"
@@ -2509,8 +2517,15 @@ function grml_vcs_to_screen_title () {
 }
 
 function grml_maintain_name () {
-    # set hostname if not running on host with name 'grml'
-    if [[ -n "$HOSTNAME" ]] && [[ "$HOSTNAME" != $(hostname) ]] ; then
+    local localname
+    if check_com hostname ; then
+      localname=$(hostname)
+    elif check_com hostnamectl ; then
+      localname=$(hostnamectl --static)
+    fi
+
+    # set hostname if not running on local machine
+    if [[ -n "$HOSTNAME" ]] && [[ "$HOSTNAME" != "${localname}" ]] ; then
        NAME="@$HOSTNAME"
     fi
 }
-- 
2.1.4