home-manager: use hostname from GNU inetutils

This partially reverts commit 89670e27e1.

Co-authored-by: Johannes Maier <johannes.maier@mailbox.org>

home-manager/default.nix

@@ -1,5 +1,5 @@
 { runCommand, lib, bash, callPackage, coreutils, findutils, gettext, gnused, jq
-, less, ncurses, unixtools
+, less, ncurses, inetutils
 # used for pkgs.path for nixos-option
 , pkgs
 
@@ -38,7 +38,7 @@ in runCommand "home-manager" {
         less
         ncurses
         nixos-option
-        unixtools.hostname
+        inetutils # for `hostname`
       ]
     }" \
     --subst-var-by HOME_MANAGER_LIB '${../lib/bash/home-manager.sh}' \

home-manager/home-manager

@@ -198,18 +198,9 @@ function setFlakeAttribute() {
                 ;;
             *)
                 local name="$USER"
-
-                local hostnameArray=()
-                # FQDN lookup can fail depending on the resolver.
-                local fqdn
-                if fqdn="$(hostname -f 2> /dev/null)"; then
-                    hostnameArray+=( "$USER@$fqdn"  )
-                fi
                 # Check FQDN, long, and short hostnames; long first to preserve
                 # pre-existing behaviour in case both happen to be defined.
-                hostnameArray+=( "$USER@$(hostname)" "$USER@$(hostname -s)" )
-
-                for n in "${hostnameArray[@]}"; do
+                for n in "$USER@$(hostname -f)" "$USER@$(hostname)" "$USER@$(hostname -s)"; do
                     if [[ "$(nix eval "$flake#homeConfigurations" --apply "x: x ? \"$n\"")" == "true" ]]; then
                         name="$n"
                         if [[ -v VERBOSE ]]; then