[__hostname] Add support for macosx

cdist/conf/type/__hostname/explorer/hostname

@@ -41,7 +41,7 @@ elif [ -f /etc/myname ]; then
 elif [ "$(uname -s)" == FreeBSD ]; then
     (. /etc/rc.conf && echo $hostname)
 # Mac OS X
-elif [ "$(uname -s)" == Darwin -a -f "$(command -v scutil)" ]; then
+elif [ "$(uname -s)" == Darwin -a -x "$(command -v scutil)" ]; then
     scutil --get HostName 2>/dev/null || hostname -s
 else
     command -v hostname && hostname -s

cdist/conf/type/__hostname/gencode-remote

@@ -86,6 +86,9 @@ case "$os" in
         echo "hostname '$name_should'"
         printf "printf '%%s\\\\n' '$name_should' > /etc/HOSTNAME\\n"
     ;;
+    macosx)
+        echo "scutil --set HostName '$name_should'"
+    ;;
     *)
         echo "echo 'Unsupported OS: $os' >&2; exit 1"
     ;;

cdist/conf/type/__hostname/manifest

@@ -42,7 +42,7 @@ not_supported() {
 }
 
 case "$os" in
-    archlinux|debian|suse|ubuntu|devuan|coreos|alpine)
+    archlinux|debian|suse|ubuntu|devuan|coreos|alpine|macosx)
         # handled in gencode-remote
         :
     ;;