ignore errors in global explorers

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

conf/explorer/hostname

@@ -1,6 +1,7 @@
 #!/bin/sh
 #
 # 2010-2011 Nico Schottelius (nico-cdist at schottelius.org)
+# 2012 Steven Armstrong (steven-cdist at armstrong.cc)
 #
 # This file is part of cdist.
 #
@@ -19,4 +20,6 @@
 #
 #
 
-hostname
+if which hostname >/dev/null 2>&1; then
+   hostname
+fi

conf/explorer/interfaces

@@ -29,6 +29,11 @@ if which ip >/dev/null 2>&1; then
     exit 0
 fi
 
+if ! which ifconfig >/dev/null 2>&1; then
+   # no ifconfig, nothing we could do
+   exit 0
+fi
+
 uname_s="$(uname -s)"
 REGEXP='s/^(.*)(:[[:space:]]*flags=|Link encap).*/\1/p'
 

conf/explorer/machine

@@ -22,4 +22,6 @@
 #
 #
 
-uname -m
+if which uname >/dev/null 2>&1; then
+   uname -m
+fi