build_chroot: check whether the data dir exists

If the data directory is not in the expected place, the script complains
with an error message and stops, instead of giving obscure messages.

Partially fixes Issue 459.

Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

diff --git a/devel/build_chroot b/devel/build_chroot
index d281c20..926c74a 100755 (executable)
--- a/devel/build_chroot
+++ b/devel/build_chroot
@@ -34,6 +34,16 @@ then
   exit
 fi
 
+if [ ! -d $DATA_DIR ]
+then
+  echo "The data directory"
+  echo "  $DATA_DIR"
+  echo "does not exist."
+  echo "Please, set the DATA_DIR environment variable so that it points to the"
+  echo "data directory."
+  exit
+fi
+
 set -e
 
 #Cleanup