Safeguard prefix directory operations in SVN testing

Given for some unforeseen error situation DIR is empty,
the trap wouldn't operate on the prefix but root.

We don't want that under any circumstances und prefer to exit in error.

Similarly, we don't want the `cd` operation to take CDPATH into account.

Author: hakre

test-svn.sh

@@ -1,14 +1,15 @@
 #!/bin/bash
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+DIR="$( CDPATH='' cd -- "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+[ "$DIR" ] || exit
 
 svn --help > /dev/null || { echo "Fail: could not find 'svn' executable"; exit 1; }
 svnadmin --help > /dev/null || { echo "Fail: could not find 'svnadmin' executable"; exit 1; }
 
 trap cleanup INT ERR
 
 function cleanup() {
-  cd "$DIR/test-data"
+  cd "$DIR/test-data" || exit
   rm -rf proj proj-working svnrepo
 }