diff --git a/bin/_blackbox_common.sh b/bin/_blackbox_common.sh
index 4e9ecf5..eaf4bd3 100755
--- a/bin/_blackbox_common.sh
+++ b/bin/_blackbox_common.sh
@@ -390,3 +390,17 @@ function vcs_remove_git() {
 function vcs_remove_svn() {
   svn delete """$@"""
 }
+
+function change_to_root() {
+    # If BASEDIR is not set, use REPOBASE.
+    if [[ "$BASEDIR" = "" ]]; then
+      BASEDIR="$REPOBASE"
+    fi
+
+    if [[ "$BASEDIR" = "/dev/null" ]]; then
+      echo 'WARNING: Not in a VCS repo.  Not changing directory.'
+    else
+      echo "CDing to $BASEDIR"
+      cd "$BASEDIR"
+    fi
+}
diff --git a/bin/blackbox_postdeploy b/bin/blackbox_postdeploy
index 8e285ae..18c9fe1 100755
--- a/bin/blackbox_postdeploy
+++ b/bin/blackbox_postdeploy
@@ -22,18 +22,7 @@ else
   FILE_GROUP="$1"
 fi
 
-# If BASEDIR is not set, use REPOBASE.
-if [[ "$BASEDIR" = "" ]]; then
-  BASEDIR="$REPOBASE"
-fi
-
-if [[ "$BASEDIR" = "/dev/null" ]]; then
-  echo 'WARNING: Not in a VCS repo.  Not changing directory.'
-else
-  echo "CDing to $BASEDIR"
-  cd "$BASEDIR"
-fi
-
+change_to_root
 prepare_keychain
 
 # Decrypt:
diff --git a/bin/blackbox_shred_all_files b/bin/blackbox_shred_all_files
index 636633c..74bbfc7 100755
--- a/bin/blackbox_shred_all_files
+++ b/bin/blackbox_shred_all_files
@@ -18,6 +18,8 @@
 set -e
 . _blackbox_common.sh
 
+change_to_root
+
 echo '========== FILES BEING SHREDDED:'
 for i in $(<$BB_FILES) ; do
   unencrypted_file=$(get_unencrypted_filename "$i")