Raise an error when system name is invalid

This is better than proceeding to add a system with a different name
to the one the user specified, without telling them that the name was
mangled.

1 files changed, 15 insertions, 2 deletions

diff --git a/manage-baserock b/manage-baserock
index acee510..8210812 100755
--- a/manage-baserock
+++ b/manage-baserock
@@ -21,9 +21,20 @@
 BASEROCK_BASE="${BASEROCK_BASE:-/opt/baserock/chroots}"
 
 ACTION="$1"
-SYSTEM=$(echo $2 | tr -c -d A-Za-z0-9_-.)
+SYSTEM="$2"
 URL="$3"
 
+check_system_name () {
+    local system="$1"
+    local valid_chars='A-Za-z0-9_-.'
+    case $system in
+    *[^${valid_chars}]*)
+        echo "The specified name '${system}' contains invalid characters."
+        echo "Valid characters are ${valid_chars}."
+        exit 1
+    esac
+}
+
 list_baserocks () {
     (cd "${BASEROCK_BASE}" && ls -d */baserock) 2>/dev/null | sed -e's@/baserock$@@'
 }
@@ -43,6 +54,8 @@ case "${ACTION}" in
             exec sudo "$0" "$@"
         fi
 
+        check_system_name $SYSTEM
+
         if test -d "${BASEROCK_BASE}/${SYSTEM}/baserock"; then
             echo "Sorry, $SYSTEM already exists"
             exit 1
@@ -105,7 +118,7 @@ EOF
         fi
 
         br-ct-sync-chroots
-        
+
         ;;
     rm)
         if test $(id -u) != "0"; then