Parse ``--repo`` arguments in wrapper script

This allows the user to specify a different repository directory and have the
wrapper script use it instead of the hardwired default one.

scripts/ouinet-wrapper.sh

@@ -5,6 +5,28 @@
 
 set -e
 
+# Checks for args overriding the default repository.
+get_repo_from_args() {
+    local arg setnext=n repo
+    for arg in "$@"; do
+        if [ "$setnext" = y ]; then
+            repo="$arg"  # previous arg was "--repo"
+            setnext=n
+            continue
+        fi
+        case "$arg" in
+            (--repo=*)
+                repo="${arg#--repo=}"
+                ;;
+            (--repo)
+                setnext=y
+                ;;
+            (*) ;;
+        esac
+    done
+    echo "$repo"
+}
+
 case "$1" in
     (injector|client) ;;
     (*) echo "Please specify whether to run the injector or the client." >&2
@@ -18,8 +40,15 @@ PROG=$1
 CONF=/var/opt/ouinet/$PROG/ouinet-$PROG.conf
 REPO=$(dirname $CONF)
 
+repo_arg=$(get_repo_from_args "$@")
+REPO="${repo_arg:-$REPO}"
+
 if [ ! -d "$REPO" ]; then
     cp -r "$INST/repo-templates/$PROG" "$REPO"
 fi
 
-exec "$INST/$PROG" --repo "$REPO" "$@"
+if [ "$repo_arg" ]; then
+    exec "$INST/$PROG" "$@"
+else
+    exec "$INST/$PROG" --repo "$REPO" "$@"
+fi