support a dumb variable for root path /

2 files changed, 9 insertions, 1 deletions

diff --git a/README.md b/README.md
index 3b37c7e..3a96530 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,8 @@ More precisely, the corresponding directory names must match the
 Consequently, `ProgramFiles(x86)` (and other weird variable names Windows
 allows) are not supported.
 
+A special variable name `CONFIG_LINKS_ROOT` is resolved to the root path, "/".
+
 License
 -------
 
diff --git a/update.sh b/update.sh
index 77a48a1..3d64cb6 100755
--- a/update.sh
+++ b/update.sh
@@ -161,6 +161,11 @@ resolve_variable() {
         return 0
     fi
 
+    if [ "$var_name" = "$root_var_name" ]; then
+        echo ''
+        return 0
+    fi
+
     if [ -z "${!var_name+x}" ]; then
         dump "variable is not set: $var_name" >&2
         return 1
@@ -178,6 +183,7 @@ cache_variable() {
     done
 }
 
+readonly root_var_name='CONFIG_LINKS_ROOT'
 readonly var_name_regex='%\([_[:alpha:]][_[:alnum:]]*\)%'
 
 extract_variable_name() {
@@ -278,7 +284,7 @@ delete_obsolete_dirs() {
         return 1
     fi
 
-    ( cd -- "$base_dir" && rmdir -p --ignore-fail-on-non-empty -- "$subpath" )
+    ( cd -- "$base_dir/" && rmdir -p --ignore-fail-on-non-empty -- "$subpath" )
 }
 
 delete_obsolete_entries() {