add second param to add_full_dir to allow filtering files

Use this to only add files matching *.conf in the modconf hook.

Fixes FS#39994.

functions

@@ -414,19 +414,20 @@ add_full_dir() {
     # Add a directory and all its contents, recursively, to the initcpio image.
     # No parsing is performed and the contents of the directory is added as is.
     #   $1: path to directory
+    #   $2: glob pattern to filter file additions (optional)
 
-    local f=
+    local f= filter=${2:-*}
 
     if [[ -n $1 && -d $1 ]]; then
         add_dir "$1"
 
         for f in "$1"/*; do
             if [[ -L $f ]]; then
-                add_symlink "$f" "$(readlink "$f")"
+                [[ $f = $filter ]] && add_symlink "$f" "$(readlink "$f")"
             elif [[ -d $f ]]; then
                 add_full_dir "$f"
             elif [[ -f $f ]]; then
-                add_file "$f"
+                [[ $f = $filter ]] && add_file "$f"
             fi
         done
     fi

install/modconf

@@ -1,8 +1,8 @@
 #!/bin/bash
 
 build() {
-  add_full_dir /etc/modprobe.d
-  add_full_dir /usr/lib/modprobe.d
+  add_full_dir /etc/modprobe.d '*.conf'
+  add_full_dir /usr/lib/modprobe.d '*.conf'
 }
 
 help() {

man/mkinitcpio.8.txt

@@ -138,12 +138,15 @@ functions exist to facilitate this.
 
 	Adds a directory and its parents to the image.
 
-*add_full_dir* 'directory'::
+*add_full_dir* 'directory' [ 'glob' ]::
 
 	Recursively adds a directory to the image by walking the given path and
 	calling *add_file*, *add_dir*, and *add_symlink* accordingly. This function
 	will not follow symlinks, nor will it add the targets of symlinks.
 
+	If the 'glob' argument is passed, only files and symlinks matching this glob
+	will be added.
+
 *add_symlink* 'path' [ 'link-target' ]::
 
 	Adds a symlink to the image at the specified `path`, optionally pointing to