functions: add_full_dir: path prefix strip-off

Add third argument to add_full_dir: strip_prefix.
The strip_prefix will be stripped off from the destination
path (path in the initramfs image) when adding files.

Rationale: Make it easier to add rootfs overlay hooks when
generating images.

add_full_dir can be invoked in this way:

add_full_dir /path/on/parent/rootfs-overlay * /path/on/parent/rootfs-overlay

The above invocation will add all content of */path/on/parent/rootfs-overlay*
into */* in the initramfs image.

Signed-off-by: Erik Stromdahl <erik.stromdahl@gmail.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/functions b/functions
index 6cc74a4..0e1fe0f 100644
--- a/functions
+++ b/functions
@@ -433,8 +433,9 @@ add_full_dir() {
     # 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)
+    #   $3: path prefix that will be stripped off from the image path (optional)
 
-    local f= filter=${2:-*}
+    local f= filter=${2:-*} strip_prefix=$3
 
     if [[ -n $1 && -d $1 ]]; then
         add_dir "$1"
@@ -442,13 +443,13 @@ add_full_dir() {
         for f in "$1"/*; do
             if [[ -L $f ]]; then
                 if [[ $f = $filter ]]; then
-                    add_symlink "$f" "$(readlink "$f")"
+                    add_symlink "${f#$strip_prefix}" "$(readlink "$f")"
                 fi
             elif [[ -d $f ]]; then
-                add_full_dir "$f" "$filter"
+                add_full_dir "$f" "$filter" "$strip_prefix"
             elif [[ -f $f ]]; then
                 if [[ $f = $filter ]]; then
-                    add_file "$f"
+                    add_file "$f" "${f#$strip_prefix}"
                 fi
             fi
         done