From f81c864eede2a11bfeb849cb2a2634be034ed7fb Mon Sep 17 00:00:00 2001

From: Kairui Song <kasong@redhat.com>

Date: Wed, 25 Jul 2018 16:34:08 +0800

Subject: [PATCH] lsinitrd: allow to only unpack certain files

Before this patch, "--unpack" will always unpack the whole image.

Make "--unpack" be able to unpack only certain files, it will be

easier to retrieve files from initramfs image.

Signed-off-by: Kairui Song <kasong@redhat.com>

---

 lsinitrd.sh | 16 +++++++++++++---

 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lsinitrd.sh b/lsinitrd.sh

index 80fbf922..1b9a93b6 100755

--- a/lsinitrd.sh

+++ b/lsinitrd.sh

@@ -159,8 +159,15 @@ list_files()

 unpack_files()

 {

-    $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose

-    ((ret+=$?))

+    if (( ${#filenames[@]} > 0 )); then

+        for f in "${!filenames[@]}"; do

+            $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose $f

+            ((ret+=$?))

+        done

+    else

+        $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose

+        ((ret+=$?))

+    fi

 }

@@ -175,7 +182,10 @@ case $bin in

         CAT="cat --"

         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)

         if [[ "$is_early" ]]; then

-            if [[ -n "$unpackearly" ]]; then

+            if [[ -n "$unpack" ]]; then

+                # should use --unpackearly for early CPIO

+                :

+            elif [[ -n "$unpackearly" ]]; then

                 unpack_files

             elif (( ${#filenames[@]} > 0 )); then

                 extract_files