From: Benjamin Drung <benjamin.drung@canonical.com>
Date: Fri, 19 Sep 2025 19:11:42 +0200
Subject: fix(lsinitrd): use lowercase skip variable name

The test Makefile takes a `SKIP` environment variable to skip tests.
This variable might leak into `lsinitrd`:

```
$ make -C test V=1 check SKIP="23 30 43 50 60 70 71 72"
[...]
/usr/bin/lsinitrd: line 467: 23: command not found
```

Rename the `SKIP` variable to use lowercase and unset this variable to
avoid leaking values into it.

Forwarded: https://github.com/dracut-ng/dracut-ng/pull/1683
---
 lsinitrd.sh | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/lsinitrd.sh b/lsinitrd.sh
index fb34a24..3d2458b 100755
--- a/lsinitrd.sh
+++ b/lsinitrd.sh
@@ -427,6 +427,7 @@ if ((${#filenames[@]} <= 0)) && [[ -z $unpack ]] && [[ -z $unpackearly ]]; then
     echo "========================================================================"
 fi
 
+unset skip
 read -r -N 6 bin < "$image"
 case $bin in
     $'\x71\xc7'* | 070701)
@@ -448,13 +449,13 @@ case $bin in
                 list_files
             fi
             if [[ -f "$dracutbasedir/src/skipcpio/skipcpio" ]]; then
-                SKIP="$dracutbasedir/src/skipcpio/skipcpio"
+                skip="$dracutbasedir/src/skipcpio/skipcpio"
             else
-                SKIP="$dracutbasedir/skipcpio"
+                skip="$dracutbasedir/skipcpio"
             fi
-            if ! [[ -x $SKIP ]]; then
+            if ! [[ -x $skip ]]; then
                 echo
-                echo "'$SKIP' not found, cannot display remaining contents!" >&2
+                echo "'$skip' not found, cannot display remaining contents!" >&2
                 echo
                 exit 0
             fi
@@ -462,8 +463,8 @@ case $bin in
         ;;
 esac
 
-if [[ $SKIP ]]; then
-    bin="$($SKIP "$image" | { read -r -N 6 bin && echo "$bin"; })"
+if [[ $skip ]]; then
+    bin="$($skip "$image" | { read -r -N 6 bin && echo "$bin"; })"
 else
     read -r -N 6 bin < "$image"
 fi
@@ -502,11 +503,11 @@ type "${CAT%% *}" > /dev/null 2>&1 || {
 
 # shellcheck disable=SC2317,SC2329  # assigned to CAT and $CAT called later
 skipcpio() {
-    $SKIP "$@" | $ORIG_CAT
+    $skip "$@" | $ORIG_CAT
 }
 
 PARTS="1-"
-if [[ $SKIP ]]; then
+if [[ $skip ]]; then
     ORIG_CAT="$CAT"
     CAT=skipcpio
     PARTS="2-"