Description: Fix update-initramfs crash on empty override directory
 The acpi-override hook script unconditionally executes a copy command
 using a wildcard (*). When the /var/lib/acpi-override/ directory is
 empty (default state), this command fails, causing update-initramfs
 to exit with an error code.
 .
 This patch adds a conditional check to ensure the directory exists
 and is populated before attempting the copy operation.
Author: YIN Renlong <info@yin.roma.it>
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/acpi-override/+bug/1892035
Bug-Debian: https://bugs.debian.org/968604
Last-Update: 2026-01-27
Index: acpi-override-0.1+nmu1/acpi-override
===================================================================
--- acpi-override-0.1+nmu1.orig/acpi-override
+++ acpi-override-0.1+nmu1/acpi-override
@@ -15,8 +15,13 @@ esac
 ACPI="$(mktemp -d "${TMPDIR:-/var/tmp}/initramfs_acpi_XXXXXX")" || exit 1
 ACPI_CPIO="$(mktemp "${TMPDIR:-/var/tmp}/initramfs_acpi_XXXXXX_cpio")" || exit 1
 mkdir -p "$ACPI/kernel/firmware/acpi/"
-cp -a /var/lib/acpi-override/* "$ACPI/kernel/firmware/acpi/" || exit 1
- ( ( cd "$ACPI" ; find . | cpio -o -H newc ) ) > "$ACPI_CPIO"
+
+# FIX: Only attempt to copy files if the override directory exists and is not empty.
+if [ -d "/var/lib/acpi-override" ] && [ -n "$(ls -A /var/lib/acpi-override/)" ]; then
+    cp -a /var/lib/acpi-override/* "$ACPI/kernel/firmware/acpi/" || exit 1
+fi
+
+( ( cd "$ACPI" ; find . | cpio -o -H newc ) ) > "$ACPI_CPIO"
 
 prepend_earlyinitramfs "$ACPI_CPIO"