From d4af288f0ef6699a11364a165ef1f5745bade4af Mon Sep 17 00:00:00 2001
From: Benjamin Drung <benjamin.drung@canonical.com>
Date: Sat, 8 Nov 2025 14:54:43 +0100
Subject: [PATCH] test: determine rootfs size dynamically

Do not hard-code the size of the rootfs, but determine the needed size
dynamically. This will speed up the creation time for smaller content
and prevent failures in case of bigger content.
---
 test/test-functions | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/test/test-functions b/test/test-functions
index dc93361e4..466466530 100644
--- a/test/test-functions
+++ b/test/test-functions
@@ -177,7 +177,12 @@ build_ext4_image() {
     local image="$2"
     local label="$3"
 
-    dd if=/dev/zero of="$image" bs=200MiB count=1 status=none
+    local size
+    size="$(du --summarize --block-size 1 "${source_dir}" | cut -f 1)"
+    # Add 8 MB for ext4 journal
+    size="$((size + 8000000))"
+
+    dd if=/dev/zero of="$image" bs="$size" count=1 status=none
     sync "$image"
     mkfs.ext4 -q -L "$label" -d "$source_dir" "$image"
     sync "$image"
-- 
2.47.3