From 8a1a2c1f7cad76e8a1f6fd8f6f94b204b6ebd5b5 Mon Sep 17 00:00:00 2001
From: Reuben Miller <reuben.d.miller@gmail.com>
Date: Thu, 11 Jan 2024 18:21:58 +0100
Subject: [PATCH] fix(build): auto detection when to use when compressing the
 image using xz

---
 scripts/compress.sh | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/scripts/compress.sh b/scripts/compress.sh
index a543c0d..d28b3c1 100755
--- a/scripts/compress.sh
+++ b/scripts/compress.sh
@@ -2,10 +2,24 @@
 set -e
 
 SUDO=
-if [ -n "$CI" ]; then
-    # use sudo when running in the CI otherwise the following error occurs
-    # regardless of the owner of the file and folder.
-    # xz: Cannot set the file group: Operation not permitted
+
+test_xz() {
+    # Check if xz can be used without sudo using a dummy file
+    echo "dummy" > .dummy_compress
+    failed=0
+    if ! xz -0 -v .dummy_compress >/dev/null >&2; then
+        failed=1
+    fi
+    rm -f .dummy_compress
+    rm -f .dummy_compress.xz
+    return "$failed"
+}
+
+# use sudo when running in the CI otherwise the following error occurs
+# regardless of the owner of the file and folder.
+# xz: Cannot set the file group: Operation not permitted
+if ! test_xz; then
+    echo "xz test file returned a warning, so compressing using sudo" >&2
     SUDO=sudo
 fi