test: do not attempt to set xattr on tmpfs

This is only possible since a recent kernel version, and fails otherwise,
like on CentOS 9

diff --git a/test/units/TEST-29-PORTABLE.sh b/test/units/TEST-29-PORTABLE.sh
index b4dcd5a1a294684210bb20ef6cb84c3d1c69a848..41dce4d48a0da90088f3b12cdc2a1d3dbcd0edd0 100755 (executable)
--- a/test/units/TEST-29-PORTABLE.sh
+++ b/test/units/TEST-29-PORTABLE.sh
@@ -355,15 +355,16 @@ portablectl "${ARGS[@]}" attach --copy=symlink --now --runtime /tmp/rootdir mini
 portablectl detach --now --runtime --enable /tmp/rootdir minimal-app0
 
 # The wrong file should be ignored, given the right one has the xattr set
-mkdir -p /tmp/wrongext/usr/lib/extension-release.d /tmp/wrongext/usr/lib/systemd/system/
-echo "[Service]" > /tmp/wrongext/usr/lib/systemd/system/app0.service
-touch /tmp/wrongext/usr/lib/extension-release.d/extension-release.wrongext_somethingwrong.txt
-cp /tmp/rootdir/usr/lib/os-release /tmp/wrongext/usr/lib/extension-release.d/extension-release.app0
-setfattr -n user.extension-release.strict -v "false" /tmp/wrongext/usr/lib/extension-release.d/extension-release.app0
-portablectl "${ARGS[@]}" attach --runtime --extension /tmp/wrongext /tmp/rootdir app0
+trap 'rm -rf /var/cache/wrongext' EXIT
+mkdir -p /var/cache/wrongext/usr/lib/extension-release.d /var/cache/wrongext/usr/lib/systemd/system/
+echo "[Service]" > /var/cache/wrongext/usr/lib/systemd/system/app0.service
+touch /var/cache/wrongext/usr/lib/extension-release.d/extension-release.wrongext_somethingwrong.txt
+cp /tmp/rootdir/usr/lib/os-release /var/cache/wrongext/usr/lib/extension-release.d/extension-release.app0
+setfattr -n user.extension-release.strict -v "false" /var/cache/wrongext/usr/lib/extension-release.d/extension-release.app0
+portablectl "${ARGS[@]}" attach --runtime --extension /var/cache/wrongext /tmp/rootdir app0
 status="$(portablectl is-attached --extension wrongext rootdir)"
 [[ "${status}" == "attached-runtime" ]]
-portablectl detach --runtime --extension /tmp/wrongext /tmp/rootdir app0
+portablectl detach --runtime --extension /var/cache/wrongext /tmp/rootdir app0
 
 umount /tmp/rootdir
 umount /tmp/app0