better reporting of insufficient space (mga#15257)

When the live installer checks if there is sufficient space on the
chosen root partition it subtracts 10% (or 65MB) from the available
space to give some headroom. It's better to add the headroom to the
required space, as this gives a more accurate message when there is
insufficient space.

2 files changed, 5 insertions, 2 deletions

diff --git a/NEWS b/NEWS
index 4fd00bf..25e9b97 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,5 @@
+- better reporting of insufficient space (mga#15257)
+
 2.4
 - fix loosing i18n settings on !live install (mga#15273)
 
diff --git a/draklive-install b/draklive-install
index e54245e..eacbc1d 100755
--- a/draklive-install
+++ b/draklive-install
@@ -176,8 +176,9 @@ sub ask_partitions {
     fs::any::check_hds_boot_and_root($all_hds, $fstab);
     fs::partitioning::choose_partitions_to_format($in, $fstab);
 
-    my $total = get_total_size($in, $copy_source);
-    my $available = fs::any::getAvailableSpace($fstab, 'skip_mounted');
+    my $total = get_total_size($in, $copy_source)
+    my $available = fs::any::getAvailableSpace($fstab, 'skip_mounted', 1);
+    $total += fs::any::getNeededMinSpace($available);
     die N("Not enough space available (%s available while %s are needed)",
           formatXiB($available), formatXiB($total)) . "\n"
       if $total > $available;