Fix incorrect boot size

2 files changed, 7 insertions, 5 deletions

diff --git a/README b/README
index d5deba0..42a7f1c 100644
--- a/README
+++ b/README
@@ -40,8 +40,8 @@ CONFIGURATION:
 - swap_size: defaults to auto, but can be overwritten
   e.g: 'swap_size=8G'.
 
-- boot_size: defaults to 512M. Can be overwritten
-  e.g: 'boot_size=1G'.
+- boot_size: defaults to 512M.
+  Set 512M or more if duel-booting; e.g: 'boot_size=1G'.
 
 - timezone: a timezone (defined in '/usr/share/zoneinfo/').
 - locale: a locale (defined in '/etc/locale.gen').
diff --git a/install-artix.sh b/install-artix.sh
index 2ee0fe2..05e95e9 100755
--- a/install-artix.sh
+++ b/install-artix.sh
@@ -79,9 +79,10 @@ ram_gb=$(bc <<< "${ram_kB} / 1000^2")
     && swap_size="$(bc <<< "sqrt(${ram_gb}) * 4")G"
 
 # Get boot size if using an already created partition
-# (note: used for prompt confirmation)
+# (note: only used for prompt confirmation)
 if [[ $duel_boot == true ]]; then
-    boot_size=$(df -h "${boot}" | awk 'NR==2 {print $2}')
+    boot_bytes=$(blockdev --getsize64 "${boot}")
+    boot_size="$(bc <<< "${boot_bytes} / 1000000000")G"
 fi
 
 # Set boot type
@@ -96,7 +97,8 @@ else
 fi
 
 # Request confirmation
-drive_size=$(df -h "${drive}" | awk 'NR==2 {print $2}')
+drive_bytes=$(blockdev --getsize64 "${drive}")
+drive_size="$(bc <<< "${drive_bytes} / 1000000000")G"
 
 features=""
 [[ $encrypt == true ]] && features+="encrypt "