fix: use cloud-init to grow partition and resize fs (#107)

kvm-install-vm

@@ -589,6 +589,14 @@ ssh_authorized_keys:
   - ${KEY}
 
 timezone: ${TIMEZONE}
+
+# Disk and filesystem growth
+growpart:
+  mode: auto
+  devices: ['/']
+  ignore_growroot_disabled: false
+
+resize_rootfs: true
 _EOF_
 
     if [ ! -z "${SCRIPTNAME+x}" ]; then
@@ -624,23 +632,11 @@ _EOF_
 
     if $RESIZE_DISK; then
         outputn "Resizing the disk to $DISK_SIZE"
-        # Workaround to prevent virt-resize from renumbering partitions and breaking grub
-        # See https://bugzilla.redhat.com/show_bug.cgi?id=1472039
-        # Ubuntu will automatically grow the partition to the new size on its first boot
-        case "$DISTRO" in
-            ubuntu* | amazon2)
-                qemu-img resize $DISK $DISK_SIZE &>> ${VMNAME}.log &&
-                    ok ||
-                    die "Could not resize disk."
-                ;;
-            *)
-                qemu-img create -f qcow2 \
-                    -o preallocation=metadata $DISK.new $DISK_SIZE &>> ${VMNAME}.log &&
-                    virt-resize --quiet --expand /dev/sda1 $DISK $DISK.new &>> ${VMNAME}.log &&
-                    (mv $DISK.new $DISK && ok) ||
-                    die "Could not resize disk."
-                ;;
-        esac
+        # Cloud-init will automatically grow the partition and filesystem on first boot
+        # via the growpart and resize_rootfs modules configured in user-data
+        qemu-img resize $DISK $DISK_SIZE &>> ${VMNAME}.log &&
+            ok ||
+            die "Could not resize disk."
     fi
 
     # Create new storage pool for new VM

tests/check_disk_expansion.bats

@@ -0,0 +1,23 @@
+#!/usr/bin/env bats
+
+teardown() {
+    # Clean up specific VMs that THIS test might have created
+    ./kvm-install-vm remove "${VMPREFIX}"-expand-15g 2>/dev/null || true
+}
+
+@test "VM creation with -d 15 expands disk to 15GB" {
+    # Create VM with 15GB disk
+    run timeout $TIMEOUT ./kvm-install-vm create -d 15 "${VMPREFIX}"-expand-15g
+    [ "$status" -eq 0 ]
+    [[ "${output}" =~ "Resizing the disk to 15G" ]]
+
+    # Shut down VM to release disk lock for qemu-img
+    virsh shutdown "${VMPREFIX}"-expand-15g
+    sleep 10
+
+    # Verify disk size using qemu-img info
+    DISK_PATH="${VMDIR}/${VMPREFIX}-expand-15g/${VMPREFIX}-expand-15g.qcow2"
+    run qemu-img info "$DISK_PATH"
+    [ "$status" -eq 0 ]
+    [[ "${output}" =~ "virtual size: 15 GiB" ]]
+}