[pve-devel] [PATCH v2 storage 1/6] diskmanage: add change_parttype and is_partition helpers

[Fabian Ebner <f.ebner@proxmox.com>]

For change_parttype, only GPT-partitioned disks are supported, as I
didn't see an option for sgdisk to make it also work with
MBR-partitioned disks. And while sfdisk could be used instead (or
additionally) it would be a new dependency, and AFAICS require some
conversion of partition type GUIDs to MBR types on our part.

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
---

Changes from v1:
    * Add is_partition helper here, because it is used in the next
      patch.

 PVE/Diskmanage.pm | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/PVE/Diskmanage.pm b/PVE/Diskmanage.pm
index 36f452c..9d5b037 100644
--- a/PVE/Diskmanage.pm
+++ b/PVE/Diskmanage.pm
@@ -813,6 +813,12 @@ sub get_blockdev {
     return $block_dev;
 }
 
+sub is_partition {
+    my ($dev_path) = @_;
+
+    return defined(eval { get_partnum($dev_path) });
+}
+
 sub locked_disk_action {
     my ($sub) = @_;
     my $res = PVE::Tools::lock_file('/run/lock/pve-diskmanage.lck', undef, $sub);
@@ -903,6 +909,23 @@ sub is_mounted {
     return $found;
 }
 
+# Currently only supports GPT-partitioned disks.
+sub change_parttype {
+    my ($partpath, $parttype) = @_;
+
+    my $err = "unable to change partition type for $partpath";
+
+    my $partnum = get_partnum($partpath);
+    my $blockdev = get_blockdev($partpath);
+    my $dev = strip_dev($blockdev);
+
+    my $info = get_disks($dev, 1);
+    die "$err - unable to get disk info for '$blockdev'\n" if !defined($info->{$dev});
+    die "$err - disk '$blockdev' is not GPT partitioned\n" if !$info->{$dev}->{gpt};
+
+    run_command(['sgdisk', "-t${partnum}:${parttype}", $blockdev], errmsg => $err);
+}
+
 # Wipes all labels and the first 200 MiB of a disk/partition (or the whole if it is smaller).
 # Expected to be called with a result of verify_blockdev_path().
 sub wipe_blockdev {
-- 
2.30.2