implement qemu-img convert command

Signed-off-by: Alexandre Derumier <aderum...@odiso.com>
---
 PVE/QemuServer.pm |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 2cb7deb..5c2b26b 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -4031,4 +4031,33 @@ sub snapshot_delete {
     lock_config($vmid, $updatefn);
 }
 
+sub qemu_img_convert {
+    my ($src_volid, $dst_volid) = @_;
+
+    my $storecfg = PVE::Storage::config();
+    my ($src_storeid, $src_volname) = 
PVE::Storage::parse_volume_id($src_volid, 1);
+    my ($dst_storeid, $dst_volname) = 
PVE::Storage::parse_volume_id($dst_volid, 1);
+
+    if ($src_storeid && $dst_storeid) {
+       my $src_scfg = PVE::Storage::storage_config($storecfg, $src_storeid);
+       my $dst_scfg = PVE::Storage::storage_config($storecfg, $dst_storeid);
+
+       my $src_format = qemu_img_format($src_scfg, $src_volname);
+       my $dst_format = qemu_img_format($dst_scfg, $dst_volname);
+
+       PVE::Storage::activate_volumes($storecfg, [ $dst_volid ]) if 
$dst_format =~ m/(host_device|iscsi)/;
+
+       my $src_path = PVE::Storage::path($storecfg, $src_volid);
+       my $dst_path = PVE::Storage::path($storecfg, $dst_volid);
+
+       my $cmd = ['/usr/bin/qemu-img', 'convert', '-p', '-f', $src_format, 
'-O', $dst_format, $src_path, $dst_path];
+       #fixme, display progress percent while cmd is running 
+        eval  { run_command($cmd, timeout => undef); };
+        my $err = $@;
+        die "copy failed: $err" if $err;
+
+    }
+       
+}
+
 1;
-- 
1.7.10.4

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