[pve-devel] [PATCH pve-container 1/3] fix #3711: enable delete of LXC container via force option

[Stefan Hrdlicka <s.hrdlicka@proxmox.com>]

Make it possible to delete a container whoes underlying storage is no
longer available. This will just write an warning instead of dying.

Without setting the option force-remove-storage=1 a delete will still
fail, like it did before the changes. With this option set it will try to
delete the volume from the storage. If this fails it writes a warning.

Signed-off-by: Stefan Hrdlicka <s.hrdlicka@proxmox.com>
---
 src/PVE/API2/LXC.pm |  8 ++++++++
 src/PVE/LXC.pm      | 20 +++++++++++++++-----
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/PVE/API2/LXC.pm b/src/PVE/API2/LXC.pm
index 589f96f..4d785c9 100644
--- a/src/PVE/API2/LXC.pm
+++ b/src/PVE/API2/LXC.pm
@@ -697,6 +697,13 @@ __PACKAGE__->register_method({
 		    ." enabled storages which are not referenced in the config.",
 		optional => 1,
 	    },
+	    'force-remove-storage' => {
+		type => 'boolean',
+		description => 'If set, this will ignore errors when trying to remove LXC'
+		    . ' container storage.',
+		default => 0,
+		optional => 1,
+	    }
 	},
     },
     returns => {
@@ -758,6 +765,7 @@ __PACKAGE__->register_method({
 		$conf,
 		{ lock => 'destroyed' },
 		$param->{'destroy-unreferenced-disks'},
+		$param->{'force-remove-storage'},
 	    );
 
 	    PVE::AccessControl::remove_vm_access($vmid);
diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index fe63087..74c8d17 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -848,13 +848,22 @@ sub get_primary_ips {
 }
 
 sub delete_mountpoint_volume {
-    my ($storage_cfg, $vmid, $volume) = @_;
+    my ($storage_cfg, $vmid, $volume, $force_remove_storage) = @_;
 
     return if PVE::LXC::Config->classify_mountpoint($volume) ne 'volume';
 
-    my ($vtype, $name, $owner) = PVE::Storage::parse_volname($storage_cfg, $volume);
+    my ($vtype, $name, $owner);
+    eval {
+	($vtype, $name, $owner) = PVE::Storage::parse_volname($storage_cfg, $volume);
+    };
 
-    if ($vmid == $owner) {
+    if (!$force_remove_storage && $@) {
+	die $@;
+    } elsif ($@) {
+	# $force_remove_storage == true is implied here
+	warn "storage not available, can't remove $volume disk image, continuing!\n"
+	    . "error: $@\n";
+    } elsif ($vmid == $owner) {
 	PVE::Storage::vdisk_free($storage_cfg, $volume);
     } else {
 	warn "ignore deletion of '$volume', CT $vmid isn't the owner!\n";
@@ -862,7 +871,8 @@ sub delete_mountpoint_volume {
 }
 
 sub destroy_lxc_container {
-    my ($storage_cfg, $vmid, $conf, $replacement_conf, $purge_unreferenced) = @_;
+    my ($storage_cfg, $vmid, $conf, $replacement_conf,
+	$purge_unreferenced, $force_remove_storage) = @_;
 
     my $volids = {};
     my $remove_volume = sub {
@@ -873,7 +883,7 @@ sub destroy_lxc_container {
 	return if $volids->{$volume};
 	$volids->{$volume} = 1;
 
-	delete_mountpoint_volume($storage_cfg, $vmid, $volume);
+	delete_mountpoint_volume($storage_cfg, $vmid, $volume, $force_remove_storage);
     };
     PVE::LXC::Config->foreach_volume_full($conf, {include_unused => 1}, $remove_volume);
 
-- 
2.30.2