edit the vm config via PVE::Tools::edit_file minus the snapshot sections
(we do not want to update those manually)

Signed-off-by: Dominik Csapak <d.csa...@proxmox.com>
---
changes since v2:
* use PVE::Tools::edit_file
* do not remove pending section, as one might want to edit that directly
* use correct completion helper (complete_vmid instead of _running)
 PVE/CLI/qm.pm | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/PVE/CLI/qm.pm b/PVE/CLI/qm.pm
index 90a44ef..e567091 100755
--- a/PVE/CLI/qm.pm
+++ b/PVE/CLI/qm.pm
@@ -606,6 +606,65 @@ __PACKAGE__->register_method ({
     }
 });
 
+__PACKAGE__->register_method ({
+    name => 'edit',
+    path => 'edit',
+    method => 'POST',
+    description => "Opens the VM config file in the editor set via 
update-alternatives.".
+                  "This does not actually change the VM without turning it off 
and on.",
+    parameters => {
+       additionalProperties => 0,
+       properties => {
+           vmid => get_standard_option('pve-vmid', { completion => 
\&PVE::QemuServer::complete_vmid }),
+       },
+    },
+    returns => { type => 'null'},
+    code => sub {
+       my ($param) = @_;
+
+       my $vmid = $param->{vmid};
+       my $digest;
+
+       my $readfn = sub {
+           # load config of vm
+           my $oldconf = PVE::QemuConfig->load_config($vmid);
+
+           # for later check
+           $digest = $oldconf->{digest};
+
+           # we do not want to edit snapshots
+           delete $oldconf->{snapshots};
+
+           # write_vm_config returns the raw content
+           return PVE::QemuServer::write_vm_config("/qemu-server/$vmid.conf", 
$oldconf);
+       };
+
+       my $writefn = sub {
+           my ($content) = @_;
+           PVE::QemuConfig->lock_config($vmid, sub {
+
+               # update cluster file system to avoid config cache
+               PVE::Cluster::cfs_update();
+               my $conf = PVE::QemuConfig->load_config($vmid);
+
+               PVE::Tools::assert_if_modified($digest, $conf->{digest});
+
+               my $newconf = 
PVE::QemuServer::parse_vm_config("/qemu-server/$vmid.conf", $content);
+
+               # use the snapshots from the original config
+               $newconf->{snapshots} = $conf->{snapshots};
+
+               # write config back
+               PVE::QemuConfig->write_config($vmid, $newconf);
+           });
+       };
+
+       PVE::Tools::edit_file($readfn, $writefn);
+
+       return undef;
+    }});
+
+
 my $print_agent_result = sub {
     my ($data) = @_;
 
@@ -765,6 +824,8 @@ our $cmddef = {
 
     importovf => [ __PACKAGE__, 'importovf', ['vmid', 'manifest', 'storage']],
 
+    edit => [ __PACKAGE__, 'edit', ['vmid']],
+
 };
 
 1;
-- 
2.11.0


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