[pve-devel] [PATCH 01/14] add template_create and template_delete feature

[Alexandre Derumier]

A template is protected config + volumes.
Can be current config or snapshot.

template_create:

-we lock volume if storage need it for clone (files or rbd)
-then we add template:1 to the config (current or snapshot)

template_delete:

- We need to check if clones of volumes exist before remove the template
- We unlock the storage
- we remove template:1 from the config (current of snapshot)

Signed-off-by: Alexandre Derumier <aderumier at odiso.com>
---
 PVE/API2/Qemu.pm  |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 PVE/QemuServer.pm |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 qm                |    2 ++
 3 files changed, 158 insertions(+)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 487fde2..91cf569 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -2298,4 +2298,82 @@ __PACKAGE__->register_method({
 	return $rpcenv->fork_worker('qmdelsnapshot', $vmid, $authuser, $realcmd);
     }});
 
+__PACKAGE__->register_method({
+    name => 'template',
+    path => '{vmid}/template',
+    method => 'POST',
+    protected => 1,
+    proxyto => 'node',
+    description => "Create a Template.",
+    permissions => {
+	check => ['perm', '/vms/{vmid}', [ 'VM.Template' ]],
+    },
+    parameters => {
+	additionalProperties => 0,
+	properties => {
+	    node => get_standard_option('pve-node'),
+	    vmid => get_standard_option('pve-vmid'),
+	    snapname => get_standard_option('pve-snapshot-name', {
+		optional => 1,
+	    }),
+	    delete => {
+		optional => 1,
+		type => 'boolean',
+	    },
+	},
+    },
+    returns => { type => 'null'},
+    code => sub {
+	my ($param) = @_;
+
+	my $rpcenv = PVE::RPCEnvironment::get();
+
+	my $authuser = $rpcenv->get_user();
+
+	my $node = extract_param($param, 'node');
+
+	my $vmid = extract_param($param, 'vmid');
+
+	my $snapname = extract_param($param, 'snapname');
+
+	my $delete = extract_param($param, 'delete');
+
+	my $updatefn =  sub {
+
+	    my $conf = PVE::QemuServer::load_config($vmid);
+
+	    PVE::QemuServer::check_lock($conf);
+
+	    if($delete){
+
+		PVE::QemuServer::template_delete($vmid, $conf, $snapname);
+
+		if($snapname){
+		    die "snapshot '$snapname' don't exist\n" if !defined($conf->{snapshots}->{$snapname});
+		    delete $conf->{snapshots}->{$snapname}->{template};
+		}else{
+		    delete $conf->{template};
+		}
+
+	    }else{
+
+		PVE::QemuServer::template_create($vmid, $conf, $snapname);
+
+		if($snapname){
+		    die "snapshot '$snapname' don't exist\n" if !defined($conf->{snapshots}->{$snapname});
+		    $conf->{snapshots}->{$snapname}->{template} = 1;
+		}else{
+		    $conf->{template} = 1;
+		}
+	    }
+
+	    PVE::QemuServer::update_config_nolock($vmid, $conf, 1);
+	};
+
+	PVE::QemuServer::lock_config($vmid, $updatefn);
+	return undef;
+    }});
+
+
+
 1;
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index a34c89f..1e70c3a 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -181,6 +181,12 @@ my $confdesc = {
 	description => "Lock/unlock the VM.",
 	enum => [qw(migrate backup snapshot rollback)],
     },
+    template => {
+	optional => 1,
+	type => 'boolean',
+	description => "Current config or snapshot is a template",
+	default => 0,
+    },
     cpulimit => {
 	optional => 1,
 	type => 'integer',
@@ -4411,4 +4417,76 @@ sub has_feature{
 
     return 1 if !$err;
 }
+
+sub template_create {
+    my ($vmid, $conf, $snapname) = @_;
+
+    die "snapshot $snapname don't exist" if ($snapname && (!defined($conf->{snapshots}->{$snapname})));
+
+    die "you can't create a template without snapshot on a running vm" if check_running($vmid) && !$snapname;
+
+    die "you can't create a template from a snapshot with a vmstate" if $snapname && $conf->{snapshots}->{$snapname}->{vmstate};
+
+    $conf = $conf->{snapshots}->{$snapname} if $snapname;
+
+    my $storecfg = PVE::Storage::config();
+
+    foreach_drive($conf, sub {
+	my ($ds, $drive) = @_;
+
+	return if drive_is_cdrom($drive);
+
+	my $volid = $drive->{file};
+	my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
+	if ($storeid) {
+	     my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
+	     PVE::Storage::volume_protect($storecfg, $volid, $snapname, 1);
+	}
+    });
+
+}
+
+sub template_delete {
+    my ($vmid, $conf, $snapname) = @_;
+
+    $conf = $conf->{snapshots}->{$snapname} if $snapname;
+    my $storecfg = PVE::Storage::config();
+
+    #search if clone child of template disks exist
+    foreach_drive($conf, sub {
+	my ($ds, $drive) = @_;
+
+	return if drive_is_cdrom($drive);
+
+	my $volid = $drive->{file};
+	my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
+	$volname .= "@".$snapname if $snapname;
+
+	if ($storeid) {
+	    my $dl = PVE::Storage::vdisk_list($storecfg, $storeid, undef);
+	    PVE::Storage::foreach_volid($dl, sub {
+		my ($volumeid, undef, $info) = @_;
+		if($info->{parent} && $info->{parent} eq $volname) {
+		    die "You can't delete this template. $volumeid is a clone of this template";
+		}
+	    });
+	}
+    });
+
+    #unprotect the parent file or parent snapshot
+    foreach_drive($conf, sub {
+	my ($ds, $drive) = @_;
+
+	return if drive_is_cdrom($drive);
+
+	my $volid = $drive->{file};
+	my ($storeid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
+	if ($storeid) {
+	    my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
+	    PVE::Storage::volume_protect($storecfg, $volid, $snapname);
+	}
+    });
+
+}
+
 1;
diff --git a/qm b/qm
index 76bc229..93f621c 100755
--- a/qm
+++ b/qm
@@ -379,6 +379,8 @@ my $cmddef = {
 
     rollback => [ "PVE::API2::Qemu", 'rollback', ['vmid', 'snapname'], { node => $nodename } , $upid_exit ],
 
+    template => [ "PVE::API2::Qemu", 'template', ['vmid'], { node => $nodename }],
+
     start => [ "PVE::API2::Qemu", 'vm_start', ['vmid'], { node => $nodename } , $upid_exit ],
 
     stop => [ "PVE::API2::Qemu", 'vm_stop', ['vmid'], { node => $nodename }, $upid_exit ],
-- 
1.7.10.4