[pve-devel] [RFC container v2 22/25] backup: implement backup for external providers

[Fabian Grünbichler]

On August 13, 2024 3:28 pm, Fiona Ebner wrote:
> The filesystem structure is made available as a directory in a
> consistent manner (with details depending on the vzdump backup mode)
> just like for regular backup via tar.
> 
> The backup provider needs to back up the guest and firewall
> configuration and then the filesystem structure, honoring the ID maps
> (for unprivileged containers) as well as file exclusions and the
> bandwidth limit.
> 
> Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
> ---
> 
> Changes in v2:
> * Adapt to API changes.
> 
>  src/PVE/VZDump/LXC.pm | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/src/PVE/VZDump/LXC.pm b/src/PVE/VZDump/LXC.pm
> index 67d13db..0fc2a94 100644
> --- a/src/PVE/VZDump/LXC.pm
> +++ b/src/PVE/VZDump/LXC.pm
> @@ -373,7 +373,27 @@ sub archive {
>      my $userns_cmd = $task->{userns_cmd};
>      my $findexcl = $self->{vzdump}->{findexcl};
>  
> -    if ($self->{vzdump}->{opts}->{pbs}) {
> +    if (my $backup_provider = $self->{vzdump}->{'backup-provider'}) {
> +	$self->loginfo("starting external backup via " . $backup_provider->provider_name());
> +
> +	my ($mechanism) = $backup_provider->backup_get_mechanism($vmid, 'lxc');
> +	die "mechanism '$mechanism' requested by backup provider is not supported for containers\n"
> +	    if $mechanism ne 'directory';
> +
> +	my $config_file = "$tmpdir/etc/vzdump/pct.conf";
> +	my $firewall_file = "$tmpdir/etc/vzdump/pct.fw";
> +
> +
> +	my $conf = PVE::LXC::Config->load_config($vmid);
> +	my ($id_map, undef, undef) = PVE::LXC::parse_id_maps($conf);
> +	my $info = {
> +	    directory => $snapdir,
> +	    sources => [@sources],
> +	};
> +	$info->{'firewall-config'} = $firewall_file if -e $firewall_file;
> +	$info->{'bandwidth-limit'} = $opts->{bwlimit} * 1024 if $opts->{bwlimit};
> +	$backup_provider->backup_container($vmid, $config_file, $id_map, $findexcl, $info);

it might be easier to hide the idmapping from the backup provider? e.g.,
hand it a idmapped bindmount or something like that?

> +    } elsif ($self->{vzdump}->{opts}->{pbs}) {
>  
>  	my $param = [];
>  	push @$param, "pct.conf:$tmpdir/etc/vzdump/pct.conf";
> -- 
> 2.39.2
> 
> 
> 
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> 
>