[PATCH container] fix #7164: lxc: restore: apply password and ssh keys during container restore

[Elias Huhsovitz <e.huhsovitz@proxmox.com>]

When restoring a container with `pct restore`, the `--password` and
`--ssh-public-keys` options are silently ignored. The `create_vm` API
endpoint only invokes the `post_create_hook` during initial container
creation, skipping it entirely for restores.

To resolve this, make the credential updates in
`PVE::LXC::Setup::Base::post_create_hook` conditional. The
hook now applies the password or SSH keys only if they are explicitly
defined.

Invoke the hook for create/restore.

Signed-off-by: Elias Huhsovitz <e.huhsovitz@proxmox.com>
---
 src/PVE/API2/LXC.pm       | 5 ++---
 src/PVE/LXC/Setup/Base.pm | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/PVE/API2/LXC.pm b/src/PVE/API2/LXC.pm
index 88067dd..8e6e7e8 100644
--- a/src/PVE/API2/LXC.pm
+++ b/src/PVE/API2/LXC.pm
@@ -570,6 +570,7 @@ __PACKAGE__->register_method({
                         );
                     }
 
+                    my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir);
                     if ($restore) {
                         print "merging backed-up and given configuration..\n";
                         PVE::LXC::Create::restore_configuration(
@@ -583,13 +584,11 @@ __PACKAGE__->register_method({
                             $skip_fw_config_restore,
                         );
                         PVE::LXC::create_ifaces_ipams_ips($conf, $vmid) if $unique;
-                        my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir);
                         $lxc_setup->template_fixup($conf);
                     } else {
-                        my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir); # detect OS
                         PVE::LXC::Config->write_config($vmid, $conf); # safe config (after OS detection)
-                        $lxc_setup->post_create_hook($password, $ssh_keys);
                     }
+                    $lxc_setup->post_create_hook($password, $ssh_keys);
                 };
                 my $err = $@;
                 PVE::LXC::umount_all($vmid, $storage_cfg, $conf, $err ? 1 : 0);
diff --git a/src/PVE/LXC/Setup/Base.pm b/src/PVE/LXC/Setup/Base.pm
index 567f9d6..13dd6b9 100644
--- a/src/PVE/LXC/Setup/Base.pm
+++ b/src/PVE/LXC/Setup/Base.pm
@@ -724,7 +724,7 @@ sub post_create_hook {
 
     &$randomize_crontab($self, $conf);
 
-    $self->set_user_password($conf, 'root', $root_password);
+    $self->set_user_password($conf, 'root', $root_password) if defined($root_password);
     $self->set_user_authorized_ssh_keys($conf, 'root', $ssh_keys) if $ssh_keys;
     $self->setup_init($conf);
     $self->setup_network($conf);
-- 
2.47.3