From b2fcf5405f49f9c5d4218fd10cd83056f41234ff Mon Sep 17 00:00:00 2001
From: upstream <upstream@localhost>
Date: Sat, 3 Oct 2026 01:40:02 +0200
Subject: [PATCH] Upstream proxmox-git/qemu-server state of the touched files
 before 7e62afd562

---
 src/PVE/QemuServer.pm                     |  2 -
 src/test/run_qemu_restore_config_tests.pl | 81 +++++++++++++++++++++++
 2 files changed, 81 insertions(+), 2 deletions(-)
 create mode 100644 src/test/run_qemu_restore_config_tests.pl

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index 3b9a86a..f199371 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -2167,8 +2167,6 @@ sub write_vm_config {
 
         foreach my $key (sort keys %$conf) {
             next if $key =~ /^(digest|description|pending|snapshots|special-sections)$/;
-            # an empty tag list is only needed as pending change for removing all tags
-            next if $key eq 'tags' && !$pending && $conf->{$key} =~ m/^\s*$/;
             $raw .= "$key: $conf->{$key}\n";
         }
         return $raw;
diff --git a/src/test/run_qemu_restore_config_tests.pl b/src/test/run_qemu_restore_config_tests.pl
new file mode 100644
index 0000000..4d5ebb5
--- /dev/null
+++ b/src/test/run_qemu_restore_config_tests.pl
@@ -0,0 +1,81 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use lib qw(..);
+
+use Test::MockModule;
+use Test::More;
+
+use File::Basename;
+
+use PVE::QemuServer;
+use PVE::Tools qw(dir_glob_foreach file_get_contents);
+
+my $INPUT_DIR = './restore-config-input';
+my $EXPECTED_DIR = './restore-config-expected';
+
+# NOTE update when you add/remove tests
+plan tests => 4;
+
+my $pve_cluster_module = Test::MockModule->new("PVE::Cluster");
+$pve_cluster_module->mock(
+    cfs_read_file => sub {
+        my ($file) = @_;
+
+        if ($file eq 'datacenter.cfg') {
+            return {};
+        } else {
+            die "'cfs_read_file' called - missing mock?\n";
+        }
+    },
+);
+
+dir_glob_foreach(
+    './restore-config-input',
+    '[0-9]+.conf',
+    sub {
+        my ($file) = @_;
+
+        my $vmid = basename($file, ('.conf'));
+
+        my $fh = IO::File->new("${INPUT_DIR}/${file}", "r")
+            or die "unable to read '$file' - $!\n";
+
+        my $map = {};
+        my $disknum = 0;
+
+        # NOTE For now, the map is hardcoded to a file-based 'target' storage.
+        # In the future, the test could be extended to include parse_backup_hints
+        # and restore_allocate_devices. Even better if the config-related logic from
+        # the restore_XYZ_archive functions could become a separate function.
+        while (defined(my $line = <$fh>)) {
+            if ($line =~ m/^\#qmdump\#map:(\S+):(\S+):(\S*):(\S*):$/) {
+                my ($drive, undef, $storeid, $fmt) = ($1, $2, $3, $4);
+
+                $fmt ||= 'raw';
+
+                $map->{$drive} = "target:${vmid}/vm-${vmid}-disk-${disknum}.${fmt}";
+                $disknum++;
+            }
+        }
+
+        $fh->seek(0, 0) or die "seek failed - $!\n";
+
+        my $got = '';
+        my $cookie = { netcount => 0 };
+
+        while (defined(my $line = <$fh>)) {
+            $got .= PVE::QemuServer::restore_update_config_line(
+                $cookie, $map, $line, 0,
+            );
+        }
+
+        my $expected = file_get_contents("${EXPECTED_DIR}/${file}");
+
+        is_deeply($got, $expected, $file);
+    },
+);
+
+done_testing();