From b1c7d97c84343398f39a1aa495e0516137227e2b Mon Sep 17 00:00:00 2001
From: Martin Whitaker <mageia@martin-whitaker.me.uk>
Date: Tue, 13 Nov 2018 20:34:00 +0000
Subject: Add option to suggest a downgrade command.

---
 qarepo.pl | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 56 insertions(+), 3 deletions(-)

diff --git a/qarepo.pl b/qarepo.pl
index fd6df5e..bc49731 100644
--- a/qarepo.pl
+++ b/qarepo.pl
@@ -116,6 +116,7 @@ my $button1 = Gtk3::Button->new('Quit');
 my $button2 = Gtk3::Button->new('Disable');
 my $button3 = Gtk3::Button->new('Enable');
 my $button4 = Gtk3::Button->new('Clear');
+my $button5 = Gtk3::Button->new('Downgrade');
 
 my $check0  = Gtk3::CheckButton->new_with_label("core");
 my $check1  = Gtk3::CheckButton->new_with_label("nonfree");
@@ -185,6 +186,8 @@ $button4->set_vexpand(TRUE);
 $button4->set_valign('GTK_ALIGN_END');
 $button4->signal_connect(clicked => \&clear);
 
+$button5->signal_connect(clicked => \&downgrade);
+
 $check0->set_active(TRUE);
 $check0->set_sensitive(FALSE);
 
@@ -213,9 +216,9 @@ $grid->attach($label3, 0, 2, 1, 1);
 $grid->attach($entry3, 1, 2, 4, 1);
 $grid->attach($entry4, 5, 2, 1, 1);
 $grid->attach($label5, 0, 3, 1, 1);
-$grid->attach($scroll, 1, 3, 5, 4);
-$grid->attach($label6, 0, 7, 1, 1);
-$grid->attach($status, 1, 7, 5, 1);
+$grid->attach($scroll, 1, 3, 5, 5);
+$grid->attach($label6, 0, 8, 1, 1);
+$grid->attach($status, 1, 8, 5, 1);
 
 $grid->attach($button1, 7, 0, 1, 1);
 $grid->attach($button2, 7, 2, 1, 1);
@@ -223,6 +226,7 @@ $grid->attach($button3, 7, 3, 1, 1);
 $grid->attach($check3,  7, 4, 1, 1);
 $grid->attach($check4,  7, 5, 1, 1);
 $grid->attach($button4, 7, 6, 1, 1);
+$grid->attach($button5, 7, 7, 1, 1);
 
 $window->add($grid);
 
@@ -343,6 +347,17 @@ sub clear {
     $entry5->get_buffer()->set_text('');
 }
 
+sub downgrade {
+    check_no_testing_media("This may stop some packages from being downgraded.")
+      or return;
+    disable_buttons();
+    if ($active_qa_repo) {
+        disable_repo();
+    }
+    downgrade_packages();
+    set_state('disabled');
+}
+
 sub dialogue_dismiss {
     if ($fatal_error) {
         Gtk3->main_quit();
@@ -389,6 +404,7 @@ sub set_state {
     $button2->set_sensitive($active_qa_repo);
     $button3->set_sensitive($state ne 'enabled');
     $button4->set_sensitive(TRUE);
+    $button5->set_sensitive($state ne 'changed');
     if ($state eq 'changed' || $state eq 'failed') {
         $button3->set_label('Update');
     } else {
@@ -401,6 +417,7 @@ sub disable_buttons {
     $button2->set_sensitive(FALSE);
     $button3->set_sensitive(FALSE);
     $button4->set_sensitive(FALSE);
+    $button5->set_sensitive(FALSE);
     gtk_update();
 }
 
@@ -663,6 +680,34 @@ sub sync_error {
     0;
 }
 
+sub downgrade_packages {
+    my $synthesis = "$qa_repo/$arch/media_info/synthesis.hdlist.cz";
+    if (! -e $synthesis) {
+        my $message = "no synthesis file found in local repository";
+        show_error_dialogue($message);
+        print_error($message);
+        return 0;
+    }
+
+    my @packages;
+    my $urpm = new URPM;
+    $urpm->parse_synthesis($synthesis);
+    $urpm->traverse(sub {
+        my ($pkg) = @_;
+        my $full_name = $pkg->fullname;
+        if (system("rpm --quiet -q $full_name") == 0) {
+            push @packages, $pkg->name();
+        }
+    });
+
+    if (@packages) {
+        @packages = sort @packages;
+        show_downgrade_dialogue("urpmi --update --downgrade @packages");
+    } else {
+        show_error_dialogue("none of the listed packages are installed");
+    }
+}
+
 sub trim {
     my ($text) = @_;
     $text =~ s/^\s+//;
@@ -679,6 +724,14 @@ sub wildcard_to_regexp {
     $pattern;
 }
 
+sub show_downgrade_dialogue {
+    $dialogue_window->set_title('Downgrade');
+    $dialogue_label->set_text('The following command may be used to downgrade the listed packages:');
+    $dialogue_text->get_buffer()->set_text(join("\n", @_));
+    $dialogue_text->set_wrap_mode('GTK_WRAP_WORD_CHAR');
+    $dialogue_window->show_all();
+}
+
 sub show_error_dialogue {
     $dialogue_window->set_title('Error');
     $dialogue_label->set_text('The following error(s) occurred:');
-- 
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