From c338043e44c14fc023e6386cf62c0acf97da51be Mon Sep 17 00:00:00 2001
From: Thierry Vignaud <thierry.vignaud@gmail.com>
Date: Sat, 5 Jun 2021 09:08:24 +0200
Subject: Convert from bdb backend to sqlite

Rationale:
- sqlite backend is supported since rpm-4.16
- bdb backend is deprecated in 4.16 & removed in 4.17 (really 4.16.90)
---
 Changes           |  2 ++
 urpm/main_loop.pm |  2 ++
 urpm/select.pm    | 21 +++++++++++++++++++++
 urpm/sys.pm       | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)

diff --git a/Changes b/Changes
index 2d2774f8..5b0cfe04 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,5 @@
+- Convert from bdb backend to sqlite when using rpm >= 4.16
+
 Version 8.125 - 17 February 2021
 
 - translation updates
diff --git a/urpm/main_loop.pm b/urpm/main_loop.pm
index cb8fc1f2..6e4820ab 100644
--- a/urpm/main_loop.pm
+++ b/urpm/main_loop.pm
@@ -497,6 +497,8 @@ sub run {
     my (@errors, @formatted_errors);
     $exit_code = 0;
 
+    urpm::select::migrate_forward_rpmdb_db_if_needed($urpm, $state);
+
     my $migrate_back_rpmdb_db_version = 
       $urpm->{root} && urpm::select::should_we_migrate_back_rpmdb_db_version($urpm, $state);
 
diff --git a/urpm/select.pm b/urpm/select.pm
index a015f7a5..dbde19a3 100644
--- a/urpm/select.pm
+++ b/urpm/select.pm
@@ -756,6 +756,27 @@ sub should_we_migrate_back_rpmdb_db_version {
     0;
 }
 
+sub migrate_forward_rpmdb_db_if_needed {
+    my ($urpm, $state) = @_;
+
+    my ($pkg) = selected_packages_providing($urpm, $state, 'rpm') or return;
+    my $rooted_rpm_version = version->new("v" . $pkg->version); # perl_checker: $self = revision
+    my $rpm_version = _rpm_version(); # perl_checker: $self = revision
+
+    if ($rpm_version ge v4.16.0) {
+	if ($rooted_rpm_version && $rooted_rpm_version ge v4.16) {
+	    $urpm->{debug} and $urpm->{debug}("chrooted db version used by librpm is at least as good as non-rooted one");
+	    if (-f "$urpm->{root}/var/lib/rpm/Packages") {
+		$urpm->{debug} and $urpm->{debug}("Migrating chrooted db");
+		$urpm->{need_migrate_rpmdb_now} = '4.16';
+		urpm::sys::migrate_forward_rpmdb_db_version($urpm, $urpm->{root});
+		return 1;
+	    }
+	}
+    }
+    0;
+}
+
 1;
 
 =back
diff --git a/urpm/sys.pm b/urpm/sys.pm
index b7cb1220..d8da722a 100644
--- a/urpm/sys.pm
+++ b/urpm/sys.pm
@@ -288,6 +288,39 @@ sub migrate_back_rpmdb_db_version {
     clean_rpmdb_shared_regions($root);
 }
 
+=item migrate_rpmdb_to_sqlite($urpm, $root)
+
+Migrate rpmdb to the new sqlite backend.
+
+=cut
+
+sub migrate_rpmdb_to_sqlite {
+    my ($urpm, $root) = @_;
+    $urpm->{info}("migrating db from bdb to sqlite (rpm >= 4.16)");
+    # Whatever is the default backend:
+    URPM::add_macro('_db_backend sqlite');
+    if (system('chroot', $root, 'rpm', '--rebuilddb') == 0) {
+	$urpm->{log}("rpm db converted to sqlite successfully");
+    } else {
+	$urpm->{error}("rpm db conversion failed. You will not be able to run rpm >= 4.17");
+    }
+}
+
+=item migrate_forward_rpmdb_db_version($urpm, $root)
+
+Check if we need to migrate rpmdb to a new backend prior to use it
+and do it if needed.
+
+=cut
+
+sub migrate_forward_rpmdb_db_version {
+    my ($urpm, $root) = @_;
+
+    if ($urpm->{need_migrate_rpmdb_now} eq '4.16') {
+	migrate_rpmdb_to_sqlite($urpm, $root);
+    }
+}
+
 
 =item apply_delta_rpm($deltarpm, $o_dir, $o_pkg)
 
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