diff --git a/src/backend/BSRepServer/BuildInfo.pm b/src/backend/BSRepServer/BuildInfo.pm
index b90a444d588..61da9369713 100644
--- a/src/backend/BSRepServer/BuildInfo.pm
+++ b/src/backend/BSRepServer/BuildInfo.pm
@@ -35,6 +35,9 @@ sub new {
 
   $self->{ctx} = $ctx;
   $ctx->{'dobuildinfo'} = 1 unless $opts{'internal'};
+  $ctx->{'extradeps'} = $opts{'add'} if $opts{'add'};
+  my $debugoutput = '';
+  $ctx->{'expanddebug'} = \$debugoutput if $opts{'debug'};
 
   bless($self, $class);
 
@@ -143,6 +146,7 @@ sub fixupbuildinfo {
   $binfo->{'debuginfo'} ||= 0;	# XXX: why?
   my %preimghdrmd5s = map {delete($_->{'preimghdrmd5'}) => 1} grep {$_->{'preimghdrmd5'}} @{$binfo->{'bdep'}};
   addpreinstallimg($ctx, $binfo, \%preimghdrmd5s);
+  $binfo->{'expanddebug'} = ${$ctx->{'expanddebug'}} if $ctx->{'expanddebug'};
 }
 
 sub getbuildinfo {
diff --git a/src/backend/BSRepServer/Checker.pm b/src/backend/BSRepServer/Checker.pm
index 1af540a07fd..c54df4beec5 100644
--- a/src/backend/BSRepServer/Checker.pm
+++ b/src/backend/BSRepServer/Checker.pm
@@ -22,6 +22,7 @@ use Build;
 
 use strict;
 
+use BSSched::BuildJob;
 use BSSched::BuildJob::Package;
 use BSSched::BuildJob::KiwiImage;
 use BSSched::BuildJob::KiwiProduct;
@@ -112,7 +113,11 @@ sub preparepool {
 # see checkpks in BSSched::Checker
 sub buildinfo {
   my ($ctx, $packid, $pdata, $info) = @_;
+
+  my $expanddebug = $ctx->{'expanddebug'};
+  local $Build::expand_dbg = 1 if $expanddebug;
   my $xp = BSSolv::expander->new($ctx->{'pool'}, $ctx->{'conf'});
+  $ctx->{'expander'} = $xp;
   no warnings 'redefine';
   local *Build::expand = sub { $_[0] = $xp; goto &BSSolv::expander::expand; };
   use warnings 'redefine';
@@ -125,6 +130,7 @@ sub buildinfo {
   die("$pdata->{'error'}\n") if $pdata->{'error'};
   die("$info->{'error'}\n") if $info->{'error'};
   my ($eok, @edeps) = $handler->expand($bconf, $ctx->{'subpacks'}->{$info->{'name'}}, @{$info->{'dep'} || []});
+  BSSched::BuildJob::add_expanddebug($ctx, 'meta deps expansion') if $expanddebug;
   die("unresolvable: ".join(", ", @edeps)."\n") unless $eok;
   $info->{'edeps'} = \@edeps;
   my ($status, $error) = $handler->check($ctx, $packid, $pdata, $info, $bconf->{'type'});
diff --git a/src/backend/BSSched/BuildJob.pm b/src/backend/BSSched/BuildJob.pm
index 3d4a23e6cd2..8ba2b5d3123 100644
--- a/src/backend/BSSched/BuildJob.pm
+++ b/src/backend/BSSched/BuildJob.pm
@@ -788,6 +788,31 @@ sub create_jobdata {
   return $binfo;
 }
 
+=head2 add_expanddebug - add debug data from the expander
+
+ input:  $ctx           - prp context
+         $type          - expandsion type information 
+         $xp            - expander (optional)
+
+=cut
+
+sub add_expanddebug {
+  my ($ctx, $type, $xp) = @_;
+  my $expanddebug = $ctx->{'expanddebug'};
+  return unless ref($expanddebug);
+  $xp ||= $ctx->{'expander'};
+  return unless $xp;
+  return unless defined &BSSolv::expander::debugstr;
+  my $dbg = $xp->debugstr();
+  return unless $dbg;
+  $dbg = substr($dbg, $ctx->{"xp_cut_hack$xp"}) if $ctx->{"xp_cut_hack$xp"};
+  return unless $dbg;
+  $$expanddebug .= "\n" if $$expanddebug;
+  $$expanddebug .= "=== $type\n";
+  $$expanddebug .= $dbg;
+  $dbg = $xp->debugstr();
+  $ctx->{"xp_cut_hack$xp"} = length($dbg) if $dbg;	# sigh
+}
 
 =head2 create - create a new build job
 
@@ -840,8 +865,6 @@ sub create {
 
   # a new one. expand usedforbuild. write info file.
   my $buildtype = $pdata->{'buildtype'} || Build::recipe2buildtype($info->{'file'});
-  my $kiwitype = '';
-  $kiwitype = $info->{'imagetype'} && $info->{'imagetype'}->[0] eq 'product' ? 'product' : 'image' if $buildtype eq 'kiwi';
 
   my $syspath;
   my $searchpath = path2buildinfopath($gctx, $ctx->{'prpsearchpath'});
@@ -852,24 +875,31 @@ sub create {
   }
 
   # calculate sysdeps (cannot cache in the kiwi case)
+  my $expanddebug = $ctx->{'expanddebug'};
+
   my @sysdeps;
   if ($buildtype eq 'kiwi') {
-    @sysdeps = Build::get_sysbuild($bconf, "kiwi-$kiwitype", [ grep {/^kiwi-.*:/} @{$info->{'dep'} || []} ]);
+    my $kiwitype = '';
+    $kiwitype = $info->{'imagetype'} && $info->{'imagetype'}->[0] eq 'product' ? 'kiwi-product' : 'kiwi-image';
+    @sysdeps = grep {/^kiwi-.*:/} @{$info->{'dep'} || []};
+    @sysdeps = Build::get_sysbuild($bconf, $kiwitype, [ @sysdeps,  @{$ctx->{'extradeps'} || []} ]);
   } else {
     $ctx->{"sysbuild_$buildtype"} ||= [ Build::get_sysbuild($bconf, $buildtype) ];
     @sysdeps = @{$ctx->{"sysbuild_$buildtype"}};
   }
+  add_expanddebug($ctx,'sysdeps expansion') if $expanddebug && @sysdeps;
 
   # calculate packages needed for building
   my @bdeps = grep {!/^\// || $bconf->{'fileprovides'}->{$_}} @{$info->{'prereq'} || []};
   unshift @bdeps, '--directdepsend--' if @bdeps;
-  unshift @bdeps, @{$info->{'dep'} || []};
+  unshift @bdeps, @{$info->{'dep'} || []}, @{$ctx->{'extradeps'} || []};
   push @bdeps, '--ignoreignore--' if @sysdeps;
 
   if ($buildtype eq 'kiwi' || $buildtype eq 'buildenv') {
     @bdeps = (1, @$edeps);      # reuse edeps packages, no need to expand again
   } else {
     @bdeps = Build::get_build($bconf, $subpacks, @bdeps);
+    add_expanddebug($ctx, 'build expansion') if $expanddebug;
   }
   if (!shift(@bdeps)) {
     if ($ctx->{'verbose'}) {
diff --git a/src/backend/BSSched/BuildJob/KiwiImage.pm b/src/backend/BSSched/BuildJob/KiwiImage.pm
index 31fe93e3e46..862b64edfa2 100644
--- a/src/backend/BSSched/BuildJob/KiwiImage.pm
+++ b/src/backend/BSSched/BuildJob/KiwiImage.pm
@@ -132,11 +132,14 @@ sub check {
   delete $bconf->{'ignoreh'};
 
   my @deps = @{$info->{'dep'} || []};
+  my $expanddebug = $ctx->{'expanddebug'};
+  local $Build::expand_dbg = 1 if $expanddebug;
   my $xp = BSSolv::expander->new($pool, $bconf);
   no warnings 'redefine';
   local *Build::expand = sub { $_[0] = $xp; goto &BSSolv::expander::expand; };
   use warnings 'redefine';
   my ($eok, @edeps) = Build::get_build($bconf, [], @deps, '--ignoreignore--');
+  BSSched::BuildJob::add_expanddebug($ctx, 'kiwi image expansion', $xp) if $expanddebug;
   if (!$eok) {
     if ($ctx->{'verbose'}) {
       print "      - $packid (kiwi-image)\n";
@@ -223,7 +226,7 @@ sub build {
     no warnings 'redefine';
     local *Build::expand = sub { $_[0] = $xp; goto &BSSolv::expander::expand; };
     use warnings 'redefine';
-    my $nctx = bless { %$ctx, 'conf' => $bconf, 'prpsearchpath' => [], 'pool' => $epool, 'dep2pkg' => $edep2pkg, 'realctx' => $ctx}, ref($ctx);
+    my $nctx = bless { %$ctx, 'conf' => $bconf, 'prpsearchpath' => [], 'pool' => $epool, 'dep2pkg' => $edep2pkg, 'realctx' => $ctx, 'expander' => $xp}, ref($ctx);
     return BSSched::BuildJob::create($nctx, $packid, $pdata, $info, [], $edeps, $reason, 0);
   }
   if ($ctx->{'dobuildinfo'}) {
diff --git a/src/backend/BSSched/BuildJob/KiwiProduct.pm b/src/backend/BSSched/BuildJob/KiwiProduct.pm
index e0ae060d407..07fc794a4e1 100644
--- a/src/backend/BSSched/BuildJob/KiwiProduct.pm
+++ b/src/backend/BSSched/BuildJob/KiwiProduct.pm
@@ -183,6 +183,7 @@ sub check {
     use warnings 'redefine';
     my ($eok, @kdeps) = Build::get_sysbuild($bconf, 'kiwi-product', [ grep {/^kiwi-.*:/} @{$info->{'dep'} || []} ]);
     if (!$eok) {
+      BSSched::BuildJob::add_expanddebug($ctx, 'kiwi sysdeps expansion', $xp) if $ctx->{'expanddebug'};
       if ($ctx->{'verbose'}) {
         print "      - $packid (kiwi-product)\n";
         print "        unresolvable for sysbuild:\n";
@@ -457,11 +458,7 @@ sub build {
   my $remoteprojs = $gctx->{'remoteprojs'};
   my $gdst = $ctx->{'gdst'};
 
-  my $bconf = $data->[0];
-  my $rpms = $data->[1];
-  my $pool = $data->[2];
-  my $dep2pkg = $data->[3];
-  my $reason = $data->[4];
+  my ($bconf, $rpms, $pool, $dep2pkg, $reason) = @$data;
   my $prp = "$projid/$repoid";
 
   my $dobuildinfo = $ctx->{'dobuildinfo'};
@@ -508,7 +505,7 @@ sub build {
   local *Build::expand = sub { $_[0] = $xp; goto &BSSolv::expander::expand; };
   use warnings 'redefine';
 
-  my $nctx = bless { %$ctx, 'prpsearchpath' => $prpsearchpath, 'conf' => $bconf, 'pool' => $pool, 'dep2pkg' => $dep2pkg, 'extrabdeps' => \@bdeps, 'realctx' => $ctx}, ref($ctx);
+  my $nctx = bless { %$ctx, 'prpsearchpath' => $prpsearchpath, 'conf' => $bconf, 'pool' => $pool, 'dep2pkg' => $dep2pkg, 'extrabdeps' => \@bdeps, 'realctx' => $ctx, 'expander' => $xp}, ref($ctx);
   return BSSched::BuildJob::create($nctx, $packid, $pdata, $info, [], [], $reason, 0);
 }
 
diff --git a/src/backend/BSSched/BuildRepo.pm b/src/backend/BSSched/BuildRepo.pm
index 4956eb30841..a7680324d23 100644
--- a/src/backend/BSSched/BuildRepo.pm
+++ b/src/backend/BSSched/BuildRepo.pm
@@ -298,7 +298,7 @@ sub fctx_gbininfo2full {
         my $or = $full{$r->{'name'}};
         $full{$r->{'name'}} = $r if $or && $or->{'packid'} eq '_volatile' && volatile_cmp($r, $or);
       }
-      $full{$r->{'name'}} ||= $r;
+      $full{$r->{'name'}} ||= $r;		# first one wins
     }
   }
   delete $gbininfo->{$oldpackid} if defined($oldpackid) && !$hadoldpackid;