builder: do not emerge preserved rebuild if PRETEND is set

This reverts commit 575ec04147.

builder

@@ -40,6 +40,7 @@ my $remote_overlay            = $ENV{REMOTE_OVERLAY};
 my $qualityassurance_checks   = $ENV{QA_CHECKS} // 0;
 my $remote_conf_portdir       = $ENV{REMOTE_CONF_PORTDIR};
 my $remote_portdir            = $ENV{REMOTE_PORTDIR};
+my $pretend                   = $ENV{PRETEND} // 0;
 
 my $make_conf = $ENV{MAKE_CONF};
 
@@ -523,7 +524,8 @@ if ($use_equo) {
         safe_call("equo i $equo_install_args --bdeps $_")
             for ( @packages_deps, @equo_install )
             ; ## bail out here, if installs fails. emerge will compile a LOT of stuff
-        if ( @equo_remove > 0 ) {
+        if ( @equo_remove > 0 and !$pretend) {
+            say "Removing with equo: @equo_remove";
             system("equo rm --nodeps $_") for (@equo_remove);
         }
     }
@@ -548,12 +550,19 @@ if ( $qualityassurance_checks == 1 ) {
 
 say "*** Ready to compile, finger crossed ***";
 
+if($pretend){
+  say "----> PRETEND mode <----";
+  $equo_install_args.=" -p";
+  $emerge_defaults_args.=" -p"
+}
+
 system("emerge --info")
     ; #always give detailed information about the building environment, helpful to debug
 
 my $rt;
 
-if ( $emerge_remove and $emerge_remove ne "" ) {
+if ( $emerge_remove and $emerge_remove ne "" and !$pretend) {
+    say "Removing with emerge: $emerge_remove";
     system("emerge -C $_") for split( / /, $emerge_remove );
 }
 
@@ -570,7 +579,7 @@ my $return = $rt >> 8;
 # best effort -B
 compile_packs( "injected_targets", @injected_packages );
 
-if ($preserved_rebuild) {
+if ($preserved_rebuild and !$pretend) {
 
     system("emerge -j $jobs --buildpkg \@preserved-rebuild");
     system("revdep-rebuild");

sabayon-buildpackages

@@ -56,6 +56,7 @@ docker_volumes=( -v "$OUTPUT_DIR:/usr/portage/packages" )
 [ -z "$REMOTE_CONF_PORTDIR" ] || docker_env+=(-e "REMOTE_CONF_PORTDIR=$REMOTE_CONF_PORTDIR")
 [ -z "$REMOTE_PORTDIR" ] || docker_env+=(-e "REMOTE_PORTDIR=$REMOTE_PORTDIR")
 [ -z "$ETP_NOCACHE" ] || docker_env+=(-e "ETP_NOCACHE=$ETP_NOCACHE")
+[ -z "$PRETEND" ] || docker_env+=(-e "PRETEND=$PRETEND")
 [ -d "$LOCAL_OVERLAY" ] && docker_volumes+=(-v "$LOCAL_OVERLAY:/usr/local/local_portage")
 
 if [ -e $MAKE_CONF ]; then