- be more verbose when the preinstallimage unpack fails

init_buildsystem

@@ -171,10 +171,12 @@ preinstall_image()
 	TAR="tar -x"
     fi
     # pipe output through perl to print a dot every 1000 lines
-    if ! $TAR -z --exclude .build --exclude .init_b_cache -f "$BUILD_ROOT/.init_b_cache/rpms/$1" -v > >(perl -e '$|=1; my $done=0; $done++ % 1000 or print "." while <STDIN>; print "\n";')  2>&1 ; then
+    if ! $TAR -z --exclude .build --exclude .init_b_cache -f "$BUILD_ROOT/.init_b_cache/rpms/$1" -v > >(tee "$BUILD_ROOT/.preinstallimage.unpack" | perl -e '$|=1; my $done=0; $done++ % 1000 or print "." while <STDIN>; print "\n";')  2>&1 ; then
 	echo "unpack failed."
+	test -e "$BUILD_ROOT/.preinstallimage.unpack" && cat "$BUILD_ROOT/.preinstallimage.unpack"
 	cleanup_and_exit 1
     fi
+    rm -f "$BUILD_ROOT/.preinstallimage.unpack"
 }
 
 preinstall()