Merged from trunk 7534:7550

   Merged from trunk 7534:7550

   +------------------------------------------------------------------------+
   | 7535    | For bug #187375, handle an ImportError when portage is       |
   | zmedico | downgraded to a version without mod_echo.                    |
   |---------+--------------------------------------------------------------|
   | 7537    | Like older versions of portage, don't show the repo display  |
   | zmedico | if [0] is all that will be shown.                            |
   |---------+--------------------------------------------------------------|
   | 7541    | For bug #187480, fix writemsg args in portdbapi.gvisible().  |
   | zmedico |                                                              |
   |---------+--------------------------------------------------------------|
   | 7544    | For bug #187518, handle EISDIR thrown from mkdir when the    |
   | zmedico | directory already exists on FreeBSD.                         |
   |---------+--------------------------------------------------------------|
   | 7547    | s/portage.eclass_cache/eclass_cache/ since eclass_cache is   |
   | zmedico | actually a local variable here.                              |
   |---------+--------------------------------------------------------------|
   | 7548    | In portage.spawn() logging, put the read end of the pipe in  |
   | zmedico | O_NONBLOCK mode just once at the beginning. This avoids      |
   |         | unnecessary fcntl calls and removes one more opportunity to  |
   |         | trigger EAGAIN errors on FreeBSD.                            |
   |---------+--------------------------------------------------------------|
   | 7550    | Generate a QA Notice and cd to ${WORKDIR} if the ${S}        |
   | zmedico | directory does not exist.                                    |
   +------------------------------------------------------------------------+

svn path=/main/branches/prefix/; revision=7551