GentooLinux < CF

CF Web>Linux>GentooLinux (2013-02-22, DrewPilcher) (raw view)

Things not to do:
   * put =hardened= in =USE= in =/etc/make.conf=. It breaks X right now.
      * http://bugs.gentoo.org/show_bug.cgi?id=43177
      * Or, should X decide to work, it still seems to cause breakage with =dev-java/sun-j2sdk=
   * put =amd= in =USE= flags if you're using =net-fs/shfs= and =sys-kernel/linux26-headers=. For some reason, there's great wonderful breakage with =net-fs/am-utils=.

Things that can be useful:
   * put =buildpkg= in =FEATURES= in =/etc/make.conf=. Takes a bit more space and time, but means you can easily re-add a package that accidently gets removed.
   * http://www.gentoo-wiki.com (and particularly http://www.gentoo-wiki.com/TIP_Index)
   * http://www.gentoo-portage.com
   * =app-portage/gentoolkit= has a bunch of really useful commands
      * =dep-clean= - Shows unrequired packages and missing dependencies
      * =equery= - Package Query Tool
      * =etcat= - Portage Information Extractor
      * =euse= - command line USE flag editor
      * =glsa-check= - check system for possible security problems
      * =qpkg= - query package tool
      * =revdep-rebuild= - Reverse dependency rebuilder
   * =app-portage/esearch= provides a speedy replacement for =emerge search= but =/usr/sbin/eupdatedb= has to be run for it to work. And it's not automatically run. And it takes a couple minutes. But it's fast once it's built.
   * use =dispatch-conf= instead of =etc-update=
   * Update steps
      1 emerge sync
      1 emerge -uDav world
      1 emerge -av depclean
      1 revdep-rebuild -pv
      1 revdep-rebuild -v
      1 dispatch-conf
   * =USE= flags are only so useful. Set up =/etc/portage/package.use= for per-package flags and overrides. Like djbdns's ipv6 patches not playing nice with other patches. More details at http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=2&chap=1
   * =dev-python/psyco= does some sort of jit thing for python. There's no good way to add it permanently to scripts, since it's lost each time the script is re-emerged. But in the meantime, you can edit files like =/usr/bin/emerge= and add the lines below. See http://forums.gentoo.org/viewtopic.php?t=153921&highlight=psyco for some details.
<verbatim>
         try: import psyco; psyco.full();
         except ImportError: pass
</verbatim>


Rumoured useful things that haven't been checked out yet
   * Putting =dev-java/sun-j2sdk= and =dev-java/sun-j2sdk-1.4.2= into =/var/cache/edb/world= will allow the latest version of =sun-j2sdk= to be installed, but will keep version 1.4.2 installed also. Of course, this only works with packages that don't need to live in the same place, and =sun-j2sdk= is a good example of that.
   * This seems to work. But the goo in =/usr/portage/eclass/java.eclass= for testing whether or not there's a JVM set up has been flakey as hell. It might work properly now, but I still don't test it.


Problems that haven't been correctly solved:

Problems that were solved:
   * ntpd was failing to drop root privileges. Make sure the modules =capabilities= is loaded.

Problems that have gone away:
   * using =sys-kernel/linux26-headers= causes breaking with =net-misc/iputils= and I don't know why I'm the only one finding it. Or maybe I'm not, but it's not obviously reported anywhere. One workaround is editing the ebuild for =iputils= and commenting out the sed lines for a makefile change on the includes.
<verbatim>
       sed -i \
               -e "s:/usr/src/linux/include:${ROOT}/usr/include:" \
               Makefile libipsec/Makefile setkey/Makefile \
               || die "sed /usr/include failed"
</verbatim>
   * But this is stupid. And goes away each time you =emerge sync= unless you set up an overlay directory, and then you don't get the updates.
   * if /etc and /tmp are on separate partitions (e.g., /tmp is a tmpfs) dispatch-conf breaks.
     http://bugs.gentoo.org/show_bug.cgi?id=62534

Topic revision: r10 - 2013-02-22 - DrewPilcher

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