Gratuitous Code Post

Posted on Tue 24 May 2005 by alex in geek

I got home today and had a sudden urge to run. I think this is because I've been cooped up in an office all day and needed some physical exertion. I didn't run far, but I did run hard (so to speak).

I think it cleared my mind enough that I could face adding the following code to my .bashrc
to make working with gentoo overlays a little easier. Basically it allows me to hack around with ebuilds without doing my editing as root.

#
# Gentoo Related Macros
#
# These are various tools for manipulating a local
# portage structure (which can be part of an overlay)
#
# These functions allow you to list, clone, delete and diff ebuilds
#

LOCAL_PORTAGE=$HOME/portage
MASTER_PORTAGE=/usr/portage

alias ls_le="find $LOCAL_PORTAGE -xtype d -mindepth 2 -maxdepth 2 | sed s#$LOCAL_PORTAGE##"
alias ls_me="find $MASTER_PORTAGE -xtype d -mindepth 2 -maxdepth 2 | sed s#$MASTER_PORTAGE##"

#
# guess_ebuild
#
# Take a string, possibly partial and match it a proper group/ebuild
#
function guess_ebuild()
{
    tmp=`ls_me | grep $1`
    group=`echo $tmp | perl -ne 'm#/([^/]*)#; print "$1"'`
    ebuild=`echo $tmp | perl -ne 'm#/([^/]*)/(\w*)#; print "$2"'`
}


#
# diff ebuild
#
# Do a diff for a given ebuild
#
function diff_ebuild()
{
    result=0

    if [ "$1" ]
    then
    guess_ebuild $1
    if [[ "$group" && "$ebuild" ]]
    then
        diff -ub $MASTER_PORTAGE/$group/$ebuild $LOCAL_PORTAGE/$group/$ebuild
    fi
    else
    for ebuild in `ls_le`
    do
      diff -ub $MASTER_PORTAGE/$ebuild $LOCAL_PORTAGE/$ebuild
    done
    fi
}

#
# Clone an ebuild from the master tree into the local tree
#
#
function clone_ebuild()
{
    if [ "$1" ]
    then
    guess_ebuild $1
    if [[ "$group" && "$ebuild" ]]
    then
        echo "Cloning ebuild $group/$ebuild"
        mkdir -p $LOCAL_PORTAGE/$group
        cp -aP $MASTER_PORTAGE/$group/$ebuild $LOCAL_PORTAGE/$group/
    else
        echo "$1 not in  Master Portage"
    fi
    else
        echo "No ebuild specified"
    fi
}


#
# Clean ebuilds
#
# Delete untouched ebuilds from local portage
#
function clean_ebuilds()
{
    for ebuild in `ls_le`
    do
      result=`diff -br --brief $MASTER_PORTAGE/$ebuild $LOCAL_PORTAGE/$ebuild`
      if [ "x$result" == "x" ]
      then
      echo "Removing local copy of $ebuild"
      rm -rf $LOCAL_PORTAGE/$ebuild
      fi
    done
}

gentoo