#!/bin/bash

# dist.sh

# Author: Tom "spot" Callaway <tcallawa@redhat.com>

# License: GPL

# This is a script to output the value for the %{dist}

# tag. The dist tag takes the following format: .$type$num

# Where $type is one of: el, fc, rh

# (for RHEL, Fedora Core, and RHL, respectively)

# And $num is the version number of the distribution.

# NOTE: We can't detect Rawhide or Fedora Test builds properly.

# If we successfully detect the version number, we output the

# dist tag. Otherwise, we exit with no output.

RELEASEFILE=/etc/redhat-release

function check_num {

    MAINVER=`cut -d "(" -f 1 < $RELEASEFILE | \

	sed -e "s/[^0-9.]//g" -e "s/$//g" | cut -d "." -f 1`

    echo $MAINVER | grep -q '[0-9]' && echo $MAINVER

}

function check_rhl {

    grep -q "Red Hat Linux" $RELEASEFILE && ! grep -q "Advanced" $RELEASEFILE && echo $DISTNUM

}

function check_rhel {

    egrep -q "(Enterprise|Advanced)" $RELEASEFILE && echo $DISTNUM

}

function check_fedora {

    grep -q Fedora $RELEASEFILE && echo $DISTNUM

}

DISTNUM=`check_num`

DISTFC=`check_fedora`

DISTRHL=`check_rhl`

DISTRHEL=`check_rhel`

if [ -n "$DISTNUM" ]; then

    if [ -n "$DISTFC" ]; then

	DISTTYPE=fc

    elif [ -n "$DISTRHEL" ]; then

	DISTTYPE=el

    elif [ -n "$DISTRHL" ]; then

	DISTTYPE=rhl

    fi

fi

[ -n "$DISTTYPE" -a -n "$DISTNUM" ] && DISTTAG=".${DISTTYPE}${DISTNUM}"

case "$1" in

    --el) echo -n "$DISTRHEL" ;;

    --fc) echo -n "$DISTFC" ;;

    --rhl) echo -n "$DISTRHL" ;;

    --distnum) echo -n "$DISTNUM" ;;

    --disttype) echo -n "$DISTTYPE" ;;

    --help)

	printf "Usage: $0 [OPTIONS]\n"

	printf " Default mode is --dist. Possible options:\n"

	printf " --el\t\tfor RHEL version (if RHEL)\n"

	printf " --fc\t\tfor Fedora version (if Fedora)\n"

	printf " --rhl\t\tfor RHL version (if RHL)\n"

	printf " --dist\t\tfor distribution tag\n"

	printf " --distnum\tfor distribution number (major)\n"

	printf " --disttype\tfor distribution type\n" ;;

    *) echo -n "$DISTTAG" ;;

esac