File: which-pkg-manager

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#!/bin/sh
#
# Show which primary package manager is used in the system.
# Currently supported: dpkg, rpm, pacman
#
# Author:  Stefan Hundhammer <Stefan.Hundhammer@gmx.de>
# License: GPL V2
#

RPM=/bin/rpm
DPKG=/usr/bin/dpkg
PACMAN=/usr/bin/pacman


check_primary_rpm()
{
    test -x $RPM && $RPM -qf $RPM | sed -e 's/-.*//'
}


check_primary_dpkg()
{
    test -x $DPKG && $DPKG -S $DPKG | grep '^dpkg:' | sed -e 's/:.*//'
}


check_primary_pacman()
{
    test -x $PACMAN && $PACMAN -Qo $PACMAN | grep "is owned by pacman" | sed -e 's/^.*is owned by //' -e 's/ .*//'
}


check_primary_rpm
check_primary_dpkg
check_primary_pacman