setup-nm

#!/bin/bash -e

#This script will setup network connections in network manager automatically.
#I run with two settings on my system, dhcp and a static ip. This script will
#automatically set up network manager with the required connections.
#
#The static IP keyfile has been kept from the repository.
#
#More information:
#   http://arstechnica.com/civis/viewtopic.php?t=1163023
#   https://developer.gnome.org/NetworkManager/0.9/ref-settings.html

#Make sure we are root
if [[ "$UID" != 0 ]] ; then
    echo 'You must be root to do this.'
    echo "usage: sudo $0"
    exit 1
fi

#This scripts directory, used to find the pprint script
DIR=$(cd $(dirname "$0"); pwd)

source $DIR/pprint

#Location of the script's etc directory
ETC="$DIR/etc"

#This is the location for system connection key files
SYSCONS=/etc/NetworkManager/system-connections/

#Get the file name of the current auto-created Dhcp configuration
for f in $SYSCONS/* ; do
    #Make sure the file is an ethernet file and setup for Dhcp
    if grep -q '802-3-ethernet' "$f" && grep -q 'method=auto' "$f" ; then
        DHCP="$f"
        break
    fi
done

if [ -z "$DHCP" ] ; then
    die 'Failed to find the auto-created Dhcp network key file'
    exit 2
fi

#Change the name of the connection to Dhcp
info 'Fixing Dhcp key file'
sed -i 's/^id=.*$/id=Dhcp/' "$DHCP"

info 'Locating mac-address'
MAC=$( grep 'mac-address=' $DHCP | cut -d '=' -f 2 )
if [ -z "$MAC" ] ; then
    die 'Failed to discover the network mac address'
    exit 3
fi

#Fix up and place the manual connections
info 'Placing manual configuration files'
for f in $ETC/* ; do
    #Only process network manager key files
    if ! grep -q '^\[802-3-ethernet\]' "$f" ; then
        continue
    fi

    FNAME=$( basename "$f" )
    DEST="$SYSCONS/$FNAME"
    UUID=$( uuidgen )

    info "\tPlacing $FNAME key file"
    sed -e "s/mac-address=.*$/mac-address=$MAC/" \
        -e "s/uuid=.*$/uuid=$UUID/" "$f" > "$DEST"

    chmod 600 "$DEST"
done

info "Restarting network-manager"
service network-manager restart