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#!/bin/bash
# provides some general-purpose script functions
#
# Copyright (C) 2004 Eric Marchionni, Patrik Rayo
# Zuercher Hochschule Winterthur
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
export TERM=xterm
RED=$(tput setaf 1)
GREEN=$(tput setaf 2)
NORMAL=$(tput op)
# exit with given error message
# $1 - error message
die() {
echo -e "${RED}$1${NORMAL}"
exit 1
}
# execute command
# $1 - command to execute
# $2 - whether or not to log command exit status
# (0 -> disable exit status logging)
execute()
{
cmd=${1}
echo $cmd >>$LOGFILE 2>&1
$cmd >>$LOGFILE 2>&1
status=$?
[ "$2" != 0 ] && log_status $status
if [ $status != 0 ]; then
echo
echo "! Command $cmd failed, exiting (status $status)"
echo "! Check why here $LOGFILE"
exit 1
fi
}
# execute command in chroot
# $1 - command to execute
execute_chroot()
{
execute "chroot $LOOPDIR $@"
}
# write green status message to console
# $1 - msg
echo_ok()
{
echo -e "${GREEN}$1${NORMAL}"
}
# write red status message to console
# $1 - msg
echo_failed()
{
echo -e "${RED}$1${NORMAL}"
}
# log an action
# $1 - current action description
log_action()
{
/bin/echo -n "[....] $1 "
}
# log an action status
# $1 - exit status of action
log_status()
{
tput hpa 0
if [ $1 -eq 0 ]; then
/bin/echo -ne "[${GREEN} ok ${NORMAL}"
else
/bin/echo -ne "[${RED}FAIL${NORMAL}"
fi
echo
}
# the following two functions are stolen from [1]
# [1] - http://www.linuxjournal.com/content/use-bash-trap-statement-cleanup-temporary-files
declare -a on_exit_items
# perform registered actions on exit
on_exit()
{
for ((onex=${#on_exit_items[@]}-1; onex>=0; onex--))
do
echo "On_Exit: ${on_exit_items[$onex]}" >>$LOGFILE
${on_exit_items[$onex]} >>$LOGFILE 2>&1
done
on_exit_items=""
trap - EXIT
}
# register a command to execute when the calling script terminates. The
# registered commands are called in FILO order.
# $* - command to register
do_on_exit()
{
local n=${#on_exit_items[*]}
on_exit_items[$n]="$*"
if [ $n -eq 0 ]; then
trap on_exit EXIT
fi
}
# wait for a mount to disappear
# $1 - device/image to wait for
# $2 - maximum time to wait in seconds, default is 5 seconds
graceful_umount()
{
secs=$2
[ ! $secs ] && secs=5
let steps=$secs*100
for st in `seq 1 $steps`
do
umount $1 >>$LOGFILE 2>&1
mount | grep $1 >/dev/null 2>&1
[ $? -eq 0 ] || return 0
sleep 0.01
done
return 1
}
# load qemu NBD kernel module, if not already loaded
load_qemu_nbd()
{
lsmod | grep ^nbd[[:space:]]* >/dev/null 2>&1
if [ $? != 0 ]
then
log_action "Loading NBD kernel module"
execute "modprobe nbd max_part=16"
fi
}
# check if given commands exist in $PATH
# $* - commands to check
check_commands()
{
for i in $*
do
command -v $i >/dev/null || { die "Required command $i not found"; exit 1; }
done
}
# check if any of the given virtual guests are running
# $* - names of guests to check
running_any()
{
command -v virsh >/dev/null || return 1
for host in $*
do
virsh list --name | grep "^$host$" >/dev/null && return 0
done
return 1
}
#############################################
# search and replace strings throughout a
# whole directory
#
function searchandreplace {
SEARCHSTRING="$1"
REPLACESTRING="$2"
DESTDIR="$3"
[ -d "$DESTDIR" ] || die "$DESTDIR is not a directory!"
###########################################
# search and replace in each found file the
# given string
#
for eachfoundfile in `find $DESTDIR -type f`
do
sed -i -e "s/$SEARCHSTRING/$REPLACESTRING/g" "$eachfoundfile"
done
}
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