rmsystem

#!/bin/bash

set -e -u

SYSTEM_SUFFIX=""

function printUsage
{
    echo "Usage: rmsystem [OPTION]..."
    echo "Remove ares2_platform build output 'system' directory in a safe manner."
    echo
    echo "  -o, --old   remove system-old backup instead of 'system'"
    echo "      --help  display this help and exit"
}

for i in "$@"; do
    case $i in
        -o|--old)
            SYSTEM_SUFFIX="-old"
            shift # past argument
            ;;
        -h|--help)
            printUsage
            exit 1
            ;;
        *)
            echo >&2 "error: Unknown argument $i"
            echo >&2 "aborting."
            exit 1
            ;;
    esac
done

systemPath="$HOME/builds/ares2_platform/debian/system${SYSTEM_SUFFIX}"
if [ -d "../system${SYSTEM_SUFFIX}" ]; then
    systemPath=$( cd "../system${SYSTEM_SUFFIX}"; pwd -P )
fi

if [ ! -d "$systemPath" ]; then
    echo "$systemPath doesn't exist."
    echo "Nothing to do, Exiting."
    exit 0
fi

#echo "Using systemPath: $systemPath"
#echo

if [[ $PWD =~ $systemPath ]]; then
    echo >&2 "You appear to be within the $systemPath directory."
    echo >&2 "Cannot remove directory that you are within."
    echo >&2 "aborting."
    exit 3
fi

trap "echo; exit" INT TERM EXIT

mountsInPath=$(mount | grep "$systemPath" | awk '{print $3}')
if [ -n "$mountsInPath" ]; then
    echo "There are mounts present:"
    for mount in $mountsInPath; do
        echo "    $mount"
    done
    echo "These need to be unmounted before removal."
    read -p "Unmount them [yN]? " -n 1 -t 300 unmount
    echo
    if [ "$unmount" != "y" -a "$unmount" != "Y" ]; then
        echo >&2 "Not unmounting mounts in $systemPath"
        echo >&2 "Cannot remove $systemPath as it contains mounted filesystems."
        echo >&2 "aborting."
        exit 2
    fi

    for mount in $mountsInPath; do
        sudo umount $mount
    done
    echo
fi

echo "We will be running the following command to remove the system dir:"
echo "    $ sudo rm -Rf $systemPath"
echo
read -p "Are you sure you wish to remove $systemPath [yN]? " -n 1 -t 10 GOODTOREMOVE
echo
if [ "$GOODTOREMOVE" != "y" -a "$GOODTOREMOVE" != "Y" ]; then
    echo >&2 "Not removing $systemPath"
    echo >&2 "User request to abort - $systemPath still exists."
    exit 0
fi
sudo rm -Rf "$systemPath"
echo "Done."

if [ ! -z "$SYSTEM_SUFFIX" ]; then
    read -p "Do you wish to move ${systemPath%$SYSTEM_SUFFIX} to ${systemPath} [yN]? " -n 1 -t 10 GOODTOMV
    echo
    if [ "$GOODTOMV" = "y" -o "$GOODTOMV" = "Y" ]; then
        mv ${systemPath%$SYSTEM_SUFFIX} ${systemPath}
        echo "Moved ${systemPath%$SYSTEM_SUFFIX} to ${systemPath}."
        echo "Done."
    fi
fi
trap - INT TERM EXIT