AMiRo-OS

################################################################################

# AMiRo-OS is an operating system designed for the Autonomous Mini Robot       #

# (AMiRo) platform.                                                            #

# Copyright (C) 2016..2018  Thomas Schöpping et al.                            #

#                                                                              #

# 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 3 of the License, or            #

# (at your option) any later version.                                          #

#                                                                              #

# 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.                                 #

#                                                                              #

# You should have received a copy of the GNU General Public License            #

# along with this program.  If not, see <http://www.gnu.org/licenses/>.        #

#                                                                              #

# This research/work was supported by the Cluster of Excellence Cognitive      #

# Interaction Technology 'CITEC' (EXC 277) at Bielefeld University, which is   #

# funded by the German Research Foundation (DFG).                              #

################################################################################

#!/bin/bash

################################################################################

# GENERIC FUNCTIONS                                                            #

################################################################################

### print an error message #####################################################

# Prints a error <message> to standard output.

#If variable 'LOG_FILE' is specified, the message is also appended to the given file.

#

# usage:      printError <message>

# arguments:  <message>

#                 Message string to print.

# return:     n/a

#

function printError {

  local string="ERROR:   $1"

  # if a log file is specified

  if [ -n "$LOG_FILE" ]; then

    printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE

  fi

  printf "$(tput setaf 1)>>> $string$(tput sgr 0)" 1>&2

}

### print a warning message ####################################################

# Prints a warning <message> to standard output.

#If variable 'LOG_FILE' is specified, the message is also appended to the given file.

#

# usage:      printMessage <message>

# arguments:  <message>

#                 Message string to print.

# return:     n/a

#

function printWarning {

  local string="WARNING: $1"

  # if a log file is specified

  if [ -n "$LOG_FILE" ]; then

    printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE

  fi

  printf "$(tput setaf 3)>>> $string$(tput sgr 0)"

}

### print an information message ###############################################

# Prints an information <message> to standard output.

#If variable 'LOG_FILE' is specified, the message is also appended to the given file.

#

# usage:      printInfo <message>

# arguments:  <message>

#                 Message string to print.

# return:     n/a

#

function printInfo {

  local string="INFO:    $1"

  # if a log file is specified

  if [ -n "$LOG_FILE" ]; then

    printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE

  fi

  printf "$(tput setaf 2)>>> $string$(tput sgr 0)"

}

### print a message to file ####################################################

# Appends a <message> to a log file, specified by the variable 'LOG_FILE'.

#

# usage       printLog <message>

# arguments:  <message>

#                 Message string to print.

# return:     n/a

#

function printLog {

  local string="LOG:     $1"

  # if a log file is specified

  if [ -n "$LOG_FILE" ]; then

    printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE

  fi

}

### exit the script normally ###################################################

# Prints a delimiter and exits the script normally (returns 0).

#

# usage:      quitScript

# arguments:  n/a

# return:     0

#                 No error or warning occurred.

#

function quitScript {

  printInfo "exiting $(realpath ${BASH_SOURCE[0]})\n"

  printf "\n"

  printf "######################################################################\n"

  exit 0

}

### read a user input ##########################################################

# Reads a single character user input from a set up <options> and stores it in

# a given <return> variable.

#

# usage:      readUserInput <options> <return>

# arguments:  <options>

#                 String definiing the set of valid characters.

#                 If the string is empty, the user can input any character.

#             <return>

#                 Variable to store the selected character to.

# return:     n/a

#

function readUserInput {

  local input=""

  # read user input

  while [ -z $input ] || ( [ -n "$1" ] && [[ ! $input =~ ^[$1]$ ]] ); do

    read -p "your selection: " -n 1 -e input

    if [ -z $input ] || ( [ -n "$1" ] && [[ ! $input =~ ^[$1]$ ]] ); then

      printWarning "[$input] is no valid action\n"

    fi

  done

  printLog "[$input] has been selected\n"

  eval $2="$input"

}

### check whether argument is an option ########################################

# Checks a <string> whether it is an option.

# Options are defined to either start with '--' followed by any string, or

# to start with a single '-' followed by a single character, or

# to start with a single '-' followed by a single character, a '=' and any string.

# Examples: '--option', '--option=arg', '-o', '-o=arg', '--'

#

# usage:      parseIsOption <string>

# arguments:  <string>

#                 A string to check whether it is an option.

# return:     0

#                 <string> is an option.

#             -1

#                 <string> is not an option.

#

function parseIsOption {

  if [[ "$1" =~ ^-(.$|.=.*) ]] || [[ "$1" =~ ^--.* ]]; then

    return 0

  else

    return -1

  fi

}

### set the log file ###########################################################

# Sets a specified <infile> as log file and checks whether it already exists.

# If so, the log may either be appended to the file, its content can be cleared,

# or no log is generated at all.

# The resulting path is stored in <outvar>.

#

# usage:      setLogFile [--option=<option>] [--quiet] <infile> <outvar>

# arguments:  --option=<option>

#                 Select what to do if <file> already exists.

#                 Possible values are 'a', 'c', 'r' and 'n'.

#                 - a: append (starts with a separator)

#                 - c: continue (does not insert a seperator)

#                 - r: delete and restart

#                 - n: no log

#                 If no option is secified but <file> exists, an interactive selection is provided.

#             --quiet

#                 Suppress all messages.

#             <infile>

#                 Path of the wanted log file.

#             <outvar>

#                 Variable to store the path of the log file to.

# return:     0

#                 No error or warning occurred.

#             -1

#                 Error: invalid input

#

function setLogFile {

  local filepath=""

  local option=""

  local quiet=false

  # parse arguments

  local otherargs=()

  while [ $# -gt 0 ]; do

    if ( parseIsOption $1 ); then

      case "$1" in

        -o=*|--option=*)

          option=${1#*=}; shift 1;;

        -o*|--option*)

          option="$2"; shift 2;;

        -q|--quiet)

          quiet=true; shift 1;;

        *)

          printError "invalid option: $1\n"; shift 1;;

      esac

    else

      otherargs+=("$1")

      shift 1

    fi

  done

  filepath=$(realpath ${otherargs[0]})

  # if file already exists

  if [ -e $filepath ]; then

    # if no option was specified, ask what to do

    if [ -z "$option" ]; then

      printWarning "log file $filepath already esists\n"

      local userinput=""

      printf "Select what to do:\n"

      printf "  [A] - append log\n"

      printf "  [R] - restart log (delete existing file)\n"

      printf "  [N] - no log\n"

      readUserInput "AaRrNn" userinput

      option=${userinput,,}

    fi

    # evaluate option

    case "$option" in

      a|c)

        if [ $quiet = false ]; then

          printInfo "appending log to $filepath\n"

        fi

        if [ $option != c ]; then

          printf "\n" >> $filepath

          printf "######################################################################\n" >> $filepath

          printf "\n" >> $filepath

        fi

        ;;

      r)

        echo -n "" > $filepath

        if [ $quiet = false ]; then

          printInfo "content of $filepath wiped\n"

        fi

        ;;

      n)

        if [ $quiet = false ]; then

          printInfo "no log file will be generated\n"

        fi

        filepath=""

        ;;

      *) # sanity check (return error)

        printError "unexpected argument: $option\n"; return -1;;

    esac

  else

    if [ $quiet = false ]; then

      printInfo "log file set to $filepath\n"

    fi

  fi

  eval ${otherargs[1]}="$filepath"

  return 0

}

################################################################################

# SPECIFIC FUNCTIONS                                                           #

################################################################################

### print welcome text #########################################################

# Prints a welcome message to standard out.

#

# usage:      printWelcomeText

# arguments:  n/a

# return:     n/a

#

function printWelcomeText {

  printf "######################################################################\n"

  printf "#                                                                    #\n"

  printf "#             Welcome to the AMiRo-BLT submodule setup!              #\n"

  printf "#                                                                    #\n"

  printf "######################################################################\n"

  printf "#                                                                    #\n"

  printf "# Copyright (c) 2016..2018  Thomas Schöpping                         #\n"

  printf "#                                                                    #\n"

  printf "# This is free software; see the source for copying conditions.      #\n"

  printf "# There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR  #\n"

  printf "# A PARTICULAR PURPOSE. The development of this software was         #\n"

  printf "# supported by the Excellence Cluster EXC 227 Cognitive Interaction  #\n"

  printf "# Technology. The Excellence Cluster EXC 227 is a grant of the       #\n"

  printf "# Deutsche Forschungsgemeinschaft (DFG) in the context of the German #\n"

  printf "# Excellence Initiative.                                             #\n"

  printf "#                                                                    #\n"

  printf "######################################################################\n"

}

### print help #################################################################

# Prints a help text to standard out.

#

# usage:      printHelp

# arguments:  n/a

# return:     n/a

#

function printHelp {

  printInfo "printing help text\n"

  printf "usage:    $(basename ${BASH_SOURCE[0]}) [-h|--help] [-i|--init] [-s|--setup] [-w|--wipe] [-q|--quit] [--log=<file>]\n"

  printf "options:  -h, --help\n"

  printf "              Print this help text.\n"

  printf "          -i, --init\n"

  printf "              Initialize the AMiRo-BLT submodule.\n"

  printf "          -s, --setup\n"

  printf "              Enter AMiRo-BLT setup.\n"

  printf "          -w, --wipe\n"

  printf "              Wipe the entire AMiRo-BLT submodule.\n"

  printf "          -q, --quit\n"

  printf "              Quit the script.\n"

  printf "          --log=<file> \n"

  printf "              Specify a log file.\n"

}

### initialize AMiRo-BLT submodule #############################################

# Initialize the AMiRo-BLT submodule.

#

# usage:      initAmiroBlt

# arguments:  n/a

# return:     0

#                 No error or warning occurred.

#             1

#                 Warning: Arborted by user.

#             -1

#                 Error: Unexpected user input.

#

function initAmiroBlt {

  printInfo "initializing AMiRo-BLT submodule...\n"

  local userdir=$(pwd)

  local bootloaderdir=$(dirname $(realpath ${BASH_SOURCE[0]}))

  local amirobltdir=${bootloaderdir}/AMiRo-BLT

  # if the AMiRo-BLT folder is not empty

  if [ ! -z "$(ls -A $amirobltdir)" ]; then

    printWarning "$(realpath $amirobltdir) is not empty. Delete and reinitialize? [y/n]\n"

    local userinput=""

    readUserInput "YyNn" userinput

    case $userinput in

      Y|y)

        wipeAmiroBlt

        ;;

      N|n)

        printWarning "AMiRo-BLT initialization aborted by user\n"

        return 1

        ;;

      *) # sanity check (return error)

        printError "unexpected input: $userinput\n"; return -1;;

    esac

  fi

  # initialize submodule to default branch

  cd $bootloaderdir

  git submodule update --init $amirobltdir 2>&1 | tee -a $LOG_FILE

  while [ ${PIPESTATUS[0]} -ne 0 ]; do

    printWarning "initialitaion failed. Retry? [y/n]\n"

    local userinput=""

    readUserInput "YyNn" userinput

    case "$userinput" in

      Y|y)

        git submodule update --init $amirobltdir 2>&1 | tee -a $LOG_FILE;;

      N|n)

        printWarning "AMiRo-BLT initialization aborted by user\n"

        cd $userdir

        return 1

        ;;

      *) # sanity check (return error)

        printError "unexpected input: $userinput\n"; return -1;;

    esac

  done

  cd $userdir

  return 0

}

### enter AMiRo-BLT setup ######################################################

# Enter AMiRo-BLT submodule setup.

#

# usage:      amiroBltSetup

# arguments:  n/a

# return:     0

#                 No error or warning occurred.

#             -1

#                 Error: AMiRo-BLT submodule not initialized yet.

#

function amiroBltSetup {

  local amirobltdir=$(dirname $(realpath ${BASH_SOURCE[0]}))/AMiRo-BLT

  # check if AMiRo-BLT submodule is initialized

  if [ -z "$(ls -A $amirobltdir)" ]; then

    printError "$amirobltdir is empty. Please initialize first.\n"

    return -1

  else

    printInfo "entering AMiRo-BLT setup\n"

    printf "\n"

    if [ -z "$LOG_FILE" ]; then

      ${amirobltdir}/setup.sh --noinfo

    else

      ${amirobltdir}/setup.sh --LOG="$LOG_FILE" --noinfo

    fi

    return 0

  fi

}

### reset AMiRo-BLT submodule and wipe directory ###############################

# Resets the AMiRo-BLT Git submodule and wipes the directory.

#

# usage:      wipeAmiroBlt

# arguments:  n/a

# return:     n/a

function wipeAmiroBlt {

  printInfo "reset and wipe Git submodule $amirobltdir\n"

  local userdir=$(pwd)

  local bootloaderdir=$(dirname $(realpath ${BASH_SOURCE[0]}))

  local amirobltdir=${bootloaderdir}/AMiRo-BLT

  # if the AMiRo-BLT folder is empty

  if [ -z "$(ls -A $amirobltdir)" ]; then

    printWarning "$amirobltdir is already empty\n"

    return 1

  else

    # get some information from Git

    cd $bootloaderdir

    local git_basehash=($(git ls-tree -d HEAD $amirobltdir)); git_basehash=${git_basehash[2]}

    cd $amirobltdir

    local git_branch_current=$(git rev-parse --abbrev-ref HEAD)

    local git_difftobase="$(git diff ${git_basehash}..HEAD)"

    local git_commits=$(git log --format=oneline ${git_basehash}..HEAD)

    local git_dirtyfiles=($(git ls-files -dmo --exclude-standard --exclude=/doc))

    cd $userdir

    local issues=0

    # if HEAD is ahead of submodule base commit

    if [ -n "$git_difftobase" ]; then

      issues=$((issues + 1))

      printWarning "HEAD is ahead of submodule base\n"

    fi

    # if there are untracked, modified, or deleted files

    if [ ${#git_dirtyfiles[@]} != 0 ]; then

      issues=$((issues + 1))

      printWarning "there are ${#git_dirtyfiles[@]} untracked, modified, or deleted files\n"

    fi

    if [ $issues -gt 0 ]; then

      local userinput=""

      printWarning "$issues issues detected. Do you want to continue? [y/n]\n"

      readUserInput "YyNn" userinput

      case "$userinput" in

        Y|y)

          ;;

        N|n)

          printfWarning "wiping AMiRo-BLT Git submodule aborted by user\n"

          return 2

          ;;

        *) # sanity check (return error)

          printError "unexpected input: $userinput\n"; return -1;;

      esac

    fi

    # checkout base commit and delete all local branches

    cd $bootloaderdir

    git submodule update --force --checkout $amirobltdir | tee -a $LOG_FILE

    cd $amirobltdir

    local git_branches=($(git for-each-ref --format="%(refname)"))

    for branch in $git_branches; do

      if [[ $branch = *"heads/"* ]]; then

        git branch -D ${branch##*/} | tee -a $LOG_FILE

      fi

    done

    cd $userdir

    # deinitialize AMiRo-BLT submodule and delete any remaining files

    cd $bootloaderdir

    git submodule deinit -f $amirobltdir 2>&1 | tee -a $LOG_FILE

    rm -rf $amirobltdir/*

    cd $userdir

    return 0

  fi

}

### main function of this script ###############################################

# Initializes or wipes the AMiRo-BLT Git submodule, and provides an entry point

# to its setup.

#

# usage:      see function printHelp

# arguments:  see function printHelp

# return:     0

#                 No error or warning occurred.

#

function main {

  # print welcome/info text if not suppressed

  if [[ $@ != *"--noinfo"* ]]; then

    printWelcomeText

  else

    printf "######################################################################\n"

  fi

  printf "\n"

  # if --help or -h was specified, print the help text and exit

  if [[ $@ == *"--help"* || $@ == *"-h"* ]]; then

    printHelp

    printf "\n"

    quitScript

  fi

  # set log file if specified

  if [[ $@ == *"--log"* ]] || [[ $@ == *"--LOG"* ]]; then

    # get the parameter (file name)

    local cmdidx=1

    while [[ ! "${!cmdidx}" = "--log"* ]] && [[ ! "${!cmdidx}" = "--LOG"* ]]; do

      cmdidx=$[cmdidx + 1]

    done

    local cmd="${!cmdidx}"

    local logfile=""

    if [[ "$cmd" = "--log="* ]] || [[ "$cmd" = "--LOG="* ]]; then

      logfile=${cmd#*=}

    else

      local filenameidx=$((cmdidx + 1))

      logfile="${!filenameidx}"

    fi

    # optionally force silent appending

    if [[ "$cmd" = "--LOG"* ]]; then

      setLogFile --option=c --quiet "$logfile" LOG_FILE

    else

      setLogFile "$logfile" LOG_FILE

      printf "\n"

    fi

  fi

  # log script name

  printLog "this is $(realpath ${BASH_SOURCE[0]})\n"

  # parse arguments

  local otherargs=()

  while [ $# -gt 0 ]; do

    if ( parseIsOption $1 ); then

      case "$1" in

        -h|--help) # already handled; ignore

          shift 1;;

        -i|--init)

           initAmiroBlt; printf "\n"; shift 1;;

        -s|--setup)

           amiroBltSetup; printf "\n"; shift 1;;

        -w|--wipe)

           wipeAmiroBlt; printf "\n"; shift 1;;

        -q|--quit)

          quitScript; shift 1;;

        --log=*|--LOG=*) # already handled; ignore

          shift 1;;

        --log|--LOG) # already handled; ignore

          shift 2;;

        --noinfo) # already handled; ignore

          shift 1;;

        *)

          printError "invalid option: $1\n"; shift 1;;

      esac

    else

      otherargs+=("$1")

      shift 1

    fi

  done

  # interactive menu

  while ( true ); do

    # main menu info prompt and selection

    printInfo "Bootloader setup main menu\n"

    printf "Please select one of the following actions:\n"

    printf "  [I] - initialize AMiRo-BLT submodule\n"

    printf "  [S] - enter AMiRo-BLT setup\n"

    printf "  [W] - wipe AMiRo-BLT submodule\n"

    printf "  [Q] - quit this setup\n"

    local userinput=""

    readUserInput "IiSsWwQq" userinput

    printf "\n"

    # evaluate user selection

    case "$userinput" in

      I|i)

        initAmiroBlt; printf "\n";;

      S|s)

        amiroBltSetup; printf "\n";;

      W|w)

        wipeAmiroBlt; printf "\n";;

      Q|q)

        quitScript;;

      *) # sanity check (exit with error)

        printError "unexpected argument: $userinput\n";;

    esac

  done

  exit 0

}

################################################################################

# SCRIPT ENTRY POINT                                                           #

################################################################################

main "$@"