Test Mirrors

#!/bin/bash

# Example given with Wireshark. Script tests ping times for Wireshark's mirrors and selects the fastest.

MIRRORS=(
  '1.as.dl.wireshark.org'
  '1.eu.dl.wireshark.org'
  '1.na.dl.wireshark.org'
  '2.na.dl.wireshark.org'
#  'www.wireshark.org'
)

getMirrorSpeeds(){
  for MIRROR in ${MIRRORS[@]}; do
    PING_TIME="$(/sbin/ping -c1 -W 2000 "$MIRROR" | /usr/bin/grep -oE 'time=.*\..* ms' | /usr/bin/tr -d 'a-zA-Z =')"
    if [[ "$PING_TIME" == '' ]]; then
      PING_TIME="2000.000"
    fi
    /usr/bin/printf "%s\n" "$PING_TIME"
  done
}

OIFS=$IFS
IFS=$'\n'

MIRROR_SPEEDS=($(getMirrorSpeeds))

# for (( n = 0; n < ${#MIRROR_SPEEDS[@]}; n++ )); do
#   /usr/bin/printf "%s = %s\n" "${MIRRORS[$n]}" "${MIRROR_SPEEDS[$n]}"
# done

KEY_INDEX="0"
IFS='.' read -r -a FASTEST_MIRROR <<< "${MIRROR_SPEEDS[0]}"
for (( i = 0; i < ${#MIRROR_SPEEDS[@]}; i++ )); do
  IFS='.' read -r -a CONTESTANT <<< "${MIRROR_SPEEDS[(( $i + 1 ))]}"
  for (( l = 0; l<${#CONTESTANT[@]}; l++ )); do
    if [[ ${FASTEST_MIRROR[l]} -eq ${CONTESTANT[l]} ]]; then
      : # /usr/bin/printf "${FASTEST_MIRROR[l]} equals ${CONTESTANT[l]}\n"
    elif [[ ${FASTEST_MIRROR[l]} -gt ${CONTESTANT[l]} ]]; then
      KEY_INDEX="$(( $i + 1 ))"
      # /usr/bin/printf "NEW FASTEST: %s\n" "$KEY_INDEX"
      # /usr/bin/printf "${FASTEST_MIRROR[l]} greater than ${CONTESTANT[l]}\n"
      IFS='.' read -r -a FASTEST_MIRROR <<< "${MIRROR_SPEEDS[(( $i + 1 ))]}"
      break
    else
      # /usr/bin/printf "${FASTEST_MIRROR[l]} is less than ${CONTESTANT[l]}\n"
      break
    fi
  done
done

SELECTED_MIRROR="${MIRRORS[$KEY_INDEX]}"

# /usr/bin/printf "\t\tFASTEST MIRROR: %s\n" "$SELECTED_MIRROR"
# /usr/bin/printf "\t\tINSTALLER VERSION: %s\n" "${INSTALLER_VERSION}"

/usr/bin/printf "https://%s/osx/Wireshark%%20%s%%20Intel%%2064.dmg" "$SELECTED_MIRROR" "${INSTALLER_VERSION}"
IFS=$OIFS