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#!/bin/bash
###################################################################################################
# .drive-compute-object-size
###################################################################################################
# Copyright 2017-2023 Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv3 License; you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.gnu.org/licenses/gpl-3.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if
# changes were made. You may do so in any reasonable manner, but not in any way that
# suggests the licensor endorses you or your use.
###################################################################################################
###################################################################################################
#
# Compute the size in bytes of a file/folder name containing its size expressed as a floating point
# number followed by its unit:
#
# - B: bytes
# - KB: kilobytes
# - MB: megabytes
# - GB: gigabytes
# - TB: terabytes
# - PB: petabytes
# - EB: exabytes
# - ZB: zettabytes
# - YB: yottabytes
#
###################################################################################################
#
# Requirements:
# ------------
#
# - We assume that:
# + bc, coreutils, perl-base & zenity packages are already installed.
#
###################################################################################################
#
# Parameter:
# ---------
#
# - <object>: file/folder name with the following format:
# <object_type> <object_size> <objezct_name>
#
###################################################################################################
#
# Returned value:
# --------------
#
# - <object_size>: size of the object converted in bytes
#
###################################################################################################
#
# Usage example:
# -------------
#
# object_size=$(.drive-compute-object-size "$object")
#
###################################################################################################
if [[ $LOG_DRIVE_COMPUTE_OBJECT_SIZE == ON ]]; then
# Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
fd=$(ls -al /proc/$$/fd | grep ~/.drive-google/logs/drive-google.log | sed -E 's|^.* ([0-9]+) -> .*$|\1|g' | sort -V | tail -n 1)
# Case where fd is unset, i.e the file ~/.drive-google/logs/drive-google.log has not yet been opened
if [[ -z $fd ]]; then
lowest_unused_fd ()
{
local fd=0
while [ -e /proc/$$/fd/${fd} ]; do
fd=$((fd+1))
done
echo $fd
}
fd=$(lowest_unused_fd)
# Opening ~/.drive-google/logs/drive-google.log as file descriptor $fd for appending
eval "exec $fd>> ~/.drive-google/logs/drive-google.log"
fi
# Writing the trace output generated when set -x is enabled to file descriptor $fd
eval "BASH_XTRACEFD=$fd"
# Logging line numbers - We could also use ${0} for ${BASH_SOURCE}
BASH_SOURCE_BASENAME=$(basename ${BASH_SOURCE})
export PS4='${BASH_SOURCE_BASENAME}.${LINENO}+ '
# Expanding all variables and prints the full commands before output of the command
set -x
fi
# Preventing globbing (pathname expansion)
set -o noglob
# Allowing extended globbing
shopt -s extglob
# Expanding aliases
shopt -s expand_aliases
# Including alias definitions to sed/grep/awk/perl commands for readability sake
. /usr/include/drive-google/aliases
object="$1"
# Getting object size with perl: sed does not recognize the non-greedy quantifier '?'
object_size_with_multiplier=$(echo "$object" | extract_object_size)
# Getting object size multiplier with perl: sed does not recognize the non-greedy quantifier '?'
multiplier=$(echo "$object_size_with_multiplier" | extract_object_size_multiplier)
if [[ ! ("$multiplier" =~ [0-9]B) ]]; then
# Removing $multiplier from $object_size_with_multiplier
object_size_base=${object_size_with_multiplier%$multiplier}
else
# Removing $multiplier from $object_size_with_multiplier
object_size_base=${object_size_with_multiplier%B}
fi
# Going far just for fun :-)
case $multiplier in
[0-9]B)
object_size=$(LC_ALL=C printf '%.0f' "$object_size_base")
;;
KB)
floating_object_size=$(echo "${object_size_base}*1024" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
MB)
floating_object_size=$(echo "${object_size_base}*(1024^2)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
GB)
floating_object_size=$(echo "${object_size_base}*(1024^3)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
TB)
floating_object_size=$(echo "${object_size_base}*(1024^4)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
PB)
floating_object_size=$(echo "${object_size_base}*(1024^5)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
EB)
floating_object_size=$(echo "${object_size_base}*(1024^6)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
ZB)
floating_object_size=$(echo "${object_size_base}*(1024^7)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
YB)
floating_object_size=$(echo "${object_size_base}*(1024^8)" | bc)
object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
;;
*)
zenity --error --title "Fatal error in .drive-compute-object-size" --text="\t- Object: $object\n\t- Unknown multiplier: $multiplier\n\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues" --width 1200
exit 1
;;
esac
# Returning the object size in bytes
echo ${object_size}
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