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#!/bin/bash
###################################################################################################
# .drive-read-driverc
###################################################################################################
# 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.
###################################################################################################
###################################################################################################
#
# Reading the right option from .driverc: the option listed below the [<command>] section
# supersedes the one listed below the [global] sections.
#
###################################################################################################
#
# Requirements:
# ------------
#
# - We assume that drive-google package is already installed.
#
# - This command must be called from within your local Google Drive folder(s).
#
# - <google_drive_folder>/.driverc:it must be properly setup, either manually or with drive-setup,
# with the following settings:
# * ...: cf. https://github.com/odeke-em/drive for a complete list of available
# options. They can only be set manually through .driverc or through drive-setup for
# the sake of simplicity.
# Cf. /etc/drive-google/.driverc for some examples.
#
###################################################################################################
#
# Parameters:
# ----------
#
# - <option>: what is its value?
#
# - <command>: related command corresponding to the section within .driveselect.
# Cf. /etc/drive-google/.driveselect for a list of currently supported commands.
#
###################################################################################################
#
# Return codes:
# ------------
#
# - value of the <option> if it is defined
# - The value is null in the following cases:
# + <google_drive_folder>/.driverc has not been found
# + the <option> is not defined below at least one of the following sections (the first 3 are
# equivalent):
# * [global]
# * [all]
# * [*]
# * [<command>]
#
###################################################################################################
#
# Usage examples:
# --------------
# cd ~/<google_drive_folder>/parent/folder/
# value=$(.drive-read-driverc depth push)
#
###################################################################################################
if [[ $LOG_DRIVE_READ_DRIVERC == ON ]]; then
# Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
fd=$(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
option=$1
command=$2
section='out'
command_section=false
value=0
# Finding local root Google Drive folder
gd_root_folder="$(.drive-find-gd)"
return_code=$?
if [[ ($return_code -ne 0) ]]; then
# We cannot locate $gd_root_folder
echo ""
exit $return_code
fi
local_folder="$(pwd)"
local_folder_path_from_gd_root="${local_folder#$gd_root_folder}"
# If .driverc exists
if [[ -f "${gd_root_folder}"/.driverc ]]; then
# Reading the $option within .driverc in the right [$command] or [global] section
while IFS='' read -r line || [[ -n "$line" ]]; do
# Checking for blank lines or comments
if [[ (-z "${line}") || ("${line}" =~ ^#) ]]; then
continue
# Checking for [global] or [all] or [*]
elif [[ "$line" =~ (\[global\])|(\[all\])|(\[\*\]) ]]; then
section='in'
# Checking for [$command] (or among other commands separated by /)
elif [[ "$line" =~ \[.*${command}.*\] ]]; then
# [$command] section replaces [global] section
section='in'
command_section=true
elif [[ ($section == 'in') && ("$line" =~ \[.*\]) ]]; then
if [[ $command_section == 'true' ]]; then
# We've just finished reading the last [$command] section: we're done
break
else
section='out'
fi
elif [[ $section == 'in' ]]; then
option_tmp=$(echo "$line" | cut -d '=' -f 1)
if [[ "$option_tmp" == "$option" ]]; then
value=$(echo "$line" | cut -d '=' -f 2)
# Removing all spaces, tabs, line breaks
value=${value//[[:space:]]/}
fi
fi
done < "${gd_root_folder}/.driverc"
# Returning the value
echo "$value"
else
# Nothing to return
echo ""
fi
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