#!/bin/sh
# S'assurer que BackupPC peux exécuter rsync avec les droits sudo
# Jérémy GARDAIS — Mai 2018

# .. vim: foldmarker=[[[,]]]:foldmethod=marker

# Vars [[[
SUCCESS=0
ERROR=1
DEBUG=0
EUID=$(id -u)

BACKUP_USER_LOGIN="backup"
#BACKUP_USER_LOGIN="backuppc"
SUDOERS_LINE_REGEXP="${BACKUP_USER_LOGIN}.*ALL.*=.*(ALL:ALL).*NOEXEC:NOPASSWD:.*/usr/bin/rsync"
# ]]]

# Functions [[[
is_user() ## [[[
{
	user_to_check="${1}"

	if [ "$(id -- "${user_to_check}" 2> /dev/null)" ] ; then
		[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Function — ${user_to_check} user is available."
		return "${SUCCESS}"
	else
		printf '\e[1;31m%-6s\e[m\n' "ERROR : Function — ${user_to_check} user is unavailable."
		exit "${ERROR}"
	fi
}
## ]]]
is_sudoers_line() ## [[[
{
	line_to_check="${1}"

	if grep -Rq -- "${line_to_check}" /etc/sudoers.d/
	then
		[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Function — ${line_to_check} line is available in sudo configuration."
		return "${SUCCESS}"
	else
		[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Function — ${line_to_check} was not found in sudo configuration."
		return "${ERROR}"
	fi
}
## ]]]
# ]]]

# Test permissions [[[
[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Check admin rights."
if [ "${EUID}" -ne "0" ]; then
	printf '\e[1;31m%-6s\e[m\n' "ERROR : You need to run with SUDO/Admin permissions."
	exit "${ERROR}"
fi
# ]]]

is_user "${BACKUP_USER_LOGIN}"

if is_sudoers_line "${SUDOERS_LINE_REGEXP}"
then
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : ${SUDOERS_LINE_REGEXP} is already set in sudo configuration."
	printf '%b\n' "Your configuration is set up."
	exit 0
else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : First try — ${SUDOERS_LINE_REGEXP} was not found in sudo configuration."
fi

[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : End"

exit 0