fix-permission

#!/bin/bash

# set -x

TARGET_USER=$1
TARGET_GROUP=$2
TARGET_DIR=$3

function get_target_uid() {
	echo $(stat -c '%u' $TARGET_DIR)
}

function get_target_gid() {
	echo $(stat -c '%g' $TARGET_DIR)
}

function get_current_uid_of() {
	echo $(getent passwd $1 | cut -d: -f3)
}

function get_current_username_of() {
	echo $(getent passwd $1 | cut -d: -f1)
}

function get_current_gid_of() {
	echo $(getent group $1 | cut -d: -f3)
}

function get_current_groupname_of() {
	echo $(getent group $1 | cut -d: -f1)
}

# Exist if UID and GID already match
if [[ get_target_uid -eq $(get_current_uid_of "$TARGET_USER") && get_target_gid -eq $(get_current_gid_of "$TARGET_GROUP") ]]; then
	# Nothing to do here...
	exit 0
fi

# Remove conflicting group if needed
if [[ $(get_target_gid) -ne $(get_current_gid_of "$TARGET_GROUP") && -z $(get_current_gid_of "$TARGET_GROUP") && $(get_target_gid) -ne 0 ]]; then
	groupdel $(get_target_gid)
	if [[ $? -ne 0 ]]; then
		exit $?
	fi
fi

# Remove conflicting user if needed
if [[ $(get_target_uid) -ne $(get_current_uid_of "$TARGET_USER") && -z $(get_current_uid_of "$TARGET_USER") && $(get_target_uid) -ne 0 ]]; then
	userdel $(get_target_uid)
	if [[ $? -ne 0 ]]; then
		exit $?
	fi
fi

# Create target group if needed
if [[ $TARGET_GROUP != $(get_current_groupname_of "$TARGET_GROUP") ]]; then
	groupadd -g $(get_target_gid) $TARGET_GROUP
fi

# Create target user if needed
if [[ $TARGET_USER != $(get_current_username_of "$TARGET_USER") ]]; then
	useradd -u $(get_target_uid) $TARGET_USER
fi

# Modify the GID if needed
if [[ $(get_target_gid) -ne $(get_current_gid_of "$TARGET_GROUP") ]]; then
	groupmod -g $(get_target_gid) $TARGET_GROUP
	if [[ $? -ne 0 ]]; then
		exit $?
	fi
fi

# Modify the UID if needed
if [[ $(get_target_uid) -ne $(get_current_uid_of "$TARGET_USER") ]]; then
	usermod -u $(get_target_uid) $TARGET_USER
	if [[ $? -ne 0 ]]; then
		exit $?
	fi
fi