Merge branch 'readability-changes' of kragle/libreboot into master

4 files changed, 217 insertions, 217 deletions

diff --git a/libs/common b/libs/common
index fd001a5d..43fe3b08 100755
--- a/libs/common
+++ b/libs/common
@@ -130,7 +130,7 @@ path_wildcard_expand() {
 	local path=$@
 
 	# Evaluation fails with unescaped whitespaces.
-	path=$( printf '%s\n' "$path" | sed "s/ /\\\ /g" )
+	path=$(printf '%s\n' "$path" | sed "s/ /\\\ /g")
 
 	eval "arguments_list "$path""
 }
@@ -139,8 +139,8 @@ file_checksum_create() {
 	local path=$1
 
 	local checksum_path="$path.$CHECKSUM"
-	local name=$( basename "$path" )
-	local directory_path=$( dirname "$path" )
+	local name=$(basename "$path")
+	local directory_path=$(dirname "$path")
 
 	(
 		cd "$directory_path"
@@ -152,12 +152,12 @@ file_checksum_check() {
 	local path=$1
 
 	local checksum_path="$path.$CHECKSUM"
-	local name=$( basename "$path" )
-	local directory_path=$( dirname "$path" )
+	local name=$(basename "$path")
+	local directory_path=$(dirname "$path")
 
-	if ! [ -f "$checksum_path" ]
+	if ! [[ -f "$checksum_path" ]]
 	then
-		printf '%s\n' 'Could not verify file checksum!' >&2
+		printf 1>&2 '%s\n' 'Could not verify file checksum!'
 		return 1
 	fi
 
@@ -172,7 +172,7 @@ file_signature_create() {
 
 	local signature_path="$path.$DSIG"
 
-	if [ -z "$RELEASE_KEY" ]
+	if [[ -z "$RELEASE_KEY" ]]
 	then
 		return 0
 	fi
@@ -185,9 +185,9 @@ file_signature_check() {
 
 	local signature_path="$path.$DSIG"
 
-	if ! [ -f "$signature_path" ]
+	if ! [[ -f "$signature_path" ]]
 	then
-		printf '%s\n' 'Could not verify file signature!' >&2
+		printf 1>&2 '%s\n' 'Could not verify file signature!'
 		return 1
 	fi
 
@@ -217,7 +217,7 @@ file_exists_check() {
 directory_filled_check() {
 	local path=$1
 
-	if [ -z "$( ls -A "$path" 2> /dev/null )" ]
+	if [[ -z "$(ls -A "$path" 2> /dev/null)" ]]
 	then
 		return 1
 	else
@@ -379,11 +379,11 @@ requirements() {
 
 	for requirement in "$@"
 	do
-		requirement_path=$( which "$requirement" || true )
+		requirement_path=$(which "$requirement" || true)
 
-		if [ -z "$requirement_path" ]
+		if [[ -z "$requirement_path" ]]
 		then
-			printf '%s\n' "Missing requirement: $requirement" >&2
+			printf 1>&2 '%s\n' "Missing requirement: $requirement"
 			exit 1
 		fi
 	done
@@ -396,11 +396,11 @@ requirements_root() {
 	for requirement in "$@"
 	do
 		# We need to keep stdout output to show the command.
-		requirement_path=$( execute_root which "$requirement" || true )
+		requirement_path=$(execute_root which "$requirement" || true)
 
-		if [ -z "$requirement_path" ]
+		if [[ -z "$requirement_path" ]]
 		then
-			printf '%s\n' "Missing requirement: $requirement" >&2
+			printf 1>&2 '%s\n' "Missing requirement: $requirement"
 			exit 1
 		fi
 	done
@@ -414,7 +414,7 @@ arguments_concat() {
 
 	for argument in "$@"
 	do
-		if ! [ -z "$concat" ]
+		if [[ -n "$concat" ]]
 		then
 			concat="$concat""$delimiter""$argument"
 		else
@@ -426,18 +426,18 @@ arguments_concat() {
 }
 
 execute_root() {
-	local sudo=$( which sudo 2> /dev/null || true )
+	local sudo=$(which sudo 2> /dev/null || true)
 	local arguments
 
-	printf '%s' 'Running command as root: ' >&2
-	printf '%b\n' "$*" >&2
+	printf 1>&2 '%s' 'Running command as root: '
+	printf 1>&2 '%b\n' "$*"
 
-	if ! [ -z "$sudo" ]
+	if [[ -n "$sudo" ]]
 	then
 		sudo "$@"
 	else
 		# Quote arguments for eval through su.
-		arguments=$( printf '%q ' "$@" )
+		arguments=$(printf '%q ' "$@")
 		su -c "$arguments"
 	fi
 }
diff --git a/libs/git b/libs/git
index decdfe01..1ca2358e 100755
--- a/libs/git
+++ b/libs/git
@@ -63,7 +63,7 @@ git_branch_create() {
 		cd "$repository_path"
 		git checkout -B "$branch"
 
-		if ! [ -z "$revision" ]
+		if [[ -n "$revision" ]]
 		then
 			git reset --hard "$revision"
 		fi
@@ -96,13 +96,13 @@ git_branch_check() {
 
 	(
 		cd "$repository_path" 2> /dev/null > /dev/null
-		if [ $? -ne 0 ]
+		if [[ $? -ne 0 ]]
 		then
 			return 1
 		fi
 
 		git rev-parse --verify "$branch" 2> /dev/null > /dev/null
-		if [ $? -ne 0 ]
+		if [[ $? -ne 0 ]]
 		then
 			return 1
 		fi
@@ -123,13 +123,13 @@ git_fetch_check() {
 
 	(
 		cd "$repository_path" 2> /dev/null > /dev/null
-		if [ $? -ne 0 ]
+		if [[ $? -ne 0 ]]
 		then
 			return 1
 		fi
 
-		local output=$( git fetch --dry-run origin 2>&1 )
-		if ! [ -z "$output" ]
+		local output=$(git fetch --dry-run origin 2>&1)
+		if [[ -n "$output" ]]
 		then
 			return 1
 		fi
@@ -220,7 +220,7 @@ git_project_repository_path() {
 git_project_check() {
 	local repository=$1
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 
 	git_check "$repository_path"
 }
@@ -257,8 +257,8 @@ git_project_clone() {
 	shift
 	local urls=$@
 
-	local repository_path=$( git_project_repository_path "$repository" )
-	local directory_path=$( dirname "$repository_path" )
+	local repository_path=$(git_project_repository_path "$repository")
+	local directory_path=$(dirname "$repository_path")
 	local url
 
 	mkdir -p "$directory_path"
@@ -270,7 +270,7 @@ git_project_clone() {
 		do
 			git_clone "$repository_path" "$url"
 
-			if [ $? -eq 0 ]
+			if [[ $? -eq 0 ]]
 			then
 				return 0
 			fi
@@ -297,11 +297,11 @@ git_project_prepare_blobs() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
-	local blobs_path=$( project_blobs_path "$project" "$@" )
+	local repository_path=$(git_project_repository_path "$repository")
+	local blobs_path=$(project_blobs_path "$project" "$@")
 	local blob
 
-	if ! [ -f "$blobs_path" ]
+	if ! [[ -f "$blobs_path" ]]
 	then
 		return
 	fi
@@ -320,7 +320,7 @@ git_project_prepare_patch() {
 	local repository=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local configs_path="$project_path/$CONFIGS"
 	local prepare_branch
 	local prepare_path
@@ -330,9 +330,9 @@ git_project_prepare_patch() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -344,7 +344,7 @@ git_project_prepare_patch() {
 
 		local revision_path="$configs_path/$path/$REVISION"
 
-		if ! [ -f "$revision_path" ]
+		if ! [[ -f "$revision_path" ]]
 		then
 			continue
 		fi
@@ -353,7 +353,7 @@ git_project_prepare_patch() {
 		prepare_path=$path
 	done
 
-	if ! [ -z "$prepare_branch" ]
+	if [[ -n "$prepare_branch" ]]
 	then
 		git_project_patch_recursive "$project" "$repository" "$prepare_branch" "$prepare_path"
 	fi
@@ -365,8 +365,8 @@ git_project_prepare_revision() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
-	local project_path=$( project_path "$project" )
+	local repository_path=$(git_project_repository_path "$repository")
+	local project_path=$(project_path "$project")
 	local configs_path="$project_path/$CONFIGS"
 	local prepare_branch
 	local prepare_revision
@@ -376,9 +376,9 @@ git_project_prepare_revision() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -390,16 +390,16 @@ git_project_prepare_revision() {
 
 		local revision_path="$configs_path/$path/$REVISION"
 
-		if ! [ -f "$revision_path" ]
+		if ! [[ -f "$revision_path" ]]
 		then
 			continue
 		fi
 
 		prepare_branch=$branch
-		prepare_revision=$( cat "$revision_path" )
+		prepare_revision=$(cat "$revision_path")
 	done
 
-	if ! [ -z "$prepare_branch" ]
+	if [[ -n "$prepare_branch" ]]
 	then
 		git_branch_create "$repository_path" "$prepare_branch" "$prepare_revision"
 	fi
@@ -411,8 +411,8 @@ git_project_prepare_check() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
-	local project_path=$( project_path "$project" )
+	local repository_path=$(git_project_repository_path "$repository")
+	local project_path=$(project_path "$project")
 	local configs_path="$project_path/$CONFIGS"
 	local prepare_branch
 	local branch=$project
@@ -421,9 +421,9 @@ git_project_prepare_check() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -435,7 +435,7 @@ git_project_prepare_check() {
 
 		local revision_path="$configs_path/$path/$REVISION"
 
-		if ! [ -f "$revision_path" ]
+		if ! [[ -f "$revision_path" ]]
 		then
 			continue
 		fi
@@ -443,7 +443,7 @@ git_project_prepare_check() {
 		prepare_branch=$branch
 	done
 
-	if ! [ -z "$prepare_branch" ]
+	if [[ -n "$prepare_branch" ]]
 	then
 		git_branch_check "$repository_path" "$prepare_branch"
 	fi
@@ -455,14 +455,14 @@ git_project_prepare_clean() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 	local prepare_branch
 	local branch=$project
 	local argument
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			branch="$branch-$argument"
 		fi
@@ -475,7 +475,7 @@ git_project_prepare_clean() {
 		prepare_branch=$branch
 	done
 
-	if ! [ -z "$prepare_branch" ]
+	if [[ -n "$prepare_branch" ]]
 	then
 		# Let's not worry about missing branches.
 		(
@@ -483,7 +483,7 @@ git_project_prepare_clean() {
 
 			git_branch_delete "$repository_path" "$prepare_branch"
 
-			if [ $? -ne 0 ]
+			if [[ $? -ne 0 ]]
 			then
 				return 0
 			fi
@@ -497,14 +497,14 @@ git_project_checkout() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 	local checkout_branch
 	local branch=$project
 	local argument
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			branch="$branch-$argument"
 		fi
@@ -517,7 +517,7 @@ git_project_checkout() {
 		checkout_branch=$branch
 	done
 
-	if ! [ -z "$checkout_branch" ]
+	if [[ -n "$checkout_branch" ]]
 	then
 		git_branch_checkout "$repository_path" "$checkout_branch"
 		git_submodule_update "$repository_path"
@@ -530,7 +530,7 @@ git_project_update() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 
 	git_fetch "$repository_path"
 	git_branch_checkout "$repository_path" "$ORIGIN_HEAD"
@@ -557,14 +557,14 @@ git_project_release() {
 	shift
 	local arguments=$@
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 	local release_branch
 	local branch=$project
 	local argument
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			branch="$branch-$argument"
 		fi
@@ -577,7 +577,7 @@ git_project_release() {
 		release_branch=$branch
 	done
 
-	if ! [ -z "$release_branch" ]
+	if [[ -n "$release_branch" ]]
 	then
 		local archive_path="$root/$RELEASE/$SOURCES/$project/$release_branch.$ARCHIVE"
 		local sources_path="$root/$SOURCES/$repository"
@@ -598,14 +598,14 @@ git_project_release_check() {
 	local repository=$1
 	shift
 
-	local repository_path=$( git_project_repository_path "$repository" )
+	local repository_path=$(git_project_repository_path "$repository")
 	local release_branch
 	local branch=$project
 	local argument
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			branch="$branch-$argument"
 		fi
@@ -618,13 +618,13 @@ git_project_release_check() {
 		release_branch=$branch
 	done
 
-	if ! [ -z "$release_branch" ]
+	if [[ -n "$release_branch" ]]
 	then
 		local archive_path="$root/$RELEASE/$SOURCES/$project/$release_branch.$ARCHIVE"
 
 		file_exists_check "$archive_path"
 
-		if [ $? -ne 0 ]
+		if [[ $? -ne 0 ]]
 		then
 			return 1
 		else
diff --git a/libs/project b/libs/project
index 37a5973c..4c8b2fff 100755
--- a/libs/project
+++ b/libs/project
@@ -24,7 +24,7 @@ INSTALL_REGEX='\([^:]*\):\(.*\)'
 project_include() {
 	local project=$1
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 
 	unset -f "${PROJECT_ACTIONS[@]}"
 
@@ -36,10 +36,10 @@ project_include() {
 project_helper_include() {
 	local project=$1
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local include="$project_path/$project-helper"
 
-	if [ -f "$include" ]
+	if [[ -f "$include" ]]
 	then
 		source "$include"
 	fi
@@ -81,12 +81,12 @@ project_action() {
 
 		project_action_check "$action" "$project" "$@"
 
-		printf '%s\n' "Project $project $action (with ${arguments:-no argument})" >&2
+		printf 1>&2 '%s\n' "Project $project $action (with ${arguments:-no argument})"
 
 		if "$action" "$@"; then
-			printf '\n%s\n' "Project $project $action (with ${arguments:-no argument}) completed" >&2
+			printf 1>&2 '\n%s\n' "Project $project $action (with ${arguments:-no argument}) completed"
 		else
-			printf '\n%s\n' "Project $project $action (with ${arguments:-no argument}) failed" >&2
+			printf 1>&2 '\n%s\n' "Project $project $action (with ${arguments:-no argument}) failed"
 			return 1
 		fi
 	)
@@ -171,7 +171,7 @@ project_action_arguments_verify_recursive() {
 		test="$(printf '%s\n' "$action_helper_arguments" | grep -e "^$argument\$" || true)"
 
 		if [[ -z "$test" ]]; then
-			printf '%s\n' "Invalid argument $argument for project $project action $action" >&2
+			printf 1>&2 '%s\n' "Invalid argument $argument for project $project action $action"
 			return 1
 		fi
 	fi
@@ -254,7 +254,7 @@ project_sources_path() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path-$argument"
 		fi
@@ -267,7 +267,7 @@ project_sources_path() {
 		sources_path=$path
 	done
 
-	if ! [ -z "$sources_path" ]
+	if [[ -n "$sources_path" ]]
 	then
 		printf '%s\n' "$sources_path"
 		return
@@ -287,7 +287,7 @@ project_sources_path() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
@@ -300,7 +300,7 @@ project_sources_path() {
 		sources_path=$path
 	done
 
-	if ! [ -z "$sources_path" ]
+	if [[ -n "$sources_path" ]]
 	then
 		printf '%s\n' "$sources_path"
 		return
@@ -311,7 +311,7 @@ project_sources_directory_filled_check() {
 	local project=$1
 	shift
 
-	local sources_path=$( project_sources_path "$project" "$@" )
+	local sources_path=$(project_sources_path "$project" "$@")
 
 	test ! -z "$sources_path"
 }
@@ -321,11 +321,11 @@ project_sources_directory_filled_error() {
 	shift
 	local arguments="$*"
 
-	local sources_path=$( project_sources_path "$project" "$@" )
+	local sources_path=$(project_sources_path "$project" "$@")
 
-	if ! [ -z "$sources_path" ]
+	if [[ -n "$sources_path" ]]
 	then
-		printf '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) already exists" >&2
+		printf 1>&2 '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) already exists"
 		return 1
 	else
 		return 0
@@ -337,11 +337,11 @@ project_sources_directory_missing_empty_error() {
 	shift
 	local arguments="$*"
 
-	local sources_path=$( project_sources_path "$project" "$@" )
+	local sources_path=$(project_sources_path "$project" "$@")
 
-	if [ -z "$sources_path" ]
+	if [[ -z "$sources_path" ]]
 	then
-		printf '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) missing or empty" >&2
+		printf 1>&2 '%s\n' "Sources directory for project $project (with ${arguments:-no argument}) missing or empty"
 		return 1
 	else
 		return 0
@@ -358,14 +358,14 @@ project_sources_archive() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path-$argument"
 		fi
 
 		local archive="$path.$ARCHIVE"
 
-		if ! [ -f "$archive" ]
+		if ! [[ -f "$archive" ]]
 		then
 			continue
 		fi
@@ -373,7 +373,7 @@ project_sources_archive() {
 		sources_archive=$archive
 	done
 
-	if ! [ -z "$sources_archive" ]
+	if [[ -n "$sources_archive" ]]
 	then
 		printf '%s\n' "$sources_archive"
 	fi
@@ -384,8 +384,8 @@ project_sources_archive_extract() {
 	shift
 	local arguments="$*"
 
-	local archive=$( project_sources_archive "$project" "$@" )
-	local destination=$( dirname "$archive" )
+	local archive=$(project_sources_archive "$project" "$@")
+	local destination=$(dirname "$archive")
 
 	printf '%s\n' "Extracting source archive for $project (with ${arguments:-no argument})"
 
@@ -399,11 +399,11 @@ project_sources_archive_update() {
 	local arguments="$*"
 
 	local repository=$project
-	local sources_path=$( project_sources_path "$project" "$repository" "$@" )
-	local archive=$( project_sources_archive "$project" "$@" )
-	local destination=$( dirname "$archive" )
+	local sources_path=$(project_sources_path "$project" "$repository" "$@")
+	local archive=$(project_sources_archive "$project" "$@")
+	local destination=$(dirname "$archive")
 
-	if [ -d "$sources_path" ]
+	if [[ -d "$sources_path" ]]
 	then
 		rm -rf "$sources_path"
 	fi
@@ -419,10 +419,10 @@ project_sources_archive_missing_error() {
 	shift
 	local arguments="$*"
 
-	local archive=$( project_sources_archive "$project" "$@" )
-	if [ -z "$archive" ] || ! [ -f "$archive" ]
+	local archive=$(project_sources_archive "$project" "$@")
+	if [[ -z "$archive" ]] || ! [[ -f "$archive" ]]
 	then
-		printf '%s\n' "Missing sources archive for $project (with ${arguments:-no argument})" >&2
+		printf 1>&2 '%s\n' "Missing sources archive for $project (with ${arguments:-no argument})"
 		return 1
 	else
 		return 0
@@ -433,8 +433,8 @@ project_sources_archive_missing_check() {
 	local project=$1
 	shift
 
-	local archive=$( project_sources_archive "$project" "$@" )
-	if [ -z "$archive" ] || ! [ -f "$archive" ]
+	local archive=$(project_sources_archive "$project" "$@")
+	if [[ -z "$archive" ]] || ! [[ -f "$archive" ]]
 	then
 		return 0
 	else
@@ -467,16 +467,16 @@ project_blobs_path() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local configs_path="$project_path/$CONFIGS"
 	local argument
 	local path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -486,7 +486,7 @@ project_blobs_path() {
 
 		local blobs_path="$configs_path/$path/$BLOBS"
 
-		if [ -f "$blobs_path" ]
+		if [[ -f "$blobs_path" ]]
 		then
 			printf '%s\n' "$blobs_path"
 			return
@@ -500,16 +500,16 @@ project_blobs_ignore_path() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local configs_path="$project_path/$CONFIGS"
 	local argument
 	local path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -519,7 +519,7 @@ project_blobs_ignore_path() {
 
 		blobs_ignore_path="$configs_path/$path/$BLOBS_IGNORE"
 
-		if [ -f "$blobs_ignore_path" ]
+		if [[ -f "$blobs_ignore_path" ]]
 		then
 			printf '%s\n' "$blobs_ignore_path"
 			return
@@ -531,7 +531,7 @@ project_arguments_targets() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local targets_path="$project_path/$CONFIGS"
 	local argument
 
@@ -542,7 +542,7 @@ project_arguments_targets() {
 
 	targets_path="$targets_path/$TARGETS"
 
-	if [ -f "$targets_path" ]
+	if [[ -f "$targets_path" ]]
 	then
 		cat "$targets_path"
 	fi
@@ -737,8 +737,8 @@ project_build_check() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
-	local build_path=$( project_build_path "$project" "$@" )
+	local project_path=$(project_path "$project")
+	local build_path=$(project_build_path "$project" "$@")
 	local source_file_path
 	local argument
 	local rule
@@ -746,9 +746,9 @@ project_build_check() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -758,20 +758,20 @@ project_build_check() {
 
 		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"
 
-		if ! [ -f "$configs_install_path" ]
+		if ! [[ -f "$configs_install_path" ]]
 		then
 			continue
 		fi
 
 		while read -r rule
 		do
-			source=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g" )
+			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
 			source_path="$build_path/$source"
 
 			# Source may contain a wildcard.
 			path_wildcard_expand "$source_path" | while read -r source_file_path
 			do
-				if ! [ -f "$source_file_path" ] && ! [ -d "$source_file_path" ]
+				if ! [[ -f "$source_file_path" ]] && ! [[ -d "$source_file_path" ]]
 				then
 					false
 				fi
@@ -800,11 +800,11 @@ project_build_directory_missing_empty_error() {
 	shift
 	local arguments="$*"
 
-	local build_path=$( project_build_path "$project" "$@" )
+	local build_path=$(project_build_path "$project" "$@")
 
 	if ! directory_filled_check "$build_path"
 	then
-		printf '%s\n' "Build directory for project $project (with ${arguments:-no argument}) missing or empty" >&2
+		printf 1>&2 '%s\n' "Build directory for project $project (with ${arguments:-no argument}) missing or empty"
 		return 1
 	else
 		return 0
@@ -815,9 +815,9 @@ project_install() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
-	local build_path=$( project_build_path "$project" "$@" )
-	local install_path=$( project_install_path "$project" "$@" )
+	local project_path=$(project_path "$project")
+	local build_path=$(project_build_path "$project" "$@")
+	local install_path=$(project_install_path "$project" "$@")
 	local source_file_path
 	local argument
 	local rule
@@ -826,9 +826,9 @@ project_install() {
 	# Install built files first.
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -838,7 +838,7 @@ project_install() {
 
 		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"
 
-		if ! [ -f "$configs_install_path" ]
+		if ! [[ -f "$configs_install_path" ]]
 		then
 			continue
 		fi
@@ -847,12 +847,12 @@ project_install() {
 
 		while read -r rule
 		do
-			source=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g" )
+			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
 			source_path="$build_path/$source"
 
-			destination=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g" )
+			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
 			destination_path="$install_path/$destination"
-			destination_directory_path=$( dirname "$destination_path" )
+			destination_directory_path=$(dirname "$destination_path")
 
 			mkdir -p "$destination_directory_path"
 
@@ -869,9 +869,9 @@ project_install() {
 	# Install install files then.
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -881,19 +881,19 @@ project_install() {
 
 		install_install_path="$project_path/$INSTALL/$path/$INSTALL"
 
-		if ! [ -f "$install_install_path" ]
+		if ! [[ -f "$install_install_path" ]]
 		then
 			continue
 		fi
 
 		while read -r rule
 		do
-			source=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g" )
+			source=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\1/g")
 			source_path="$project_path/$INSTALL/$path/$source"
 
-			destination=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g" )
+			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
 			destination_path="$install_path/$destination"
-			destination_directory_path=$( dirname "$destination_path" )
+			destination_directory_path=$(dirname "$destination_path")
 
 			mkdir -p "$destination_directory_path"
 
@@ -910,9 +910,9 @@ project_install_check() {
 	local project=$1
 	shift
 
-	local project_path=$( project_path "$project" )
-	local build_path=$( project_build_path "$project" "$@" )
-	local install_path=$( project_install_path "$project" "$@" )
+	local project_path=$(project_path "$project")
+	local build_path=$(project_build_path "$project" "$@")
+	local install_path=$(project_install_path "$project" "$@")
 	local argument
 	local rule
 	local path
@@ -920,9 +920,9 @@ project_install_check() {
 	# Install built files first.
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -932,7 +932,7 @@ project_install_check() {
 
 		configs_install_path="$project_path/$CONFIGS/$path/$INSTALL"
 
-		if ! [ -f "$configs_install_path" ]
+		if ! [[ -f "$configs_install_path" ]]
 		then
 			continue
 		fi
@@ -941,10 +941,10 @@ project_install_check() {
 
 		while read -r rule
 		do
-			destination=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g" )
+			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
 			destination_path="$install_path/$destination"
 
-			if ! [ -f "$destination_path" ] && ! [ -d "$destination_path" ]
+			if ! [[ -f "$destination_path" ]] && ! [[ -d "$destination_path" ]]
 			then
 				false
 			fi
@@ -956,9 +956,9 @@ project_install_check() {
 	# Install install files then.
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
-			if [ -z "$path" ]
+			if [[ -z "$path" ]]
 			then
 				path="$argument"
 			else
@@ -968,17 +968,17 @@ project_install_check() {
 
 		install_install_path="$project_path/$INSTALL/$path/$INSTALL"
 
-		if ! [ -f "$install_install_path" ]
+		if ! [[ -f "$install_install_path" ]]
 		then
 			continue
 		fi
 
 		while read -r rule
 		do
-			destination=$( printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g" )
+			destination=$(printf '%s\n' "$rule" | sed "s/$INSTALL_REGEX/\\2/g")
 			destination_path="$install_path/$destination"
 
-			if ! [ -f "$destination_path" ] && ! [ -d "$destination_path" ]
+			if ! [[ -f "$destination_path" ]] && ! [[ -d "$destination_path" ]]
 			then
 				false
 			fi
@@ -1006,11 +1006,11 @@ project_install_directory_missing_empty_error() {
 	shift
 	local arguments="$*"
 
-	local install_path=$( project_install_path "$project" "$@" )
+	local install_path=$(project_install_path "$project" "$@")
 
 	if ! directory_filled_check "$install_path"
 	then
-		printf '%s\n' "Install directory for project $project (with ${arguments:-no argument}) missing or empty" >&2
+		printf 1>&2 '%s\n' "Install directory for project $project (with ${arguments:-no argument}) missing or empty"
 		return 1
 	else
 		return 0
@@ -1025,9 +1025,9 @@ project_release_path() {
 	local release_path="$root/$RELEASE/$prefix"
 
 	# Special care for tools and systems, that depend on the host arch.
-	if [ "$prefix" = "$SYSTEMS" ] || [ "$prefix" = "$TOOLS" ]
+	if [[ "$prefix" = "$SYSTEMS" ]] || [[ "$prefix" = "$TOOLS" ]]
 	then
-		local machine=$( uname -m )
+		local machine=$(uname -m)
 
 		release_path="$release_path/$machine/$project"
 	else
@@ -1043,7 +1043,7 @@ project_release_archive_path() {
 	local prefix=$1
 	shift
 
-	local release_path=$( project_release_path "$project" "$prefix" )
+	local release_path=$(project_release_path "$project" "$prefix")
 	local argument
 	local path="$project"
 
@@ -1063,7 +1063,7 @@ project_release_rootfs_path() {
 	local prefix=$1
 	shift
 
-	local release_path=$( project_release_path "$project" "$prefix" )
+	local release_path=$(project_release_path "$project" "$prefix")
 	local argument
 	local path="$project"
 
@@ -1088,7 +1088,7 @@ project_release_sources_archive_path() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path-$argument"
 		fi
@@ -1103,7 +1103,7 @@ project_release_sources_archive_path() {
 		release_path=$path
 	done
 
-	if ! [ -z "$release_path" ]
+	if [[ -n "$release_path" ]]
 	then
 		local archive_path="$root/$RELEASE/$SOURCES/$project/$release_path.$ARCHIVE"
 
@@ -1117,8 +1117,8 @@ project_release_sources_archive_create() {
 	local arguments="$*"
 
 	local repository=$project
-	local archive_path=$( project_release_sources_archive_path "$project" "$@" )
-	local sources_path=$( project_sources_path "$project" "$repository" "$@" )
+	local archive_path=$(project_release_sources_archive_path "$project" "$@")
+	local sources_path=$(project_sources_path "$project" "$repository" "$@")
 
 	printf '%s\n' "Releasing sources archive for $project (with ${arguments:-no argument})"
 
@@ -1130,8 +1130,8 @@ project_release_sources_archive_exists_check() {
 	local project=$1
 	shift
 
-	local archive_path=$( project_release_sources_archive_path "$project" "$@" )
-	if [ -z "$archive_path" ] || ! [ -f "$archive_path" ]
+	local archive_path=$(project_release_sources_archive_path "$project" "$@")
+	if [[ -z "$archive_path" ]] || ! [[ -f "$archive_path" ]]
 	then
 		return 1
 	else
@@ -1185,20 +1185,20 @@ project_release_install() {
 	local prefix=$1
 	shift
 
-	local install_path=$( project_install_path "$project" "$@" )
-	local release_path=$( project_release_path "$project" "$prefix" )
+	local install_path=$(project_install_path "$project" "$@")
+	local release_path=$(project_release_path "$project" "$prefix")
 	local directory_path
 	local path
 
 	project_install_directory_missing_empty_error "$project" "$@"
 
-	local files=$( find "$install_path" -type f || true )
+	local files=$(find "$install_path" -type f || true)
 	local file
 
 	printf '%s\n' "$files" | while read -r file
 	do
 		path="$release_path/$file"
-		directory_path=$( dirname "$path" )
+		directory_path=$(dirname "$path")
 
 		mkdir -p "$directory_path"
 
@@ -1213,13 +1213,13 @@ project_release_install_check() {
 	local prefix=$1
 	shift
 
-	local install_path=$( project_install_path "$project" "$@" )
-	local release_path=$( project_release_path "$project" "$prefix" )
+	local install_path=$(project_install_path "$project" "$@")
+	local release_path=$(project_release_path "$project" "$prefix")
 	local path
 
 	project_install_directory_missing_empty_error "$project" "$@"
 
-	local files=$( find "$install_path" -type f || true )
+	local files=$(find "$install_path" -type f || true)
 	local file
 
 	printf '%s\n' "$files" | while read -r file
@@ -1255,8 +1255,8 @@ project_release_install_archive_create() {
 	shift
 	local arguments="$*"
 
-	local install_path=$( project_install_path "$project" "$@" )
-	local archive_path=$( project_release_archive_path "$project" "$prefix" "$@" )
+	local install_path=$(project_install_path "$project" "$@")
+	local archive_path=$(project_release_archive_path "$project" "$prefix" "$@")
 
 	printf '%s\n' "Releasing $prefix archive for $project (with ${arguments:-no argument})"
 
@@ -1270,7 +1270,7 @@ project_release_install_archive_exists_check() {
 	local prefix=$1
 	shift
 
-	local archive_path=$( project_release_archive_path "$project" "$prefix" "$@" )
+	local archive_path=$(project_release_archive_path "$project" "$prefix" "$@")
 
 	file_exists_check "$archive_path"
 }
@@ -1303,8 +1303,8 @@ project_release_install_rootfs_create() {
 	shift
 	local arguments="$*"
 
-	local install_path=$( project_install_path "$project" "$@" )
-	local rootfs_path=$( project_release_rootfs_path "$project" "$prefix" "$@" )
+	local install_path=$(project_install_path "$project" "$@")
+	local rootfs_path=$(project_release_rootfs_path "$project" "$prefix" "$@")
 
 	printf '%s\n' "Releasing $prefix rootfs for $project (with ${arguments:-no argument})"
 
@@ -1318,7 +1318,7 @@ project_release_install_rootfs_exists_check() {
 	local prefix=$1
 	shift
 
-	local rootfs_path=$( project_release_rootfs_path "$project" "$prefix" "$@" )
+	local rootfs_path=$(project_release_rootfs_path "$project" "$prefix" "$@")
 
 	file_exists_check "$rootfs_path"
 }
@@ -1336,7 +1336,7 @@ project_clean_build() {
 	local project=$1
 	shift
 
-	local build_path=$( project_build_path "$project" "$@" )
+	local build_path=$(project_build_path "$project" "$@")
 
 	rm -rf "$build_path"
 }
@@ -1345,7 +1345,7 @@ project_clean_install() {
 	local project=$1
 	shift
 
-	local install_path=$( project_install_path "$project" "$@" )
+	local install_path=$(project_install_path "$project" "$@")
 
 	rm -rf "$install_path"
 }
@@ -1358,7 +1358,7 @@ project_clean_release() {
 
 	for prefix in "$SOURCES" "$SYSTEMS" "$IMAGES" "$TOOLS" "$DOCS"
 	do
-		local release_path=$( project_release_path "$project" "$prefix" )
+		local release_path=$(project_release_path "$project" "$prefix")
 
 		rm -rf "$release_path"
 	done
@@ -1378,7 +1378,7 @@ project_clean_rootfs_install() {
 	local project=$1
 	shift
 
-	local install_path=$( project_install_path "$project" "$@" )
+	local install_path=$(project_install_path "$project" "$@")
 
 	execute_root rm -rf "$install_path"
 
@@ -1392,19 +1392,19 @@ project_file_path() {
 	local file=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local path="$project_path/$directory"
 	local argument
 	local file_path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
 
-		if ! [ -f "$path/$file" ]
+		if ! [[ -f "$path/$file" ]]
 		then
 			continue
 		fi
@@ -1412,7 +1412,7 @@ project_file_path() {
 		file_path="$path/$file"
 	done
 
-	if [ -z "$file_path" ]
+	if [[ -z "$file_path" ]]
 	then
 		return 1
 	fi
@@ -1421,15 +1421,15 @@ project_file_path() {
 }
 
 project_file_test() {
-	local file_path=$( project_file_path "$@" )
+	local file_path=$(project_file_path "$@")
 
 	test -f "$file_path"
 }
 
 project_file_contents() {
-	local file_path=$( project_file_path "$@" )
+	local file_path=$(project_file_path "$@")
 
-	if [ -f "$file_path" ]
+	if [[ -f "$file_path" ]]
 	then
 		cat "$file_path"
 	fi
@@ -1443,21 +1443,21 @@ project_file_contents_herit() {
 	local file=$1
 	shift
 
-	local project_path=$( project_path "$project" )
+	local project_path=$(project_path "$project")
 	local path="$project_path/$directory"
 	local argument
 	local file_path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
 
 		file_path="$path/$file"
 
-		if ! [ -f "$file_path" ]
+		if ! [[ -f "$file_path" ]]
 		then
 			continue
 		fi
diff --git a/libs/tool b/libs/tool
index 8ed70e18..2732238a 100755
--- a/libs/tool
+++ b/libs/tool
@@ -22,11 +22,11 @@ TOOL_ACTIONS_HELPERS=(arguments)
 tool_include() {
 	local tool=$1
 
-	local tool_path=$( tool_path "$tool" )
+	local tool_path=$(tool_path "$tool")
 
 	unset -f "${TOOL_ACTIONS[@]}"
 
-	. "$tool_path/$tool"
+	source "$tool_path/$tool"
 
 	tool_helper_include "$tool"
 }
@@ -34,12 +34,12 @@ tool_include() {
 tool_helper_include() {
 	local tool=$1
 
-	local tool_path=$( tool_path "$tool" )
+	local tool_path=$(tool_path "$tool")
 	local include="$tool_path/$tool-helper"
 
-	if [ -f "$include" ]
+	if [[ -f "$include" ]]
 	then
-		. "$include"
+		source "$include"
 	fi
 }
 
@@ -79,13 +79,13 @@ tool_action() {
 
 		if ! tool_check "$tool"
 		then
-			printf '%s\n' "Tool $tool check failed" >&2
+			printf 1>&2 '%s\n' "Tool $tool check failed"
 			return 1
 		fi
 
 		tool_action_check "$action" "$tool" "$@"
 
-		if [ $? -eq 0 ]
+		if [[ $? -eq 0 ]]
 		then
 			return 0
 		fi
@@ -97,19 +97,19 @@ tool_action() {
 			return 0
 		fi
 
-		printf '%s\n' "Tool $tool $action (with ${arguments:-no argument})" >&2
+		printf 1>&2 '%s\n' "Tool $tool $action (with ${arguments:-no argument})"
 
 		(
 			set -e
 			"$action" "$@"
 		)
 
-		if [ $? -ne 0 ]
+		if [[ $? -ne 0 ]]
 		then
-			printf '\n%s\n' "Tool $tool $action (with ${arguments:-no argument}) failed" >&2
+			printf 1>&2 '\n%s\n' "Tool $tool $action (with ${arguments:-no argument}) failed"
 			return 1
 		else
-			printf '\n%s\n' "Tool $tool $action (with ${arguments:-no argument}) completed" >&2
+			printf 1>&2 '\n%s\n' "Tool $tool $action (with ${arguments:-no argument}) completed"
 		fi
 	)
 }
@@ -125,7 +125,7 @@ tool_action_check() {
 
 		if ! tool_check "$tool"
 		then
-			printf '%s\n' "Tool $tool check failed" >&2
+			printf 1>&2 '%s\n' "Tool $tool check failed"
 			return 1
 		fi
 
@@ -138,7 +138,7 @@ tool_action_check() {
 
 		for tool_force in $TOOLS_FORCE
 		do
-			if [ "$tool_force" = "$tool" ]
+			if [[ "$tool_force" = "$tool" ]]
 			then
 				return 1
 			fi
@@ -162,7 +162,7 @@ tool_action_helper() {
 
 		if ! tool_check "$tool"
 		then
-			printf '%s\n' "Tool $tool check failed" >&2
+			printf 1>&2 '%s\n' "Tool $tool check failed"
 			return 1
 		fi
 
@@ -186,10 +186,10 @@ tool_action_arguments_recursive() {
 	local tool=$1
 	shift
 
-	local action_helper_arguments=$( tool_action_helper "arguments" "$tool" "$@" )
+	local action_helper_arguments=$(tool_action_helper "arguments" "$tool" "$@")
 	local argument
 
-	if [ $? -ne 0 ] || [ -z "$action_helper_arguments" ]
+	if [[ $? -ne 0 ]] || [[ -z "$action_helper_arguments" ]]
 	then
 		tool_action "$action" "$tool" "$@"
 	else
@@ -236,7 +236,7 @@ tool_sources_path() {
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
@@ -263,7 +263,7 @@ tool_usage_actions() {
 		fi
 	done
 
-	if [ $# -gt 0 ]
+	if [[ $# -gt 0 ]]
 	then
 		printf '\n%s\n' 'Specific actions:'
 
@@ -289,10 +289,10 @@ tool_usage_arguments_recursive() {
 	local spacing=$1
 	shift
 
-	local action_helper_arguments=$( tool_action_helper "arguments" "$tool" "$@" )
+	local action_helper_arguments=$(tool_action_helper "arguments" "$tool" "$@")
 	local argument
 
-	if ! [ -z "$action_helper_arguments" ]
+	if [[ -n "$action_helper_arguments" ]]
 	then
 		printf '%s\n' "$action_helper_arguments" | while read argument
 		do
@@ -310,19 +310,19 @@ tool_file_path() {
 	local file=$1
 	shift
 
-	local tool_path=$( tool_path "$tool" )
+	local tool_path=$(tool_path "$tool")
 	local path="$tool_path/$directory"
 	local argument
 	local file_path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
 
-		if ! [ -f "$path/$file" ]
+		if ! [[ -f "$path/$file" ]]
 		then
 			continue
 		fi
@@ -330,7 +330,7 @@ tool_file_path() {
 		file_path="$path/$file"
 	done
 
-	if [ -z "$file_path" ]
+	if [[ -z "$file_path" ]]
 	then
 		return 1
 	fi
@@ -339,15 +339,15 @@ tool_file_path() {
 }
 
 tool_file_test() {
-	local file_path=$( tool_file_path "$@" )
+	local file_path=$(tool_file_path "$@")
 
 	test -f "$file_path"
 }
 
 tool_file_contents() {
-	local file_path=$( tool_file_path "$@" )
+	local file_path=$(tool_file_path "$@")
 
-	if [ -f "$file_path" ]
+	if [[ -f "$file_path" ]]
 	then
 		cat "$file_path"
 	fi
@@ -361,21 +361,21 @@ tool_file_contents_herit() {
 	local file=$1
 	shift
 
-	local tool_path=$( tool_path "$tool" )
+	local tool_path=$(tool_path "$tool")
 	local path="$tool_path/$directory"
 	local argument
 	local file_path
 
 	for argument in "" "$@"
 	do
-		if ! [ -z "$argument" ]
+		if [[ -n "$argument" ]]
 		then
 			path="$path/$argument"
 		fi
 
 		file_path="$path/$file"
 
-		if ! [ -f "$file_path" ]
+		if ! [[ -f "$file_path" ]]
 		then
 			continue
 		fi