hooks: do-extract: extract to temp dir then rename

Extracting to temporary directory then renaming to real $wrksrc,
will make the do-extract steps works atomicity. Either $wrksrc is there
and complete, or it's not there.

Accidentally, this change has a side effect, we can no longer care about
the name of top-level components of a tarball, since we will rename the
top level directory in question to $wrksrc. IOW, we don't need to set
$wrksrc any longer.  The side effect of above side effect: we can starting
to build multiple packages that have same top-level's name without clean
from now on.

In another hand, we only rename the inner directory if the extracted
file hierarchy has single top-level directory, we will use the
renamed-temporary directory as the $wrksrc, $create_wrksrc variable is
no longer relevant, and do-clean will always work probably instead of
leaving some trash behind like before.

common/hooks/do-extract/00-distfiles.sh

@@ -3,7 +3,7 @@
 
 hook() {
 	local srcdir="$XBPS_SRCDISTDIR/$pkgname-$version"
-	local f j curfile found extractdir innerdir
+	local f j curfile found extractdir innerdir num_dirs
 	local TAR_CMD
 
 	if [ -z "$distfiles" -a -z "$checksum" ]; then
@@ -20,10 +20,6 @@ hook() {
 		fi
 	done
 
-	if [ -n "$create_wrksrc" ]; then
-		mkdir -p "${wrksrc}" || msg_error "$pkgver: failed to create wrksrc.\n"
-	fi
-
 	# Disable trap on ERR; the code is smart enough to report errors and abort.
 	trap - ERR
 
@@ -31,6 +27,9 @@ hook() {
 	[ -z "$TAR_CMD" ] && TAR_CMD="$(command -v tar)"
 	[ -z "$TAR_CMD" ] && msg_error "xbps-src: no suitable tar cmd (bsdtar, tar)\n"
 
+	extractdir=$(mktemp -d "$XBPS_BUILDDIR/.extractdir-XXXXXXX") ||
+		msg_error "Cannot create temporary dir for do-extract\n"
+
 	msg_normal "$pkgver: extracting distfile(s), please wait...\n"
 
 	for f in ${distfiles}; do
@@ -73,12 +72,6 @@ hook() {
 		*) msg_error "$pkgver: unknown distfile suffix for $curfile.\n";;
 		esac
 
-		if [ -n "$create_wrksrc" ]; then
-			extractdir="$wrksrc"
-		else
-			extractdir="$XBPS_BUILDDIR"
-		fi
-
 		case ${cursufx} in
 		tar|txz|tbz|tlz|tgz|crate)
 			$TAR_CMD -x --no-same-permissions --no-same-owner -f $srcdir/$curfile -C "$extractdir"
@@ -128,11 +121,7 @@ hook() {
 			fi
 			;;
 		txt)
-			if [ "$create_wrksrc" ]; then
-				cp -f $srcdir/$curfile "$extractdir"
-			else
-				msg_error "$pkgname: ${curfile##*.} files can only be extracted when create_wrksrc is set\n"
-			fi
+			cp -f $srcdir/$curfile "$extractdir"
 			;;
 		7z)
 			if command -v 7z &>/dev/null; then
@@ -163,4 +152,31 @@ hook() {
 			;;
 		esac
 	done
+
+	# find "$extractdir" -mindepth 1 -maxdepth 1 -printf '1\n' | wc -l
+	# However, it requires GNU's find
+	num_dirs=0
+	for f in "$extractdir"/* "$extractdir"/.*; do
+		if [ -e "$f" ] || [ -L "$f" ]; then
+			case "$f" in
+			*/. | */..) ;;
+			*)
+				innerdir="$f"
+				num_dirs=$(( num_dirs + 1 ))
+				;;
+			esac
+		fi
+	done
+	rm -rf "$wrksrc"
+	if [ "$num_dirs" = 1 ] && [ -d "$innerdir" ] && [ -z "$create_wrksrc" ]; then
+		# rename the subdirectory (top-level of distfiles) to $wrksrc
+		mv "$innerdir" "$wrksrc" &&
+		rmdir "$extractdir"
+	elif [ "$num_dirs" -gt 1 ] || [ -n "$create_wrksrc" ]; then
+		# rename the tmpdir to wrksrc
+		mv "$extractdir" "$wrksrc"
+	else
+		mkdir -p "$wrksrc"
+	fi ||
+		msg_error "$pkgver: failed to move sources to $wrksrc\n"
 }