xbps-src: be more conservative with signal handlers.

xbps-src/shutils/chroot.sh.in

@@ -28,7 +28,7 @@
 # Actually this needs the xbps-base-chroot package installed.
 #
 
-trap "echo && chroot_handler_interrupted $?" INT QUIT TERM KILL
+trap "echo && chroot_handler_interrupted $?" INT QUIT TERM
 
 [ -n "$base_chroot" ] && return 0
 

xbps-src/shutils/pkgtarget_funcs.sh.in

@@ -124,14 +124,14 @@ install_pkg()
 
 	# Always write metadata to package's destdir.
 	. $XBPS_SHUTILSDIR/metadata.sh
-	trap 'remove_pkgdestdir_sighandler ${pkgname}' 0 INT
+	trap 'remove_pkgdestdir_sighandler ${pkgname}' INT
 	xbps_write_metadata_pkg
 	if [ $? -ne 0 ]; then
 		msg_red "cannot write package metadata for '$pkgname'!\n"
-		trap '' 0 INT
+		trap - INT
 		return 1
 	fi
-	trap '' 0 INT
+	trap - INT
 
 	[ "$install_destdir_target" = "yes" ] && return 0
 

xbps-src/xbps-src.sh.in

@@ -43,8 +43,7 @@ sighandler_exit()
         		env MASTERDIR="${_MASTERDIR}" \
 			@@XBPS_INSTALL_LIBEXECDIR@@/xbps-src-chroot-helper umount
 	fi
-	[ -n "$1" ] && exit $1
-	exit $?
+	exit $1
 }
 
 check_reqhost_utils()