image_types.bbclass: remove the old images

Remove the old image before the new one generated to save disk
space when RM_OLD_IMAGE is set to 1, this is an easy way to keep
the DEPLOY_DIR_IMAGE clean.

[YOCTO #4391]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta-yocto/conf/local.conf.sample.extended b/meta-yocto/conf/local.conf.sample.extended
index d0dff80385b556372b2018605c631d2a2dcb05c9..3dc73fbec6e27b2848f59e3a529da2cad4b9ce33 100644 (file)
--- a/meta-yocto/conf/local.conf.sample.extended
+++ b/meta-yocto/conf/local.conf.sample.extended
@@ -211,3 +211,6 @@
 # Put the following two lines in the conf file with intact.
 #ARCHIVER_CLASS = "${@'archive-${ARCHIVER_MODE}-source' if ARCHIVER_MODE != 'none' else ''}"
 #INHERIT += "${ARCHIVER_CLASS}"
+
+# Remove the old image before the new one generated to save disk space
+#RM_OLD_IMAGE = "1"