rm_work.bbclass never deletes downloaded files, even if they are not
going to be needed again during the
build. rm_work_and_downloads.bbclass is more aggressive in minimizing
the used disk space during a build, but has other disadvantages:
- sources required by different recipes need to be fetched once per
  recipe, not once per build
- incremental builds do not work reliably because sources get
  removed without ensuring that sources gets fetched again

That makes rm_work_and_downloads.bbclass useful for one-time builds in
a constrained environment (like a CI system), but not for general use.

Signed-off-by: Patrick Ohly <patrick.o...@intel.com>
 meta/classes/rm_work_and_downloads.bbclass | 33 +++++++++++++++++++++++-
 1 file changed, 33 insertions(+)
 create mode 100644 meta/classes/rm_work_and_downloads.bbclass

diff --git a/meta/classes/rm_work_and_downloads.bbclass 
new file mode 100644
index 0000000..7c00bea
--- /dev/null
+++ b/meta/classes/rm_work_and_downloads.bbclass
@@ -0,0 +1,33 @@
+# Author:       Patrick Ohly <patrick.o...@intel.com>
+# Copyright:    Copyright (C) 2015 Intel Corporation
+# This file is licensed under the MIT license, see COPYING.MIT in
+# this source distribution for the terms.
+# This class is used like rm_work:
+# INHERIT += "rm_work_and_downloads"
+# In addition to removing local build directories of a recipe, it also
+# removes the downloaded source. This is achieved by making the DL_DIR
+# recipe-specific. While reducing disk usage, it increases network usage (for
+# example, compiling the same source for target and host implies downloading
+# the source twice).
+# Because the "do_fetch" task does not get re-run after removing the downloaded
+# sources, this class is also not suitable for incremental builds.
+# Where it works well is in well-connected build environments with limited
+# disk space (like TravisCI).
+inherit rm_work
+# This would ensure that the existing do_rm_work() removes the downloads,
+# but does not work because some recipes have a circular dependency between
+# WORKDIR and DL_DIR (via ${SRCPV}?).
+# DL_DIR = "${WORKDIR}/downloads"
+# Instead go up one level and remove ourself.
+do_rm_work_append () {
+    rm -rf ${DL_DIR}
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