local.conf.sample: Enable disk space monitoring by default

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Running out of space is a serious issue and can corrupt the build. Since
we can prevent it at minimal overhead, we might as well enable it by default.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/conf/local.conf.sample b/meta/conf/local.conf.sample
index d181e75..859eb93 100644
--- a/meta/conf/local.conf.sample
+++ b/meta/conf/local.conf.sample
@@ -184,6 +184,22 @@ USER_CLASSES ?= "buildstats image-mklibs image-prelink"
 PATCHRESOLVE = "noop"
 
 #
+# Disk Space Monitoring during the build
+#
+# Monitor the disk space during the build. If there is less that 1GB of space or less
+# than 100K inodes in any key build location (TMPDIR, DL_DIR, SSTATE_DIR), gracefully
+# shutdown the build. If there is less that 100MB or 1K inodes, perform a hard abort
+# of the build. The reason for this is that running completely out of space can corrupt
+# files and damages the build in ways which may not be easily recoverable.
+BB_DISKMON_DIRS = "\
+    STOPTASKS,${TMPDIR},1G,100K \
+    STOPTASKS,${DL_DIR},1G,100K \
+    STOPTASKS,${SSTATE_DIR},1G,100K \
+    ABORT,${TMPDIR},100M,1K \
+    ABORT,${DL_DIR},100M,1K \
+    ABORT,${SSTATE_DIR},100M,1K" 
+
+#
 # Shared-state files from other locations
 #
 # As mentioned above, shared state files are prebuilt cache data objects which can