[OE-core] [PATCH 5/7] sanity.bbclass: add extra information when SSTATE_CACHE unusable

[Joshua Lock]

If the user does not have write permissions to SSTATE_CACHE, detected by
the check_create_long_filename() test failing with a "Permission denied"
value in strerror, then suggest they might want to use the location as
an entry in SSTATE_MIRRORS.

Signed-off-by: Joshua Lock <josh at linux.intel.com>
---
 meta/classes/sanity.bbclass |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/meta/classes/sanity.bbclass b/meta/classes/sanity.bbclass
index 39da14b..e86edf7 100644
--- a/meta/classes/sanity.bbclass
+++ b/meta/classes/sanity.bbclass
@@ -100,6 +100,9 @@ def check_sanity_sstate_dir_change(sstate_dir, data):
     testmsg = ""
     if sstate_dir != "":
         testmsg = check_create_long_filename(sstate_dir, "SSTATE_DIR")
+        # If we don't have permissions to SSTATE_DIR, suggest the user set it as an SSTATE_MIRRORS
+        if testmsg.split(': ')[1].strip() == "Permission denied.":
+            testmsg = testmsg + "You could try using %s in SSTATE_MIRRORS rather than as an SSTATE_CACHE.\n" % (sstate_dir)
     return testmsg
 
 def check_sanity_tmpdir_change(tmpdir, data):
-- 
1.7.7.6