insane: add qa check for uppercase recipe name

Since we disabled uppercase characters in overrides a few releases
ago, uppercase characters in recipe names (and for that matter, distro
and machine names) cannot be supported due to their reliance upon
overrides including the name.

QA check will produce an warning message when it verify that recipe
name is uppercase.

[YOCTO# 11592]

(From OE-Core rev: 4713f8b2c4f2c74239d284adcf1e59e61aa66576)

Signed-off-by: Yeoh Ee Peng <ee.peng.yeoh@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/insane.bbclass

@@ -16,7 +16,7 @@
 #   into exec_prefix
 #  -Check that scripts in base_[bindir|sbindir|libdir] do not reference
 #   files under exec_prefix
-
+#  -Check if the package name is upper case
 
 QA_SANE = "True"
 
@@ -27,7 +27,7 @@ WARN_QA ?= "ldflags useless-rpaths rpaths staticdev libdir xorg-driver-abi \
             installed-vs-shipped compile-host-path install-host-path \
             pn-overrides infodir build-deps \
             unknown-configure-option symlink-to-sysroot multilib \
-            invalid-packageconfig host-user-contaminated \
+            invalid-packageconfig host-user-contaminated uppercase-pn \
             "
 ERROR_QA ?= "dev-so debug-deps dev-deps debug-files arch pkgconfig la \
             perms dep-cmp pkgvarcheck perm-config perm-line perm-link \
@@ -1248,6 +1248,8 @@ do_configure[postfuncs] += "do_qa_configure "
 do_unpack[postfuncs] += "do_qa_unpack"
 
 python () {
+    import re
+    
     tests = d.getVar('ALL_QA').split()
     if "desktop" in tests:
         d.appendVar("PACKAGE_DEPENDS", " desktop-file-utils-native")
@@ -1274,6 +1276,9 @@ python () {
     if pn in overrides:
         msg = 'Recipe %s has PN of "%s" which is in OVERRIDES, this can result in unexpected behaviour.' % (d.getVar("FILE"), pn)
         package_qa_handle_error("pn-overrides", msg, d)
+    prog = re.compile('[A-Z]')
+    if prog.search(pn):
+        package_qa_handle_error("uppercase-pn", 'PN: %s is upper case, this can result in unexpected behavior.' % pn, d)
 
     issues = []
     if (d.getVar('PACKAGES') or "").split():