[PATCH v2 2/2] cml1.bbclass: Add diffconfig task to cml1

["João Henrique Ferreira de Freitas" <joaohf@gmail.com>]

diffconfig() is a new task that makes a diff between the
old and new config files and writes to the fragment.cfg result file.
menuconfig() always copy the original config file, so the user
doesn't need to copy it.

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
---
 meta/classes/cml1.bbclass | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/meta/classes/cml1.bbclass b/meta/classes/cml1.bbclass
index e292ecb..34c0c4e 100644
--- a/meta/classes/cml1.bbclass
+++ b/meta/classes/cml1.bbclass
@@ -16,8 +16,11 @@ HOST_LOADLIBES = "-lncurses"
 TERMINFO = "${STAGING_DATADIR_NATIVE}/terminfo"
 
 python do_menuconfig() {
+    import shutil
+
     try:
         mtime = os.path.getmtime(".config")
+        shutil.copy(".config", ".config.orig")
     except OSError:
         mtime = 0
 
@@ -38,3 +41,33 @@ do_menuconfig[depends] += "ncurses-native:do_populate_sysroot"
 do_menuconfig[nostamp] = "1"
 addtask menuconfig after do_configure
 
+python do_diffconfig() {
+    import shutil
+    import subprocess
+
+    workdir = d.getVar('WORKDIR', True)
+    fragment = workdir + '/fragment.cfg'
+    configorig = '.config.orig'
+    config = '.config'
+
+    try:
+        md5newconfig = bb.utils.md5_file(configorig)
+        md5config = bb.utils.md5_file(config)
+        isdiff = md5newconfig != md5config
+    except IOError as e:
+        bb.fatal("No config files found. Did you do menuconfig ?\n%s" % e)
+
+    if isdiff:
+        statement = 'diff -Nurp ' + configorig + ' ' + config + '| sed -n "s/^\+//p" >' + fragment
+        subprocess.call(statement, shell=True)
+
+        shutil.copy(configorig, config)
+
+        bb.plain("Config fragment has been dumped into:\n %s" % fragment)
+    else:
+        if os.path.exists(fragment):
+            os.unlink(fragment)
+}
+
+do_diffconfig[nostamp] = "1"
+addtask diffconfig
-- 
1.8.3.2