recipetool / devtool: set a fixed SRCREV by default when fetching from git

If fetching source from a git repository, typically within OpenEmbedded
we encourage setting SRCREV to a fixed revision, so change to do that by
default and add a  -a/--autorev option to use "${AUTOREV}" instead.

(From OE-Core rev: 000480c42797dd2f03ebc3bc6d1dabfc6a7b75f5)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/devtool.py

@@ -207,12 +207,14 @@ class DevtoolTests(DevtoolBase):
         tempdir = tempfile.mkdtemp(prefix='devtoolqa')
         self.track_for_cleanup(tempdir)
         pn = 'dbus-wait'
+        srcrev = '6cc6077a36fe2648a5f993fe7c16c9632f946517'
         # We choose an https:// git URL here to check rewriting the URL works
         url = 'https://git.yoctoproject.org/git/dbus-wait'
         # Force fetching to "noname" subdir so we verify we're picking up the name from autoconf
         # instead of the directory name
         result = runCmd('git clone %s noname' % url, cwd=tempdir)
         srcdir = os.path.join(tempdir, 'noname')
+        result = runCmd('git reset --hard %s' % srcrev, cwd=srcdir)
         self.assertTrue(os.path.isfile(os.path.join(srcdir, 'configure.ac')), 'Unable to find configure script in source directory')
         # Test devtool add
         self.track_for_cleanup(self.workspacedir)
@@ -235,7 +237,7 @@ class DevtoolTests(DevtoolBase):
         checkvars['S'] = '${WORKDIR}/git'
         checkvars['PV'] = '0.1+git${SRCPV}'
         checkvars['SRC_URI'] = 'git://git.yoctoproject.org/git/dbus-wait;protocol=https'
-        checkvars['SRCREV'] = '${AUTOREV}'
+        checkvars['SRCREV'] = srcrev
         checkvars['DEPENDS'] = set(['dbus'])
         self._test_recipe_contents(recipefile, checkvars, [])
 
@@ -345,7 +347,7 @@ class DevtoolTests(DevtoolBase):
         self.track_for_cleanup(self.workspacedir)
         self.add_command_to_tearDown('bitbake -c cleansstate %s' % testrecipe)
         self.add_command_to_tearDown('bitbake-layers remove-layer */workspace')
-        result = runCmd('devtool add %s %s -f %s' % (testrecipe, srcdir, url))
+        result = runCmd('devtool add %s %s -a -f %s' % (testrecipe, srcdir, url))
         self.assertTrue(os.path.exists(os.path.join(self.workspacedir, 'conf', 'layer.conf')), 'Workspace directory not created: %s' % result.output)
         self.assertTrue(os.path.isfile(os.path.join(srcdir, 'configure.ac')), 'Unable to find configure.ac in source directory')
         # Test devtool status