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>

scripts/lib/devtool/standard.py

@@ -144,6 +144,8 @@ def add(args, config, basepath, workspace):
         extracmdopts += ' --also-native'
     if args.src_subdir:
         extracmdopts += ' --src-subdir "%s"' % args.src_subdir
+    if args.autorev:
+        extracmdopts += ' -a'
 
     tempdir = tempfile.mkdtemp(prefix='devtool')
     try:
@@ -1390,6 +1392,7 @@ def register_commands(subparsers, context):
     parser_add.add_argument('--fetch', '-f', help='Fetch the specified URI and extract it to create the source tree (deprecated - pass as positional argument instead)', metavar='URI')
     parser_add.add_argument('--version', '-V', help='Version to use within recipe (PV)')
     parser_add.add_argument('--no-git', '-g', help='If fetching source, do not set up source tree as a git repository', action="store_true")
+    parser_add.add_argument('--autorev', '-a', help='When fetching from a git repository, set SRCREV in the recipe to a floating revision instead of fixed', action="store_true")
     parser_add.add_argument('--binary', '-b', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure). Useful with binary packages e.g. RPMs.', action='store_true')
     parser_add.add_argument('--also-native', help='Also add native variant (i.e. support building recipe for the build host as well as the target machine)', action='store_true')
     parser_add.add_argument('--src-subdir', help='Specify subdirectory within source tree to use', metavar='SUBDIR')