buildman: Automatically create a config file if needed

If there is no ~/.buildman file, buildman currently complains and exists. To
make things a little more friendly, create an empty one automatically. This
will not allow things to be built, but --fetch-arch can be used to handle
that.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

tools/buildman/bsettings.py

@@ -22,6 +22,10 @@ def Setup(fname=''):
         config_fname = fname
         if config_fname == '':
             config_fname = '%s/.buildman' % os.getenv('HOME')
+        if not os.path.exists(config_fname):
+            print 'No config file found ~/.buildman\nCreating one...\n'
+            CreateBuildmanConfigFile(config_fname)
+            print 'To install tool chains, please use the --fetch-arch option'
         if config_fname:
             settings.read(config_fname)
 
@@ -53,3 +57,43 @@ def SetItem(section, tag, value):
     if config_fname is not None:
         with open(config_fname, 'w') as fd:
             settings.write(fd)
+
+def CreateBuildmanConfigFile(config_fname):
+    """Creates a new config file with no tool chain information.
+
+    Args:
+        config_fname: Config filename to create
+
+    Returns:
+        None
+    """
+    try:
+        f = open(config_fname, 'w')
+    except IOError:
+        print "Couldn't create buildman config file '%s'\n" % config_fname
+        raise
+
+    print >>f, '''[toolchain]
+# name = path
+# e.g. x86 = /opt/gcc-4.6.3-nolibc/x86_64-linux
+
+[toolchain-prefix]
+# name = path to prefix
+# e.g. x86 = /opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-
+
+[toolchain-alias]
+# arch = alias
+# Indicates which toolchain should be used to build for that arch
+x86 = i386
+blackfin = bfin
+nds32 = nds32le
+openrisc = or1k
+
+[make-flags]
+# Special flags to pass to 'make' for certain boards, e.g. to pass a test
+# flag and build tag to snapper boards:
+# snapper-boards=ENABLE_AT91_TEST=1
+# snapper9260=${snapper-boards} BUILD_TAG=442
+# snapper9g45=${snapper-boards} BUILD_TAG=443
+'''
+    f.close();