projects.py: Started implementation of required os cascade

Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/projects.py

@@ -21,6 +21,9 @@ def debug(*objs):
     if args.debug:
         print("DEBUG: ", *objs, file=sys.stderr)
 
+def err(*objs):
+        print("ERR: ", *objs, file=sys.stderr)
+
 def proj_dir(name):
     return projs_root + '/' + name
 
@@ -30,6 +33,19 @@ def re_section(name):
                  '(?=[)',
                  re.DOTALL)
 
+def get_os():
+    for d in [ projs_root + 'ytools/devutil/scripts', '/opt/ytools/bin' ]:
+        script=d + '/get_os.sh'
+        if os.path.isfile(script):
+            cmd = '/bin/bash ' + script
+            p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+            (out, rr) = p.communicate()
+            if rr:
+                err("failed to run ", cmd)
+                continue
+            return out
+    return "linux"
+
 # TODO: add support for customizing this in project.conf
 def htdocs_dir(name):
     pd = proj_dir(name)
@@ -39,8 +55,11 @@ def htdocs_dir(name):
             return r
     return None
 
-def required_cascade():
-    return []
+def pkg_required_os_cascade():
+    os = get_os()
+    # TODO: implement this
+    #return [ 'os', 'os.linux', 'os.linux.suse', 'os.linux.suse.tumbleweed' ] ?
+    return [ 'os', 'linux', 'suse', 'suse-tumbleweed' ]
 
 def strip_module_from_spec(mod):
     return re.sub(r'-devel$|-run$', '', re.split('([=><]+)', mod)[0].strip())