One name might refer to both an egg and a C library

This happens for real with msgpack egg / C-library.

-> Fix handling of such situation via using (name, kind) instead of only
name as BOM key. Without the fix added test breaks as

    def addbom(urlpath, kind, version=None):
        name, ver = namever(urlpath)
        if version is not None:
            assert ver is None
            ver = version
        ver = removeprefix(ver, name+'-')   # wendelin.core-2.0.alpha3-0-g6315384  -> 2.0.alpha3-0-g6315384
        if '//' in urlpath:
            url = urlpath
        else:
            if kind == 'egg':
                # XXX not strictly correct -> better retrieve the actual URL, but buildout does not save it in installed.cfg
                url = 'https://pypi.org/project/%s/%s/' % (name, ver)
            else:
                raise NotImplementedError('TODO url for kind %r  (urlpath: %r)' % (kind, urlpath))

        info = PkgInfo(name, ver, kind, url)
        if name in bom:
>           assert bom[name] == info,  (bom[name], info)
E           AssertionError: (PkgInfo(name='msgpack', version='0.5.4', kind='', url='http://downloads.sourceforge.net/project/msgpack/msgpack/cpp/msgpack-0.5.4.tar.gz'), PkgInfo(name='msgpack', version='0.6.2', kind='egg', url='https://pypi.org/project/msgpack/0.6.2/'))

nxdbom/__init__.py

@@ -46,7 +46,7 @@ PkgInfo = namedtuple('PkgInfo', [
 
 
 # bom_software retrieves BOM from .installed.cfg generated by buildout along the build.
-def bom_software(installed_software_path): # -> {} name -> PkgInfo
+def bom_software(installed_software_path): # -> {} (name,kind) -> PkgInfo
     bom = {}
     def addbom(urlpath, kind, version=None):
         name, ver = namever(urlpath)
@@ -65,10 +65,11 @@ def bom_software(installed_software_path): # -> {} name -> PkgInfo
 
 
         info = PkgInfo(name, ver, kind, url)
-        if name in bom:
-            assert bom[name] == info,  (bom[name], info)
+        bkey = (name, kind)
+        if bkey in bom:
+            assert bom[bkey] == info,  (bom[bkey], info)
         else:
-            bom[name] = info
+            bom[bkey] = info
 
 
     idb = configparser.ConfigParser()

nxdbom/nxdbom_test.py

@@ -206,6 +206,25 @@ _e = /ROOT/eggs
 selenium                     3.141.0    https://pypi.org/project/selenium/3.141.0/
 """)
 
+# msgpack as egg and as c library at the same time
+case1("""
+[messagepack]
+recipe = slapos.recipe.cmmi
+url = http://downloads.sourceforge.net/project/msgpack/msgpack/cpp/msgpack-0.5.4.tar.gz
+
+[msgpack-python]
+recipe = zc.recipe.egg:custom
+__buildout_installed__ = /ROOT/develop-eggs/msgpack-0.6.2-py2.7-linux-x86_64.egg
+_d = /ROOT/develop-eggs
+_e = /ROOT/eggs
+egg = msgpack
+""", """\
+msgpack                      0.5.4      http://downloads.sourceforge.net/project/msgpack/msgpack/cpp/msgpack-0.5.4.tar.gz
+
+>>> eggs:
+msgpack                      0.6.2      https://pypi.org/project/msgpack/0.6.2/
+""")
+
 # %20 in URL
 case1("""\
 [zabbix-agent]