.

nxd-bom

@@ -20,7 +20,7 @@
 # See https://www.nexedi.com/licensing for rationale and options.
 """Program nxd-bom generates bill of material for a software-release or slapos node
 
-Usage: nxd-bom software   <.installed.cfg>
+Usage: nxd-bom software   <path-to-installed-software>
        nxd-bom node       <slapos deploy-script>
 """
 
@@ -31,21 +31,21 @@ from os.path import basename
 
 
 # bom_software retrieves BOM from .installed.cfg generated by buildout along the build.
-def bom_software(installed_cfg): # -> set of 'name-version'  XXX
+def bom_software(installed_software_path): # -> {} name -> version  + XXX
     bom = {}    # name -> ver + ...     XXX
 
-    inst = configparser.ConfigParser()
-    inst.read(installed_cfg)
+    idb = configparser.ConfigParser()
+    idb.read('%s/.installed.cfg' % installed_software_path)
 
     eggs_todo = set()   # eggs listed in zc.recipe.egg  - XXX
 
-    for s in inst.sections():
+    for s in idb.sections():
         if s == 'buildout':
             continue    # [buildout] is used internally
 
         #print(s)
 
-        part = inst[s]
+        part = idb[s]
         recipe = part['recipe']
 
         if recipe == 'slapos.recipe.cmmi':
@@ -132,8 +132,8 @@ _github_re = re.compile(r'github.com/\w+/(?P<name>\w+)/archive/(?P<rev>\w+)')
 def namever(url): # -> (name, ver)
     name, ver = _namever(url)
     for tail in ('tgz', 'tar.gz', 'tbz', 'tar.bz2', 'tar.xz', 'tar.lz'):
-        ver = ver.removesuffix('.'+tail)
-    ver.removeprefix('v')
+        ver = removesuffix(ver, '.'+tail)
+    ver = removeprefix(ver, 'v')
     return name, ver
 
 def _namever(url):
@@ -163,6 +163,17 @@ def isconf(url):
         return True
     return False
 
+
+# removeprefix/removesuffix provides fallbacks similarly-named str methods.
+def removeprefix(s, prefix):
+    if s.startswith(prefix):
+        s = s[len(prefix):]
+    return s
+def removesuffix(s, suffix):
+    if s.endswith(suffix):
+        s = s[:len(s)-len(suffix)]
+    return s
+
 # ----------------------------------------
 
 def main():