debuginstall: show directory for Python lib

Example new output

on Windows:

  $ hg debuginstall
  checking encoding (cp1252)...
  checking Python lib (C:\Users\adi\hgrepos\hg-main\hg-python\lib)...
  checking installed modules (C:\Users\adi\hgrepos\hg-main\mercurial)...
  checking templates (C:\Users\adi\hgrepos\hg-main\mercurial\templates)...
  checking commit editor...
  C:\Program Files (x86)\Notepad++\notepad++.exe
  checking username...
  no problems detected

on Linux:

  adi@kork-ubuntu64:~/hgrepos/hg-main$ ./hg debuginstall
  checking encoding (UTF-8)...
  checking Python lib (/usr/lib/python2.7)...
  checking installed modules (/home/adi/hgrepos/hg-main/mercurial)...
  checking templates (/home/adi/hgrepos/hg-main/mercurial/templates)...
  checking commit editor...
  checking username...
  no problems detected

mercurial/commands.py

@@ -1998,6 +1998,10 b' def debuginstall(ui):'
         ui.write(_(" (check that your locale is properly set)\n"))
         problems += 1
 
+    # Python lib
+    ui.status(_("checking Python lib (%s)...\n")
+              % os.path.dirname(os.__file__))
+
     # compiled modules
     ui.status(_("checking installed modules (%s)...\n")
               % os.path.dirname(__file__))

tests/test-install.t

@@ -1,6 +1,7 b''
 hg debuginstall
   $ hg debuginstall
   checking encoding (ascii)...
+  checking Python lib (*lib*)... (glob)
   checking installed modules (*mercurial)... (glob)
   checking templates (*mercurial?templates)... (glob)
   checking commit editor...
@@ -10,6 +11,7 b' hg debuginstall'
 hg debuginstall with no username
   $ HGUSER= hg debuginstall
   checking encoding (ascii)...
+  checking Python lib (*lib*)... (glob)
   checking installed modules (*mercurial)... (glob)
   checking templates (*mercurial?templates)... (glob)
   checking commit editor...