[Samba] Error Upgrading Schema

Matthew Delfino Samba List mdelfino.list.samba at KNOCKinc.com
Fri Nov 20 02:13:59 UTC 2020

Thank you, Andrew!

This evening I attempted the upgrade. I first carefully commented out each of the attributes from the Schema-Updates.md file. I then saved the file and ran the following command, which gave me the subsequent output:

(as root)

  # samba-tool domain schemaupgrade
  Temporarily overriding 'dsdb:schema update allowed' setting
  Patched Sch49.ldf using /usr/share/samba/setup/adprep/WindowsServerDocs/Sch49.ldf.diff
  Exception in patch: b'patching file Sch50.ldf\nHunk #2 succeeded at 207 (offset -37 lines).\nHunk #3 FAILED at 277.\n1 out of 3 hunks FAILED -- saving rejects to file Sch50.ldf.rej\n'
  ERROR: Failed to upgrade schema

I had hoped there was a Sch50.ldf.rej in the working directory, or in the same folder wherein Schema-Updates.md makes its home. Unfortunately, there was nothing there. A find for any file by that name revealed nothing as well.

I read this output to tell me that the schema upgrade went through Sch49.ldf.diff without issue, but ran into some kind of problem in Sch50.ldf.diff OR... there appears to be a section in Schema-Updates.md for Sch50.ldf: line 3120 " ### <a name="BKMK_Sch50"></a>Sch50.ldf" and something about the syntax below that line is going bad? Indeed, I do have some attributes in that section commented out:


(The comment character I am using is a hash tag "#", by the way).

And one of those attributes is described in the Sch50.ldf.diff file as well (CN=ms-DS-Value-Type-Reference-BL,CN=Schema,CN=Configuration,DC=X).

Do you have any ideas as to what I may have done wrong or forgot?

Thank you again for any time you can spare to assist me in upgrading my schema.


On 2020.11.18, 5:34 PM, "Andrew Bartlett" <abartlet at samba.org> wrote:

    On Wed, 2020-11-18 at 23:12 +0000, Matthew Delfino Samba List via samba
    > There is only one thing that concerns me: One of the attributes
    > specified in the Samba script has a parameter whose value directly
    > contradicts the value specified in my old ldif file:

    Well done with the analysis!

    > In Samba script:
    >   dn: CN=ms-DS-Claim-Shares-Possible-Values-
    > With,CN=Schema,CN=Configuration,DC=X
    >   isSingleValued: FALSE
    > In my ldif file:
    >   dn: cn=ms-DS-Claim-Shares-Possible-Values-
    > With,cn=Schema,cn=Configuration,dc=X
    >   isSingleValued: TRUE
    > If left unaltered, I wonder if this condition is going to lead to
    > mayhem?

    Not until we implement whatever uses that (probably Windows 2012 R2
    Functional level) and only if you want to have more than one of that

    > Having said all of that, if I simply comment out all these attributes
    > I found, I suspect the schema upgrade may complete. If I'm right and
    > the syntax differences noted above are unimportant, and the
    > parameters that were missing from my ldif don't matter, I am left
    > only with the "isSingleValued" difference in "ms-DS-Claim-Shares-
    > Possible-Values-With".
    > Do you think this is going to come back to bite me? Is there some
    > "legal" way to alter that parameter's value?

    Yes, just alter it like any other attribute, but with the option set to
    allow schema changes (see the schema page).

    > As usual, I appreciate you and any time you will kindly take to
    > consider and answer my question.

    You seem to be understanding the issue and solution well.

    Andrew Bartlett

    Andrew Bartlett                       https://samba.org/~abartlet/
    Authentication Developer, Samba Team  https://samba.org
    Samba Developer, Catalyst IT

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