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usrmerge on root NFS will not be run automatically

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  usrmerge on root NFS will not be run automatically Marco <lists@homerow.info> - 2023-09-08 13:10 +0200
    Re: usrmerge on root NFS will not be run automatically zithro <slack@rabbit.lu> - 2023-09-08 17:00 +0200
      Re: usrmerge on root NFS will not be run automatically Marco <lists@homerow.info> - 2023-09-08 18:10 +0200
    Re: usrmerge on root NFS will not be run automatically Stefan Monnier <monnier@iro.umontreal.ca> - 2023-09-08 18:50 +0200

#261558 — usrmerge on root NFS will not be run automatically

Hi,

I'm in the process of upgrading my Debian stable hosts and run into
a problem with usrmerge:

  Setting up usrmerge (35) ...

  Warning: NFS detected, /usr/lib/usrmerge/convert-usrmerge will not be run
  automatically. See #842145 for details.

  E: usrmerge failed.
  dpkg: error processing package usrmerge (--configure):
   installed usrmerge package post-installation script subprocess returned error exit status 1
  Errors were encountered while processing:
   usrmerge
  E: Sub-process /usr/bin/dpkg returned an error code (1)

True, root is mounted via NFS. So I ran usrmerge manually:

  root@foobar:~# /usr/lib/usrmerge/convert-usrmerge 

  FATAL ERROR:
  Both /lib/udev/rules.d/60-libsane1.rules and /usr/lib/udev/rules.d/60-libsane1.rules exist.

  You can try correcting the errors reported and running again
  /usr/lib/usrmerge/convert-usrmerge until it will complete without errors.
  Do not install or update other Debian packages until the program
  has been run successfully.

It instructs me to:

  You can try correcting the errors reported and running again

But it's not mentioned anywhere *how* to correct those errors. It's
true that both files exist. I've read

  https://wiki.debian.org/UsrMerge

But the page doesn't cover the error I face.

How to fix the error? Is there a command I can run (e.g. rsync?) to
fix whatever usrmerge complains about? Like keeping only the newest
file or deleting the old one? I feel there's very little info out
there how to recover from this situation. Any tips are much
appreciated.

Marco

Debian stable 6.1.0-11-amd64

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#261559

On 08 Sep 2023 12:54, Marco wrote:
>    Warning: NFS detected, /usr/lib/usrmerge/convert-usrmerge will not be run
>    automatically. See #842145 for details.

Read :
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842145
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1039522

The solution would be :
"convert-usrmerge can be run in a chroot on the NFS server"

If your NFS server is not Linux-based, carefully copy the files over a 
Linux machine, chroot+convert there, then move back to the NFS server.
Make backups ;)
Can help: 
https://unix.stackexchange.com/questions/312218/chroot-from-freebsd-to-linux


As per the why, I don't know.
Maybe the symlink handling by NFS ?

Reading the script "/usr/lib/usrmerge/convert-usrmerge", you get the 
reasons why it fails :

142     # The other cases are more complex and there are some corner 
cases that
143     # we do not try to resolve automatically.
144
145     # both source and dest are links
[...]
168     # the source is a link
[...]
175     # the destination is a link
[...]
191     # both source and dest are directories
192     # this is the second most common case

You may change the script to detect where/why it fails, so edit
     fatal("Both $n and /usr$n exist");
to
     fatal("Both $n and /usr$n exist - err line 145");
     fatal("Both $n and /usr$n exist - err line 168");

Also found this on
"https://en.opensuse.org/openSUSE:Usr_merge#Known_Problems" :

- "File systems that do not support RENAME_EXCHANGE such as ZFS or NFS 
cannot perform live conversion (Bug 1186637)"
- "Conversion fails if there's a mount point below 
(/usr)/{bin,sbin,lib,lib64}"

Good luck

-- 
++
zithro / Cyril

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#261560

On Fri, 8 Sep 2023 16:55:23 +0200
zithro <slack@rabbit.lu> wrote:

> On 08 Sep 2023 12:54, Marco wrote:
> >    Warning: NFS detected, /usr/lib/usrmerge/convert-usrmerge will
> > not be run automatically. See #842145 for details.  
> 
> Read :
> - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842145

  “I repeated it a few times. I had to restart various services in between
  retries (I think I restarted everything by the end). Eventually it
  succeeded.”

I tried it 30 times to no avail. The report doesn't offer another
solution.

> - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1039522

  “instead of converting the client, convert the server first.”

I don't want to convert the server. The server is running fine and
has no issues. I don't have a clue what this has to do with the
server.

  “So there is a workaround when your NFS server is a Linux machine
  and you may use chroot on it, at least.”

The server doesn't run Linux. So also no solution there.

> carefully copy the files over a Linux machine, chroot+convert
> there, then move back to the NFS server.

That is quite an involved task. I didn't expect such fiddling for a
simple OS update. I'm a bit worried that the permissions and owners
go haywire when I copy stuff directly off the server onto a VM and
back onto the server. Is there a recommended procedure or
documentation available?

> Can help: 
> https://unix.stackexchange.com/questions/312218/chroot-from-freebsd-to-linux

I cannot install stuff on the server unfortunately.

Thanks for your quick reply.

Marco

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#261561

>   root@foobar:~# /usr/lib/usrmerge/convert-usrmerge 
>
>   FATAL ERROR:
>   Both /lib/udev/rules.d/60-libsane1.rules and /usr/lib/udev/rules.d/60-libsane1.rules exist.

The problem is that "usrmerge" needs to unify those two and doesn't
know how.  So you need to do it by hand.
E.g. get rid of one of those two (or maybe if you can make
them 100% identical `usrmerge` will be happy as well).


        Stefan

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