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    Lab 32.1 issue with diff

    Posts: 51
    in LFS207 Class Forum

    Hi,

    In the lab 32.1, diff claims that the directory doesn't exist with some python related message. However it actually exists:

    1. ┌──(alu@nb)-[/tmp]
    2. └─$ ls restore/
    3. include
    4.  
    5. ┌──(alu@nb)-[~]
    6. └─$ diff -r /tmp/restore/include/ /usr/include/
    7. diff: /tmp/restore/include/python3.11/numpy: No such file or directory

    I tried the diff command with two test dirs without an issue:

    1. ┌──(alu@nb)-[/tmp]
    2. └─$ ls test1 test2
    3. test1:
    4. sub1  test.txt
    5.  
    6. test2:
    7. test.txt
    8.  
    9. ┌──(alu@nb)-[/tmp]
    10. └─$ diff -r /tmp/test1 /tmp/test2
    11. Only in /tmp/test1: sub1
    12. diff '--color=auto' -r /tmp/test1/test.txt /tmp/test2/test.txt
    13. 1d0
    14. < xxx

    So, the diff command as such works as expected.

    Where does this issue come from?

    Thanks,
    Urs

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    Answers

    • Posts: 1,270

      Hi Urs,

      I checked on the labs file and Lab 32.1 is about another thing. Are you sure about the chapter and section?

      Regards,
      Luis.

    • Posts: 51

      Hi Luis,

      Yes, it's about backup and restore with tar. At the very end of Lab 32.1, step 4:
      "4. Compare the contents with the original directory the archive was made from."

      diff is used to compare the contents of the original /usr/includes directory, with the restored one. The solution suggests:
      $ diff -qr include /usr/include

      Regards,
      Urs

    • Posts: 51

      @albiurs said:
      Hi Luis,

      Yes, it's about backup and restore with tar. At the very end of Lab 32.1, step 4:
      "4. Compare the contents with the original directory the archive was made from."

      diff is used to compare the contents of the original /usr/includes directory, with the restored one. The solution suggests:
      $ diff -qr include /usr/include

      Regards,
      Urs

      ...This is the Link to the Lab:
      https://trainingportal.linuxfoundation.org/learn/course/linux-system-administration-essentials-lfs207/backup-and-recovery-methods/lab-exercises?page=1

    • Posts: 1,270

      Hi Urs,

      I got it. So, I went over Lab 32.1 on Ubuntu 24.04 and it worked fine for me. The diff tool didn't report any issue and the output for the command was empty, as expected:

      ubuntu@master:/tmp/backup/restore/usr$ diff -qr include/ /usr/include/
      ubuntu@master:/tmp/backup/restore/usr$

      Per the man page, the 'q' parameter reports only when files differ. And 'r' is for 'recursive'.

      What OS and version are you using?

      Regards,
      Luis.

    • Posts: 51
      edited November 2024

      Hi Luis,

      I'm on Debian 12:

      1. ┌──(alu@nb)-[~]
      2. └─$ cat /etc/os-release 
      3. PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
      4. NAME="Debian GNU/Linux"
      5. VERSION_ID="12"
      6. VERSION="12 (bookworm)"
      7. VERSION_CODENAME=bookworm
      8. ID=debian
      9. HOME_URL="https://www.debian.org/"
      10. SUPPORT_URL="https://www.debian.org/support"
      11. BUG_REPORT_URL="https://bugs.debian.org/"
      12.  
      13. ┌──(alu@nb)-[~]
      14. └─$ uname -a
      15. Linux nb 6.1.0-27-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01) x86_64 GNU/Linux

      I just tried it again with the same python error on this system. But now I also tried it on a Ubuntu VM where I don't get this error too. So I think it must be an issue of my Debian machine...

      By the way what means:
      #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1?

      Thanks,
      Urs

    • Posts: 1,270

      Hi Urs,

      I just tried it again with the same python error on this system. But now I also tried it on a Ubuntu VM >where I don't get this error too. So I think it must be an issue of my Debian machine...

      Yep, it seems to be related to that system or that OS/version in particular.

      By the way what means:

      1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1?

      It indicates that the kernel has support for SMP dynamic preemption.

      Regards,
      Luis.

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