Moving from 14.1 or 14.0 Freebsd Kernel source code /usr/src to 15.0 current

 Moving from 14.1 or 14.0 Freebsd Kernel source code /usr/src to 15.0 current

 move over old source code 

su - ; mv /usr/src /usr/14.1_src

Does not work It is a ZFS set use ZFS rename
 
 
 root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # mv -i src src14.1
mv: rename src to src14.1: Operation not supported
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs list
NAME                                              USED  AVAIL  REFER  MOUNTPOINT
arm64pool                                         406G   401G    96K  /arm64pool
arm64pool/ROOT                                    355G   401G    96K  none
arm64pool/ROOT/default                            355G   401G   354G  /
arm64pool/ROOT/freds_first                         56K   401G   982M  /
arm64pool/boot                                   57.7M   401G  57.7M  /boot
arm64pool/etc                                    1.97M   401G  1.97M  /etc
arm64pool/home                                    417M   401G   417M  /home
arm64pool/poudriere                              7.91G   401G   104K  /arm64pool/poudriere
arm64pool/poudriere/jails                        3.61G   401G    96K  /arm64pool/poudriere/jails
arm64pool/poudriere/jails/ghostbsd-13-2-aarch64  2.29G   401G  2.16G  /usr/local/poudriere/jails/ghostbsd-13-2-aarch64
arm64pool/poudriere/jails/ghostbsd-14-aarch64    1.32G   401G  1.32G  /usr/local/poudriere/jails/ghostbsd-14-aarch64
arm64pool/poudriere/ports                        4.30G   401G    96K  /arm64pool/poudriere/ports
arm64pool/poudriere/ports/default                 980M   401G   980M  /usr/local/poudriere/ports/default
arm64pool/poudriere/ports/ghostbsd_ports         3.35G   401G  3.35G  /usr/local/poudriere/ports/ghostbsd_ports
arm64pool/tftpboot                                824M  4.20G   824M  /tftpboot
arm64pool/tmp                                     144K   401G   144K  /tmp
arm64pool/usr                                    34.7G   401G    96K  /usr
arm64pool/usr/ports                              30.5G   401G  30.5G  /usr/ports
arm64pool/usr/src                                2.44G   401G  2.44G  /usr/src
arm64pool/usr/src-old                            1.78G   401G  1.78G  /usr/src-old
arm64pool/var                                    6.93G   401G    96K  /var
arm64pool/var/audit                                96K   401G    96K  /var/audit
arm64pool/var/ccache                             6.92G   401G  6.92G  /var/ccache
arm64pool/var/crash                                96K   401G    96K  /var/crash
arm64pool/var/log                                8.54M   401G  8.54M  /var/log
arm64pool/var/mail                               5.51M   401G  5.51M  /var/mail
arm64pool/var/tmp                                 112K   401G   112K  /var/tmp
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs rename arm64pool/usr/src arm64pool/usr/src-14.1
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs list | grep src
arm64pool/usr/src-14.1                           2.44G   401G  2.44G  /usr/src
arm64pool/usr/src-old                            1.78G   401G  1.78G  /usr/src-old
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # 


EXAMPLES
   Example 1: Creating a ZFS File System Hierarchy
     The following commands create a file system named pool/home and a file
     system named pool/home/bob.  The mount point /export/home is set for the
     parent file system, and is automatically inherited by the child file
     system.
           # zfs create pool/home
           # zfs set mountpoint=/export/home pool/home
           # zfs create pool/home/bob

No manual entry for get

root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs get mountpoint /usr/src
NAME                    PROPERTY    VALUE       SOURCE
arm64pool/usr/src-14.1  mountpoint  /usr/src    local
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs get mountpoint arm64pool/usr/src-14.1
NAME                    PROPERTY    VALUE       SOURCE
arm64pool/usr/src-14.1  mountpoint  /usr/src    local
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs set mountpoint='/usr/src-14.1' arm64pool/usr/src-14.1
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs get mountpoint arm64pool/usr/src-14.1
NAME                    PROPERTY    VALUE          SOURCE
arm64pool/usr/src-14.1  mountpoint  /usr/src-14.1  local
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr #

 
zfs create   
 
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs set mountpoint='/usr/src-14.1' arm64pool/usr/src-14.1
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs get mountpoint arm64pool/usr/src-14.1
NAME                    PROPERTY    VALUE          SOURCE
arm64pool/usr/src-14.1  mountpoint  /usr/src-14.1  local
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # zfs create arm64pool/usr/src
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # ls -l
total 325
drwxr-xr-x   2 root wheel    486 Sep 22  2023 bin
-rw-r--r--   1 root wheel 103016 Sep  5  2021 Free_Test_Data_100KB_MP3.mp3
drwxr-xr-x   9 root wheel     10 Sep 19 09:49 ghost14
drwxr-xr-x   4 root wheel      6 Sep 27 06:30 ghost24
drwxr-xr-x  28 root wheel     73 Jan 17  2024 ghostbsd-src
drwxr-xr-x  56 root wheel    354 Sep 22  2023 include
drwxr-xr-x  11 root wheel    574 Sep 22  2023 lib
drwxr-xr-x   9 root wheel    597 Sep 22  2023 lib32
drwxr-xr-x   5 root wheel      5 Jul  6  2023 libdata
drwxr-xr-x  11 root wheel     69 Sep 22  2023 libexec
drwxr-xr-x  21 root wheel     22 Sep 27 15:14 local
drwxr-xr-x   3 root wheel      4 May 11  2024 netbsd
drwxr-xr-x   3 root wheel      3 Aug  7  2023 obj
drwxr-xr-x   3 root wheel      3 Mar 25  2024 openbsd
-rw-r--r--   1 root wheel  47621 Jul 31  2023 patch_vchiq_D37878_diff.txt
drwxr-xr-x   2 root wheel      5 Jan 22  2024 Patches
drwxr-xr-x  70 root wheel     83 Dec 22 19:29 ports
drwxr-xr-x   3 root wheel      3 Feb  2  2024 ports_orig
drwxr-xr-x   4 root wheel      8 Jan 15  2024 repos
drwxr-xr-x   2 root wheel    280 Sep 22  2023 sbin
drwxr-xr-x  33 root wheel     33 Jul  6  2023 share
drwxr-xr-x   2 root wheel      2 Feb 17 06:55 src
drwxr-xr-x  28 root wheel     48 Jan  6 03:32 src-14.1
drwxr-xr-x  29 root wheel     73 Sep 21 16:42 src-old
drwxr-xr-x  18 root wheel     23 Sep 22  2023 tests
 
 
 
 
https://github.com/freebsd
cd /usr  ;  git clone https://github.com/freebsd/freebsd-src.git /usr/src
 
better explanation of updating /usr/src
zfs-rename(8) renames ZFS datasets, not mount points. The correct way to rename /usr/src would be:

zfs rename zroot/usr/src zroot/usr/src-no
  
sudo  git clone --branch releng/13.1 https://git.freebsd.org/src.git /usr/src

https://forums.freebsd.org/threads/installing-and-updating-the-src-tree-with-git.78367/

Documentation on using GIT for freeBSD
https://forums.freebsd.org/threads/guide-using-git-to-manage-ports-source-and-documentation.79721/
 

root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # ls -ld /usr/src*
drwxr-xr-x   2 root wheel  2 Feb 17 06:55 /usr/src
drwxr-xr-x  28 root wheel 48 Jan  6 03:32 /usr/src-14.1
drwxr-xr-x  29 root wheel 73 Sep 21 16:42 /usr/src-old
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # sudo  git clone --branch releng/15.0 https://git.freebsd.org/src.git /usr/src
Cloning into '/usr/src'...
fatal: Remote branch releng/15.0 not found in upstream origin
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # ls
bin                libexec                repos
Free_Test_Data_100KB_MP3.mp3    local                sbin
ghost14                netbsd                share
ghost24                obj                src
ghostbsd-src            openbsd                src-14.1
include                patch_vchiq_D37878_diff.txt    src-old
lib                Patches                tests
lib32                ports
libdata                ports_orig
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # du -hs src src-14.1 src-old
512B    src
2.5G    src-14.1
1.8G    src-old
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr #

root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # sudo  git clone --branch main https://git.freebsd.org/src.git /usr/src
Cloning into '/usr/src'...
remote: Enumerating objects: 4616300, done.
remote: Counting objects: 100% (487499/487499), done.
remote: Compressing objects: 100% (108194/108194), done.
remote: Total 4616300 (delta 439816), reused 393239 (delta 377390), pack-reused 4128801 (from 1)
Receiving objects: 100% (4616300/4616300), 1.78 GiB | 9.50 MiB/s, done.
Resolving deltas: 100% (3649346/3649346), done.
Updating files: 100% (103103/103103), done.
#
Updating files: 100% (103103/103103), done.
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # date
Mon Feb 17 07:44:50 UTC 2025
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # df -h /usr/src
Filesystem           Size    Used   Avail Capacity  Mounted on
arm64pool/usr/src    401G    2.5G    398G     1%    /usr/src
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr # du -hs /usr/src
2.5G    /usr/src
root@Ghost14-selfbuilt-rpi4B-nginx-tst1:/usr #

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