(t) Samba shares not accessible - 5.0.6-0 & 5.0.7-0 #2794

[phillxnet]

Introduce 'poetry-plugin-dotenv' to enable Poetry to establish environmental variables from a .env file. Add PASSWORD_STORE_DIR & DJANGO_SETTINGS_MODULE variables to inform OS level 'password-store' app, & our .venv Django of their configuration.

Fixes #2794

Includes:

• Additional logging to poetry-install.txt to indicate plugins installed.
• Include new .env file in project.toml for sdist inclusion.
• NO SECRETS indicator in new .env file.
• Add source .env to build.sh to ease development, the .env file is also read by build.sh's dedicated rockstor-build.service.
• Pin, in build.sh, poetry-plugin-dotenv to latest 0.6.11
• Adopt new poetry run mnt-share share-name, with required cd, in new root preexec Samba share config creation.
• Incidentally fix legacy Poetry removal regression introduced when build.sh execution was moved to a systemd service from rpm %posttrans.
• Add smb.conf preexec migration procedure to initrock.
• Remove redundant smb & nmb restarts from prior preexec migrations.
• Resource .env file in all relevant rockstor*.service files via EnvironmentFile= directive.
• Normalise on /usr/local/bin/poetry run script invocation in all relevant rockstor*.service files.
• Modify developer instructions (build.sh) to account for new poetry-plugin-dotenv.

---

Caveat

This does not address the following similar preexec failure observed (without clear cause) using 15.5 on both client & host.

smbclient --version
Version 4.17.12-git.455.b299ac1e60150500.3.20.1SUSE-oS15.0-x86_64
smbclient //192.168.2.234/test_share01 -U radmin --password=pass
tree connect failed: NT_STATUS_ACCESS_DENIED

With the following samba host side log in /var/log/samba/log.philip-mg i.e. client hostname specific log on rockstor server.

[2024/02/06 11:45:03.514875,  1] ../../source3/smbd/smb2_service.c:706(make_connection_snum)
  root preexec gave 83 - failing connection

The following issue, with as yet undetermined cause, has been created to address this caveat:
Samba: root preexec gave 83 - failing connection #2798

[phillxnet]

Testing

Following the same test procedure as detailed in this pull request's prior draft version:
#2796 (comment)
we have the same outcome, i.e. existing shares migrated successfully to the new format. And a continuity from last stable to current testing with this PR pre-merged.

An additional test to confirm new SMB exports are as intended also succeeded:

smbclient //192.168.2.105/test_share02 -U radmin --password=pass
Try "help" to get a list of possible commands.
smb: \> mkdir pr2797
smb: \> ls
  .                                   D        0  Thu Feb  8 14:49:20 2024
  ..                                  D        0  Thu Feb  8 14:47:34 2024
  pr2797                              D        0  Thu Feb  8 14:49:20 2024

                7864320 blocks of size 1024. 5233152 blocks available
smb: \> q