lsb-release and unattended upgrades issue

[bin]

I have used unattended upgrades on various distros since 2013, normally no problems

In order to keep things under control when Debian releases change I use the codename option. That keeps it contained to a specific version.

However, with Sparky:-
Operating System: SparkyLinux 5.12 (Nibiru)
Kernel: Linux 4.19.0-9-amd64
Architecture: x86-64

I have found a bit of a problem.

/etc/lsb-release shows

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DISTRIB_ID=Sparky
DISTRIB_RELEASE=5.12
DISTRIB_CODENAME=Nibiru
DISTRIB_DESCRIPTION="SparkyLinux"


If I run lsb-release -a I get

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No LSB modules are available.
Distributor ID: Sparky
Description: SparkyLinux 5.12 (Nibiru)
Release: 5.12
Codename: sid

If I run unattended upgrades using codename all the origins come back as sid

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sudo unattended-upgrades --verbose --dry-run
Initial blacklist :
Initial whitelist:
Starting unattended upgrades script
Allowed origins are: origin=Debian,codename=sid-updates, origin=Debian,codename=sid-proposed-updates, origin=Debian,codename=sid,label=Debian, origin=Debian,codename=sid,label=Debian-Security


But then I run

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$ cat /etc/debian_version
buster/sid

So, that's my puzzle.

Is this some carryover from the development process when 5.xx actually was based on sid?

[bin]

OK - just to square the circle this is the relevant section from 50unattended-upgrades that actually works OK on niburu

The core line was unusual - normally don't need both n and a values.

NOTE the grub exclusion following the recent silliness with UA and grub breaking boot process.

Unattended-Upgrade::Origins-Pattern {
        // Codename based matching:
        // This will follow the migration of a release through different
        // archives (e.g. from testing to stable and later oldstable).
        // Software will be the latest available for the named release,
        // but the Debian release itself will not be automatically upgraded.
//      "origin=Debian,codename=${distro_codename}-updates";
//      "origin=Debian,codename=${distro_codename}-proposed-updates";
//      "origin=Debian,codename=${distro_codename},label=Debian";
//      "origin=Debian,codename=${distro_codename},label=Debian-Security";

        // Archive or Suite based matching:
        // Note that this will silently match a different release after
        // migration to the specified archive (e.g. testing becomes the
        // new stable).

        "o=Debian,n=buster";
        "o=Debian,n=buster-updates";
        "o=Debian,n=buster,l=Debian-Security";
        "o=SparkyLinux,n=nibiru";
        "o=SparkyLinux,n=core,a=core";
        "o=Unofficial Multimedia Packages,n=buster";
//     ****"o=Google LLC,a=stable"; - not yet used check
//     ****"o=Debian Backports,a=buster-backports"; - not yet used check

};

// Python regular expressions, matching packages to exclude from upgrading
Unattended-Upgrade::Package-Blacklist {
    // The following matches all packages starting with linux-
//  "linux-";
    "grub";
    "grub-";
    // Use $ to explicitely define the end of a package name. Without
    // the $, "libc6" would match all of them.
//  "libc6$";
//  "libc6-dev$";
//  "libc6-i686$";