Gettting s backup file (ods )version

[Tommi Prami]

Yellow,

I've treid how to get ods-version _only_ of backup. Can minimize restore it elf by restoring the metadata only, but it takes quite a while still.

Little background. If our appo starts to do a restore, it needs to know is original backup 2.5.x or fb4.x or newer (for now at least). If it is older backup, made with FB2.5 I need to find out that before restore, so I can switch process/code path, and then restore it with fb2.5 embedded, and then do database structure update, so it is compatible with FB4+

I could do it with something like :

gbak -replace fb25x.fbk unique_temp_db_name.fbd -z -meta_data

And get what gbak echoes into the "Command prompt", and parse ods-version from that, it just takes a few seconds to find out, which I would hope it to take only millisecond or maybe few.

Is there a solution for that? if not, maybe make such a feature for FB 5x

-Tee-

[Сергей Волков]

Hi.

The description of the headers of the backup file in kaitai format is here. With kaitai struct compiler, they can be converted into a class for a programming language. Usage example in view_gbak.py.

Also read 1 byte at offset 3 (usually there is a version). 

Version matching (firebird / backup format):

2.5 = 9
3.0 = 10
4.0 = 11

ср, 14 сент. 2022 г. в 10:27, Tommi Prami <tommi...@gmail.com>:

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[Tommi Prami]

Thanks... 

Can someone make C-structure with that Python thingy, might take quite a while to install and learn how to use it... I could then port it to my needs (Delphi/Pascal, maybe)

That Offset byte could be enough...

-Tee-

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