podman

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Matt Heon b320fbcaff Add migration code for BoltDB to SQLite

This is gated behind a new option in `podman system migrate`,
`--migrate-db`.

The basic logic is simple:
* Podman is already configured to use BoltDB
* Open a new, fresh SQLite database to write into
* Migrate all database contents as they exist in BoltDB, to
  SQLite.
** Do this as simply as possible: grab the object from the old DB
   and write it into the new DB using the standard Add and Save
   functions.
* Set the new database in the Runtime, close the old one.
* Move the old database file so it won't be reused
* Show a warning if the user explicitly configured BoltDB in
  containers.conf

Our ability to test complex migration scenarios is limited, but
this should handle simple migrations easily.

Fixes #27628

Signed-off-by: Matt Heon <matthew.heon@pm.me>

2026-02-05 20:09:37 -05:00