Bug reported in the community forum[0].
Currently, it's possible to break replication by:
1. have an existing snapshot whose name contains an uppercase letter
2. set up a replication job and run it
3. rollback to the existing snapshot
4. replicate again -> fails
The failure occurs, because after step 3, the most recent common snapshot is the
previously existing one and currently no uppercase letters are allowed for
export/import.
The pve-snapshot-name option uses the CONFIGID_RE
qr/[a-z][a-z0-9_-]+/i
so it cannot be used here, because it would not allow for e.g. '__migrate__'.
Simply allow uppercase letters, to be backwards compatible and allow all
possible pve-snapshot-name values.
There is still an issue if there also was state volume, but that's a different
bug[1].
[0]: https://forum.proxmox.com/threads/solved-migration-error-base-value-does-not-match-the-regex-pattern.85946/
[1]: https://bugzilla.proxmox.com/show_bug.cgi?id=3111
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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