c4: Check available disk space earlier during update

Detail name	Value
Changelog Number	26704
Type	Bug
Status	Resolved
Affected Versions	Exasol 8.0.0
Fix Versions	Exasol 2026.1.0, Exasol 2025.1.11, C4 4.29.6, C4 4.28.8
Resolution Date	2026-04-30

Description

In some update scenarios, the system did not validate available disk space early enough. As a result, an update could start even when there was not enough free space to unpack and apply artifacts, which could lead to a failure later in the process.

Workaround

There is no workaround.

Fix

Implemented a check for disk space earlier in the update procedure, to prevent failed update attempts. This change is particularly relevant for host deployment scenarios and includes more accurate validation as part of the update process.