juergbi commented on issue #2021:
URL: https://github.com/apache/buildstream/issues/2021#issuecomment-2965217461
The cache is the local BuildStream/BuildBox cache for CAS objects, used for
sources as well as build artifacts. The default configuration reserves 5% of
disk space to prevent a large cache filling up the whole disk.
The default is intentionally conservative but it's definitely not suitable
for all environments. Maybe we can improve that. And we should definitely make
the error message more helpful.
You can create a `~/.config/buildstream.conf` file with, e.g.
```
cache:
reserved-disk-space: 5G
```
to instruct BuildStream to keep only 5G free on that partition. Or specify a
lower percentage.
You can also set `cachedir` (as top-level key) if you want the cache on a
different path/partition.
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