BuildToolChain/COURTESY.md

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Source Cache and Upstream Courtesy Policy
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Automated bulk retrieval of source archives places measurable load on upstream
hosting infrastructure — GNU FTP mirrors, kernel.org, and similar services are
public resources funded and maintained by their respective communities.
Uncontrolled repeated downloads from build scripts and CI pipelines constitute a
denial-of-service risk against these mirrors.
BTC.sh mitigates this by maintaining a persistent local source cache under
/opt/BTC/sources/. Once a tarball is fetched, it is retained for all subsequent
build invocations. The build will not re-download an archive that already
exists in the cache and passes integrity verification.
Users and integrators are expected to honor this policy:
1. Preserve the local source cache between builds. Do not routinely purge
/opt/BTC/sources/ unless disk recovery is necessary.
2. Avoid wrapping BTC.sh in loops or CI jobs that discard the cache on
each run. If transient storage is required, mirror the cache directory
to persistent media between invocations.
3. When operating behind a mirror or proxy, configure it to cache source
archives in accordance with the same principles.
4. Respect upstream rate limits and mirror redistribution policies.
These projects provide critical infrastructure at no cost; responsible
consumption ensures their continued availability.
This policy aligns with the broader ethic of clean infrastructure:
self-sufficiency includes responsible stewardship of shared resources.