Cache and cloud settings

Updated Aug 02, 2026

Cargo home

CARGO_HOME
Default: ${HOME}/.cargo
Cargo home directory used by Rust tooling and Kopia cache restore.

Kopia cargo cache

Set KOPIA_BUCKET to enable Kopia-backed cargo cache restore and snapshot. The system phase installs the kopia package when this is set. The home phase connects to the repository, restores the cache, and snapshots it again after tool installation.

KOPIA_BUCKET
S3 bucket name.
KOPIA_CREATE
Default: 0
Set to 1 to create the Kopia repository before connecting.
KOPIA_ENDPOINT
S3-compatible endpoint.
KOPIA_REGION
S3 region.
AWS_ACCESS_KEY_ID
Access key passed to Kopia.
AWS_SECRET_ACCESS_KEY
Secret key passed to Kopia.

`sccache`

Set SCCACHE_BUCKET to install and configure sccache for Rust builds.

SCCACHE_BUCKET
Enables sccache setup.
SCCACHE_WEBDAV_ENDPOINT
Optional WebDAV endpoint for sccache.
SCCACHE_VERSION
Version of sccache to install.