Keep mise runtime installs and locks together - #55
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Amp-Thread-ID: https://ampcode.com/threads/T-01a08b36-412a-7613-9dc3-7ae95b831124 Co-authored-by: Amp <amp@ampcode.com>
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Why
Mise stores install-state markers and locks in its cache directory. When its cache is shared but its data directories are not, concurrent importer installs can mark another process's valid private installation as incomplete. Mise then omits
buildkite-ghafromPATHand fails withcouldn't exec process: No such file or directory.This exact failure was reproduced with mise 2026.8.3. The retained hosted-agent incident did not record its resolved cache path, so the reproduction establishes the failure mechanism rather than proving it was the incident's unique cause.
What
Derive
MISE_CACHE_DIRfrom the plugin-selectedMISE_DATA_DIR, keeping the installation tree and its coordination state on the same lifecycle. The focused Bats assertion prevents an inherited independent cache directory from reintroducing the split.