Raito Bezarius
1e98c01912
Nix daemon runs in a service context, usually with systemd. If the Nix daemon unit adds `[Service] CacheDirectory=nix-daemon`, it should successfully use `/var/cache/nix-daemon` automatically. Instead, it uses `/root/.cache` right now, which is really bad. By default, we add `[Service] CacheDirectory=nix` now which means that caches are moved into `/var/cache/nix`. Fixes #634. Change-Id: I854b1045bfdce8f60110aea70bda1bf6657dfd7b Signed-off-by: Raito Bezarius <raito@lix.systems>
32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
---
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synopsis: "Move /root/.cache/nix to /var/cache/nix by default"
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cls: [4671]
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issues: [fj#634]
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category: "Breaking Changes"
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credits: [raito]
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---
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By default, Lix attempts to locate a cache directory for its operations (such
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as the narinfo cache) by checking the value of `$XDG_CACHE_DIR`.
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However, since the Nix daemon is a system service, using `$XDG_CACHE_DIR` is
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not typical in this context.
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To address this, systemd provides a better solution. Specifically, when
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`CacheDirectory=` is set in the `[Service]` section of a systemd unit, it
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automatically sets the `$CACHE_DIRECTORY` environment variable and systemd will
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manage that cache directory for us.
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Now, our systemd unit includes `CacheDirectory=nix`, which sets the
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`$CACHE_DIRECTORY` and takes precedence over `$XDG_CACHE_DIR`.
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If the daemon is run under user units, systemd will automatically set
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`$XDG_CACHE_DIR`.
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If neither of these variables is set, Lix falls back to its default behavior.
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By default, Lix will try to find a cache directory for its various operations
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(e.g. narinfo cache) by looking into `$XDG_CACHE_DIR`.
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In summary, what was stored in `/root/.cache/nix` is now moved to
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`/var/cache/nix/nix`.
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