6ae35534b7
Previously it was not possible to open a local store when its database is on a read-only filesystem. Obviously a store on a read-only filesystem cannot be modified, but it would still be useful to be able to query it. This change adds a new read-only setting to LocalStore. When set to true, Nix will skip operations that fail when the database is on a read-only filesystem (acquiring big-lock, schema migration, etc), and the store database will be opened in immutable mode. Co-authored-by: Ben Radford <benradf@users.noreply.github.com> Co-authored-by: cidkidnix <cidkidnix@protonmail.com> Co-authored-by: Dylan Green <67574902+cidkidnix@users.noreply.github.com> Co-authored-by: John Ericson <git@JohnEricson.me> Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
42 lines
1.7 KiB
Bash
42 lines
1.7 KiB
Bash
source common.sh
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enableFeatures "read-only-local-store"
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needLocalStore "cannot open store read-only when daemon has already opened it writeable"
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clearStore
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happy () {
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# We can do a read-only query just fine with a read-only store
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nix --store local?read-only=true path-info $dummyPath
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# We can "write" an already-present store-path a read-only store, because no IO is actually required
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nix-store --store local?read-only=true --add dummy
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}
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## Testing read-only mode without forcing the underlying store to actually be read-only
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# Make sure the command fails when the store doesn't already have a database
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expectStderr 1 nix-store --store local?read-only=true --add dummy | grepQuiet "database does not exist, and cannot be created in read-only mode"
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# Make sure the store actually has a current-database, with at least one store object
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dummyPath=$(nix-store --add dummy)
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# Try again and make sure we fail when adding a item not already in the store
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expectStderr 1 nix-store --store local?read-only=true --add eval.nix | grepQuiet "attempt to write a readonly database"
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# Test a few operations that should work with the read-only store in its current state
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happy
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## Testing read-only mode with an underlying store that is actually read-only
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# Ensure store is actually read-only
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chmod -R -w $TEST_ROOT/store
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chmod -R -w $TEST_ROOT/var
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# Make sure we fail on add operations on the read-only store
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# This is only for adding files that are not *already* in the store
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expectStderr 1 nix-store --add eval.nix | grepQuiet "error: opening lock file '$(readlink -e $TEST_ROOT)/var/nix/db/big-lock'"
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expectStderr 1 nix-store --store local?read-only=true --add eval.nix | grepQuiet "Permission denied"
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# Test the same operations from before should again succeed
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happy
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