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Ben Radford 2023-06-15 13:36:28 +01:00
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2 changed files with 12 additions and 16 deletions
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14
src/libstore/local-store.hh
View file

@ -52,14 +52,14 @@ struct LocalStoreConfig : virtual LocalFSStoreConfig
R"(
Allow this store to be opened when its [database](@docroot@/glossary.md#gloss-nix-database) is on a read-only filesystem.
Normally Nix will attempt to open the store database in read-write mode, even
for querying (when write access is not needed). This causes it to fail if the
database is on a read-only filesystem.
Normally Nix will attempt to open the store database in read-write mode, even for querying (when write access is not needed).
This causes it to fail if the database is on a read-only filesystem.
Enable read-only mode to disable locking and open the SQLite database with the
[`immutable` parameter](https://www.sqlite.org/c3ref/open.html) set. Do not use this unless the filesystem is read-only.
Using it when the filesystem is writable can cause incorrect query results or
corruption errors if the database is changed by another process.
Enable read-only mode to disable locking and open the SQLite database with the [`immutable` parameter](https://www.sqlite.org/c3ref/open.html) set.
**Warning**
Do not use this unless the filesystem is read-only.
Using it when the filesystem is writable can cause incorrect query results or corruption errors if the database is changed by another process.
)"};
const std::string name() override { return "Local Store"; }

14
src/libutil/experimental-features.cc
View file

@ -220,17 +220,13 @@ constexpr std::array<ExperimentalFeatureDetails, 14> xpFeatureDetails = {{
.description = R"(
Allow the use of the `read-only` parameter in local store URIs.
Set this parameter to `true` to allow stores with databases on read-only
filesystems to be opened for querying; ordinarily Nix will refuse to do this.
Set this parameter to `true` to allow stores with databases on read-only filesystems to be opened for querying; ordinarily Nix will refuse to do this.
This is because SQLite requires write access to the database file to perform
the file locking operations necessary for safe concurrent access. When `read-only`
is set to `true`, the database will be opened in immutable mode.
This is because SQLite requires write access to the database file to perform the file locking operations necessary for safe concurrent access.
When `read-only` is set to `true`, the database will be opened in immutable mode.
Under this mode, SQLite will not do any locking at all, so you should be certain
that the database will not be changed. While the filesystem the database resides
on might be read-only to this process, consider whether another user, process,
or system, might have write access to it.
Under this mode, SQLite will not do any locking at all, so you should be certain that the database will not be changed.
While the filesystem the database resides on might be read-only to this process, consider whether another user, process, or system, might have write access to it.
)",
},
}};