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Support opening local store with database on read-only filesystem (#8356)

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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>
This commit is contained in:
Ben Radford 2023-06-20 10:34:09 +01:00 • committed by GitHub
parent 3910430b9d
commit 6ae35534b7
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9 changed files with 144 additions and 16 deletions
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5
src/libstore/gc.cc
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@ -110,6 +110,11 @@ void LocalStore::createTempRootsFile()
void LocalStore::addTempRoot(const StorePath & path)
{
if (readOnly) {
debug("Read-only store doesn't support creating lock files for temp roots, but nothing can be deleted anyways.");
return;
}
createTempRootsFile();
/* Open/create the global GC lock file. */