mirror of
https://github.com/NixOS/nix
synced 2025-06-24 22:11:15 +02:00
d60a8ee8b0
Add helpful context when opening the Nix database lock fails due to permission errors. Instead of just showing "Permission denied", now provides guidance about possible causes: - Running as non-root in a single-user Nix installation - Nix daemon may have crashed
50 lines
1.9 KiB
Bash
Executable file
50 lines
1.9 KiB
Bash
Executable file
#!/usr/bin/env bash
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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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TODO_NixOS
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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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# `local://` also works.
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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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# Should show enhanced error message with helpful context
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expectStderr 1 nix-store --add eval.nix | grepQuiet "This command may have been run as non-root in a single-user Nix installation"
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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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