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Improve database lock permission error context

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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
This commit is contained in:
Matthew Kenigsberg 2025-06-09 16:46:20 -06:00 • committed by Jörg Thalheim
parent c5b1be46b4
commit d60a8ee8b0
2 changed files with 12 additions and 2 deletions
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11
src/libstore/local-store.cc
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@ -221,7 +221,16 @@ LocalStore::LocalStore(ref<const Config> config)
schema upgrade is in progress. */
if (!config->readOnly) {
Path globalLockPath = dbDir + "/big-lock";
globalLock = openLockFile(globalLockPath.c_str(), true);
try {
globalLock = openLockFile(globalLockPath.c_str(), true);
} catch (SysError & e) {
if (e.errNo == EACCES || e.errNo == EPERM) {
e.addTrace({},
"This command may have been run as non-root in a single-user Nix installation,\n"
"or the Nix daemon may have crashed.");
}
throw;
}
}
if (!config->readOnly && !lockFile(globalLock.get(), ltRead, false)) {