diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc index 9fa68303f..67d5a1dcb 100644 --- a/src/libstore/local-store.cc +++ b/src/libstore/local-store.cc @@ -136,7 +136,12 @@ LocalStore::LocalStore( for (auto & perUserDir : {profilesDir + "/per-user", gcRootsDir + "/per-user"}) { createDirs(perUserDir); if (!readOnly) { - if (chmod(perUserDir.c_str(), 0755) == -1) + auto st = lstat(perUserDir); + + // Skip chmod call if the directory already has the correct permissions (0755). + // This is to avoid failing when the executing user lacks permissions to change the directory's permissions + // even if it would be no-op. + if ((st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO)) != 0755 && chmod(perUserDir.c_str(), 0755) == -1) throw SysError("could not set permissions on '%s' to 755", perUserDir); } }