tmpdir is a helper class representing a temporary directory.
Unfortunately, it suffers for some problems such as lack of proper
encapsulation and weak typing. This has caused bugs in the past when the
user code accidentally modified the member variable with the path to the
directory.
This patch modernises tmpdir and updates its users. The path is stored
in a std::filesystem::path and available read-only to the class users.
mkdtemp and boost are replaced by standard solution.
The users are update to use path more (when it didn't involve too many
changes to their code) and stop using lw_shared_ptr to store the tmpdir
when it wasn't necessary.
tmpdir intentionally doesn't provide any helpers for getting the path as
a string in order to discourage weak types.
Message-Id: <20190207145727.491-1-pdziepak@scylladb.com>
Reduces view_schema_test runtime to 5 seconds, from 53 seconds on an NVMe disk
with write-back cache, and forever on a spinning disk.
Message-Id: <20170716081653.10018-1-avi@scylladb.com>
