From: shyouhei@... Date: 2017-09-25T12:37:29+00:00 Subject: [ruby-core:82993] [Ruby trunk Feature#13696] Add exchange and noreplace options to File.rename Issue #13696 has been updated by shyouhei (Shyouhei Urabe). I think it's hard to have platform-specific API extensions like this to be in-core. If atomicity is such an important feature (and I'm sure it is), it's hard to emulate this in pure-userland for people without OS that support it. This should be implemented as a gem. That way, gem install can bail out purposefully for unsupported platforms. That should prevent hidden race condition that you want to avoid. ---------------------------------------- Feature #13696: Add exchange and noreplace options to File.rename https://bugs.ruby-lang.org/issues/13696#change-66901 * Author: Glass_saga (Masaki Matsushita) * Status: Open * Priority: Normal * Assignee: Glass_saga (Masaki Matsushita) * Target version: 2.5 ---------------------------------------- renameat2(2) introduced in linux kernel 3.15 takes following flags. ``` RENAME_EXCHANGE: Atomically exchange oldpath and newpath. RENAME_NOREPLACE: Don't overwrite newpath of the rename. Return an error if newpath already exists. ``` This change makes `File.rename` take these flags as keyword arguments. Example: ```ruby File.write("hoge", "hoge") File.write("fuga", "fuga") File.rename("hoge", "fuga", exchange: true) # atomically exchanged File.read("fuga") #=> "hoge" File.rename("hoge", "fuga", noreplace: true) #=> File exists @ syserr_fail2_in - fuga (Errno::EEXIST) ``` ---Files-------------------------------- patch.diff (4.19 KB) patch.diff (4.84 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: