chore: use towncrier for CHANGELOG (#2149)

CHANGELOG.md

@@ -1,75 +1,7 @@
-# Change Log
-
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
-## [Unreleased] - ReleaseDate
-
-### Fixed
-- Fix `SigSet` incorrect implementation of `Eq`, `PartialEq` and `Hash`
-  ([#1946](https://github.com/nix-rust/nix/pull/1946))
-
-- Fixed the function signature of `recvmmsg`, potentially causing UB
-  ([#2119](https://github.com/nix-rust/nix/issues/2119))
-### Added
-
-- Added `impl From<Signal> for SigSet`.
-  ([#1959](https://github.com/nix-rust/nix/pull/1959))
-
-- Added `impl std::ops::BitOr for SigSet`.
-  ([#1959](https://github.com/nix-rust/nix/pull/1959))
-
-- Added `impl std::ops::BitOr for Signal`.
-  ([#1959](https://github.com/nix-rust/nix/pull/1959))
-
-- Added `impl std::ops::BitOr<Signal> for SigSet`
-  ([#1959](https://github.com/nix-rust/nix/pull/1959))
-
-- Fix `SignalFd::set_mask`.  In 0.27.0 it would actually close the file
-  descriptor.
-  ([#2141](https://github.com/nix-rust/nix/pull/2141))
-
-- Added `Icmp` and `IcmpV6` to `SockProtocol`.
-  (#[2103](https://github.com/nix-rust/nix/pull/2103))
-
-- Added `F_GETPATH` FcntlFlags entry on Apple/NetBSD/DragonflyBSD for `::nix::fcntl`.
-  ([#2142](https://github.com/nix-rust/nix/pull/2142))
-
-- Added `Ipv6HopLimit` to `::nix::sys::socket::ControlMessage` for Linux,
-  MacOS, FreeBSD, DragonflyBSD, Android, iOS and Haiku.
-  ([#2074](https://github.com/nix-rust/nix/pull/2074))
-
-- Added `F_KINFO` FcntlFlags entry on FreeBSD for `::nix::fcntl`.
-  ([#2152](https://github.com/nix-rust/nix/pull/2152))
-
-### Changed
-
-- The MSRV is now 1.69
-  ([#2144](https://github.com/nix-rust/nix/pull/2144))
-
-- The following APIs now take an implementation of `AsFd` rather than a
-  `RawFd`:
-
-  - `unistd::tcgetpgrp`
-  - `unistd::tcsetpgrp`
-  - `unistd::fpathconf`
-  - `unistd::ttyname`
-  - `unistd::getpeereid`
-
-  ([#2137](https://github.com/nix-rust/nix/pull/2137))
-
-- Changed `openat()` and `Dir::openat()`, now take optional `dirfd`s
-  ([#2139](https://github.com/nix-rust/nix/pull/2139))
-
-- `PollFd::new` now takes a `BorrowedFd` argument, with relaxed lifetime
-  requirements relative to the previous version.
-  ([#2134](https://github.com/nix-rust/nix/pull/2134))
-
-- `FdSet::{insert, remove, contains}` now take `BorrowedFd` arguments, and have
-  relaxed lifetime requirements relative to 0.27.1.
-  ([#2136](https://github.com/nix-rust/nix/pull/2136))
-
-- Simplified the function signatures of `recvmmsg` and `sendmmsg`
+# Change Log
 
 ## [0.27.1] - 2023-08-28
 

CONTRIBUTING.md

@@ -61,11 +61,30 @@ pull' model described there.
 Please make pull requests against the `master` branch.
 
 If you change the API by way of adding, removing or changing something or if
-you fix a bug, please add an appropriate note to the [change log][cl]. We
-follow the conventions of [Keep A CHANGELOG][kacl].
+you fix a bug, please add an appropriate note, every note should be a new markdown 
+file under the [changelog directory][cl] stating the change made by your pull request, 
+the filename should be in the following foramt:
 
-[cl]: https://github.com/nix-rust/nix/blob/master/CHANGELOG.md
-[kacl]: https://github.com/olivierlacan/keep-a-changelog/tree/18adb5f5be7a898d046f6a4acb93e39dcf40c4ad
+```
+<PULL_REQUEST_ID>.<TYPE>.md
+```
+
+These are 4 `TYPE`s available:
+
+1. `added`
+2. `changed`
+3. `fixed`
+4. `removed`
+
+Let's say you have added a new API to nix, then a change log like this should
+be added (assume it is PR #0)
+
+```md
+# file: 0.added.md
+Added a new API xxx
+```
+
+[cl]: https://github.com/nix-rust/nix/tree/master/changelog
 [pr-docs]: https://help.github.com/articles/using-pull-requests/
 
 ## Testing

RELEASE_PROCEDURE.md

@@ -13,6 +13,9 @@ The release is prepared as follows:
 
 - Ask for a new libc version if, necessary. It usually is.  Then update the
   dependency in Cargo.toml accordingly.
+- Update the version number in `Cargo.toml`
+- Generate `CHANGELOG.md` for this release by 
+  `towncrier build --version=<VERSION> --yes`
 - Confirm that everything's ready for a release by running
   `cargo release <patch|minor|major>`
 - Create the release with `cargo release -x <patch|minor|major>`

changelog/.keep

@@ -0,0 +1,5 @@
+Do not remove this file. This is used to keep the `changelog` dir around after
+generating new changelog file.
+
+Without this, `towncrier` would remove the changelog files as well as the 
+directory if it is empty.

changelog/1946.fixed.md

@@ -0,0 +1 @@
+Fix `SigSet` incorrect implementation of `Eq`, `PartialEq` and `Hash`

changelog/1959.added.md

@@ -0,0 +1,4 @@
+- Added `impl From<Signal> for SigSet`.
+- Added `impl std::ops::BitOr for SigSet`.
+- Added `impl std::ops::BitOr for Signal`.
+- Added `impl std::ops::BitOr<Signal> for SigSet`

changelog/2074.added.md

@@ -0,0 +1,2 @@
+Added `Ipv6HopLimit` to `::nix::sys::socket::ControlMessage` for Linux,
+MacOS, FreeBSD, DragonflyBSD, Android, iOS and Haiku.

changelog/2103.added.md

@@ -0,0 +1 @@
+Added `Icmp` and `IcmpV6` to `SockProtocol`

changelog/2119.changed.md

@@ -0,0 +1 @@
+Simplified the function signatures of `recvmmsg` and `sendmmsg`

changelog/2119.fixed.md

@@ -0,0 +1 @@
+Fixed the function signature of `recvmmsg`, potentially causing UB

changelog/2134.changed.md

@@ -0,0 +1,2 @@
+`PollFd::new` now takes a `BorrowedFd` argument, with relaxed lifetime
+  requirements relative to the previous version.

changelog/2136.changed.md

@@ -0,0 +1,2 @@
+`FdSet::{insert, remove, contains}` now take `BorrowedFd` arguments, and have
+relaxed lifetime requirements relative to 0.27.1.

changelog/2137.changed.md

@@ -0,0 +1,8 @@
+The following APIs now take an implementation of `AsFd` rather than a
+  `RawFd`:
+
+  - `unistd::tcgetpgrp`
+  - `unistd::tcsetpgrp`
+  - `unistd::fpathconf`
+  - `unistd::ttyname`
+  - `unistd::getpeereid`

changelog/2139.changed.md

@@ -0,0 +1 @@
+Changed `openat()` and `Dir::openat()`, now take optional `dirfd`s

changelog/2141.fixed.md

@@ -0,0 +1 @@
+Fix `SignalFd::set_mask`.  In 0.27.0 it would actually close the file descriptor.

changelog/2142.added.md

@@ -0,0 +1 @@
+Added `F_GETPATH` FcntlFlags entry on Apple/NetBSD/DragonflyBSD for `::nix::fcntl`.

changelog/2144.changed.md

@@ -0,0 +1 @@
+The MSRV is now 1.69

changelog/2152.added.md

@@ -0,0 +1 @@
+Added `F_KINFO` FcntlFlags entry on FreeBSD for `::nix::fcntl`.

towncrier.toml

@@ -0,0 +1,27 @@
+# towncrier configuration document: 
+# https://towncrier.readthedocs.io/en/stable/configuration.html
+
+[tool.towncrier]
+# Read news fragments from this directory
+directory = "changelog"
+# Concatenate fragments, and prepend to this file
+filename = "CHANGELOG.md"
+title_format = "## [{version}] - {project_date}"
+# Used to disable towncrier's "=====" title header
+underlines = ["", "", ""]
+# Wrap news fragments to a line length of 79
+wrap = true
+# Every news fragement under the `changelog` directory is named "<id>.<type>.md",
+# this `id` field, is called issue/ticket number in towncrier's term
+# `issue_format` controls how this will be rendered in the final CHANGELOG
+# We use this for Pull Request even though it is called "issue"
+issue_format = "[#{issue}](https://github.com/nix-rust/nix/pull/{issue})"
+# Ask towncrier to add new notes after this
+start_string = "# Change Log\n"
+
+# nix's change log typs (in alphabetical order)
+# These types will be capitalized by default.
+[tool.towncrier.fragment.added]
+[tool.towncrier.fragment.changed]
+[tool.towncrier.fragment.fixed]
+[tool.towncrier.fragment.removed]