Merge #1792

1792: Raise the MSRV to 1.56.1 r=rtzoeller a=asomers

Nix's code hasn't changed.  However, Serde accidentally raised its MSRV
to 1.51.0 in a patch release, due to a Cargo bug.  They don't plan to
change it back.  Nix does not depend on Serde, but it's used by
cargo-hack, which we build as part of our CI process.  So we need to
either raise our MSRV, or else install a separate toolchain during CI
just to build cargo-hack.

serde-rs/serde#2255

Co-authored-by: Alan Somers <asomers@gmail.com>

.cirrus.yml

@@ -9,7 +9,7 @@ env:
   RUSTDOCFLAGS: -D warnings
   TOOL: cargo
   # The MSRV
-  TOOLCHAIN: 1.46.0
+  TOOLCHAIN: 1.56.1
   ZFLAGS:
 
 # Tests that don't require executing the build binaries
@@ -94,9 +94,6 @@ task:
     PATH: $HOME/.cargo/bin:$PATH
     RUSTFLAGS: --cfg qemu -D warnings
     TOOL: cross
-    # Cross needs at least 1.51.0 after Serde accidentally raised its MSRV.
-    # And Clippy has too many false positives from 1.51.0 through 1.53.0
-    TOOLCHAIN: 1.54.0
   matrix:
     - name: Linux arm gnueabi
       env:
@@ -146,18 +143,18 @@ task:
   matrix:
     - name: Linux aarch64
       arm_container:
-        image: rust:1.46
+        image: rust:1.56
       env:
         RUSTFLAGS: --cfg graviton -D warnings
         TARGET: aarch64-unknown-linux-gnu
     - name: Linux x86_64
       container:
-        image: rust:1.46
+        image: rust:1.56
       env:
         TARGET: x86_64-unknown-linux-gnu
     - name: Linux x86_64 musl
       container:
-        image: rust:1.46
+        image: rust:1.56
       env:
         TARGET: x86_64-unknown-linux-musl
   setup_script:
@@ -183,7 +180,7 @@ task:
 # Tasks for cross-compiling, but no testing
 task:
   container:
-    image: rust:1.46
+    image: rust:1.56
   env:
     BUILD: check
     HOST: x86_64-unknown-linux-gnu
@@ -214,27 +211,18 @@ task:
     - name: Illumos
       env:
         TARGET: x86_64-unknown-illumos
-        # illumos toolchain isn't available via rustup until 1.50
-        TOOLCHAIN: 1.50.0
-      container:
-        image: rust:1.50
     # Cross claims to support running tests on iOS, but it actually doesn't.
     # https://github.com/rust-embedded/cross/issues/535
     - name: iOS aarch64
       env:
         # cargo hack tries to invoke the iphonesimulator SDK for iOS
         NOHACK: 1
         TARGET: aarch64-apple-ios
-        # Rustup only supports cross-building from arbitrary hosts for iOS at
-        # 1.49.0 and above.  Below that it's possible to cross-build from a macOS
-        # host, but macOS VMs are more expensive than Linux VMs.
-        TOOLCHAIN: 1.49.0
     - name: iOS x86_64
       env:
         # cargo hack tries to invoke the iphonesimulator SDK for iOS
         NOHACK: 1
         TARGET: x86_64-apple-ios
-        TOOLCHAIN: 1.49.0
     # Cross testing on powerpc fails with "undefined reference to renameat2".
     # Perhaps cross is using too-old a version?
     - name: Linux powerpc
@@ -254,10 +242,6 @@ task:
     - name: macOS aarch64
       env:
         TARGET: aarch64-apple-darwin
-        # macOS aarch64 toolchain isn't available via rustup until 1.49
-        TOOLCHAIN: 1.49.0
-      container:
-        image: rust:1.49
     - name: NetBSD x86_64
       env:
         TARGET: x86_64-unknown-netbsd
@@ -271,7 +255,7 @@ task:
 
 task:
   container:
-    image: rust:1.46
+    image: rust:1.56
   env:
     BUILD: check
   name: Redox x86_64

CHANGELOG.md

@@ -8,6 +8,9 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Changed
 
+- The MSRV is now 1.56.1
+  ([#1792](https://github.com/nix-rust/nix/pull/1792))
+
 ### Fixed
 
 ### Removed

Cargo.toml

@@ -3,7 +3,7 @@ name        = "nix"
 description = "Rust friendly bindings to *nix APIs"
 edition     = "2018"
 version     = "0.25.0"
-rust-version = "1.46"
+rust-version = "1.56"
 authors     = ["The nix-rust Project Developers"]
 repository  = "https://github.com/nix-rust/nix"
 license     = "MIT"

README.md

@@ -89,7 +89,7 @@ Tier 3:
 
 ## Minimum Supported Rust Version (MSRV)
 
-nix is supported on Rust 1.46.0 and higher.  Its MSRV will not be
+nix is supported on Rust 1.56.1 and higher.  Its MSRV will not be
 changed in the future without bumping the major or minor version.
 
 ## Contributing

src/sys/signal.rs

@@ -911,10 +911,11 @@ pub fn sigprocmask(how: SigmaskHow, set: Option<&SigSet>, oldset: Option<&mut Si
 /// # Arguments
 ///
 /// * `pid` -    Specifies which processes should receive the signal.
-///   - If positive, specifies an individual process
+///   - If positive, specifies an individual process.
 ///   - If zero, the signal will be sent to all processes whose group
 ///     ID is equal to the process group ID of the sender.  This is a
-///     variant of [`killpg`].
+#[cfg_attr(target_os = "fuchsia", doc = "variant of `killpg`.")]
+#[cfg_attr(not(target_os = "fuchsia"), doc = "variant of [`killpg`].")]
 ///   - If `-1` and the process has super-user privileges, the signal
 ///     is sent to all processes exclusing system processes.
 ///   - If less than `-1`, the signal is sent to all processes whose

src/sys/socket/addr.rs

@@ -2244,7 +2244,7 @@ pub mod sys_control {
     ///
     /// # References
     ///
-    /// https://developer.apple.com/documentation/kernel/sockaddr_ctl
+    /// <https://developer.apple.com/documentation/kernel/sockaddr_ctl>
     #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
     #[repr(transparent)]
     pub struct SysControlAddr(pub(in super::super) libc::sockaddr_ctl);

test/sys/test_timerfd.rs

@@ -65,5 +65,5 @@ pub fn test_timerfd_unset() {
 
     timer.unset().unwrap();
 
-    assert!(timer.get().unwrap() == None);
+    assert!(timer.get().unwrap().is_none());
 }