*: migrate from lazy_static! to std::sync::LazyLock

This was only stabilised in Rust 1.80.0, so this might cause issues when
building on older distributions (depending on when libpathrs starts
getting packaged).

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

Cargo.toml

@@ -50,8 +50,6 @@ bitflags = "^2"
 itertools = "^0.13"
 libc = "^0.2"
 memchr = "^2"
-# MSRV(1.80): Use LazyLock.
-once_cell = "^1"
 # MSRV(1.65): Update to >=0.4.1 which uses let_else. 0.4.0 was broken.
 open-enum = { version = "=0.3.0", optional = true }
 rand = { version = "^0.8", optional = true }

src/capi/error.rs

@@ -27,16 +27,15 @@ use std::{
     error::Error as StdError,
     ffi::CString,
     ptr,
-    sync::Mutex,
+    sync::{LazyLock, Mutex},
 };
 
 use libc::{c_char, c_int};
-use once_cell::sync::Lazy;
 use rand::{self, Rng};
 
 // TODO: Switch this to using a slab or similar structure, possibly using a less heavy-weight lock?
-// MSRV(1.80): Use LazyLock.
-static ERROR_MAP: Lazy<Mutex<HashMap<CReturn, Error>>> = Lazy::new(|| Mutex::new(HashMap::new()));
+static ERROR_MAP: LazyLock<Mutex<HashMap<CReturn, Error>>> =
+    LazyLock::new(|| Mutex::new(HashMap::new()));
 
 pub(crate) fn store_error(err: Error) -> CReturn {
     let mut err_map = ERROR_MAP.lock().unwrap();

src/procfs.rs

@@ -34,15 +34,14 @@ use std::{
     io::Error as IOError,
     os::unix::io::{AsFd, BorrowedFd, OwnedFd},
     path::{Path, PathBuf},
+    sync::LazyLock,
 };
 
-use once_cell::sync::Lazy;
 use rustix::fs::{self as rustix_fs, Access, AtFlags};
 
 /// A `procfs` handle to which is used globally by libpathrs.
-// MSRV(1.80): Use LazyLock.
-pub(crate) static GLOBAL_PROCFS_HANDLE: Lazy<ProcfsHandle> =
-    Lazy::new(|| ProcfsHandle::new().expect("should be able to get some /proc handle"));
+pub(crate) static GLOBAL_PROCFS_HANDLE: LazyLock<ProcfsHandle> =
+    LazyLock::new(|| ProcfsHandle::new().expect("should be able to get some /proc handle"));
 
 /// Indicate what base directory should be used when doing `/proc/...`
 /// operations with a [`ProcfsHandle`].

src/resolvers/mod.rs

@@ -31,10 +31,9 @@ use std::{
     os::unix::io::{AsFd, OwnedFd},
     path::{Path, PathBuf},
     rc::Rc,
+    sync::LazyLock,
 };
 
-use once_cell::sync::Lazy;
-
 /// `O_PATH`-based userspace resolver.
 pub(crate) mod opath;
 /// `openat2(2)`-based in-kernel resolver.
@@ -65,8 +64,7 @@ pub(crate) enum ResolverBackend {
     //       hyper-concerned users.
 }
 
-// MSRV(1.80): Use LazyLock.
-static DEFAULT_RESOLVER_TYPE: Lazy<ResolverBackend> = Lazy::new(|| {
+static DEFAULT_RESOLVER_TYPE: LazyLock<ResolverBackend> = LazyLock::new(|| {
     if *syscalls::OPENAT2_IS_SUPPORTED {
         ResolverBackend::KernelOpenat2
     } else {

src/resolvers/opath/impl.rs

@@ -58,10 +58,10 @@ use std::{
     },
     path::{Path, PathBuf},
     rc::Rc,
+    sync::LazyLock,
 };
 
 use itertools::Itertools;
-use once_cell::sync::Lazy;
 
 /// Ensure that the expected path within the root matches the current fd.
 fn check_current<RootFd: AsFd, Fd: AsFd, P: AsRef<Path>>(
@@ -135,8 +135,7 @@ fn check_current<RootFd: AsFd, Fd: AsFd, P: AsRef<Path>>(
 // TODO: In theory this value could change during the lifetime of the
 // program, but there's no nice way of detecting that, and the overhead of
 // checking this for every symlink lookup is more likely to be an issue.
-// MSRV(1.80): Use LazyLock.
-static PROTECTED_SYMLINKS_SYSCTL: Lazy<u32> = Lazy::new(|| {
+static PROTECTED_SYMLINKS_SYSCTL: LazyLock<u32> = LazyLock::new(|| {
     utils::sysctl_read_parse(&GLOBAL_PROCFS_HANDLE, "fs.protected_symlinks")
         .expect("should be able to parse fs.protected_symlinks")
 });

src/syscalls.rs

@@ -35,10 +35,10 @@ use std::{
     },
     path::{Path, PathBuf},
     ptr,
+    sync::LazyLock,
 };
 
 use libc::{c_int, c_uint, dev_t, mode_t, stat, statfs};
-use once_cell::sync::Lazy;
 
 // TODO: Figure out how we can put a backtrace here (it seems we can't use
 //       thiserror's backtrace support without nightly Rust because thiserror
@@ -555,8 +555,7 @@ pub(crate) fn renameat<Fd1: AsFd, P1: AsRef<Path>, Fd2: AsFd, P2: AsRef<Path>>(
     }
 }
 
-// MSRV(1.80): Use LazyLock.
-pub(crate) static RENAME_FLAGS_SUPPORTED: Lazy<bool> = Lazy::new(|| {
+pub(crate) static RENAME_FLAGS_SUPPORTED: LazyLock<bool> = LazyLock::new(|| {
     match renameat2(AT_FDCWD, ".", AT_FDCWD, ".", libc::RENAME_EXCHANGE) {
         Ok(_) => true,
         // We expect EBUSY, but just to be safe we only check for ENOSYS.
@@ -702,9 +701,8 @@ pub(crate) fn statx<Fd: AsFd, P: AsRef<Path>>(
     }
 }
 
-// MSRV(1.80): Use LazyLock.
-pub(crate) static OPENAT2_IS_SUPPORTED: Lazy<bool> =
-    Lazy::new(|| openat2(AT_FDCWD, ".", &Default::default()).is_ok());
+pub(crate) static OPENAT2_IS_SUPPORTED: LazyLock<bool> =
+    LazyLock::new(|| openat2(AT_FDCWD, ".", &Default::default()).is_ok());
 
 bitflags! {
     /// Wrapper for the underlying `libc`'s `RESOLVE_*` flags.