build: avoid unsupported rlimit crate on fuchsia

Cargo.toml

@@ -390,9 +390,11 @@ runcon = { optional = true, version = "0.13.0", package = "uu_runcon", path = "s
 # Not needed for now. Keep as examples:
 #pin_cc = { version="1.0.61, < 1.0.62", package="cc" } ## cc v1.0.62 has compiler errors for MinRustV v1.32.0, requires 1.34 (for `std::str::split_ascii_whitespace()`)
 
+[target.'cfg(all(unix, not(target_os = "fuchsia")))'.dev-dependencies]
+rlimit = { workspace = true }
+
 [target.'cfg(unix)'.dev-dependencies]
 nix = { workspace = true, features = ["fs", "signal"] }
-rlimit = { workspace = true }
 rustix = { workspace = true, features = ["net", "process"] }
 
 [build-dependencies]

src/uu/sort/Cargo.toml

@@ -39,13 +39,15 @@ uucore = { workspace = true, features = [
 [target.'cfg(all(unix, not(any(target_os = "redox", target_os = "fuchsia", target_os = "haiku", target_os = "solaris", target_os = "illumos"))))'.dependencies]
 rustix = { workspace = true, features = ["fs", "system", "process"] }
 
+[target.'cfg(all(unix, not(target_os = "fuchsia")))'.dependencies]
+rlimit = { workspace = true }
+
 [target.'cfg(not(any(target_os = "redox", target_os = "wasi")))'.dependencies]
 ctrlc = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]
 libc = { workspace = true }
 rustix = { workspace = true, features = ["fs"] }
-rlimit = { workspace = true }
 
 [dev-dependencies]
 divan = { workspace = true }

src/uu/sort/src/sort.rs

@@ -1529,7 +1529,7 @@ fn make_sort_mode_arg(mode: &'static str, short: char, help: String) -> Arg {
         .action(ArgAction::SetTrue)
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "fuchsia")))]
 fn get_rlimit() -> UResult<usize> {
     use rlimit::{Resource, getrlimit};
 
@@ -1540,12 +1540,12 @@ fn get_rlimit() -> UResult<usize> {
         .map_err(|_| UUsageError::new(2, translate!("sort-failed-fetch-rlimit")))
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "fuchsia")))]
 pub(crate) fn fd_soft_limit() -> Option<usize> {
     get_rlimit().ok()
 }
 
-#[cfg(not(unix))]
+#[cfg(not(all(unix, not(target_os = "fuchsia"))))]
 pub(crate) fn fd_soft_limit() -> Option<usize> {
     None
 }

tests/uutests/Cargo.toml

@@ -33,11 +33,13 @@ uucore = { workspace = true, features = [
   "utmpx",
 ] }
 
+[target.'cfg(all(unix, not(target_os = "fuchsia")))'.dependencies]
+rlimit = { workspace = true }
+
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
 
 [target.'cfg(unix)'.dependencies]
 nix = { workspace = true, features = ["fs", "term"] }
-rlimit = { workspace = true }
 rustix = { workspace = true, features = ["pty", "termios"] }
 
 [target.'cfg(any(target_os = "freebsd", target_os = "hurd", target_os = "linux", target_os = "android", target_os = "netbsd"))'.dependencies]

tests/uutests/src/lib/util.rs

@@ -24,7 +24,7 @@ use nix::sys;
 #[cfg(not(windows))]
 use nix::sys::stat::{self, SFlag};
 use pretty_assertions::assert_eq;
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "fuchsia")))]
 use rlimit::{Resource, setrlimit};
 use std::borrow::Cow;
 use std::collections::{BTreeMap, VecDeque};
@@ -1562,7 +1562,7 @@ pub struct UCommand {
     stdout: Option<Stdio>,
     stderr: Option<Stdio>,
     bytes_into_stdin: Option<Vec<u8>>,
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "fuchsia")))]
     limits: Vec<(Resource, u64, u64)>,
     #[cfg(unix)]
     ignore_sigxfsz: bool,
@@ -1727,7 +1727,7 @@ impl UCommand {
         self
     }
 
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "fuchsia")))]
     pub fn limit(&mut self, resource: Resource, soft_limit: u64, hard_limit: u64) -> &mut Self {
         self.limits.push((resource, soft_limit, hard_limit));
         self
@@ -2086,7 +2086,7 @@ impl UCommand {
             }
         }
 
-        #[cfg(unix)]
+        #[cfg(all(unix, not(target_os = "fuchsia")))]
         if !self.limits.is_empty() {
             // just to be safe: move a copy of the limits list into the closure.
             // this way the closure is fully self-contained.
@@ -3768,7 +3768,7 @@ mod tests {
             .stdout_is("unlimited\nunlimited\n");
     }
 
-    #[cfg(unix)]
+    #[cfg(all(unix, not(target_os = "fuchsia")))]
     #[test]
     fn test_application_of_process_resource_limits_limited_file_size() {
         let unit_size_bytes = if cfg!(target_vendor = "apple") {