hash: remove deprecated funcion and add updated one

Using Errno::last_raw() instead nix::errno::errno

Cargo.toml

@@ -63,7 +63,7 @@ hex = "^0.4"
 ignition-config = ">= 0.3, < 0.6"
 lazy_static = "^1.4"
 libc = "^0.2"
-nix = { version = ">= 0.24, < 0.30", "default_features" = false, "features" = [ "dir", "ioctl", "mount", "process", "sched", "signal", "user"] }
+nix = { version = ">= 0.29, < 0.30", "default_features" = false, "features" = [ "dir", "ioctl", "mount", "process", "sched", "signal", "user"] }
 nmstate = { version = ">= 2.2.3, < 3", default-features = false, features = ["gen_conf"] }
 openssl = "^0.10"
 pipe = ">= 0.3, < 0.5"

src/io/hash.rs

@@ -158,7 +158,7 @@ impl Sha256Digest {
         if unsafe { libc::posix_fadvise(f.as_raw_fd(), 0, 0, libc::POSIX_FADV_SEQUENTIAL) } < 0 {
             eprintln!(
                 "posix_fadvise(SEQUENTIAL) failed (errno {}) -- ignoring...",
-                nix::errno::errno()
+                nix::errno::Errno::last_raw()
             );
         }