Upgrade nix to 0.30

Minor code change required due to change in fallocate signature.

Author: nicholasbishop

Cargo.lock

@@ -21,7 +21,7 @@ ext4-view = { path = "../", features = ["std"] }
 gpt_disk_io = { version = "0.16.0", features = ["std"] }
 libc = "0.2.155"
 lzma-rs = "0.3.0"
-nix = { version = "0.29.0", features = ["fs", "user"] }
+nix = { version = "0.30.0", features = ["fs", "user"] }
 ovmf-prebuilt = "0.2.2"
 sha2 = "0.10.8"
 tar = "0.4.40"

xtask/Cargo.toml

@@ -19,7 +19,6 @@ use dmsetup::{DmDevice, DmFlakey};
 use losetup::LoopDevice;
 use nix::fcntl::{self, FallocateFlags};
 use std::fs::{self, OpenOptions};
-use std::os::fd::AsRawFd;
 use std::os::unix::fs::symlink;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -451,7 +450,7 @@ fn create_file_with_holes(path: &Path) -> Result<()> {
         let offset = block_size * block;
         let len = block_size * 2;
         fcntl::fallocate(
-            f.as_raw_fd(),
+            &f,
             FallocateFlags::FALLOC_FL_PUNCH_HOLE
                 | FallocateFlags::FALLOC_FL_KEEP_SIZE,
             offset as i64,