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use std::fs::File;
use std::os::unix::fs::symlink;
use std::os::unix::prelude::AsRawFd;
use libc::consts::os::posix88;
use nix::sys::stat::{stat, fstat, lstat};
use nix::sys::stat::FileStat;
use nix::Result;
use tempdir::TempDir;
#[allow(unused_comparisons)]
// uid and gid are signed on Windows, but not on other platforms. This function
// allows warning free compiles on all platforms, and can be removed when
// expression-level #[allow] is available.
fn valid_uid_gid(stat: FileStat) -> bool {
// uid could be 0 for the `root` user. This quite possible when
// the tests are being run on a rooted Android device.
stat.st_uid >= 0 && stat.st_gid >= 0
}
fn assert_stat_results(stat_result: Result<FileStat>) {
match stat_result {
Ok(stats) => {
assert!(stats.st_dev > 0); // must be positive integer, exact number machine dependent
assert!(stats.st_ino > 0); // inode is positive integer, exact number machine dependent
assert!(stats.st_mode > 0); // must be positive integer
assert!(stats.st_nlink == 1); // there links created, must be 1
assert!(valid_uid_gid(stats)); // must be positive integers
assert!(stats.st_size == 0); // size is 0 because we did not write anything to the file
assert!(stats.st_blksize > 0); // must be positive integer, exact number machine dependent
assert!(stats.st_blocks <= 16); // Up to 16 blocks can be allocated for a blank file
}
Err(_) => panic!("stat call failed") // if stats system call fails, something is seriously wrong on that machine
}
}
fn assert_lstat_results(stat_result: Result<FileStat>) {
match stat_result {
Ok(stats) => {
assert!(stats.st_dev > 0); // must be positive integer, exact number machine dependent
assert!(stats.st_ino > 0); // inode is positive integer, exact number machine dependent
assert!(stats.st_mode > 0); // must be positive integer
// st_mode is c_uint (u32 on Android) while S_IFMT is mode_t
// (u16 on Android), and that will be a compile error.
// On other platforms they are the same (either both are u16 or u32).
assert!((stats.st_mode as usize) & (posix88::S_IFMT as usize)
== posix88::S_IFLNK as usize); // should be a link
assert!(stats.st_nlink == 1); // there links created, must be 1
assert!(valid_uid_gid(stats)); // must be positive integers
assert!(stats.st_size > 0); // size is > 0 because it points to another file
assert!(stats.st_blksize > 0); // must be positive integer, exact number machine dependent
// st_blocks depends on whether the machine's file system uses fast
// or slow symlinks, so just make sure it's not negative
// (Android's st_blocks is ulonglong which is always non-negative.)
assert!(stats.st_blocks >= 0);
}
Err(_) => panic!("stat call failed") // if stats system call fails, something is seriously wrong on that machine
}
}
#[test]
fn test_stat_and_fstat() {
let tempdir = TempDir::new("nix-test_stat_and_fstat").unwrap();
let filename = tempdir.path().join("foo.txt");
let file = File::create(&filename).unwrap();
let stat_result = stat(&filename);
assert_stat_results(stat_result);
let fstat_result = fstat(file.as_raw_fd());
assert_stat_results(fstat_result);
}
#[test]
fn test_stat_fstat_lstat() {
let tempdir = TempDir::new("nix-test_stat_fstat_lstat").unwrap();
let filename = tempdir.path().join("bar.txt");
let linkname = tempdir.path().join("barlink");
File::create(&filename).unwrap();
symlink("bar.txt", &linkname).unwrap();
let link = File::open(&linkname).unwrap();
// should be the same result as calling stat,
// since it's a regular file
let stat_result = lstat(&filename);
assert_stat_results(stat_result);
let lstat_result = lstat(&linkname);
assert_lstat_results(lstat_result);
let fstat_result = fstat(link.as_raw_fd());
assert_stat_results(fstat_result);
}
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