infra
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init-wrapper
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코드정리, kmsg 기반으로 로그 전송하도록 처리, allocator 메모리 재활용하도록 처리, init 찾을 수 있도록 처리

This commit is contained in:
Sangbum Kim 2024-03-10 01:53:57 +09:00
parent a249d59b63
commit af8bbab8bf
8 changed files with 457 additions and 195 deletions
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3
Dockerfile
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@ -10,7 +10,7 @@ LABEL org.opencontainers.image.authors="Sangbum Kim <sangbumkim@amuz.es>"
WORKDIR /app
COPY . /app
ENV RUSTFLAGS='-C link-arg=-s -C link-arg=-fuse-ld=lld'
ENV RUSTFLAGS='-C panic=abort -C link-arg=-s -C link-arg=-fuse-ld=lld'
RUN set -x && \
apk add --no-cache \
@ -22,6 +22,7 @@ RUN set -x && \
RUN set -x && \
cargo build --release && \
ls -alh target/release/init-wrapper
# ldd target/release/init-wrapper && \
# && \
# ldd target/release/init-wrapper

1
README.md
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@ -16,6 +16,7 @@ mount -t overlay -o rw,relatime,lowerdir=/run/overlay/lower,upperdir=/run/overla
mkdir -p /run/overlay/merged/oldroot
pivot_root /run/overlay/merged /run/overlay/merged/oldroot
cd /
mount --move /oldroot/dev /dev || true
mount --move /oldroot/run /run
umount -l /oldroot
rmdir /oldroot

59
src/kmsg.rs Normal file
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@ -0,0 +1,59 @@
#![allow(unused_imports)]
use alloc::format;
use core::ffi::CStr;
use libc::{c_char, c_int, open, FILE, O_APPEND, O_CLOEXEC, O_SYNC, O_WRONLY, STDERR_FILENO};
use libc_print::__LibCWriter;
pub(crate) static mut LOG_FD: c_int = STDERR_FILENO;
pub(crate) static mut LOG_FD_KMSG: bool = false;
#[inline]
pub(crate) fn init_kmsg() {
const DEV_KMSG_PATH: *const c_char =
unsafe { CStr::from_bytes_with_nul_unchecked(b"/dev/kmsg\0").as_ptr() };
const LOG_FLAGS: c_int = O_APPEND | O_WRONLY | O_CLOEXEC | O_SYNC;
let fd = unsafe { open(DEV_KMSG_PATH, LOG_FLAGS) };
match fd {
-1 => (),
fd => unsafe {
crate::kmsg::LOG_FD = fd;
LOG_FD_KMSG = true;
},
}
}
#[macro_export]
macro_rules! kprintln {
() => { $crate::kprintln!("") };
($fmt: tt) => {
{
#[allow(unused_must_use)]
unsafe {
let mut stm = libc_print::__LibCWriter::new($crate::kmsg::LOG_FD);
stm.write_str(concat!("init-wrapper: ",$fmt));
if (!$crate::kmsg::LOG_FD_KMSG) {
stm.write_nl();
}
}
}
};
($fmt: tt, $($arg:tt)*) =>{
{
#[allow(unused_must_use)]
unsafe {
let mut stm = libc_print::__LibCWriter::new($crate::kmsg::LOG_FD);
if ($crate::kmsg::LOG_FD_KMSG) {
let buf=alloc::format!(concat!("init-wrapper: ",$fmt),$($arg)*);
for line in buf.lines(){
stm.write_str(&line);
}
}else{
stm.write_fmt(format_args!(concat!("init-wrapper: ",$fmt),$($arg)*));
stm.write_nl();
}
}
}
};
}

11
src/link.rs
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@ -1,6 +1,6 @@
#![allow(non_camel_case_types, dead_code)]
use libc::FILE;
use libc::{exit, FILE};
#[link(name = "c")]
extern "C" {
@ -9,9 +9,16 @@ extern "C" {
static stderr: *mut FILE;
}
#[no_mangle]
extern "C" fn rust_eh_personality() {}
#[no_mangle]
unsafe extern "C" fn _Unwind_Resume() -> ! {
exit(2)
}
#[panic_handler]
#[inline(never)]
#[cfg(not(test))]
unsafe fn panic_handler(_: &core::panic::PanicInfo) -> ! {
libc::exit(2)
exit(2)
}

250
src/main.rs
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@ -2,167 +2,30 @@
#![no_main]
extern crate alloc;
mod kmsg;
mod link;
mod mem;
mod tm;
mod unix;
use errno::Errno;
use alloc::ffi::CString;
use core::ffi::CStr;
use core::ops::Sub;
use core::ptr::null;
use core::time::Duration;
use errno::{errno, Errno};
use kmsg::init_kmsg;
use libc::{
c_int, c_void, chdir, clock_gettime, execv, mkdir, mode_t, mount, rmdir, syscall, timespec,
umount2, SYS_pivot_root, CLOCK_BOOTTIME, EXIT_FAILURE, EXIT_SUCCESS, MNT_DETACH, MS_BIND,
MS_LAZYTIME, MS_MOVE, MS_NODEV, MS_NOSUID, MS_PRIVATE, MS_RDONLY, MS_REC, MS_RELATIME,
};
use libc_print::std_name::eprintln;
struct Timespec {
ts: timespec,
}
type SystemResult = Result<(), Errno>;
impl Sub<Timespec> for Timespec {
type Output = Duration;
fn sub(self, other: Timespec) -> Duration {
let sec = self.ts.tv_sec - other.ts.tv_sec;
let nsec = self.ts.tv_nsec - other.ts.tv_nsec;
if nsec < 0 {
Duration::from_secs(sec as u64) - Duration::from_nanos(nsec.unsigned_abs())
} else {
Duration::from_secs(sec as u64) + Duration::from_nanos(nsec.unsigned_abs())
}
}
}
impl From<timespec> for Timespec {
fn from(item: timespec) -> Self {
Timespec { ts: item }
}
}
impl Into<timespec> for Timespec {
fn into(self) -> timespec {
self.ts
}
}
fn do_mount(
source: Option<&str>,
target: Option<&str>,
fs: Option<&str>,
flags: u64,
opt: Option<&str>,
) -> SystemResult {
// has ownership
let raw_src = source.map(|v| CString::new(v).ok()).flatten();
let raw_tgt = target.map(|v| CString::new(v).ok()).flatten();
let raw_fs = fs.map(|v| CString::new(v).ok()).flatten();
let raw_fs_opt = opt.map(|v| CString::new(v).ok()).flatten();
unsafe {
if mount(
raw_src.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
raw_tgt.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
raw_fs.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
flags,
raw_fs_opt.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null) as *const c_void,
) == -1
{
Err(errno())
} else {
Ok(())
}
}
}
fn do_umount(path: &str, flags: i32) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if umount2(raw_path.as_ref().as_ptr(), flags) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
fn do_mkdir(path: &str, mode: mode_t) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if mkdir(raw_path.as_ref().as_ptr(), mode) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
fn do_rmdir(path: &str) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if rmdir(raw_path.as_ref().as_ptr()) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
fn do_chdir(path: &str) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if chdir(raw_path.as_ref().as_ptr()) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
fn pivot_root(new_root: &str, put_old: &str) -> SystemResult {
let raw_new_root = CString::new(new_root).unwrap();
let raw_put_old = CString::new(put_old).unwrap();
unsafe {
if syscall(
SYS_pivot_root,
raw_new_root.as_ref().as_ptr(),
raw_put_old.as_ref().as_ptr(),
) == -1
{
Err(errno())
} else {
Ok(())
}
}
}
fn do_gettime() -> Result<Timespec, Errno> {
let mut time = timespec {
tv_sec: 0,
tv_nsec: 0,
c_int, EACCES, EINVAL, ENOENT, ENOEXEC, ENOTDIR, EXIT_FAILURE, EXIT_SUCCESS, MNT_DETACH,
MS_BIND, MS_LAZYTIME, MS_MOVE, MS_NODEV, MS_NOSUID, MS_PRIVATE, MS_RDONLY, MS_REC, MS_RELATIME,
};
unsafe {
if clock_gettime(CLOCK_BOOTTIME, &mut time) == -1 {
Err(errno())
} else {
Ok(time.into())
}
}
}
use unix::{
do_chdir, do_execv, do_gettime, do_mkdir, do_mount, do_pivot_root, do_rmdir, do_umount,
};
fn replace_root() -> Result<(), ()> {
match do_mount(None, Some("/"), None, MS_REC | MS_PRIVATE, None) {
Err(e) => {
eprintln!("remount \"/\" with private option failed: {}", e);
kprintln!("remount \"/\" with private option failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("\"/\" remounted"),
Ok(_) => kprintln!("\"/\" remounted"),
};
match do_mount(
@ -173,10 +36,10 @@ fn replace_root() -> Result<(), ()> {
None,
) {
Err(e) => {
eprintln!("mount \"/run\" failed: {}", e);
kprintln!("mount \"/run\" failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("\"/run\" mounted"),
Ok(_) => kprintln!("\"/run\" mounted"),
};
let ovr_dir_structures = [
@ -186,13 +49,14 @@ fn replace_root() -> Result<(), ()> {
("/run/overlay/work", 0o0755),
("/run/overlay/merged", 0o0755),
];
for (path, mode) in ovr_dir_structures {
match do_mkdir(path, mode) {
Err(e) => {
eprintln!("mkdir \"{}\" failed: {}", path, e);
kprintln!("mkdir \"{}\" failed: {}", path, e);
return Err(());
}
Ok(_) => eprintln!("\"{}\" created", path),
Ok(_) => kprintln!("\"{}\" created", path),
}
}
@ -204,10 +68,10 @@ fn replace_root() -> Result<(), ()> {
None,
) {
Err(e) => {
eprintln!("mount \"/run/overlay/lower\" failed: {}", e);
kprintln!("mount \"/run/overlay/lower\" failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("\"/run/overlay/lower\" mounted"),
Ok(_) => kprintln!("\"/run/overlay/lower\" mounted"),
};
match do_mount(
@ -216,66 +80,70 @@ fn replace_root() -> Result<(), ()> {
Some("overlay"), MS_RELATIME|MS_LAZYTIME,
Some("lowerdir=/run/overlay/lower,upperdir=/run/overlay/upper,workdir=/run/overlay/work,redirect_dir=on,uuid=on,metacopy=on,volatile"),
) {
Err(e) => {eprintln!("mount \"/run/overlay/merged\" failed: {}", e);
Err(e) => {kprintln!("mount \"/run/overlay/merged\" failed: {}", e);
return Err(());
},
Ok(_) => eprintln!("\"/run/overlay/merged\" mounted"),
Ok(_) => kprintln!("\"/run/overlay/merged\" mounted"),
};
match do_mkdir("/run/overlay/merged/oldroot", 0o0700) {
Err(e) => {
eprintln!("mkdir \"/run/overlay/merged/oldroot\" failed: {}", e);
kprintln!("mkdir \"/run/overlay/merged/oldroot\" failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("\"/run/overlay/merged/oldroot\" created"),
Ok(_) => kprintln!("\"/run/overlay/merged/oldroot\" created"),
}
match pivot_root("/run/overlay/merged", "/run/overlay/merged/oldroot") {
match do_pivot_root("/run/overlay/merged", "/run/overlay/merged/oldroot") {
Err(e) => {
eprintln!("pivot_root failed: {}", e);
kprintln!("pivot_root failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("pivot_root done"),
Ok(_) => kprintln!("pivot_root done"),
}
match do_chdir("/") {
Err(e) => {
eprintln!("chdir \"/\" failed: {}", e);
kprintln!("chdir \"/\" failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("chdir \"/\" done"),
Ok(_) => kprintln!("chdir \"/\" done"),
}
match do_mount(
Some("/oldroot/run"),
Some("/run"),
None,
MS_REC | MS_MOVE,
None,
let move_mnt_pairs = [
("/oldroot/run", "/run", true),
("/oldroot/dev", "/dev", false),
];
for (src, dst, required) in move_mnt_pairs {
match (
do_mount(Some(src), Some(dst), None, MS_REC | MS_MOVE, None),
required,
) {
Err(e) => {
eprintln!("moving mountpoint \"/oldroot/run\" failed: {}", e);
(Err(Errno(EINVAL)), true) => (),
(Err(e), _) => {
kprintln!("moving mountpoint \"{}\" failed: {}", src, e);
return Err(());
}
Ok(_) => eprintln!("mountpoint \"/oldroot/run\" moved"),
(Ok(_), _) => kprintln!("mountpoint \"{}\" moved", src),
};
}
match do_umount("/oldroot", MNT_DETACH) {
Err(e) => {
eprintln!("umount mountpoint \"/oldroot\" failed: {}", e);
kprintln!("umount mountpoint \"/oldroot\" failed: {}", e);
return Err(());
}
Ok(_) => eprintln!("mountpoint \"/oldroot/run\" unmounted"),
Ok(_) => kprintln!("mountpoint \"/oldroot/run\" unmounted"),
};
let unused_dirs = ["/oldroot", "/run/overlay/merged"];
for path in unused_dirs {
match do_rmdir(path) {
Err(e) => {
eprintln!("remove \"{}\" failed: {}", path, e);
kprintln!("remove \"{}\" failed: {}", path, e);
return Err(());
}
Ok(_) => eprintln!("\"{}\" removed", path),
Ok(_) => kprintln!("\"{}\" removed", path),
}
}
@ -284,9 +152,10 @@ fn replace_root() -> Result<(), ()> {
#[no_mangle]
unsafe extern "C" fn main(_argc: c_int, argv: *mut *const u8) -> c_int {
init_kmsg();
let start = match do_gettime() {
Err(err) => {
eprintln!("{}", err);
kprintln!("{}", err);
return EXIT_FAILURE;
}
Ok(v) => v,
@ -294,23 +163,34 @@ unsafe extern "C" fn main(_argc: c_int, argv: *mut *const u8) -> c_int {
match replace_root() {
Err(_) => return EXIT_FAILURE,
Ok(_) => eprintln!("rootfs replaced with overlayfs!"),
Ok(_) => kprintln!("rootfs replaced with overlayfs!"),
};
let end = match do_gettime() {
Err(err) => {
eprintln!("{}", err);
kprintln!("{}", err);
return EXIT_FAILURE;
}
Ok(v) => v,
};
let elapsed = end - start;
eprintln!("processed in {:?}", elapsed);
kprintln!("processed in {:?}", elapsed);
// overwrite arg0
let init_path = CStr::from_bytes_with_nul_unchecked(b"/sbin/init\0");
*argv = init_path.as_ptr();
execv(init_path.as_ptr(), argv);
EXIT_SUCCESS
let init_candidates = ["/sbin/init", "/usr/sbin/init", "/usr/lib/systemd/systemd"];
for init_path in init_candidates {
kprintln!("trying to execute \"{}\"", init_path);
match do_execv(init_path, argv) {
Err(Errno(ENOENT)) | Err(Errno(EACCES)) | Err(Errno(ENOEXEC)) | Err(Errno(ENOTDIR)) => {
continue;
}
Err(e) => {
kprintln!("execution \"{}\" failed: {}", init_path, e);
break;
}
Ok(()) => return EXIT_SUCCESS,
};
}
EXIT_FAILURE
}

82
src/mem.rs
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@ -1,18 +1,96 @@
use core::alloc::{GlobalAlloc, Layout};
use libc::{c_void, free, malloc};
use core::{cmp, mem, ptr};
use libc::{c_void, calloc, free, malloc, posix_memalign, realloc};
const MIN_ALIGN: usize = 16;
/// The global allocator type.
#[derive(Default)]
pub struct Allocator;
impl Allocator {}
unsafe impl GlobalAlloc for Allocator {
#[inline]
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
// jemalloc provides alignment less than MIN_ALIGN for small allocations.
// So only rely on MIN_ALIGN if size >= align.
// Also see <https://github.com/rust-lang/rust/issues/45955> and
// <https://github.com/rust-lang/rust/issues/62251#issuecomment-507580914>.
if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
malloc(layout.size()) as *mut u8
} else {
#[cfg(target_os = "macos")]
{
if layout.align() > (1 << 31) {
return ptr::null_mut();
}
}
aligned_malloc(&layout)
}
}
#[inline]
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
// See the comment above in `alloc` for why this check looks the way it does.
if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
calloc(layout.size(), 1) as *mut u8
} else {
let ptr = self.alloc(layout);
if !ptr.is_null() {
ptr::write_bytes(ptr, 0, layout.size());
}
ptr
}
}
#[inline]
unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
free(ptr as *mut c_void);
free(ptr as *mut c_void)
}
#[inline]
unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
realloc(ptr as *mut c_void, new_size) as *mut u8
} else {
realloc_fallback(self, ptr, layout, new_size)
}
}
}
/// The static global allocator.
#[global_allocator]
static GLOBAL_ALLOCATOR: Allocator = Allocator;
#[inline]
unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
let mut out = ptr::null_mut();
// posix_memalign requires that the alignment be a multiple of `sizeof(void*)`.
// Since these are all powers of 2, we can just use max.
let align = layout.align().max(mem::size_of::<usize>());
let ret = posix_memalign(&mut out, align, layout.size());
if ret != 0 {
ptr::null_mut()
} else {
out as *mut u8
}
}
#[inline]
unsafe fn realloc_fallback(
allocator: &Allocator,
ptr: *mut u8,
old_layout: Layout,
new_size: usize,
) -> *mut u8 {
// Docs for GlobalAlloc::realloc require this to be valid:
let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());
let new_ptr = allocator.alloc(new_layout);
if !new_ptr.is_null() {
let size = cmp::min(old_layout.size(), new_size);
ptr::copy_nonoverlapping(ptr, new_ptr, size);
allocator.dealloc(ptr, old_layout);
}
new_ptr
}

42
src/tm.rs Normal file
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@ -0,0 +1,42 @@
use core::ops::Sub;
use core::time::Duration;
use libc::timespec;
pub(crate) struct Timespec {
pub(crate) ts: timespec,
}
pub(crate) fn new_timespec() -> Timespec {
Timespec {
ts: timespec {
tv_sec: 0,
tv_nsec: 0,
},
}
}
impl Sub<Timespec> for Timespec {
type Output = Duration;
fn sub(self, other: Timespec) -> Duration {
let sec = self.ts.tv_sec - other.ts.tv_sec;
let nsec = self.ts.tv_nsec - other.ts.tv_nsec;
if nsec < 0 {
Duration::from_secs(sec as u64) - Duration::from_nanos(nsec.unsigned_abs())
} else {
Duration::from_secs(sec as u64) + Duration::from_nanos(nsec.unsigned_abs())
}
}
}
impl From<timespec> for Timespec {
fn from(item: timespec) -> Self {
Timespec { ts: item }
}
}
impl Into<timespec> for Timespec {
fn into(self) -> timespec {
self.ts
}
}

194
src/unix.rs Normal file
View File

@ -0,0 +1,194 @@
use crate::tm::{new_timespec, Timespec};
use alloc::ffi::CString;
use core::borrow::BorrowMut;
use core::ptr::null;
use errno::{errno, Errno};
use libc::{
c_void, chdir, clock_gettime, execv, mkdir, mode_t, mount, rmdir, syscall, umount2,
SYS_pivot_root, CLOCK_BOOTTIME,
};
#[cfg(test)]
use libc::{
c_uint, makedev, mkdir, mknod, mode_t, mount, readlinkat, rmdir, strlen, syscall, umount2,
unlink, SYS_pivot_root, AT_FDCWD, CLOCK_BOOTTIME, S_IFCHR,
};
pub(crate) type SystemResult = Result<(), Errno>;
#[cfg(test)]
pub(crate) fn do_mknod(path: &str, major: c_uint, minor: c_uint) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
let dev = makedev(major, minor);
if mknod(raw_path.as_ref().as_ptr(), S_IFCHR, dev) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_mount(
source: Option<&str>,
target: Option<&str>,
fs: Option<&str>,
flags: u64,
opt: Option<&str>,
) -> SystemResult {
// has ownership
let raw_src = source.map(|v| CString::new(v).ok()).flatten();
let raw_tgt = target.map(|v| CString::new(v).ok()).flatten();
let raw_fs = fs.map(|v| CString::new(v).ok()).flatten();
let raw_fs_opt = opt.map(|v| CString::new(v).ok()).flatten();
unsafe {
if mount(
raw_src.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
raw_tgt.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
raw_fs.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null),
flags,
raw_fs_opt.as_ref().map(|v| v.as_ptr()).unwrap_or_else(null) as *const c_void,
) == -1
{
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_umount(path: &str, flags: i32) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if umount2(raw_path.as_ref().as_ptr(), flags) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
#[cfg(test)]
pub(crate) fn do_readlink(path: &str) -> Result<CString, Errno> {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
const BUF_SZ: usize = 1024;
let mut buf = [0u8; BUF_SZ];
if readlinkat(
AT_FDCWD,
raw_path.as_ref().as_ptr(),
buf.as_mut_ptr() as *mut _,
buf.len() as size_t,
) == -1
{
return Err(errno());
}
let c_str_len = strlen(buf.as_ptr() as *const _);
Ok(from_utf8_lossy(&buf[..c_str_len]))
}
}
pub(crate) fn do_mkdir(path: &str, mode: mode_t) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if mkdir(raw_path.as_ref().as_ptr(), mode) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
#[cfg(test)]
pub(crate) fn do_unlink(path: &str) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if unlink(raw_path.as_ref().as_ptr()) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_rmdir(path: &str) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if rmdir(raw_path.as_ref().as_ptr()) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_execv(path: &str, argv: *mut *const u8) -> SystemResult {
let raw_init_path = CString::new(path).unwrap();
unsafe {
*argv = raw_init_path.as_ref().as_ptr();
if execv(raw_init_path.as_ref().as_ptr(), argv) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_chdir(path: &str) -> SystemResult {
// has ownership
let raw_path = CString::new(path).unwrap();
unsafe {
if chdir(raw_path.as_ref().as_ptr()) == -1 {
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_pivot_root(new_root: &str, put_old: &str) -> SystemResult {
let raw_new_root = CString::new(new_root).unwrap();
let raw_put_old = CString::new(put_old).unwrap();
unsafe {
if syscall(
SYS_pivot_root,
raw_new_root.as_ref().as_ptr(),
raw_put_old.as_ref().as_ptr(),
) == -1
{
Err(errno())
} else {
Ok(())
}
}
}
pub(crate) fn do_gettime() -> Result<Timespec, Errno> {
let mut time = new_timespec();
unsafe {
if clock_gettime(CLOCK_BOOTTIME, time.ts.borrow_mut()) == -1 {
Err(errno())
} else {
Ok(time.into())
}
}
}
#[cfg(test)]
#[inline]
fn from_utf8_lossy(input: &[u8]) -> &str {
match str::from_utf8(input) {
Ok(valid) => valid,
Err(error) => unsafe { str::from_utf8_unchecked(&input[..error.valid_up_to()]) },
}
}