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feat: add fuser

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Hatter Jiang
2022-06-11 17:32:21 +08:00
parent fc23a5959b
commit 9ceaf9a789
3 changed files with 509 additions and 0 deletions
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350
__fs/fuser/Cargo.lock generated Normal file
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12
__fs/fuser/Cargo.toml Normal file
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[package]
name = "fuser"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
env_logger = "0.9.0"
libc = "0.2.126"
clap = { version = "3.0", features = ["cargo"] }
fuser = "0.11.0"

147
__fs/fuser/src/main.rs Normal file
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use clap::{crate_version, Arg, Command};
use fuser::{
FileAttr, FileType, Filesystem, MountOption, ReplyAttr, ReplyData, ReplyDirectory, ReplyEntry,
Request,
};
use libc::ENOENT;
use std::ffi::OsStr;
use std::time::{Duration, UNIX_EPOCH};
const TTL: Duration = Duration::from_secs(1); // 1 second
const HELLO_DIR_ATTR: FileAttr = FileAttr {
ino: 1,
size: 0,
blocks: 0,
atime: UNIX_EPOCH, // 1970-01-01 00:00:00
mtime: UNIX_EPOCH,
ctime: UNIX_EPOCH,
crtime: UNIX_EPOCH,
kind: FileType::Directory,
perm: 0o755,
nlink: 2,
uid: 501,
gid: 20,
rdev: 0,
flags: 0,
blksize: 512,
};
const HELLO_TXT_CONTENT: &str = "Hello World!\n";
const HELLO_TXT_ATTR: FileAttr = FileAttr {
ino: 2,
size: 13,
blocks: 1,
atime: UNIX_EPOCH, // 1970-01-01 00:00:00
mtime: UNIX_EPOCH,
ctime: UNIX_EPOCH,
crtime: UNIX_EPOCH,
kind: FileType::RegularFile,
perm: 0o644,
nlink: 1,
uid: 501,
gid: 20,
rdev: 0,
flags: 0,
blksize: 512,
};
struct HelloFS;
impl Filesystem for HelloFS {
fn lookup(&mut self, _req: &Request, parent: u64, name: &OsStr, reply: ReplyEntry) {
if parent == 1 && name.to_str() == Some("hello.txt") {
reply.entry(&TTL, &HELLO_TXT_ATTR, 0);
} else {
reply.error(ENOENT);
}
}
fn getattr(&mut self, _req: &Request, ino: u64, reply: ReplyAttr) {
match ino {
1 => reply.attr(&TTL, &HELLO_DIR_ATTR),
2 => reply.attr(&TTL, &HELLO_TXT_ATTR),
_ => reply.error(ENOENT),
}
}
fn read(
&mut self,
_req: &Request,
ino: u64,
_fh: u64,
offset: i64,
_size: u32,
_flags: i32,
_lock: Option<u64>,
reply: ReplyData,
) {
if ino == 2 {
reply.data(&HELLO_TXT_CONTENT.as_bytes()[offset as usize..]);
} else {
reply.error(ENOENT);
}
}
fn readdir(
&mut self,
_req: &Request,
ino: u64,
_fh: u64,
offset: i64,
mut reply: ReplyDirectory,
) {
if ino != 1 {
reply.error(ENOENT);
return;
}
let entries = vec![
(1, FileType::Directory, "."),
(1, FileType::Directory, ".."),
(2, FileType::RegularFile, "hello.txt"),
];
for (i, entry) in entries.into_iter().enumerate().skip(offset as usize) {
// i + 1 means the index of the next entry
if reply.add(entry.0, (i + 1) as i64, entry.1, entry.2) {
break;
}
}
reply.ok();
}
}
fn main() {
let matches = Command::new("hello")
.version(crate_version!())
.author("Christopher Berner")
.arg(
Arg::new("MOUNT_POINT")
.required(true)
.index(1)
.help("Act as a client, and mount FUSE at given path"),
)
.arg(
Arg::new("auto_unmount")
.long("auto_unmount")
.help("Automatically unmount on process exit"),
)
.arg(
Arg::new("allow-root")
.long("allow-root")
.help("Allow root user to access filesystem"),
)
.get_matches();
env_logger::init();
let mountpoint = matches.value_of("MOUNT_POINT").unwrap();
let mut options = vec![MountOption::RO, MountOption::FSName("hello".to_string())];
if matches.is_present("auto_unmount") {
options.push(MountOption::AutoUnmount);
}
if matches.is_present("allow-root") {
options.push(MountOption::AllowRoot);
}
fuser::mount2(HelloFS, mountpoint, &options).unwrap();
}