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Travis Burtrum 2022-08-03 22:23:09 -04:00
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**/*.kate-swp
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todo.txt
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of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions; the
above requirements apply either way.
#### 8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your license
from a particular copyright holder is reinstated (a) provisionally,
unless and until the copyright holder explicitly and finally
terminates your license, and (b) permanently, if the copyright holder
fails to notify you of the violation by some reasonable means prior to
60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
#### 9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or run
a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
#### 10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
#### 11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims owned
or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within the
scope of its coverage, prohibits the exercise of, or is conditioned on
the non-exercise of one or more of the rights that are specifically
granted under this License. You may not convey a covered work if you
are a party to an arrangement with a third party that is in the
business of distributing software, under which you make payment to the
third party based on the extent of your activity of conveying the
work, and under which the third party grants, to any of the parties
who would receive the covered work from you, a discriminatory patent
license (a) in connection with copies of the covered work conveyed by
you (or copies made from those copies), or (b) primarily for and in
connection with specific products or compilations that contain the
covered work, unless you entered into that arrangement, or that patent
license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
#### 12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under
this License and any other pertinent obligations, then as a
consequence you may not convey it at all. For example, if you agree to
terms that obligate you to collect a royalty for further conveying
from those to whom you convey the Program, the only way you could
satisfy both those terms and this License would be to refrain entirely
from conveying the Program.
#### 13. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your
version supports such interaction) an opportunity to receive the
Corresponding Source of your version by providing access to the
Corresponding Source from a network server at no charge, through some
standard or customary means of facilitating copying of software. This
Corresponding Source shall include the Corresponding Source for any
work covered by version 3 of the GNU General Public License that is
incorporated pursuant to the following paragraph.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the work with which it is combined will remain governed by version
3 of the GNU General Public License.
#### 14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Affero General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies that a certain numbered version of the GNU Affero General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU Affero General Public License, you may choose any version ever
published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future versions
of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
#### 15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
#### 16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
#### 17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
### How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for
the specific requirements.
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU AGPL, see <https://www.gnu.org/licenses/>.

649
src/main.rs Normal file
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@ -0,0 +1,649 @@
use fuse::{
FileAttr, FileType, Filesystem, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty, ReplyEntry,
ReplyOpen, Request,
};
use libc::{
c_int, EINVAL, EIO, ENOENT, EPERM, O_ACCMODE, O_APPEND, O_CREAT, O_EXCL, O_RDONLY, O_RDWR,
O_TRUNC, O_WRONLY,
};
use log::{debug, error, warn};
use serde::{Deserialize, Serialize};
use std::{
collections::HashMap,
env,
ffi::{OsStr, OsString},
fmt::{Debug, Formatter},
fs::File,
io::{BufReader, BufWriter, Error, ErrorKind},
ops::Deref,
os::unix::{
ffi::OsStrExt,
fs::{MetadataExt, PermissionsExt},
},
path::{Path, PathBuf},
time::{Duration, SystemTime, UNIX_EPOCH},
};
type Result<T> = std::result::Result<T, Error>;
type SerdeResult<T> = std::result::Result<T, Box<dyn std::error::Error>>;
const TTL: Duration = Duration::from_secs(120);
#[derive(Serialize, Deserialize)]
#[serde(remote = "FileType")]
enum FileTypeDef {
NamedPipe,
CharDevice,
BlockDevice,
Directory,
RegularFile,
Symlink,
Socket,
}
#[derive(Serialize, Deserialize)]
#[serde(remote = "FileAttr")]
struct FileAttrDef {
pub ino: u64,
pub size: u64,
pub blocks: u64,
pub atime: SystemTime,
pub mtime: SystemTime,
pub ctime: SystemTime,
pub crtime: SystemTime,
#[serde(with = "FileTypeDef")]
pub kind: FileType,
pub perm: u16,
pub nlink: u32,
pub uid: u32,
pub gid: u32,
pub rdev: u32,
pub flags: u32,
}
#[derive(Serialize, Deserialize)]
enum TypeExtra {
RegularFile,
Symlink(OsString),
Directory(HashMap<OsString, u64>),
}
#[derive(Serialize, Deserialize)]
struct FileInfo {
parent: u64,
path: PathBuf,
#[serde(with = "FileAttrDef")]
attr: FileAttr,
type_extra: TypeExtra,
}
#[derive(Default, Serialize, Deserialize)]
struct FileTree {
inode_to_path: HashMap<u64, FileInfo>,
}
impl Debug for FileTree {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
writeln!(f, "FileTree")?;
// dumb way to always print this in inode order
let mut inode_to_path = std::collections::BTreeMap::default();
inode_to_path.extend(self.inode_to_path.iter());
for (key, val) in inode_to_path.iter() {
writeln!(
f,
"-- {key}: [parent: {}, {:?}, {:?}]",
val.parent, val.attr.kind, val.path
)?;
match &val.type_extra {
TypeExtra::Directory(children) => writeln!(f, "---- children: {:?}", children)?,
TypeExtra::Symlink(link) => writeln!(f, "---- link to: {:?}", link)?,
TypeExtra::RegularFile => (),
}
}
Ok(())
}
}
impl FileTree {
fn load_or_build(root_path: &Path, cache_path: &Path) -> SerdeResult<Self> {
let path = cache_path.join("cache-fs.tree");
match FileTree::load(&path) {
Ok(tree) => return Ok(tree),
Err(e) => warn!("error loading {:?}: {:?}", path, e),
}
let tree = FileTree::build(root_path);
tree.save(&path)?;
Ok(tree)
}
fn load(path: &Path) -> SerdeResult<Self> {
let file = File::open(path)?;
let file = BufReader::new(file);
Ok(bincode::deserialize_from(file)?)
}
fn save(&self, path: &Path) -> SerdeResult<()> {
let file = File::create(path)?;
let file = BufWriter::new(file);
Ok(bincode::serialize_into(file, self)?)
}
fn build(root_path: &Path) -> Self {
let mut tree = FileTree::default();
let mut ino = 1;
let root = FileInfo {
parent: 0, // probably should be None but this is the only file without a parent
path: PathBuf::new(),
attr: std::fs::symlink_metadata(root_path)
.and_then(|m| meta2attr(&m, ino))
.expect("cannot read root dir"),
type_extra: TypeExtra::Directory(Default::default()),
};
tree.inode_to_path.insert(1, root);
ino += 1;
let mut dirs = vec![1];
while !dirs.is_empty() {
let mut all_dirs = Vec::new();
for dir in dirs {
tree.process_dir(root_path, &mut ino, &mut all_dirs, dir);
}
dirs = all_dirs;
}
debug!("build tree: {:?}", tree);
tree
}
fn process_dir(
&mut self,
root_path: &Path,
ino_counter: &mut u64,
dirs: &mut Vec<u64>,
ino: u64,
) {
let dir = self
.inode_to_path
.get_mut(&ino)
.expect("missing dir ino, programming error");
if let Ok(x) = std::fs::read_dir(root_path.join(&dir.path)) {
if let TypeExtra::Directory(children) = &mut dir.type_extra {
children.reserve(x.size_hint().0);
} else {
panic!("impossible")
};
let dir_path = dir.path.clone();
for de in x.flatten() {
if let Ok(attr) = de.metadata().and_then(|m| meta2attr(&m, *ino_counter)) {
let path = dir_path.join(de.file_name());
let type_extra = match attr.kind {
FileType::RegularFile => TypeExtra::RegularFile,
FileType::Directory => {
dirs.push(attr.ino);
TypeExtra::Directory(Default::default())
}
FileType::Symlink => {
let entry_path = root_path.join(&path);
match std::fs::read_link(entry_path) {
Err(e) => {
// I guess on error we just ignore this symlink like it doesn't exist
error!("bad symlink? {:?}", e);
continue;
}
Ok(x) => TypeExtra::Symlink(x.into_os_string()),
}
}
_ => panic!("impossible to happen, we filter other types out"),
};
let child = FileInfo {
parent: ino,
path,
attr,
type_extra,
};
// avoid this lookup each time with something better?
if let Some(TypeExtra::Directory(children)) =
&mut self.inode_to_path.get_mut(&ino).map(|f| &mut f.type_extra)
{
children.insert(de.file_name(), child.attr.ino);
} else {
unreachable!("this should be impossible");
}
self.inode_to_path.insert(child.attr.ino, child);
*ino_counter += 1;
}
}
}
}
pub fn lookup(&self, parent: u64, child: &OsStr) -> Option<&FileAttr> {
let (_, children) = self.folder(parent)?;
let child = children.get(child)?;
let child = self.inode_to_path.get(child)?;
Some(&child.attr)
}
pub fn getattr(&self, ino: u64) -> Option<&FileAttr> {
Some(&self.inode_to_path.get(&ino)?.attr)
}
pub fn folder(&self, ino: u64) -> Option<(&FileInfo, &HashMap<OsString, u64>)> {
self.inode_to_path.get(&ino).and_then(|f| {
if let TypeExtra::Directory(children) = &f.type_extra {
Some((f, children))
} else {
None
}
})
}
pub fn symlink(&self, ino: u64) -> Option<(&FileInfo, &OsString)> {
self.inode_to_path.get(&ino).and_then(|f| {
if let TypeExtra::Symlink(link) = &f.type_extra {
Some((f, link))
} else {
None
}
})
}
pub fn file(&self, ino: u64) -> Option<&FileInfo> {
self.inode_to_path.get(&ino)
}
}
#[derive(Debug)]
struct FileHandle {
file: File,
count: usize,
}
impl FileHandle {
fn new(file: File) -> Self {
FileHandle { file, count: 1 }
}
fn open(&mut self) {
self.count += 1;
}
fn close(&mut self) -> bool {
self.count -= 1;
self.count == 0
}
}
impl Deref for FileHandle {
type Target = File;
fn deref(&self) -> &Self::Target {
&self.file
}
}
struct CacheFs {
remote_dir: PathBuf,
cache_dir: PathBuf,
cache_tmp_file: PathBuf,
tree: FileTree,
opened_files: HashMap<u64, FileHandle>,
read_buffer: Vec<u8>,
}
impl CacheFs {
pub fn new(remote_dir: PathBuf, cache_dir: PathBuf, tree: FileTree) -> CacheFs {
CacheFs {
remote_dir,
cache_dir: cache_dir.join("root"),
cache_tmp_file: cache_dir.join("tmp.file"),
tree,
opened_files: HashMap::with_capacity(2),
read_buffer: Vec::with_capacity(4096),
}
}
}
fn ft2ft(t: std::fs::FileType) -> Result<FileType> {
match t {
x if x.is_symlink() => Ok(FileType::Symlink),
x if x.is_dir() => Ok(FileType::Directory),
x if x.is_file() => Ok(FileType::RegularFile),
_ => Err(Error::from(ErrorKind::NotFound)),
}
}
fn meta2attr(m: &std::fs::Metadata, ino: u64) -> Result<FileAttr> {
Ok(FileAttr {
kind: ft2ft(m.file_type())?,
ino,
size: m.size(),
blocks: m.blocks(),
atime: m.accessed().unwrap_or(UNIX_EPOCH),
mtime: m.modified().unwrap_or(UNIX_EPOCH),
ctime: UNIX_EPOCH + Duration::from_secs(m.ctime().try_into().unwrap_or(0)),
crtime: m.created().unwrap_or(UNIX_EPOCH),
perm: m.permissions().mode() as u16,
nlink: m.nlink() as u32,
uid: m.uid(),
gid: m.gid(),
rdev: m.rdev() as u32,
flags: 0,
})
}
fn errhandle(e: Error) -> libc::c_int {
match e.kind() {
ErrorKind::PermissionDenied => EPERM,
ErrorKind::NotFound => ENOENT,
e => {
error!("{:?}", e);
EIO
}
}
}
impl Filesystem for CacheFs {
fn lookup(&mut self, _req: &Request, parent: u64, name: &OsStr, reply: ReplyEntry) {
debug!("lookup: parent: {parent}, name: {:?}", name);
match self.tree.lookup(parent, name) {
None => reply.error(ENOENT),
Some(attr) => reply.entry(&TTL, attr, 1),
}
}
fn getattr(&mut self, _req: &Request, ino: u64, reply: ReplyAttr) {
debug!("getattr: ino: {ino}");
match self.tree.getattr(ino) {
None => reply.error(ENOENT),
Some(attr) => reply.attr(&TTL, attr),
}
}
fn open(&mut self, _req: &Request, ino: u64, flags: u32, reply: ReplyOpen) {
debug!("open: ino: {ino}, flags: {flags}");
if let Some(file_handle) = self.opened_files.get_mut(&ino) {
file_handle.open();
return reply.opened(ino, 0);
}
let entry_path = match self.tree.file(ino) {
None => return reply.error(ENOENT),
Some(file) => &file.path,
};
debug!("open: entry_path: {:?}", entry_path);
let fl = flags as c_int;
if !matches!(fl & O_ACCMODE, O_RDONLY | O_WRONLY | O_RDWR) {
return reply.error(EINVAL);
}
if (fl & (O_EXCL | O_CREAT) != 0) || fl & O_APPEND == O_APPEND || fl & O_TRUNC == O_TRUNC {
error!("Wrong flags on open");
return reply.error(EIO);
}
let mut oo = std::fs::OpenOptions::new();
oo.read(true);
oo.write(false);
oo.create(false);
oo.append(false);
oo.truncate(false);
let cache_path = self.cache_dir.join(&entry_path);
if !&cache_path.exists() {
// copy the file into place
// todo: handle these errors
if let Some(parent) = cache_path.parent() {
if let Err(e) = std::fs::create_dir_all(parent) {
error!("cannot create cache dir {:?} to copy into: {:?}", parent, e);
return reply.error(EIO);
}
}
let remote_path = self.remote_dir.join(entry_path);
debug!(
"copying from {:?} to {:?}",
remote_path, self.cache_tmp_file
);
if let Err(e) = std::fs::copy(&remote_path, &self.cache_tmp_file) {
error!(
"failed to copy from {:?} to {:?}: {:?}",
&remote_path, self.cache_tmp_file, e
);
return reply.error(EIO);
}
debug!("moving from {:?} to {:?}", self.cache_tmp_file, cache_path);
if let Err(e) = std::fs::rename(&self.cache_tmp_file, &cache_path) {
error!(
"failed to move from {:?} to {:?}: {:?}",
self.cache_tmp_file, cache_path, e
);
// try to delete it in case it partially moved or something (shouldn't happen, should always be atomic)
// but ignore any error deleting it because what could we do anyway?
std::fs::remove_file(cache_path).ok();
return reply.error(EIO);
}
}
match oo.open(cache_path) {
Err(e) => reply.error(errhandle(e)),
Ok(f) => {
self.opened_files.insert(ino, FileHandle::new(f));
reply.opened(ino, 0);
}
}
}
fn read(
&mut self,
_req: &Request,
ino: u64,
fh: u64,
offset: i64,
size: u32,
reply: ReplyData,
) {
debug!("read: ino: {ino}, fh: {fh}, offset: {offset}, size: {size}");
let f = match self.opened_files.get(&fh) {
None => return reply.error(EIO),
Some(x) => x,
};
let size = size as usize;
let b = &mut self.read_buffer;
if b.len() != size {
b.resize(size, 0);
}
use std::os::unix::fs::FileExt;
let mut bo = 0;
while bo < size {
match f.read_at(&mut b[bo..], offset as u64) {
Err(e) => return reply.error(errhandle(e)),
Ok(0) => {
b.resize(bo, 0);
break;
}
Ok(ret) => {
bo += ret;
}
};
}
reply.data(&b[..]);
}
fn release(
&mut self,
_req: &Request,
ino: u64,
fh: u64,
_flags: u32,
_lock_owner: u64,
_flush: bool,
reply: ReplyEmpty,
) {
debug!("release: ino: {ino}, fh: {fh}");
// we have 2 choices here:
// 1. optimize for many simultaneously opened files in which case we'd get_mut, and then remove if required
// 2. optimize for normally only 1 simultaneously opened file, so removing and then only adding back if keeping is best
// we pick #2
let mut file_handle = match self.opened_files.remove(&fh) {
None => return reply.error(EIO),
Some(x) => x,
};
if !file_handle.close() {
self.opened_files.insert(fh, file_handle);
}
reply.ok();
}
fn opendir(&mut self, _req: &Request, ino: u64, flags: u32, reply: ReplyOpen) {
debug!("opendir: ino: {ino}, flags: {flags}");
match self.tree.getattr(ino) {
None => reply.error(ENOENT),
Some(attr) => reply.opened(attr.ino, 0),
}
}
fn readdir(
&mut self,
_req: &Request,
ino: u64,
fh: u64,
offset: i64,
mut reply: ReplyDirectory,
) {
debug!("readdir: ino: {ino}, fh: {fh}, offset: {offset}");
let (dir, children) = match self.tree.folder(ino) {
None => return reply.error(EIO),
Some(x) => x,
};
if offset == 0
&& reply.add(
dir.attr.ino,
1,
FileType::Directory,
OsStr::from_bytes(b"."),
)
{
return reply.ok();
}
if offset <= 1 && reply.add(dir.parent, 2, FileType::Directory, OsStr::from_bytes(b"..")) {
return reply.ok();
}
let offset = if offset <= 1 { 0 } else { offset as usize - 2 };
for (i, (name, ino)) in children.iter().enumerate().skip(offset) {
let file = match self.tree.file(*ino) {
Some(file) => file,
None => {
error!("should be impossible to not be able to find a child");
return reply.error(EIO);
}
};
// i + 3 means the index of the next entry
let offset = (i + 3) as i64;
debug!(
"sending ino: {}, offset: {}, kind: {:?}, name: {:?}",
*ino, offset, file.attr.kind, name
);
if reply.add(*ino, offset, file.attr.kind, name) {
break;
}
}
reply.ok();
}
fn releasedir(&mut self, _req: &Request, ino: u64, fh: u64, flags: u32, reply: ReplyEmpty) {
debug!("releasedir: ino: {ino}, fh: {fh}, flags: {flags}");
// or could just always return ok() ?
match self.tree.file(ino) {
None => reply.error(EIO),
Some(_) => reply.ok(),
};
}
fn readlink(&mut self, _req: &Request, ino: u64, reply: ReplyData) {
debug!("readlink: ino: {ino}");
let (_, link) = match self.tree.symlink(ino) {
None => return reply.error(ENOENT),
Some(x) => x,
};
reply.data(link.as_bytes());
}
}
fn main() {
env_logger::init();
let mut args = env::args_os().skip(1);
if args.next() != Some(OsStr::from_bytes(b"-o").to_os_string()) {
panic!("-o must be second argument");
}
let mut cmd_opts = "ro".to_string();
let mut cache_dir = "".to_string();
let mut default_permissions = true;
let opts = args.next().expect("found -o but missing opts");
let opts = opts.to_str().expect("non-utf8 opts").split(',');
for opt in opts {
if opt.starts_with("cache_dir=") {
let mut split_opt = opt.splitn(2, '=');
if let Some(dir) = split_opt.nth(1) {
cache_dir.clear();
cache_dir.push_str(dir);
}
continue;
}
match opt {
"ro" => (),
"no_default_permissions" => default_permissions = false,
"rw" => panic!("rw is not supported"),
opt => {
cmd_opts.push(',');
cmd_opts.push_str(opt);
}
}
}
if cache_dir.is_empty() {
panic!("must supply cache_dir=/path/to/cache to -o")
}
if !cmd_opts.contains(",fsname=") {
cmd_opts.push_str(",fsname=cachefs");
}
if default_permissions && !cmd_opts.contains(",default_permissions,") {
cmd_opts.push_str(",default_permissions");
}
let remote_dir = PathBuf::from(args.next().expect("missing dir"));
let mountpoint = args.next().expect("missing mountpoint");
let cache_dir = PathBuf::from(cache_dir);
debug!(
"mounting {:?} on {:?} with cache_dir: {:?}, opts: {cmd_opts}",
remote_dir, mountpoint, cache_dir
);
std::fs::create_dir_all(&cache_dir).expect("could not create cache_dir");
let tree = FileTree::load_or_build(remote_dir.deref(), cache_dir.deref())
.expect("could not build file tree");
let cache = CacheFs::new(remote_dir, cache_dir, tree);
let cmd_opts = OsString::from(cmd_opts);
let options = [OsStr::new("-o"), cmd_opts.as_os_str()];
fuse::mount(cache, mountpoint, &options).expect("mount failed");
}