From ff1b918e82bfe657026f20e29c8b171614efff3c Mon Sep 17 00:00:00 2001 From: moparisthebest Date: Wed, 3 Aug 2022 22:23:09 -0400 Subject: [PATCH] First working version --- .gitignore | 10 + Cargo.lock | 257 ++++++++++++++++++++ Cargo.toml | 28 +++ LICENSE.md | 660 ++++++++++++++++++++++++++++++++++++++++++++++++++++ src/main.rs | 649 +++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 1604 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 LICENSE.md create mode 100644 src/main.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..54b3647 --- /dev/null +++ b/.gitignore @@ -0,0 +1,10 @@ +/target/ +/target +**/*.rs.bk +.idea +**/*.kate-swp +**/out/ +**/core.* +todo.txt +conflict/ +orig/ \ No newline at end of file diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..8cbe220 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,257 @@ +# This file is automatically 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+edition = "2021" +authors = ["moparisthebest "] + +description = "caching fs to use over immutable network filesystems" +repository = "https://code.moparisthebest.com/moparisthebest/cache-fs" +keywords = ["cache", "filesystem", "nfs"] + +license = "AGPL-3.0-or-later" +readme = "README.md" + +include = [ + "**/*.rs", + "Cargo.toml", + "*.md", +] + +[dependencies] +#fuse = "0.3" +fuse = { git = "https://github.com/zargony/fuse-rs" } +env_logger = "0.6" +libc = "0.2" +log = "0.4" + +serde = { version="1.0", features = [ "derive" ] } +bincode = "1.3" diff --git a/LICENSE.md b/LICENSE.md new file mode 100644 index 0000000..cba6f6a --- /dev/null +++ b/LICENSE.md @@ -0,0 +1,660 @@ +### GNU AFFERO GENERAL PUBLIC LICENSE + +Version 3, 19 November 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. + + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +### Preamble + +The GNU Affero General Public License is a free, 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If the Program as you +received it, or any part of it, contains a notice stating that it is +governed by this License along with a term that is a further +restriction, you may remove that term. If a license document contains +a further restriction but permits relicensing or conveying under this +License, you may add to a covered work material governed by the terms +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. + + + Copyright (C) + + 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 . + +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 . diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..0f7ce7f --- /dev/null +++ b/src/main.rs @@ -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 = std::result::Result; +type SerdeResult = std::result::Result>; + +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), +} + +#[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, +} + +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 { + 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 { + 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, + 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)> { + 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, + read_buffer: Vec, +} + +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 { + 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 { + 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"); +}