Init commit

2026-02-19 14:46:58 +01:00
commit f45dde90d2
12 changed files with 993 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -0,0 +1,284 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
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+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
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+
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+
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+ "digest",
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+ "unicode-ident",
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+dependencies = [
+ "windows-link",
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+
+[[package]]
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--- a/Cargo.toml
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "rgit"
+version = "0.1.0"
+description = "Git implementation in Rust"
+edition = "2024"
+
+[toolchain]
+channel = "nightly"
+
+[dependencies]
+clap = { version = "4.5.59", features = ["derive"] }
+hex = "0.4.3"
+sha1 = "0.10.6"
+zlib-rs = "0.6.1"
--- a/src/git_fs/head.rs
+++ b/src/git_fs/head.rs
@@ -0,0 +1,51 @@
+use std::{
+    fs::File,
+    io::prelude::*,
+    path::Path,
+};
+
+use crate::GIT_DIR;
+use crate::git_fs::read_lines;
+
+#[derive(Debug)]
+pub struct Head {
+    pub ref_to: String,
+}
+
+impl Head {
+    pub fn load() -> Result<Self, ()> {
+        let path = Path::new(GIT_DIR).join("HEAD");
+
+        let mut lines = match read_lines(path) {
+            Err(_) => return Err(()),
+            Ok(lines) => lines,
+        };
+
+        let content = match lines.next() {
+            Some(Ok(line)) => line,
+            _ => return Err(()),
+        };
+
+        match content.split_once(": ") {
+            None => Err(()),
+            Some((_, r)) => Ok(Head { ref_to: String::from(r) })
+        }
+    }
+
+    pub fn save(&self) -> Result<(), ()> {
+        let path = Path::new(GIT_DIR).join("HEAD");
+        let mut content = String::from("ref: ");
+        content.push_str(&self.ref_to);
+        content.push_str("\n");
+
+        let mut file = match File::create(&path) {
+            Err(_) => return Err(()),
+            Ok(file) => file,
+        };
+
+        match file.write(content.as_bytes()) {
+            Err(_) => Err(()),
+            Ok(_) => Ok(()),
+        }
+    }
+}
--- a/src/git_fs/index.rs
+++ b/src/git_fs/index.rs
@@ -0,0 +1,56 @@
+use std::{
+    io::{
+        self,
+        Error,
+    },
+};
+
+use crate::GIT_DIR;
+
+#[derive(Debug)]
+pub struct IndexEntry {
+    file_size: u32,
+    hash: [u8; 20],
+    name: String,
+}
+
+impl IndexEntry {
+    fn from_bytes(bytes: Vec<u8>) -> io::Result<Self> {
+
+        return Err(Error::other("Not implemented"))
+    }
+}
+
+#[derive(Debug)]
+pub struct Index {
+    version: u32,
+    entries: Vec<IndexEntry>,
+}
+
+impl Index {
+    pub fn from_bytes(bytes: Vec<u8>) -> io::Result<Self> {
+        let magic: [u8; 4] = match bytes.first_chunk() {
+            None => return Err(Error::other("Error parsing index")),
+            Some(magic) => *magic,
+        };
+
+        match str::from_utf8(&magic) {
+            Ok("DIRC") => (),
+            _ => return Err(Error::other("Invalid index"))
+        };
+
+        let version_bytes = <[u8; 4]>::try_from(&bytes.as_slice()[4..8]).unwrap();
+        let version = u32::from_be_bytes(version_bytes);
+
+        let count_bytes = <[u8; 4]>::try_from(&bytes.as_slice()[8..12]).unwrap();
+        let count = u32::from_be_bytes(count_bytes);
+
+        let entries: Vec<IndexEntry> = Vec::with_capacity(usize::try_from(count).unwrap());
+
+        for i in 0..=count {
+
+        };
+
+        return Ok(Index { version, entries});
+    }
+}
--- a/src/git_fs/mod.rs
+++ b/src/git_fs/mod.rs
@@ -0,0 +1,62 @@
+use std::{
+    fs::File,
+    io::{
+        self, prelude::*, BufRead
+    }, path::Path, result
+};
+
+use crate::GIT_DIR;
+
+pub mod head;
+pub mod index;
+pub mod object;
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path> {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}
+
+pub struct Ref {
+    ref_name: String,
+    commit_hash: String,
+}
+
+impl Ref {
+    pub fn load(name: String) -> result::Result<Self, ()> {
+        let path = Path::new(GIT_DIR).join(&name);
+
+        let mut lines = match read_lines(path) {
+            Ok(lines) => lines,
+            Err(_) => return Err(()),
+        };
+
+        let content = match lines.next() {
+            Some(Ok(line)) => line,
+            _ => return Err(()),
+        };
+
+        Ok(
+            Ref {
+                ref_name: name,
+                commit_hash: content
+            }
+        )
+    }
+
+    pub fn save(&self) -> result::Result<(), ()> {
+        let path = Path::new(GIT_DIR)
+            .join("refs")
+            .join(&self.ref_name);
+
+        let mut file = match File::create(&path) {
+            Err(_) => return Err(()),
+            Ok(file) => file,
+        };
+
+        match file.write(self.commit_hash.as_bytes()) {
+            Err(_) => Err(()),
+            Ok(_) => Ok(()),
+        }
+    }
+}
--- a/src/git_fs/object.rs
+++ b/src/git_fs/object.rs
@@ -0,0 +1,306 @@
+use hex::encode;
+use sha1::{Sha1, Digest};
+use std::{
+    fs::{create_dir_all, File},
+    io::{
+        self,
+        prelude::*,
+        Error,
+    },
+    path::Path,
+};
+use zlib_rs::{
+    compress_bound, compress_slice, decompress_slice, DeflateConfig, InflateConfig, ReturnCode
+};
+
+use crate::GIT_DIR;
+
+#[derive(Debug)]
+pub enum GitObjectType {
+    Blob(Blob),
+    Tree(Tree),
+}
+
+impl GitObjectType {
+    pub fn load(name: String) -> io::Result<GitObjectType> {
+        let prefix = &name[..2];
+        let suffix = &name[2..];
+
+        let path = Path::new(GIT_DIR)
+            .join("objects")
+            .join(prefix)
+            .join(suffix);
+
+        if !path.exists() {
+            return Err(Error::other("Object does not exists"))
+        }
+
+        let mut file = File::open(path)?;
+        let mut content: Vec<u8> = Vec::new();
+        file.read_to_end(&mut content)?;
+
+        let mut header_buf = [0u8; 20];
+
+        match decompress_slice(&mut header_buf, &content, InflateConfig::default()) {
+            (_, ReturnCode::Ok) => (),
+            (_, ReturnCode::BufError) => (),
+            _ => return Err(Error::other("Error while decompressing"))
+        };
+
+        let header = match str::from_utf8(&header_buf) {
+            Ok(s) => match s.split_once("\0") {
+                None => return Err(Error::other("Invalid format")),
+                Some((header, _)) => header,
+            }
+            Err(_) => return Err(Error::other("Utf-8 error"))
+        };
+
+        let (t, size) = match header.split_once(" ") {
+            None => return Err(Error::other("Invalid format")),
+            Some((t, s_str)) => match s_str.parse::<usize>() {
+                Ok(s) => (t, s),
+                _ => return Err(Error::other("Invalid format")),
+            }
+        };
+        let header_size = header.len() + 1;
+        let total_size = size + header_size;
+
+        let mut deflated = vec![0u8; total_size];
+
+        match decompress_slice(&mut deflated, &content, InflateConfig::default()) {
+            (_, ReturnCode::Ok) => (),
+            _ => return Err(Error::other("Error while decompressing"))
+        }
+
+        let obj_bytes = deflated[header_size..].to_vec();
+
+        match t {
+            "blob" => Ok(GitObjectType::Blob(Blob{
+                    size,
+                    content: obj_bytes,
+            })),
+            "tree" => Ok(GitObjectType::Tree(Tree::from_bytes(obj_bytes)?)),
+            _ => Err(Error::other("Invalid type"))
+        }
+    }
+}
+
+pub trait GitObject {
+    fn raw(&self) -> Vec<u8>;
+    fn hash(&self, write: bool) -> io::Result<Vec<u8>>;
+    fn save(&self, hash: &String, bytes: Vec<u8>) -> io::Result<()> {
+        let mut compressed_buf = vec![0u8; compress_bound(bytes.len())];
+        let compressed = match compress_slice(&mut compressed_buf, &bytes, DeflateConfig::default()) {
+            (compressed, ReturnCode::Ok) => compressed,
+            (_, _) => return Err(Error::other("Error while compressing objects")),
+        };
+
+        let prefix = &hash[..2];
+        let suffix = &hash[2..];
+        let path = Path::new(GIT_DIR)
+            .join("objects")
+            .join(prefix);
+
+        create_dir_all(&path)?;
+
+        let mut file = File::create(&path.join(suffix))?;
+        file.write_all(&compressed)?;
+
+        Ok(())
+    }
+}
+
+#[derive(Debug)]
+pub struct Blob {
+    size: usize,
+    content: Vec<u8>,
+}
+
+impl Blob {
+    pub fn create(filename: String) -> io::Result<Self> {
+        let path = Path::new(&filename);
+
+        let mut file = File::open(path)?;
+
+        let mut content: Vec<u8> = Vec::new();
+        let read = file.read_to_end(&mut content)?;
+
+        Ok(Self { size: read, content })
+    }
+}
+
+impl GitObject for Blob {
+    fn raw(&self) -> Vec<u8> {
+        let mut header = String::from("blob ");
+        header.push_str(&self.size.to_string());
+        header.push_str("\0");
+
+        let mut to_compress: Vec<u8> = Vec::from(header.as_bytes());
+        to_compress.extend(&self.content);
+
+        return to_compress
+    }
+
+    fn hash(&self, write: bool) -> io::Result<Vec<u8>> {
+        let bytes = self.raw();
+
+        let mut hasher = Sha1::new();
+        hasher.update(&bytes);
+
+        let hash = hasher.finalize();
+
+        if write {
+            self.save(&encode(hash), bytes)?;
+        }
+
+        Ok(Vec::from(hash.as_slice()))
+    }
+}
+
+#[derive(Debug)]
+pub enum FileType {
+    Directory,
+    RegNonXFile,
+    RegExeFile,
+    SymLink,
+    GitLink,
+}
+
+#[derive(Debug)]
+pub struct TreeEntry {
+    pub ftype: FileType,
+    pub name: String,
+    pub hash: [u8; 20],
+}
+
+impl TreeEntry {
+    fn from_bytes(bytes: Vec<u8>) -> io::Result<Self> {
+        let split = match bytes.as_slice().iter().position(|x| *x == 0) {
+            None => return Err(Error::other("Error parsing tree object")),
+            Some(s) => s,
+        };
+
+        let (header, hash_v) = bytes.split_at(split+1);
+
+        if hash_v.len() != 20 {
+            return Err(Error::other("Digest length not valid"));
+        }
+
+        let hash: [u8; 20] = match hash_v.first_chunk() {
+            None => return Err(Error::other("Error parsing tree object")),
+            Some(h) => *h,
+        };
+
+
+        let header_str = match str::from_utf8(header) {
+            Ok(s) => s,
+            _ => return Err(Error::other("Error parsing tree object"))
+        };
+
+        let (ftype, name) = match header_str.split_once(" ") {
+            None => return Err(Error::other("Error parsing tree object")),
+            Some((l, name)) => {
+                let ftype = match l {
+                    "0040000" => FileType::Directory,
+                    "0100644" => FileType::RegNonXFile,
+                    "0100755" => FileType::RegExeFile,
+                    "0120000" => FileType::SymLink,
+                    "0160000" => FileType::GitLink,
+                    _ => return Err(Error::other("Invalid file type"))
+                };
+                (ftype, String::from(name))
+            }
+        };
+
+        return Ok(TreeEntry {
+            ftype,
+            name,
+            hash,
+        });
+    }
+
+    fn as_bytes(&self) -> Vec<u8> {
+        let mut header = String::from(match self.ftype {
+            FileType::Directory => "0040000",
+            FileType::RegNonXFile => "0100644",
+            FileType::RegExeFile => "0100755",
+            FileType::SymLink => "0120000",
+            FileType::GitLink => "0160000",
+        });
+        header.push_str(" ");
+        header.push_str(&self.name);
+        header.push_str("\0");
+
+        let mut bytes: Vec<u8> = Vec::from(header.as_bytes());
+        bytes.extend(self.hash);
+
+        return bytes;
+    }
+}
+
+#[derive(Debug)]
+pub struct Tree {
+    pub entries: Vec<TreeEntry>
+}
+
+impl Tree {
+    pub fn from_bytes(bytes: Vec<u8>) -> io::Result<Self> {
+        let mut entries: Vec<TreeEntry> = Vec::new();
+        let splits = bytes.iter()
+            .enumerate()
+            .filter_map(|(idx, b)| (*b == 0).then(|| idx + 21))
+            .collect::<Vec<usize>>();
+
+        let bytes_slice = bytes.as_slice();
+        let mut left_i = 0;
+
+        for split in splits {
+            let right_i = split;
+            let entry_r = &bytes_slice[left_i..right_i];
+
+            let entry = TreeEntry::from_bytes(Vec::from(entry_r))?;
+            entries.push(entry);
+            left_i = right_i;
+        }
+
+        return Ok(Tree { entries });
+    }
+
+    fn as_bytes(&self) -> Vec<u8> {
+        let mut result = Vec::new();
+        for entry in &self.entries {
+            result.extend(entry.as_bytes());
+        }
+
+        return result;
+    }
+}
+
+impl GitObject for Tree {
+    fn raw(&self) -> Vec<u8> {
+        let bytes = self.as_bytes();
+        let mut header = String::from("tree ");
+        header.push_str(&bytes.len().to_string());
+        header.push_str("\0");
+
+        let mut raw: Vec<u8> = Vec::from(header.as_bytes());
+        raw.extend(self.as_bytes());
+
+        return raw;
+    }
+
+    fn hash(&self, write: bool) -> io::Result<Vec<u8>> {
+        let bytes = self.raw();
+
+        let mut hasher = Sha1::new();
+        hasher.update(&bytes);
+
+        let hash = hasher.finalize();
+
+        if write {
+            self.save(&encode(hash), bytes)?;
+        }
+
+        return Ok(Vec::from(hash.as_slice()));
+    }
+}
--- a/src/main.rs
+++ b/src/main.rs
@@ -0,0 +1,65 @@
+use clap::Parser;
+// use std::{
+//     fs::File,
+//     io::prelude::*,
+//     path::Path,
+// };
+
+// use zlib_rs::{
+//     ReturnCode,
+//     DeflateConfig, compress_bound, compress_slice,
+// };
+
+use subcommands::{Subcommand, SubcommandType};
+
+mod subcommands;
+mod git_fs;
+
+const GIT_DIR: &str = ".rgit";
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about)]
+struct CmdArgs{
+    #[command(subcommand)]
+    cmd: SubcommandType,
+}
+
+fn main() {
+    let args = CmdArgs::parse();
+
+    match args.cmd.run() {
+        Err(str) => println!("Some error occured: {str}"),
+        Ok(str) => println!("{str}"),
+    }
+
+    // let path = Path::new("sample/file.txt");
+    // let display = path.display();
+
+    // let mut file = match File::open(&path) {
+    //     Err(err) => panic!("couldn't open {}: {}", display, err),
+    //     Ok(file) => file,
+    // };
+
+    // let mut s = String::new();
+    // match file.read_to_string(&mut s) {
+    //     Err(err) => panic!("couldn't read {}: {}", display, err),
+    //     Ok(_) => print!("content: \n{}", s),
+    // }
+
+    // let mut compressed_buf = vec![0u8; compress_bound(s.len())];
+    // let compressed = match compress_slice(&mut compressed_buf, s.as_bytes(), DeflateConfig::default()) {
+    //     (compressed, ReturnCode::Ok) => compressed,
+    //     (_, _) => panic!("Error while compressing"),
+    // };
+
+    // let path_w = Path::new("sample/write");
+    // file = match File::create(&path_w) {
+    //     Err(_) => panic!("error while opening file"),
+    //     Ok(file) => file,
+    // };
+
+    // match file.write_all(compressed) {
+    //     Err(_) => panic!("error while writing"),
+    //     Ok(_) => println!("File written"),
+    // }
+}
--- a/src/subcommands/hash_object.rs
+++ b/src/subcommands/hash_object.rs
@@ -0,0 +1,32 @@
+use clap::Parser;
+use hex::encode;
+
+use crate::{
+    git_fs::object::{Blob, GitObject},
+    subcommands::Subcommand
+};
+
+use super::CmdResult;
+
+#[derive(Parser, Debug)]
+pub struct HashObjectSubcommand {
+    #[arg(short)]
+    /// Save object in database
+    pub write: bool,
+
+    pub path: String,
+}
+
+impl Subcommand for HashObjectSubcommand {
+    fn run (&self) -> CmdResult {
+        let object = match Blob::create(self.path.clone()) {
+            Ok(o) => o,
+            _ => return Err("".to_owned())
+        };
+
+        match object.hash(self.write) {
+            Ok(hash) => Ok(encode(hash)),
+            _ => return Err("".to_owned())
+        }
+    }
+}
--- a/src/subcommands/init.rs
+++ b/src/subcommands/init.rs
@@ -0,0 +1,60 @@
+use clap::Parser;
+use std::{
+    fs,
+    path::Path
+};
+
+use crate::git_fs::head::Head;
+use crate::subcommands::Subcommand;
+use crate::GIT_DIR;
+
+use super::CmdResult;
+
+#[derive(Parser, Debug)]
+pub struct InitSubcommand {
+    directory: Option<String>,
+}
+
+impl Subcommand for InitSubcommand {
+    fn run(&self) -> CmdResult {
+        let path = match &self.directory {
+            None => Path::new("."),
+            Some(path) => Path::new(path),
+        }.join(GIT_DIR);
+
+        let new_repo = path.exists();
+
+        match fs::create_dir_all(&path) {
+            Err(_) => return Err("Error while creating dir".to_owned()),
+            Ok(()) => (),
+        };
+
+        let folders = [
+            "objects/info",
+            "objects/pack",
+            "refs/heads",
+            "refs/tags",
+        ];
+
+        for folder in folders {
+            match fs::create_dir_all(&path.join(folder)) {
+                Err(_) => return Err("".to_owned()),
+                Ok(()) => (),
+            };
+        }
+
+        let head = Head { ref_to: String::from("refs/heads/master") };
+        match head.save() {
+            Err(_) => return Err("".to_owned()),
+            Ok(()) => (),
+        };
+
+        let canonical_path = path.canonicalize();
+
+        if new_repo {
+            Ok(format!("Reinitialized exisiting Git repo in {}", canonical_path.unwrap().display()))
+        } else {
+            Ok(format!("Initialized empty Git repo in {}", canonical_path.unwrap().display()))
+        }
+    }
+}
--- a/src/subcommands/mod.rs
+++ b/src/subcommands/mod.rs
@@ -0,0 +1,33 @@
+use crate::subcommands::{
+    init::InitSubcommand,
+    test::TestSubcommand,
+    hash_object::HashObjectSubcommand,
+};
+
+mod hash_object;
+mod init;
+mod test;
+
+pub type CmdResult = Result<String, String>;
+
+#[derive(clap::Parser, Debug)]
+pub enum SubcommandType {
+    /// Init a Git repository
+    Init(InitSubcommand),
+    HashObject(HashObjectSubcommand),
+    Test(TestSubcommand),
+}
+
+pub trait Subcommand {
+    fn run(&self) -> CmdResult;
+}
+
+impl Subcommand for SubcommandType {
+    fn run(&self) -> CmdResult {
+        match self {
+            Self::Init(cmd) => cmd.run(),
+            Self::HashObject(cmd) => cmd.run(),
+            Self::Test(cmd) => cmd.run(),
+        }
+    }
+}
--- a/src/subcommands/test.rs
+++ b/src/subcommands/test.rs
@@ -0,0 +1,29 @@
+use clap::Parser;
+use std::fs;
+use crate::subcommands::Subcommand;
+
+use super::CmdResult;
+
+#[derive(Parser, Debug)]
+pub struct TestSubcommand {
+    path: String
+}
+
+impl Subcommand for TestSubcommand {
+    fn run(&self) -> CmdResult {
+        let metadata = match fs::metadata(self.path.clone()) {
+            Ok(metadata) => metadata,
+            _ => return Err(String::from("")),
+        };
+
+        let mtime = match metadata.modified() {
+            Ok(mtime) => mtime,
+            _ => return Err(String::from("")),
+        };
+
+        // mtime
+        println!("{mtime:?}");
+
+        Ok(String::from(""))
+    }
+}