├── .gitignore ├── src ├── models │ ├── mod.rs │ └── docker.rs ├── commands │ ├── mod.rs │ ├── run.rs │ └── pull.rs ├── storage │ ├── mod.rs │ ├── container.rs │ └── image.rs ├── clap.yaml └── main.rs ├── docs ├── logo.png └── screenshots │ ├── run_nginx.png │ ├── pull_hello_world.png │ └── run_hello_world.png ├── Cargo.toml ├── README.md ├── LICENSE └── Cargo.lock /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | -------------------------------------------------------------------------------- /src/models/mod.rs: -------------------------------------------------------------------------------- 1 | pub mod docker; 2 | -------------------------------------------------------------------------------- /docs/logo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/KernelErr/shallow-container/HEAD/docs/logo.png -------------------------------------------------------------------------------- /src/commands/mod.rs: -------------------------------------------------------------------------------- 1 | pub mod pull; 2 | pub mod run; 3 | 4 | pub use self::pull::pull; 5 | pub use self::run::run; 6 | -------------------------------------------------------------------------------- /docs/screenshots/run_nginx.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/KernelErr/shallow-container/HEAD/docs/screenshots/run_nginx.png -------------------------------------------------------------------------------- /docs/screenshots/pull_hello_world.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/KernelErr/shallow-container/HEAD/docs/screenshots/pull_hello_world.png -------------------------------------------------------------------------------- /docs/screenshots/run_hello_world.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/KernelErr/shallow-container/HEAD/docs/screenshots/run_hello_world.png -------------------------------------------------------------------------------- /src/storage/mod.rs: -------------------------------------------------------------------------------- 1 | pub const IMAGE_PATH: &str = "/var/lib/shallow/image"; 2 | pub const CONTAINER_PATH: &str = "/var/lib/shallow/container"; 3 | 4 | pub mod container; 5 | pub mod image; 6 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "shallow-container" 3 | version = "0.1.0" 4 | edition = "2018" 5 | 6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html 7 | 8 | [dependencies] 9 | serde = "1.0" 10 | sscanf = "0.1" 11 | nanoid = "0.4" 12 | serde_json = "1.0" 13 | reqwest = { version = "0.11", features = ["json"] } 14 | clap = { version = "3.0.0-beta.4", features = ["yaml"] } 15 | tokio = { version = "1", features = ["full"] } 16 | 17 | log = "0.4" 18 | moe_logger = "0.2" 19 | 20 | oci-spec = "0.5.1" 21 | unshare = "0.7.0" 22 | 23 | tar = "0.4" 24 | flate2 = "1.0" -------------------------------------------------------------------------------- /src/clap.yaml: -------------------------------------------------------------------------------- 1 | name: shallow-container 2 | version: "0.1.0" 3 | author: LI Rui 4 | about: Simple application container for linux written in Rust. 5 | subcommands: 6 | - pull: 7 | about: Pull image 8 | args: 9 | - image: 10 | about: Image name 11 | required: true 12 | index: 1 13 | 14 | - run: 15 | about: Run container 16 | args: 17 | - image: 18 | about: Image name 19 | required: true 20 | index: 1 21 | - share_net: 22 | long: Sn 23 | about: Share NET namespace -------------------------------------------------------------------------------- /src/main.rs: -------------------------------------------------------------------------------- 1 | use clap::{load_yaml, App}; 2 | use log::{debug, error}; 3 | use moe_logger::LogConfig; 4 | 5 | mod commands; 6 | mod models; 7 | mod storage; 8 | use commands::pull; 9 | use commands::run; 10 | 11 | #[tokio::main] 12 | async fn main() { 13 | let log_config = LogConfig::default(); 14 | moe_logger::init(log_config); 15 | 16 | let clap_yaml = load_yaml!("clap.yaml"); 17 | let matches = App::from(clap_yaml).get_matches(); 18 | 19 | debug!("{:?}", matches); 20 | 21 | let res = match matches.subcommand() { 22 | Some(("pull", sub_m)) => pull(sub_m).await, 23 | Some(("run", sub_m)) => run(sub_m).await, 24 | _ => false, 25 | }; 26 | 27 | if !res { 28 | error!("Command exited with error"); 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | ![Shallow Container](./docs/logo.png) 4 | 5 | Shallow Container is a light-weight container tool written in Rust. It is totally for proof-of-concept and may not suit for production environment. 6 | 7 | Shallow Container 是一款Rust编写的轻量级容器工具，用于探索在Rust中实现管理Linux命名空间等功能的可能性。请注意，本程序仅作为学习用途，其设计可能不适合生产用途，请勿在生产环境下使用。 8 | 9 | 在开发本项目时并没有考虑到诸多方面，致使本项目更像是一个玩具，如果需要细致了解Docker的原理，推荐研究Linux Namespace、cgroups、aufs等知识。 10 | 11 | ## 概念 12 | 13 | Rust是一门非常棒的编程语言，在这入门后不到一年的时间，我逐渐感受到了Rust的魅力，并尝试以Rust为切入点去理解后端框架、操作系统等应用。Shallow Container（简称SC）是100% Rust编写的轻型容器工具，目前支持下面的功能： 14 | 15 | - 从Docker Hub下载镜像 16 | - 启动镜像（可选和主机共享Net命名空间） 17 | 18 | SC在设计上一定程度参考了[mocker](https://github.com/tonybaloney/mocker)，我和mocker的作者一样花了两天时间写了这样一个程序。程序功能完全比不上Docker的n分之一，在实际执行的过程中也可能有不少问题，不过这已经达到了探索基础知识的目的，后续更深入的容器原理就交给大家和我独自去研究了。 19 | 20 | SC的所有文件均保存在`/var/lib/shallow`中，如果需要释放空间，直接删除即可。 21 | 22 | ## pull 23 | 24 | 假设程序编译位置为`./target/debug/shallow-container`，如果想pull一个镜像，请执行下面的命令： 25 | 26 | ```bash 27 | $ sudo ./target/debug/shallow-container pull library/hello-world:latest 28 | ``` 29 | 30 | Image需要是完整的scope/image:tag格式，如果为官方镜像，scope请设置为`library`。你大概会看到这样的输出： 31 | 32 | ![Pull Hello World](./docs/screenshots/pull_hello_world.png) 33 | 34 | ## run 35 | 36 | 类似的，如果想启动一个容器，请执行下面的命令，如果没找到镜像会先尝试pull： 37 | 38 | ```bash 39 | $ sudo ./target/debug/shallow-container run library/hello-world:latest 40 | ``` 41 | 42 | 默认情况下，SC会为容器使用独立的PID、Net等命名空间。由于SC设计上未考虑到网络相关的功能，所以如果你想运行Nginx容器，可以加上`--Sn`来和主机共享网络命名空间。 43 | 44 | ```bash 45 | $ sudo ./target/debug/shallow-container run --Sn nginxinc/nginx-unprivileged:latest 46 | ``` 47 | 48 | 可以预期的输出如下： 49 | 50 | ![Run Nginx](./docs/screenshots/run_nginx.png) 51 | 52 | 同时你可以访问`http://127.0.0.1:8080`，你应该能够看到Nginx经典的默认网页。 53 | 54 | ## License 55 | 56 | Shallow Container is available under terms of Apache-2.0. 57 | -------------------------------------------------------------------------------- /src/models/docker.rs: -------------------------------------------------------------------------------- 1 | use serde::{Deserialize, Serialize}; 2 | use serde_json::Value; 3 | use std::collections::HashMap; 4 | 5 | #[derive(Serialize, Deserialize, Debug)] 6 | pub struct DockerToken { 7 | pub token: String, 8 | pub access_token: String, 9 | pub expires_in: i32, 10 | pub issued_at: String, 11 | } 12 | 13 | #[derive(Serialize, Deserialize, Debug)] 14 | pub struct DockerImageConfig { 15 | architecture: String, 16 | pub config: DockerContainerConfig, 17 | container: Option, 18 | container_config: Option, 19 | created: String, 20 | docker_version: Option, 21 | history: Vec, 22 | os: String, 23 | rootfs: DockerImageRootfs, 24 | } 25 | 26 | #[allow(non_snake_case)] 27 | #[derive(Serialize, Deserialize, Debug)] 28 | pub struct DockerContainerConfig { 29 | Hostname: Option, 30 | Domainname: Option, 31 | User: Option, 32 | AttachStdin: Option, 33 | AttachStdout: Option, 34 | AttachStderr: Option, 35 | ExposedPorts: Option, 36 | Tty: Option, 37 | OpenStdin: Option, 38 | StdinOnce: Option, 39 | pub Env: Vec, 40 | pub Cmd: Vec, 41 | Image: Option, 42 | Volumes: Option>, 43 | WorkingDir: Option, 44 | pub Entrypoint: Option>, 45 | OnBuild: Option>, 46 | Labels: Option>, 47 | StopSignal: Option, 48 | } 49 | 50 | #[derive(Serialize, Deserialize, Debug)] 51 | pub struct DockerImageHistory { 52 | created: String, 53 | created_by: String, 54 | empty_layer: Option, 55 | } 56 | 57 | #[derive(Serialize, Deserialize, Debug)] 58 | pub struct DockerImageRootfs { 59 | r#type: String, 60 | diff_ids: Vec, 61 | } 62 | -------------------------------------------------------------------------------- /src/storage/container.rs: -------------------------------------------------------------------------------- 1 | use crate::storage::image::load_manifest; 2 | use crate::storage::{CONTAINER_PATH, IMAGE_PATH}; 3 | use flate2::read::GzDecoder; 4 | use log::{error, info}; 5 | use std::fs::{create_dir_all, File}; 6 | use tar::Archive; 7 | 8 | pub fn extract_image( 9 | image: &str, 10 | tag: &str, 11 | name: &str, 12 | ) -> Result> { 13 | let manifest = match load_manifest(image, tag) { 14 | Ok(manifest) => manifest, 15 | Err(e) => return Err(e), 16 | }; 17 | let path = format!("{}/{}", CONTAINER_PATH, name); 18 | match create_dir_all(path.clone()) { 19 | Ok(_) => { 20 | let layers = manifest.layers(); 21 | for layer in layers.iter() { 22 | let digest = layer.digest(); 23 | let layer_path = format!("{}/{}/{}/layers/{}", IMAGE_PATH, image, tag, digest); 24 | let layer_file = match File::open(layer_path) { 25 | Ok(file) => file, 26 | Err(e) => { 27 | error!("Failed to open layer file: {}", e); 28 | return Err(Box::new(e)); 29 | } 30 | }; 31 | let gz_decoder = GzDecoder::new(layer_file); 32 | let mut tar_archive = Archive::new(gz_decoder); 33 | match tar_archive.unpack(path.clone()) { 34 | Ok(_) => { 35 | info!("Successfully extracted layer {}", digest); 36 | } 37 | Err(e) => { 38 | error!("Failed to extract layer {}: {}", digest, e); 39 | return Err(Box::new(e)); 40 | } 41 | } 42 | } 43 | } 44 | Err(e) => { 45 | error!("Failed to create container directory: {}", e); 46 | return Err(Box::new(e)); 47 | } 48 | } 49 | Ok(path) 50 | } 51 | -------------------------------------------------------------------------------- /src/commands/run.rs: -------------------------------------------------------------------------------- 1 | use crate::commands::pull::pull_image; 2 | use crate::storage::container::extract_image; 3 | use crate::storage::image::load_config; 4 | use crate::storage::IMAGE_PATH; 5 | use clap::ArgMatches; 6 | use log::{error, info}; 7 | use nanoid::nanoid; 8 | use std::path::Path; 9 | use unshare; 10 | use unshare::Namespace; 11 | 12 | pub async fn run(arg: &ArgMatches) -> bool { 13 | let image = arg.value_of("image").unwrap(); 14 | let (scope, image, tag) = match sscanf::scanf!(image, "{}/{}:{}", String, String, String) { 15 | Some((scope, image, tag)) => (scope, image, tag), 16 | None => { 17 | error!("Invalid image format: {}", image); 18 | return false; 19 | } 20 | }; 21 | 22 | if !Path::new(&format!("{}/{}/{}", IMAGE_PATH, image, tag)).exists() { 23 | info!("Image not found, trying to pull it"); 24 | if !pull_image(scope, image.clone(), tag.clone()).await { 25 | return false; 26 | }; 27 | } 28 | 29 | let config = match load_config(&image, &tag) { 30 | Ok(config) => config, 31 | Err(_) => { 32 | return false; 33 | } 34 | }; 35 | let container_name = nanoid!(); 36 | let path = match extract_image(&image, &tag, &container_name) { 37 | Ok(path) => path, 38 | Err(_) => { 39 | return false; 40 | } 41 | }; 42 | 43 | // commands & envs 44 | let commands = config.config.Cmd; 45 | if commands.is_empty() { 46 | error!("No commands found in config"); 47 | return false; 48 | } 49 | let entry_point = config.config.Entrypoint; 50 | let mut cmd = match entry_point { 51 | Some(ep) => { 52 | let mut cmd = unshare::Command::new(ep[0].clone()); 53 | for entry in ep.iter().skip(1) { 54 | cmd.arg(entry); 55 | } 56 | for c in &commands { 57 | cmd.arg(c); 58 | } 59 | cmd 60 | } 61 | None => { 62 | let mut cmd = unshare::Command::new(commands[0].clone()); 63 | for c in commands.iter().skip(1) { 64 | cmd.arg(c); 65 | } 66 | cmd 67 | } 68 | }; 69 | cmd.chroot_dir(path); 70 | for env in config.config.Env { 71 | let mut split = env.split('='); 72 | let key = split.next().unwrap(); 73 | let value = split.next().unwrap(); 74 | cmd.env(key, value); 75 | } 76 | 77 | // namespaces 78 | let mut namespaces = vec![ 79 | Namespace::Pid, 80 | Namespace::Uts, 81 | Namespace::Ipc, 82 | Namespace::Mount, 83 | Namespace::User, 84 | ]; 85 | if !arg.is_present("share_net") { 86 | namespaces.push(Namespace::Net); 87 | } 88 | cmd.unshare(&namespaces); 89 | 90 | cmd.close_fds(..); 91 | 92 | let mut child = match cmd.spawn() { 93 | Ok(child) => { 94 | info!("Started container {}", container_name); 95 | child 96 | } 97 | Err(e) => { 98 | error!("Failed to spawn process: {}", e); 99 | return false; 100 | } 101 | }; 102 | 103 | child.wait().unwrap(); 104 | true 105 | } 106 | -------------------------------------------------------------------------------- /src/storage/image.rs: -------------------------------------------------------------------------------- 1 | use crate::models::docker::DockerImageConfig; 2 | use crate::storage::IMAGE_PATH; 3 | use log::error; 4 | use oci_spec::image::ImageManifest; 5 | use reqwest::RequestBuilder; 6 | use std::fs::{create_dir_all, File}; 7 | use std::io::prelude::*; 8 | use std::io::{copy, Cursor}; 9 | 10 | pub fn store_manifest( 11 | image: &str, 12 | tag: &str, 13 | content: &str, 14 | ) -> Result<(), Box> { 15 | let path = format!("{}/{}/{}", IMAGE_PATH, image, tag); 16 | match create_dir_all(path.clone()) { 17 | Ok(_) => { 18 | let output = format!("{}/{}", path, "manifest.json"); 19 | let mut f = match File::create(output) { 20 | Ok(f) => f, 21 | Err(e) => { 22 | error!("Failed to write manifest: {}", e); 23 | return Err(Box::new(e)); 24 | } 25 | }; 26 | match f.write_all(content.as_bytes()) { 27 | Ok(_) => Ok(()), 28 | Err(e) => { 29 | error!("Failed to write manifest: {}", e); 30 | Err(Box::new(e)) 31 | } 32 | } 33 | } 34 | Err(e) => { 35 | error!("Failed to create manifest directory: {}", e); 36 | Err(Box::new(e)) 37 | } 38 | } 39 | } 40 | 41 | pub fn load_manifest(image: &str, tag: &str) -> Result> { 42 | let path = format!("{}/{}/{}/manifest.json", IMAGE_PATH, image, tag); 43 | match ImageManifest::from_file(path) { 44 | Ok(manifest) => Ok(manifest), 45 | Err(e) => { 46 | error!("Failed to load manifest: {}", e); 47 | Err(Box::new(e)) 48 | } 49 | } 50 | } 51 | 52 | pub fn store_config( 53 | image: &str, 54 | tag: &str, 55 | content: &str, 56 | ) -> Result<(), Box> { 57 | let path = format!("{}/{}/{}", IMAGE_PATH, image, tag); 58 | match create_dir_all(path.clone()) { 59 | Ok(_) => { 60 | let output = format!("{}/{}", path, "config.json"); 61 | let mut f = match File::create(output) { 62 | Ok(f) => f, 63 | Err(e) => { 64 | error!("Failed to write image config: {}", e); 65 | return Err(Box::new(e)); 66 | } 67 | }; 68 | match f.write_all(content.as_bytes()) { 69 | Ok(_) => Ok(()), 70 | Err(e) => { 71 | error!("Failed to write image config: {}", e); 72 | Err(Box::new(e)) 73 | } 74 | } 75 | } 76 | Err(e) => { 77 | error!("Failed to create image config directory: {}", e); 78 | Err(Box::new(e)) 79 | } 80 | } 81 | } 82 | 83 | pub fn load_config( 84 | image: &str, 85 | tag: &str, 86 | ) -> Result> { 87 | let path = format!("{}/{}/{}/config.json", IMAGE_PATH, image, tag); 88 | let mut file = match File::open(path) { 89 | Ok(file) => file, 90 | Err(e) => { 91 | error!("Failed to load image config: {}", e); 92 | return Err(Box::new(e)); 93 | } 94 | }; 95 | let mut data = String::new(); 96 | match file.read_to_string(&mut data) { 97 | Ok(_) => { 98 | let image_config: DockerImageConfig = match serde_json::from_str(&data) { 99 | Ok(image_config) => image_config, 100 | Err(e) => { 101 | error!("Failed to parse image config: {}", e); 102 | return Err(Box::new(e)); 103 | } 104 | }; 105 | Ok(image_config) 106 | } 107 | Err(e) => { 108 | error!("Failed to load image config: {}", e); 109 | Err(Box::new(e)) 110 | } 111 | } 112 | } 113 | 114 | pub async fn save_layer( 115 | image: &str, 116 | tag: &str, 117 | digest: &str, 118 | req: RequestBuilder, 119 | ) -> Result<(), Box> { 120 | let path = format!("{}/{}/{}/layers", IMAGE_PATH, image, tag); 121 | match create_dir_all(path.clone()) { 122 | Ok(_) => { 123 | let resp = req.send().await?; 124 | let mut dest = { 125 | let output = format!("{}/{}", path, digest); 126 | File::create(output)? 127 | }; 128 | let mut content = Cursor::new(resp.bytes().await?); 129 | copy(&mut content, &mut dest)?; 130 | Ok(()) 131 | } 132 | Err(e) => { 133 | error!("Failed to create layer directory: {}", e); 134 | Err(Box::new(e)) 135 | } 136 | } 137 | } 138 | -------------------------------------------------------------------------------- /src/commands/pull.rs: -------------------------------------------------------------------------------- 1 | use crate::models::docker::DockerToken; 2 | use crate::storage::image::{load_config, load_manifest, save_layer, store_config, store_manifest}; 3 | use clap::ArgMatches; 4 | use log::{debug, error, info}; 5 | use oci_spec::image::ImageManifest; 6 | use reqwest; 7 | use reqwest::header::{ACCEPT, AUTHORIZATION}; 8 | 9 | struct PullRequest { 10 | image: String, 11 | tag: String, 12 | scope: String, 13 | token: Option, 14 | } 15 | 16 | impl PullRequest { 17 | pub fn new(scope: String, image: String, tag: String) -> PullRequest { 18 | PullRequest { 19 | image, 20 | tag, 21 | scope, 22 | token: None, 23 | } 24 | } 25 | 26 | pub async fn docker_hub_auth(&mut self) -> PullRequest { 27 | info!("Auth to Docker Hub"); 28 | let url = format!( 29 | "https://auth.docker.io/token?service=registry.docker.io&scope=repository:{}/{}:pull", 30 | self.scope, self.image 31 | ); 32 | let resp = reqwest::get(url).await; 33 | match resp { 34 | Ok(resp) => match resp.json::().await { 35 | Ok(data) => { 36 | self.token = Some(data.token); 37 | PullRequest { 38 | image: self.image.clone(), 39 | tag: self.tag.clone(), 40 | scope: self.scope.clone(), 41 | token: self.token.clone(), 42 | } 43 | } 44 | Err(e) => { 45 | error!("Failed to parse Docker Token: {}", e); 46 | PullRequest { 47 | image: self.image.clone(), 48 | tag: self.tag.clone(), 49 | scope: self.scope.clone(), 50 | token: None, 51 | } 52 | } 53 | }, 54 | Err(e) => { 55 | error!("Failed to auth Docker Hub: {}", e); 56 | PullRequest { 57 | image: self.image.clone(), 58 | tag: self.tag.clone(), 59 | scope: self.scope.clone(), 60 | token: None, 61 | } 62 | } 63 | } 64 | } 65 | 66 | pub async fn docker_hub_manifest(&self) -> Result> { 67 | info!("Fetching image manifest"); 68 | let url = format!( 69 | "https://registry.hub.docker.com/v2/{}/{}/manifests/{}", 70 | self.scope, self.image, self.tag 71 | ); 72 | let client = reqwest::Client::new(); 73 | let resp = client 74 | .get(url) 75 | .header( 76 | AUTHORIZATION, 77 | format!("Bearer {}", self.token.clone().unwrap()), 78 | ) 79 | .header( 80 | ACCEPT, 81 | "application/vnd.docker.distribution.manifest.v2+json", 82 | ) 83 | .send() 84 | .await; 85 | match resp { 86 | Ok(resp) => { 87 | let text = match resp.text().await { 88 | Ok(text) => text, 89 | Err(e) => { 90 | error!("Failed to fetch manifest: {}", e); 91 | return Err(Box::new(e)); 92 | } 93 | }; 94 | debug!("{:?}", text); 95 | match store_manifest(&self.image, &self.tag, &text) { 96 | Ok(_) => {} 97 | Err(e) => { 98 | error!("Failed to store manifest: {}", e); 99 | return Err(e); 100 | } 101 | } 102 | match load_manifest(&self.image, &self.tag) { 103 | Ok(manifest) => { 104 | info!("Successfully fetched manifest"); 105 | Ok(manifest) 106 | } 107 | Err(e) => { 108 | error!("Failed to load manifest: {}", e); 109 | Err(e) 110 | } 111 | } 112 | } 113 | Err(e) => { 114 | error!("Failed to fetch manifest: {}", e); 115 | Err(Box::new(e)) 116 | } 117 | } 118 | } 119 | 120 | pub async fn fetch_layers( 121 | &self, 122 | manifest: ImageManifest, 123 | ) -> Result<(), Box> { 124 | let config_digest = manifest.config().digest(); 125 | let url = format!( 126 | "https://registry.hub.docker.com/v2/{}/{}/blobs/{}", 127 | self.scope, self.image, config_digest 128 | ); 129 | let client = reqwest::Client::new(); 130 | let resp = client 131 | .get(url) 132 | .header( 133 | AUTHORIZATION, 134 | format!("Bearer {}", self.token.clone().unwrap()), 135 | ) 136 | .send() 137 | .await; 138 | match resp { 139 | Ok(resp) => { 140 | let text = match resp.text().await { 141 | Ok(text) => text, 142 | Err(e) => { 143 | error!("Failed to fetch config: {}", e); 144 | return Err(Box::new(e)); 145 | } 146 | }; 147 | match store_config(&self.image, &self.tag, &text) { 148 | Ok(_) => {} 149 | Err(e) => { 150 | error!("Failed to store config: {}", e); 151 | return Err(e); 152 | } 153 | } 154 | match load_config(&self.image, &self.tag) { 155 | Ok(config) => { 156 | debug!("{:?}", config); 157 | info!("Successfully fetched image config"); 158 | } 159 | Err(e) => { 160 | error!("Bad image config format: {}", e); 161 | return Err(e); 162 | } 163 | } 164 | } 165 | Err(e) => { 166 | error!("Failed to fetch config: {}", e); 167 | return Err(Box::new(e)); 168 | } 169 | } 170 | 171 | info!("Fetching image layers"); 172 | let layers = manifest.layers(); 173 | for layer in layers.iter() { 174 | let digest = layer.digest(); 175 | let url = format!( 176 | "https://registry.hub.docker.com/v2/{}/{}/blobs/{}", 177 | self.scope, self.image, digest 178 | ); 179 | let client = reqwest::Client::new(); 180 | let req = client 181 | .get(url) 182 | .header( 183 | AUTHORIZATION, 184 | format!("Bearer {}", self.token.clone().unwrap()), 185 | ) 186 | .header(ACCEPT, "application/vnd.docker.image.rootfs.diff.tar.gzip"); 187 | info!("Fetching layer {}", digest); 188 | match save_layer(&self.image, &self.tag, digest, req).await { 189 | Ok(_) => { 190 | info!("Successfully fetched layer {}", digest); 191 | } 192 | Err(e) => { 193 | error!("Failed to fetch layer: {}", e); 194 | return Err(e); 195 | } 196 | } 197 | } 198 | Ok(()) 199 | } 200 | } 201 | 202 | pub async fn pull(arg: &ArgMatches) -> bool { 203 | let image = arg.value_of("image").unwrap(); 204 | let mut pull_request = match sscanf::scanf!(image, "{}/{}:{}", String, String, String) { 205 | Some((scope, image, tag)) => PullRequest::new(scope, image, tag), 206 | None => { 207 | error!("Invalid image format: {}", image); 208 | return false; 209 | } 210 | }; 211 | pull_request.docker_hub_auth().await; 212 | if pull_request.token.is_none() { 213 | return false; 214 | } 215 | let manifest = match pull_request.docker_hub_manifest().await { 216 | Ok(manifest) => manifest, 217 | Err(_) => { 218 | return false; 219 | } 220 | }; 221 | pull_request.fetch_layers(manifest).await.is_ok() 222 | } 223 | 224 | pub async fn pull_image(scope: String, image: String, tag: String) -> bool { 225 | let mut pull_request = PullRequest::new(scope, image, tag); 226 | pull_request.docker_hub_auth().await; 227 | if pull_request.token.is_none() { 228 | return false; 229 | } 230 | let manifest = match pull_request.docker_hub_manifest().await { 231 | Ok(manifest) => manifest, 232 | Err(_) => { 233 | return false; 234 | } 235 | }; 236 | pull_request.fetch_layers(manifest).await.is_ok() 237 | } 238 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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