Added doc comments modules

README.md

@@ -1,6 +1,8 @@
 # youki: A container runtime in Rust
 
-<img src="docs/youki.png" width="230" height="230">
+<p align="center">
+  <img src="docs/youki.png" width="230" height="230">
+</p>
 
 youki is an implementation of [runtime-spec](https://github.com/opencontainers/runtime-spec) in Rust, referring to [runc](https://github.com/opencontainers/runc).
 

src/cgroups/mod.rs

@@ -1,3 +1,7 @@
+//! Control groups provide a way of controlling groups of processes.
+//! Examples: controlling resource limits, execution priority, measuring resource usage,
+//! freezing, checkpointing and restarting groups of processes.
+
 pub mod common;
 mod test;
 pub mod v1;

src/command/mod.rs

@@ -1,3 +1,5 @@
+//! Contains a wrapper of syscalls for unit tests
+
 #[allow(clippy::module_inception)]
 mod command;
 pub mod linux;

src/cond.rs

@@ -1,3 +1,6 @@
+//! Conditional variable that performs busy waiting on lock
+//! and notifies when 
+
 use std::os::unix::io::RawFd;
 
 use anyhow::Result;
@@ -11,7 +14,8 @@ pub struct Cond {
 
 impl Cond {
     pub fn new() -> Result<Cond> {
-        let (rfd, wfd) = pipe2(OFlag::O_CLOEXEC)?;
+        // Sets as close-on-execution
+        let (rfd, wfd) = pipe2(OFlag::O_CLOEXEC)?; 
         Ok(Cond { rfd, wfd })
     }
 
@@ -22,6 +26,7 @@ impl Cond {
         close(self.rfd)?;
         Ok(())
     }
+
     pub fn notify(&self) -> Result<()> {
         close(self.rfd)?;
         close(self.wfd)?;

src/container/mod.rs

@@ -1,3 +1,5 @@
+//! Container management
+
 #[allow(clippy::module_inception)]
 mod container;
 mod state;

src/create.rs

@@ -1,4 +1,4 @@
-//! This handles the creation of a new container
+//! Handles the creation of a new container
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process;

src/logger.rs

@@ -1,3 +1,5 @@
+//! Default Youki Logger
+
 use std::env;
 use std::io::{stderr, Write};
 use std::path::PathBuf;
@@ -31,7 +33,7 @@ pub fn init(log_file: Option<PathBuf>) -> Result<()> {
                 .write(true)
                 .truncate(false)
                 .open(log_file_path)
-                .expect("fail opening log file ")
+                .expect("failed opening log file ")
         })
     });
     Ok(())
@@ -85,7 +87,7 @@ impl Log for YoukiLogger {
         if let Some(mut log_file) = LOG_FILE.get().unwrap().as_ref() {
             log_file.flush().expect("Failed to flush");
         } else {
-            stderr().flush().expect("Faild to flush");
+            stderr().flush().expect("Failed to flush");
         }
     }
 }

src/main.rs

@@ -91,7 +91,7 @@ fn main() -> Result<()> {
             // root directory given in commandline options
             let container_root = root_path.join(&kill.container_id);
             if !container_root.exists() {
-                bail!("{} doesn't exists.", kill.container_id)
+                bail!("{} doesn't exist.", kill.container_id)
             }
 
             // load container state from json file, and check status of the container
@@ -105,7 +105,7 @@ fn main() -> Result<()> {
                 std::process::exit(0)
             } else {
                 bail!(
-                    "{} counld not be killed because it was {:?}",
+                    "{} could not be killed because it was {:?}",
                     container.id(),
                     container.status()
                 )
@@ -117,7 +117,7 @@ fn main() -> Result<()> {
             // root directory given in commandline options
             let container_root = root_path.join(&delete.container_id);
             if !container_root.exists() {
-                bail!("{} doesn't exists.", delete.container_id)
+                bail!("{} doesn't exist.", delete.container_id)
             }
             // load container state from json file, and check status of the container
             // it might be possible that delete is invoked on a running container.
@@ -150,7 +150,7 @@ fn main() -> Result<()> {
                 std::process::exit(0)
             } else {
                 bail!(
-                    "{} counld not be deleted because it was {:?}",
+                    "{} could not be deleted because it was {:?}",
                     container.id(),
                     container.status()
                 )

src/namespaces.rs

@@ -1,3 +1,12 @@
+//! Namespaces provide isolation of resources for processes at a kernel level.
+//! The namespaces are: Mount (filesystem),
+//! Process (processes in a namespace have two PIDs, one for the global PID,
+//! which is used by the main system and the second one is for the child within the process tree),
+//! Interprocess Communication (Control or communication between processes),
+//! Network (which network devices can be seen by the processes in the namespace), User (User configs), 
+//! UTS (hostname and domain information, processes will think they're running on servers with different names),
+//! Cgroup (Resource limits, execution priority etc.)
+
 use anyhow::Result;
 use nix::{
     fcntl,

src/process/message.rs

@@ -1,4 +1,4 @@
-/// Used as wrapper for messages to be sent between child and parent processes
+/// Used as a wrapper for messages to be sent between child and parent processes
 #[derive(Debug)]
 pub enum Message {
     ChildReady = 0x00,

src/process/mod.rs

@@ -1,5 +1,5 @@
-//! This provides a thin wrapper around fork syscall,
-//! with enums and functions specific to youki implemented.
+//! Provides a thin wrapper around fork syscall,
+//! with enums and functions specific to youki implemented
 
 use std::time::Duration;
 
@@ -13,7 +13,7 @@ mod parent;
 pub use init::InitProcess;
 
 /// Used to describe type of process after fork.
-/// Parent and child processes mean same things as in normal fork call
+/// Parent and child processes mean the same thing as in a normal fork call
 /// InitProcess is specifically used to indicate the process which will run the command of container
 pub enum Process {
     Parent(parent::ParentProcess),

src/rootfs.rs

@@ -1,3 +1,6 @@
+//! During kernel initialization, a minimal replica of the ramfs filesystem is loaded, called rootfs.
+//! Most systems mount another filesystem over it
+
 use std::fs::OpenOptions;
 use std::fs::{canonicalize, create_dir_all, remove_file};
 use std::os::unix::fs::symlink;

src/signal.rs

@@ -1,3 +1,5 @@
+//! Returns *nix signal enum value from passed string
+
 use anyhow::{bail, Result};
 use nix::sys::signal::Signal;
 

src/start.rs

@@ -1,3 +1,5 @@
+//! Starts execution of the container
+
 use std::path::PathBuf;
 
 use anyhow::{bail, Result};
@@ -16,12 +18,12 @@ impl Start {
     pub fn exec(&self, root_path: PathBuf) -> Result<()> {
         let container_root = root_path.join(&self.container_id);
         if !container_root.exists() {
-            bail!("{} doesn't exists.", self.container_id)
+            bail!("{} doesn't exist.", self.container_id)
         }
         let container = Container::load(container_root)?.refresh_status()?;
         if !container.can_start() {
             let err_msg = format!(
-                "{} counld not be started because it was {:?}",
+                "{} could not be started because it was {:?}",
                 container.id(),
                 container.status()
             );

src/tty.rs

@@ -1,3 +1,5 @@
+//! tty (teletype) for user-system interaction
+
 use std::os::unix::fs::symlink;
 use std::os::unix::io::AsRawFd;
 use std::path::Path;

src/utils.rs

@@ -1,3 +1,5 @@
+//! Utility functionality
+
 use std::ffi::CString;
 use std::fs;
 use std::path::{Path, PathBuf};
@@ -14,7 +16,7 @@ pub trait PathBufExt {
 impl PathBufExt for PathBuf {
     fn as_in_container(&self) -> Result<PathBuf> {
         if self.is_relative() {
-            bail!("Relative path cannnot be converted to the path in the container.")
+            bail!("Relative path cannot be converted to the path in the container.")
         } else {
             let path_string = self.to_string_lossy().into_owned();
             Ok(PathBuf::from(path_string[1..].to_string()))
@@ -24,7 +26,7 @@ impl PathBufExt for PathBuf {
     fn join_absolute_path(&self, p: &Path) -> Result<PathBuf> {
         if !p.is_absolute() && !p.as_os_str().is_empty() {
             bail!(
-                "connnot join {:?} because it is not the absolute path.",
+                "connot join {:?} because it is not the absolute path.",
                 p.display()
             )
         }