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use std::ffi::{CString, OsStr};
use std::collections::HashMap;
use std::path::Path;
use regex::Regex;
use nix::unistd::{fork, execvp, ForkResult};
use nix::sys::wait::{waitpid, WaitStatus};
use colored::Colorize;
use ymlctx::context::{Context, CtxObj};
use crate::{TaskError, TaskErrorSource};
use super::Infrastructure;
pub struct Docker;
impl Infrastructure for Docker {
fn start<I>(&self, ctx_docker: Context, cmd: I) -> Result<String, TaskError>
where I: IntoIterator, I::Item: AsRef<std::ffi::OsStr>
{
start(ctx_docker, cmd)
}
}
pub fn inside_docker() -> bool {
let status = std::process::Command::new("grep").args(&["-q", "docker", "/proc/1/cgroup"])
.status().expect("I/O error");
match status.code() {
Some(code) => code==0,
None => unreachable!()
}
}
pub fn start<I, S>(ctx_docker: Context, cmd: I) -> Result<String, TaskError>
where I: IntoIterator<Item = S>, S: AsRef<OsStr>
{
let username;
let output = std::process::Command::new("id").output().unwrap();
let mut id_stdout = String::from_utf8_lossy(&output.stdout).into_owned();
let newline_len = id_stdout.trim_right().len();
id_stdout.truncate(newline_len);
let rule = Regex::new(r"^uid=(?P<uid>[0-9]+)(\((?P<user>\w+)\))? gid=(?P<gid>[0-9]+)(\((?P<group>\w+)\))?").unwrap();
if let Some(caps) = rule.captures(&id_stdout) {
username = caps.name("user").unwrap().as_str().to_owned();
}
else {
return Err(TaskError { msg: String::from("Failed to identify the user."), src: TaskErrorSource::Internal });
}
let mut userinfo = HashMap::new();
crate::copy_user_info(&mut userinfo, &username);
let home = format!("/home/{}", &username);
let mut docker_run: Vec<String> = ["docker", "run", "--init", "--rm"].iter().map(|&s| {s.to_owned()}).collect();
if let Some(CtxObj::Bool(interactive)) = ctx_docker.get("interactive") {
if *interactive {
docker_run.push(String::from("-it"));
}
else {
docker_run.push(String::from("-t"));
}
}
else {
docker_run.push(String::from("-it"));
}
docker_run.push(String::from("--cap-drop=ALL"));
if let Some(CtxObj::Str(runtime)) = ctx_docker.get("runtime") {
docker_run.push(format!("--runtime={}", runtime));
}
if let Some(CtxObj::Str(ipc_namespace)) = ctx_docker.get("ipc") {
docker_run.push(String::from("--ipc"));
docker_run.push(ipc_namespace.to_owned());
}
if let Some(CtxObj::Str(net_namespace)) = ctx_docker.get("network") {
docker_run.push(String::from("--network"));
docker_run.push(net_namespace.to_owned());
}
docker_run.push(String::from("-v"));
docker_run.push(format!("{}:{}/current-ro:ro", std::env::current_dir().unwrap().to_str().unwrap(), &home));
docker_run.push(String::from("-w"));
docker_run.push(format!("{}/current-ro", &home));
if let Some(CtxObj::Array(volumes)) = ctx_docker.get("volumes") {
for v in volumes {
if let CtxObj::Str(vol) = v {
if let Some(i) = vol.find(":") {
let (src, dst) = vol.split_at(i);
let suffix = if dst.ends_with(":ro") || dst.ends_with(":rw") || dst.ends_with(":z") || dst.ends_with(":Z") { "" } else { ":ro" };
if let Ok(src) = Path::new(src).canonicalize() {
docker_run.push(String::from("-v"));
docker_run.push(format!("{}{}{}", src.to_str().unwrap(), dst, suffix));
}
}
}
}
}
if let Some(CtxObj::Array(ports)) = ctx_docker.get("ports") {
for p in ports {
if let CtxObj::Str(port_map) = p {
docker_run.push(String::from("-p"));
docker_run.push(port_map.to_owned());
}
}
}
if let Some(CtxObj::Bool(gui)) = ctx_docker.get("gui") {
if *gui {
docker_run.extend::<Vec<String>>([
"--network", "host", "-e", "DISPLAY", "-v", "/tmp/.X11-unix:/tmp/.X11-unix:rw",
"-v", &format!("{}/.Xauthority:{}/.Xauthority:ro", userinfo["home_dir"], home),
].iter().map(|&s| {s.to_owned()}).collect());
}
}
if let Some(CtxObj::Array(envs)) = ctx_docker.get("environment") {
for v in envs {
if let CtxObj::Str(var) = v {
docker_run.push(String::from("-e"));
docker_run.push(var.to_owned());
}
}
}
if let Some(CtxObj::Str(impersonate)) = ctx_docker.get("impersonate") {
if impersonate == "dynamic" {
docker_run.push(String::from("--cap-add=SETUID"));
docker_run.push(String::from("--cap-add=SETGID"));
docker_run.push(String::from("--cap-add=CHOWN"));
docker_run.push(String::from("-u"));
docker_run.push(String::from("root"));
docker_run.push(String::from("-e"));
docker_run.push(format!("IMPERSONATE={}", &id_stdout));
docker_run.push(String::from("--entrypoint"));
docker_run.push(String::from("/usr/bin/playbook"));
}
else {
docker_run.push(String::from("-u"));
docker_run.push(impersonate.to_owned());
}
}
else {
docker_run.push(String::from("-u"));
docker_run.push(format!("{}:{}", userinfo["uid"], userinfo["gid"]));
}
if let Some(CtxObj::Str(name)) = ctx_docker.get("name") {
docker_run.push(format!("--name={}", name));
}
if let Some(CtxObj::Str(image_name)) = ctx_docker.get("image") {
docker_run.push(image_name.to_owned());
}
else {
return Err(TaskError { msg: String::from("The Docker image specification was invalid."), src: TaskErrorSource::Internal });
}
docker_run.extend::<Vec<String>>(cmd.into_iter().map(|s| {s.as_ref().to_str().unwrap().to_owned()}).collect());
let docker_cmd = crate::format_cmd(docker_run.clone());
info!("{}", &docker_cmd);
#[cfg(feature = "ci_only")]
println!("{}", &docker_cmd);
let docker_linux: Vec<CString> = docker_run.iter().map(|s| {CString::new(s as &str).unwrap()}).collect();
match fork() {
Ok(ForkResult::Child) => {
match execvp(&CString::new("docker").unwrap(), &docker_linux) {
Ok(_void) => unreachable!(),
Err(e) => Err(TaskError { msg: format!("Failed to issue the Docker command. {}", e), src: TaskErrorSource::NixError(e) }),
}
},
Ok(ForkResult::Parent { child, .. }) => {
match waitpid(child, None) {
Ok(status) => match status {
WaitStatus::Exited(_, exit_code) => {
if exit_code == 0 { Ok(docker_cmd) }
else {
Err(TaskError {
msg: format!("The container has returned a non-zero exit code ({}).", exit_code.to_string().red()),
src: TaskErrorSource::ExitCode(exit_code)
})
}
},
WaitStatus::Signaled(_, sig, _core_dump) => {
Err(TaskError {
msg: format!("The container has received a signal ({:?}).", sig),
src: TaskErrorSource::Signal(sig)
})
},
WaitStatus::Stopped(_, _sig) => unreachable!(),
WaitStatus::Continued(_) => unreachable!(),
WaitStatus::StillAlive => unreachable!(),
_ => unimplemented!()
},
Err(e) => Err(TaskError { msg: String::from("Failed to keep track of the child process."), src: TaskErrorSource::NixError(e) })
}
},
Err(e) => Err(TaskError { msg: String::from("Failed to spawn a new process."), src: TaskErrorSource::NixError(e) }),
}
}