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use nix::mount::{self, MsFlags};
use common::error::*;
use crate::{paths, util::fs};
fn prepare_dev(path: &str) -> Result<()> {
fs::mkdir(path)?;
mount::mount::<_, _, str, str>(Some(path), path, None, MsFlags::MS_BIND, None)
.context("Failed to bind mount container /dev")?;
for dir in ["pts", "shm"] {
fs::mkdir(paths::join(&[path, dir]))?;
}
for (link, target) in [
("fd", "/proc/self/fd"),
("stdin", "/proc/self/fd/0"),
("stdout", "/proc/self/fd/1"),
("stderr", "/proc/self/fd/2"),
("ptmx", "pts/ptmx"),
] {
let path = paths::join(&[path, link]);
std::os::unix::fs::symlink(target, &path)
.with_context(|| format!("Failed to create link {}", path))?;
}
for dev in ["null", "zero", "full", "random", "urandom", "tty"] {
let source = paths::join(&["/dev", dev]);
let target = paths::join(&[path, dev]);
fs::create(&target)?;
mount::mount::<str, str, str, str>(Some(&source), &target, None, MsFlags::MS_BIND, None)
.with_context(|| format!("Failed to bind mount {}", source))?;
}
mount::mount::<str, _, str, str>(
None,
path,
None,
MsFlags::MS_REMOUNT | MsFlags::MS_BIND | MsFlags::MS_RDONLY,
None,
)
.context("Failed to mount container /dev read-only")?;
Ok(())
}
pub fn init_runner() -> Result<()> {
fs::mkdir(paths::LAYER_STATE_DIR)?;
fs::mkdir(paths::OUTPUT_STATE_DIR)?;
fs::ensure_removed(paths::TMP_DIR)?;
fs::mkdir(paths::TMP_DIR)?;
mount::mount::<_, _, str, str>(
Some(paths::TMP_DIR),
paths::TMP_DIR,
None,
MsFlags::MS_BIND,
None,
)
.context("Failed to bind mount build tmpdir")?;
mount::mount::<str, _, str, str>(None, paths::TMP_DIR, None, MsFlags::MS_PRIVATE, None)
.context("Failed to set MS_PRIVATE for build tmpdir")?;
prepare_dev(paths::DEV_DIR)?;
Ok(())
}
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