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feature(subroot-jails): add a few features enabling easy use of subroot jails #78

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Merged
kaniini merged 1 commit into from
Feb 13, 2026
Merged

feature(subroot-jails): add a few features enabling easy use of subroot jails #78

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22 changes: 18 additions & 4 deletions bin/styrojail.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,14 @@ struct Cli {
#[arg(long)]
no_default_mounts: bool,

/// Path to rootfs (default: /)
#[arg(long, default_value = "/")]
rootfs: String,

/// Whether the rootfs should be readonly (default: true)
#[arg(long)]
no_rootfs_readonly: bool,

/// Additional bind-mounts for the jail
#[arg(long, value_name = "HOSTPATH:JAILPATH", value_parser = parse_mount)]
mount: Vec<CliMountSpec>,
Expand Down Expand Up @@ -148,16 +156,15 @@ fn to_styrolite_mount(m: &CliMountSpec) -> StyroMountSpec {
fn main() -> Result<()> {
let (uid, gid) = current_ids();

let cli = Cli::parse();
let mut cli = Cli::parse();
let mut builder = CreateRequestBuilder::new()
.set_rootfs("/")
.set_rootfs_readonly(true)
.set_rootfs(&cli.rootfs)
.set_rootfs_readonly(!cli.no_rootfs_readonly)
.set_skip_two_stage_userns(true)
.set_executable(&cli.program)
.set_uid(uid)
.set_gid(gid)
.set_setgroups_deny(true)
.set_working_directory(std::env::current_dir()?.as_os_str().to_str().unwrap_or("/"))
.set_workload_id(format!("styrojail-{}", std::process::id()).as_str())
.push_uid_mapping(IdMapping {
base_nsid: uid,
Expand All @@ -176,6 +183,13 @@ fn main() -> Result<()> {
.push_namespace(Namespace::Ipc)
.push_namespace(Namespace::Mount);

if cli.rootfs == "/" {
builder = builder
.set_working_directory(std::env::current_dir()?.as_os_str().to_str().unwrap_or("/"))
} else {
cli.no_default_mounts = true;
}

let args_ref: Vec<&str> = cli.args.iter().map(|s| s.as_str()).collect();
builder = builder.set_arguments(args_ref);

Expand Down
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