Files
windmill/backend/windmill-worker/nsjail/run.java.config.proto
T
Ruben FiszelandClaude Opus 4.7 9111f8908d feat(nsjail): make tmpfs size configurable via instance setting (#9261)
* feat(nsjail): make tmpfs size configurable via instance setting

Adds a new `nsjail_tmpfs_size_mb` instance setting that overrides the
size of the `/tmp` tmpfs mount inside the nsjail sandbox across all
languages. When unset, the existing per-language defaults (500MB or
800MB) continue to apply, so no behavior change for existing
deployments.

The setting is exposed under Settings → Jobs and is read at job
execution time, so changes take effect on the next job without a
restart.

Fixes WIN-1963

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* refactor(nsjail): unify default tmpfs size to 800MB

Previously each executor passed its own per-language default (500MB or
800MB) to resolve_nsjail_tmpfs_size. Unify on a single
DEFAULT_NSJAIL_TMPFS_SIZE_BYTES constant (800MB) so the placeholder
behavior is consistent across languages.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(nsjail): resolve tmpfs size outside ruby download closure

The download.ruby config render runs inside a sync closure passed to
par_install_language_dependencies_seq, so `.await` on
resolve_nsjail_tmpfs_size() was a compile error under the `ruby`
feature. Resolve the size once before the closure and capture the
string instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(nsjail): rename resolver to *_bytes and clarify fallback

Addresses CI review feedback:
- Rename `resolve_nsjail_tmpfs_size` to `resolve_nsjail_tmpfs_size_bytes`
  so the returned unit is unambiguous at the call site (cubic P2).
- Fix the `NSJAIL_TMPFS_SIZE_MB` doc comment that still said "per-language
  default" — there is no per-language fallback anymore, all unset
  values resolve to the unified 800MB `DEFAULT_NSJAIL_TMPFS_SIZE_BYTES`
  (codex/pi P2).
- Expand the resolver doc to call out that `Some(0)` and negative values
  also fall back, since the match arm is `Some(mb) if mb > 0`.

No behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-20 13:24:49 +00:00

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name: "java run script"
mode: ONCE
hostname: "java"
log_level: ERROR
time_limit: {TIMEOUT}
disable_rl: true
cwd: "/tmp"
clone_newnet: false
clone_newuser: {CLONE_NEWUSER}
skip_setsid: true
keep_caps: false
keep_env: true
mount_proc: true
mount {
src: "/bin"
dst: "/bin"
is_bind: true
}
mount {
src: "/lib"
dst: "/lib"
is_bind: true
}
mount {
src: "/lib64"
dst: "/lib64"
is_bind: true
mandatory: false
}
mount {
src: "/usr"
dst: "/usr"
is_bind: true
}
mount {
src: "/dev/null"
dst: "/dev/null"
is_bind: true
rw: true
}
mount {
dst: "/tmp"
fstype: "tmpfs"
rw: true
options: "size={NSJAIL_TMPFS_SIZE}"
}
mount {
src: "{JOB_DIR}/target"
dst: "/tmp/target"
is_bind: true
mandatory: false
}
mount {
src: "{JOB_DIR}/args.json"
dst: "/tmp/args.json"
is_bind: true
}
mount {
src: "{JOB_DIR}/result.json"
dst: "/tmp/result.json"
rw: true
is_bind: true
}
mount {
src: "{CACHE_DIR}"
dst: "{CACHE_DIR}"
is_bind: true
mandatory: false
}
mount {
src: "/etc"
dst: "/etc"
is_bind: true
}
# Container runtimes bind exactly these 3 files as separate submounts over
# /etc; nsjail's ro remount of /etc is non-recursive so they stay writable.
# Load-bearing -- do not remove as redundant with the /etc bind above.
mount {
src: "/etc/resolv.conf"
dst: "/etc/resolv.conf"
is_bind: true
mandatory: false
}
mount {
src: "/etc/hosts"
dst: "/etc/hosts"
is_bind: true
mandatory: false
}
mount {
src: "/etc/hostname"
dst: "/etc/hostname"
is_bind: true
mandatory: false
}
mount {
src: "/dev/random"
dst: "/dev/random"
is_bind: true
}
mount {
src: "/dev/urandom"
dst: "/dev/urandom"
is_bind: true
}
iface_no_lo: true
{SHARED_MOUNT}