Setup Sandbox Compiles

There are a little difference between development and production environment, if you want to setup sandbox compile for dev. There are 3 things you need to mind:

• File Permission Problem

• Volume Share Between history-v1 and filestore

• Subdirectories Problem

Enable Sandbox Compiles

Here, we just need to enable Sandbox Compiles like what we do in overleaf ce. However, we only need to mind the user. Here we set it to root.

In production environment, we use www-data as a shared user between overleaf container and tex compile container. However, in dev env, node is the default user in container. And there's no www-data user to hook this. So we just use root as a workaround.

Please don't use your self-built image, you may encounter a series of errors.

#################
#   Sandbox     #
#################
SANDBOXED_COMPILES=true
TEXLIVE_IMAGE_USER=root
ALL_TEX_LIVE_DOCKER_IMAGES=ghcr.io/ayaka-notes/texlive-full:2025.1, ghcr.io/ayaka-notes/texlive-full:2024.1
ALL_TEX_LIVE_DOCKER_IMAGE_NAMES=Texlive 2025, Texlive 2024
TEX_LIVE_DOCKER_IMAGE=ghcr.io/ayaka-notes/texlive-full:2025.1

Fix File Permissions

LaTeX runs in the sibling containers as the user specified in the TEXLIVE_IMAGE_USER environment variable. In the example above this is set to root, which has uid 0. This creates a problem with the above permissions, as the root user does not have permission to write to subfolders of compiles.

A quick fix is to give the root group ownership and read write permissions to compiles, with setgid set so that new subfolders also inherit this ownership:

bash

sudo chown -R 1000:root compiles
sudo chmod -R g+w compiles
sudo chmod g+s compiles

For detailed document, you can see services/clsi/README.md.

Volume Share Between history-v1 and filestore

By default, filestore act as a bridge between s3 and other services in overleaf. However, in overleaf ce or server pro, all files are stored locally by default. So, overleaf introduced a very tricky method.

server-ce/config/settings.js

switch (process.env.OVERLEAF_FILESTORE_BACKEND) {
  case 's3':
    // s3 case...
  default:
    settings.filestore = {
      backend: 'fs',
      stores: {
        template_files: Path.join(DATA_DIR, 'template_files'),

        // NOTE: The below paths are hard-coded in server-ce/config/production.json, so hard code them here as well.
        // We can use DATA_DIR after switching history-v1 from 'config' to '@overleaf/settings'.
        project_blobs:
          process.env.OVERLEAF_HISTORY_PROJECT_BLOBS_BUCKET ||
          '/var/lib/overleaf/data/history/overleaf-project-blobs',
        global_blobs:
          process.env.OVERLEAF_HISTORY_BLOBS_BUCKET ||
          '/var/lib/overleaf/data/history/overleaf-global-blobs',
      },
    }
}

And in the meantime, data/history is also used by history service. In this way, they can share the same data between different micro service. You need to add this volume history-v1-buckets to your filestore service in develop. Otherwise, clsi will not be able to pull blob files from filestore service.

develop/docker-compose.yml

  filestore:
    build:
      context: ..
      dockerfile: services/filestore/Dockerfile
    env_file:
      - dev.env
#    environment:
#      - ENABLE_CONVERSIONS=true
    volumes:
      - filestore-public-files:/overleaf/services/filestore/public_files
      - filestore-template-files:/overleaf/services/filestore/template_files
      - filestore-uploads:/overleaf/services/filestore/uploads
      - history-v1-buckets:/buckets

Also you need to add BUCKET name to dev.env settings:

develop/dev.env

OVERLEAF_EDITOR_PROJECT_BLOBS_BUCKET='/buckets/project_blobs'
OVERLEAF_EDITOR_BLOBS_BUCKET='/buckets/blobs'

Use Subdirectories

Filestore use useSubdirectories as true by default, however, in development, history v1 will flatten all the data. This cause some conflict. To fix this, you need add the following:

develop/dev.env

OVERLEAF_EDITOR_PROJECT_BLOBS_BUCKET='/buckets/project_blobs'
OVERLEAF_EDITOR_BLOBS_BUCKET='/buckets/blobs'
NODE_CONFIG='{"persistor":{"useSubdirectories":true}}'

In history v1, all project_blobs files are stored like this originally:

node@43eb5dac5b1b:/buckets/project_blobs$ ls
169_609_71360f687c431b9796_5b_889ef3cf71c83a4c027c4e4dc3d1a106b27809  
94e_655_88cb5cc77ab70c9796_a0_e21c740cf81e868f158e30e88985b5ea1d6c19
169_609_71360f687c431b9796_a0_e21c740cf81e868f158e30e88985b5ea1d6c19
94e_655_88cb5cc77ab70c9796_fd_3c0326302e49486d3ea86c833edf9b88320c41
169_609_71360f687c431b9796_fd_3c0326302e49486d3ea86c833edf9b88320c41 

You need to set useSubdirectories to true to change it use subdir mode. Now, orignal _ in blob will be substitute as / .