XRootD Utils

A collection of high-level utility scripts for moving data to and from offline archival storage using XRootD.

Environment setup

Other platforms may need to use different names to get the equivalent packages.

Rocky 9

sudo dnf install "@Development Tools" python3.11 python3.11-pip python3.11-setuptools python3.11-devel openldap-devel swig gcc gcc-c++ openssl-devel cmake3 libuv libuuid-devel git

Debian 12

sudo agt-get update
sudo apt-get install build-essential curl python3.11 python3.11-venv python3.11-dev python3-pip libldap2-dev libsasl2-dev cmake uuid-dev git

Usage

Authentication

XRootD uses environment variables to define the credentials used to authenticate to the server. Note that files containing keys need to be only readable/writable by the user, so it may be necessary to manually configure this:

chmod 600 /path/to/.keytab

Keytab

export XrdSecPROTOCOL=sss
export XrdSecSSSKT=/path/to/.keytab

X509 certificates

export X509_USER_CERT=/path/to/hostcert.pem
export X509_USER_KEY=/path/to/hostkey.pem

Commandline

xrootd-utils --help

usage: xrootd-utils [-h] [--verbose] url {backup,restore} ...

positional arguments:
  url               Url for remote XRootD server including top level directory path, for example root://hostname.domain:1094//path/to/directory
  {backup,restore}
    backup          Backup files in local directory to tape.
    restore         Restore files in a remote directory to tape

options:
  -h, --help        show this help message and exit
  --verbose, -v     Increase logging level to DEBUG.

Backup

xrootd-utils root://localhost:1094 backup --help

usage: xrootd-utils url backup [-h] [--auto-remove {never,backed_up,cached}] source

positional arguments:
  source                Local source path. Directories will be walked to find all nested files.

options:
  -h, --help            show this help message and exit
  --auto-remove {never,backed_up,cached}, -r {never,backed_up,cached}
                        Whether to automatically remove the local copy of a file: 'never', only when the XRootD server has it 'backed_up', or as soon as the server has a 'cached' copy.

Restore

xrootd-utils root://localhost:1094 restore --help

usage: xrootd-utils url restore [-h] [--poll-seconds POLL_SECONDS] [--auto-evict] source target

positional arguments:
  source                Remote relative source path. Directories will be walked to find all nested files.
  target                Local directory to restore relative paths to.

options:
  -h, --help            show this help message and exit
  --poll-seconds POLL_SECONDS, -s POLL_SECONDS
                        Number of seconds to wait between querying to see if requested files are online.
  --auto-evict, -e      Once copied to local storage, automatically evict the online copy cached on the remote server.

As a library

from xrootd_utils.client import Client

client = Client("root://localhost:1094//")
client.backup("local/directory")

Development

It's recommended to use poetry to manage dependencies and virtual environments, however manually managing the development environment is also possible.

python -m venv .venv
poetry install  # Note that as XRootD needs to be compiled at install time, this can take ~5 minutes
source .venv/bin/activate

Formatting

black .

Linting

flake8 xrootd_utils test

Package vulnerabilities

safety check --full-report