XAR (Executable Archive)

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File Format
Name XAR (Executable Archive)
Ontology
Extension(s) .xar
Released 2018

XAR (eXecutable ARchive), or XARs, is a self-contained executable/archive file format developed by Facebook.

A XAR file can contain a program (e.g. a Python script), along with that program's dependencies, and any other required data. When executed, it mounts a Squashfs filesystem.

Identification

A XAR file apparently begins with ASCII "#!/usr/bin/env xarexec_fuse" (see shebang), or something similar.

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