ostree - 2020.8-2+deb11u1 main

libostree provides a library and tools for managing bootable, immutable,
versioned filesystem trees. It is like git in that it checksums
individual files and has a content-addressed object store; unlike git,
it "checks out" the files using hardlinks into an immutable directory
tree. This can be used to provide atomic upgrades with rollback, history
and parallel-installation, particularly useful on "fixed purpose"
systems such as embedded devices.
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This package contains the executables used to manage and create
filesystem trees. It does not affect the boot process for the system
on which it is installed.