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docs/composefs: Add note about toplevel dirs #3127

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Jan 2, 2024
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docs/composefs: Add note about toplevel dirs #3127

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13 changes: 13 additions & 0 deletions docs/composefs.md
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Expand Up @@ -87,6 +87,19 @@ At the current time, there are no additional userspace runtime requirements.
**IMPORTANT** The integration with composefs is experimental and subject to change. Please
try it and report issues but do not deploy to production systems yet.

## Compatiblity

One issue that ostree users transitioning to composefs may hit is that it is no
longer possible to add new toplevel directories via the `chattr -i / && mkdir /somedir && chattr -i`
trick. A bit more on this in the following issues:

* <https://github.com/coreos/rpm-ostree/issues/337>
* <https://github.com/ostreedev/ostree/pull/2681>

However, users who were doing things like this probably want to enable the
`root.transient` option; see `man ostree-prepare-root` which will allow
this (but also change other behaviors too).

## Comparison with other approaches

There is also support for using [IMA](ima.md) with ostree. In short, composefs
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