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docs/composefs: Add note about toplevel dirs

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Just thinking about trying to land this, I think some people
may hit this one.
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Colin Walters 2024-01-02 15:16:47 -05:00
parent 888f29a62a
commit 712eecad4f
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docs/composefs.md
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@ -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