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doc: mention that choosing root/usr partitions by strverscmp() on the partition label is OK

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Lennart Poettering 2021-03-11 21:35:24 +01:00
parent 1474d7ac2d
commit df27f1dbca
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9
docs/DISCOVERABLE_PARTITIONS.md
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@ -162,7 +162,14 @@ partition is listed in `/etc/fstab` or with `root=` on the kernel command line,
it _must_ take precedence over automatically discovered partitions. If a
`/home/`, `/usr/`, `/srv/`, `/boot/`, `/var/`, `/var/tmp/`, `/efi/` or `/boot/`
directory is found to be populated already in the root partition, the automatic
discovery _must not_ mount any discovered file system over it.
discovery _must not_ mount any discovered file system over it. Optionally, in
case of the root, `/usr/` and their Verity partitions instead of strictly
mounting the first suitable partition an OS might choose to mount the partition
whose label compares the highest according to `strverscmp()` or a similar
logic, in order to implement a simple partition-based A/B versioning
scheme. The precise rules are left for the implementation to decide, but when
in doubt earlier partitions (by their index) should always win over later
partitions if the label comparison is inconclusive.
A *container* *manager* should automatically discover and mount the root,
`/usr/`, `/home/`, `/srv/`, `/var/`, `/var/tmp/` partitions inside a container