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Review 4, R2 partly (F8): a joining node waited for "each of its seeds" to name the
swarm's root as a count, of every admitted peer that named one. Node identities are
self-made and admission is the swarm key: a member answering a joiner under as many
identities as it has seeds, naming its own root within the wait, made the joiner pin
it before the real seeds answered, and refuse them after as another history.
Now the seeds are the nodes proven at the seeds' addresses (`roots::seed_found`, as
`bootstrap::resolve_seeds` finds them), and only their roots count toward the wait
and start its clock. Another peer naming a root still disputes it (no root while they
differ), so such a member can keep a joiner from joining, as any member can, but not
hand it another root. access.md says so.
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Review 3, R2: the root pin was set by the first HELLO_REPLY, and the
first sync, a round trip later, took that root; a peer naming another
afterwards was refused as another history. So the seed that answered
first decided, not "none while they disagree", and a malicious seed
makes itself fastest.
A node joining with an empty document of the first epoch now takes no
root (RootPin::Awaiting, roots left for later) until each of its seeds
named one, or ROOT_WAIT (10 s) passed since the first did; then the
one they name, none while they differ, as before. With --genesis-root
it takes that one alone, at once. access.md, the option's help and
example.toml say so; switching roots later, while the joiner holds
nothing of its own, is postponed.
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Review 2, N7, the care it raised: a joining node's empty document took
as the first epoch's root whatever dependency-less change came first,
from whichever peer it joined through; the first epoch's ID is all
zeros, so nothing pinned it. A remake's epoch has its ID, the snapshot
change's hash, which the rules hold its root to.
* Every node names its epoch's root in HELLO and HELLO_REPLY (the
epoch's ID for a remake's, its genesis change for the first; wire
version 45). A node whose document starts from another root of the
same epoch refuses the handshake, logging it: another history under
the swarm's ID, a forged root or a genesis started again.
* A joining node with an empty document takes as its root only the one
it was given (--genesis-root, new), else the one its peers name, and
none while they name different ones (access::screen::RootPin, kept
in Screening across documents): one peer hands it another root only
if it is all the joiner hears, or never, with --genesis-root. A root
refused is listed with the refused, what builds on it with it.
* The genesis node logs the root (`The swarm's root`); GET
/admin/epochs shows it (`root`).
A genesis started again under a remembered swarm ID used to merge with
the nodes of it still running; they now refuse it (another root), and
the docs say to join them with seeds instead.
The epoch's identity stays as it is (generation 0 all zeros): records
and epoch metadata name it so, and every comparison of epochs with
them.
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The first users' SSH keys, recorded at genesis with their entries, so a
swarm can be strict from its start.
Auth plan M7.
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A node's signatures are saved with its document (--document-file) and
loaded with it.
Auth plan M5.
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/admin/users: list, add (one or several), remove, disable, grant and
revoke capabilities; each one change, refused if it would lock its
writer out. Capabilities as the store's paths name them.
Auth plan M1.
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--bootstrap-users gives a new swarm a registry from its first change,
each first user with everything; other users may do nothing until
added. Without it the swarm has no registry and works as before.
Auth plan M1.
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This allows a lot of operations to drop mut.
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The --recover-from option allows a node start with a given document.
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This allows storing the swarm ID and additionally discovered seeds,
which prevents a formerly genesis node to start a new document.
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The --genesis flag has been introduced to start with a new document.
This prevents restarts to accidentally start with a new document and
accept reads/writes, causing a second swarm to appear.
Additionally, bootstrapping doesn't timeout anymore as that's of no use
for nobody.
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The handshake resets the session anyway, and the sender's reply timeout
resends what still matters.
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