add possibility to start with a document

The --recover-from option allows a node start with a given document.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/config/mod.rs b/src/config/mod.rs
index b4ea0aa..24791d3 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -110,6 +110,13 @@ pub(crate) const OPTIONS: &[OptionSpec] = &[
         "Start a new swarm, as its genesis node, instead of joining one through seeds. Every start with it starts another new swarm: drop it once the swarm exists, and give the node seeds instead. With a --state-file that remembers a swarm, it starts that swarm again instead (empty; nodes of it still running merge with this one).",
     ),
     option(
+        "recover-from",
+        Kind::Text,
+        "PATH",
+        None,
+        "Start the swarm again from a backup (as GET /admin/document saves it): this node loads it, on the swarm and epoch it names, and is ready at once; other nodes join it. Members of the swarm still running merge with it, or it rejoins them if they moved on to a newer epoch (the backup is then dropped).",
+    ),
+    option(
         "state-file",
         Kind::Text,
         "PATH",
@@ -230,6 +237,7 @@ pub(crate) struct Settings {
     #[serde(default)]
     pub(crate) genesis: bool,
     pub(crate) state_file: Option<PathBuf>,
+    pub(crate) recover_from: Option<PathBuf>,
     pub(crate) swarm_key_file: Option<PathBuf>,
     pub(crate) alias: Option<String>,
     #[serde(default = "default_keepalive_secs")]
@@ -429,6 +437,8 @@ const CONFLICTS: &[(&[&str], &[&str])] = &[
     ),
     // A new swarm has nobody to join.
     (&["genesis"], &["seeds"]),
+    // Recovering starts the swarm too.
+    (&["recover-from"], &["genesis"]),
 ];
 
 /// The options `name` can't be combined with.