add force module usable by API and CLI

1 files changed, 14 insertions, 0 deletions

diff --git a/src/config/mod.rs b/src/config/mod.rs
index 0771e7e..c83ca70 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -65,6 +65,9 @@ const fn option(
     }
 }
 
+/// What `--force` may override at start (`force`).
+pub(crate) const FORCE: &[&str] = &["swarmId"];
+
 /// Every option. Names are the long option names and the configuration file keys.
 pub(crate) const OPTIONS: &[OptionSpec] = &[
     option(
@@ -110,6 +113,13 @@ 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. Can't be combined with seeds. 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(
+        "force",
+        Kind::List,
+        "NAME,[NAME...]",
+        None,
+        "Override checks that otherwise refuse to start: true for all, or names: swarmId (a backup of another swarm than the state file remembers).",
+    ),
+    option(
         "recover-from",
         Kind::Text,
         "PATH",
@@ -238,6 +248,8 @@ pub(crate) struct Settings {
     pub(crate) genesis: bool,
     pub(crate) state_file: Option<PathBuf>,
     pub(crate) recover_from: Option<PathBuf>,
+    #[serde(default)]
+    pub(crate) force: Vec<String>,
     pub(crate) swarm_key_file: Option<PathBuf>,
     pub(crate) alias: Option<String>,
     #[serde(default = "default_keepalive_secs")]
@@ -311,6 +323,8 @@ impl Settings {
                 );
             }
         }
+        crate::force::Force::parse(self.force.iter().map(String::as_str), FORCE)
+            .map_err(|reason| anyhow!("force: {reason}"))?;
         // Contradictions, not overrides: an error wherever the options come from.
         if self.genesis && !self.seeds.is_empty() {
             bail!(