Add `--generate-master-key` CLI option

meilisearch/src/analytics/segment_analytics.rs

@@ -277,6 +277,7 @@ impl From<Opt> for Infos {
             indexer_options,
             scheduler_options,
             config_file_path,
+            generate_master_key: _,
             #[cfg(all(not(debug_assertions), feature = "analytics"))]
                 no_analytics: _,
         } = options;

meilisearch/src/main.rs

@@ -33,6 +33,10 @@ async fn main() -> anyhow::Result<()> {
 
     setup(&opt)?;
 
+    if opt.generate_master_key {
+        println!("{}", generate_master_key());
+        return Ok(());
+    }
 
     match (opt.env.as_ref(), &opt.master_key) {
         ("production", Some(master_key)) if master_key.len() < MASTER_KEY_MIN_SIZE => {
@@ -180,6 +184,7 @@ Anonymous telemetry:\t\"Enabled\""
                     "The provided Master Key is too short (< {MASTER_KEY_MIN_SIZE} characters)"
                 );
                 eprintln!("A Master Key of at least {MASTER_KEY_MIN_SIZE} characters will be required when switching to the production environment.");
+                eprintln!("Restart Meilisearch with the `--generate-master-key` flag to generate a secure Master Key you can use");
             }
         }
         ("development", None) => {

meilisearch/src/option.rs

@@ -230,6 +230,13 @@ pub struct Opt {
     #[serde(default = "default_log_level")]
     pub log_level: String,
 
+    /// Generates a string of characters that can be used as a Master Key and exits.
+    ///
+    /// Pass the generated Master Key using the `--master-key` argument or the   `MEILI_MASTER_KEY` environment variable in a subsequent Meilisearch invocation.
+    #[clap(long)]
+    #[serde(default)]
+    pub generate_master_key: bool,
+
     /// Enables Prometheus metrics and /metrics route.
     #[cfg(feature = "metrics")]
     #[clap(long, env = MEILI_ENABLE_METRICS_ROUTE)]
@@ -328,6 +335,7 @@ impl Opt {
             ignore_missing_snapshot: _,
             ignore_snapshot_if_db_exists: _,
             import_dump: _,
+            generate_master_key: _,
             ignore_missing_dump: _,
             ignore_dump_if_db_exists: _,
             config_file_path: _,