feat: add sub-command "config"

Sponsored-by: author

4 files changed, 29 insertions, 2 deletions

diff --git a/src/bin/vmadm.rs b/src/bin/vmadm.rs
index 711bc98..897b145 100644
--- a/src/bin/vmadm.rs
+++ b/src/bin/vmadm.rs
@@ -27,6 +27,11 @@ enum Command {
         spec: PathBuf,
     },
 
+    Config {
+        #[structopt(flatten)]
+        common: CommonOptions,
+    },
+
     List {
         #[structopt(flatten)]
         common: CommonOptions,
@@ -85,6 +90,11 @@ fn main() -> anyhow::Result<()> {
             cmd::new(&specs)?;
         }
 
+        Command::Config { common } => {
+            let config = config(&common)?;
+            cmd::config(&config)?;
+        }
+
         Command::List { common } => {
             let config = config(&common)?;
             cmd::list(&config)?;
diff --git a/src/cmd/config.rs b/src/cmd/config.rs
new file mode 100644
index 0000000..996439b
--- /dev/null
+++ b/src/cmd/config.rs
@@ -0,0 +1,14 @@
+//! The `config` sub-command.
+
+use std::io::Write;
+
+use crate::config::Configuration;
+
+/// The `config` sub-command.
+///
+/// Write the actual run-time configuration to stdout.
+pub fn config(config: &Configuration) -> Result<(), std::io::Error> {
+    let config = serde_yaml::to_vec(&config).unwrap();
+    std::io::stdout().write_all(&config)?;
+    Ok(())
+}
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index 8ae8f70..490cdc4 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -20,3 +20,6 @@ pub use shutdown::shutdown;
 
 pub mod cloud_init;
 pub use cloud_init::cloud_init;
+
+pub mod config;
+pub use config::config;
diff --git a/src/config.rs b/src/config.rs
index 3f1b341..0ff251a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -2,13 +2,13 @@
 
 use crate::util::{expand_optional_pathbuf, expand_optional_pathbufs};
 use log::debug;
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use std::default::Default;
 use std::fs;
 use std::path::{Path, PathBuf};
 
 /// Configuration from configuration file.
-#[derive(Default, Debug, Deserialize)]
+#[derive(Default, Debug, Deserialize, Serialize)]
 pub struct Configuration {
     /// Base image, if provided.
     pub default_base_image: Option<PathBuf>,