feat(cli): read from input stdin in validate cmd

ccv-cli/src/main.rs

@@ -1,7 +1,12 @@
 use ccv_core::{schema::ConfigKind, validator::Validator};
 use clap::builder::TypedValueParser as _;
 use clap::Parser;
-use std::{fs, path::Path, path::PathBuf, process};
+use std::{
+    fs,
+    io::{self, Read},
+    path::{Path, PathBuf},
+    process,
+};
 
 #[derive(Parser)]
 #[command(name = "ccv", author, version, about, long_about = None)]
@@ -28,7 +33,9 @@ async fn main() -> process::ExitCode {
     let CCVCli::Validate(args) = CCVCli::parse();
 
     let payload = if Path::new("-") == args.file {
-        todo!("read stdin");
+        let mut buffer = Vec::new();
+        io::stdin().read_to_end(&mut buffer).unwrap();
+        String::from_utf8(buffer).unwrap()
     } else {
         let f = args.file;
         match fs::read_to_string(&f) {

ccv-cli/tests/cli.rs

@@ -1,7 +1,7 @@
 use assert_cmd::prelude::*;
+use assert_cmd::Command;
 use assert_fs::prelude::*;
 use predicates::prelude::*;
-use std::process::Command;
 
 #[test]
 fn file_doesnt_exist() -> Result<(), Box<dyn std::error::Error>> {
@@ -61,3 +61,40 @@ network:
 
     Ok(())
 }
+
+#[test]
+fn valid_network_config_stdin() -> Result<(), Box<dyn std::error::Error>> {
+    let content = r#"
+network:
+  version: 1
+  config:
+    - type: bond
+      name: a
+      mac_address: aa:bb
+      mtu: 1
+      subnets:
+        - type: dhcp6
+          control: manual
+          netmask: 255.255.255.0
+          gateway: 10.0.0.1
+          dns_nameservers:
+            - 8.8.8.8
+          dns_search:
+            - find.me
+          routes:
+            - type: route
+              destination: 10.20.0.0/8
+              gateway: a.b.c.d
+              metric: 200"#;
+
+    let mut cmd = Command::cargo_bin("ccv-cli")?;
+    cmd.arg("validate")
+        .args(["--kind", "networkconfig"])
+        .args(["-"]);
+    cmd.write_stdin(content);
+    cmd.assert().success().stdout(predicate::str::contains(
+        r#"{"annotations":[],"errors":[],"is_valid":true}"#,
+    ));
+
+    Ok(())
+}