Print environment note for json format, too.

Author: ehuss

src/cargo/ops/cargo_config.rs

@@ -1,8 +1,8 @@
 //! Implementation of `cargo config` subcommand.
 
-use crate::drop_println;
 use crate::util::config::{Config, ConfigKey, ConfigValue as CV, Definition};
 use crate::util::errors::CargoResult;
+use crate::{drop_eprintln, drop_println};
 use anyhow::{bail, format_err, Error};
 use serde_json::json;
 use std::borrow::Cow;
@@ -68,15 +68,16 @@ pub fn get(config: &Config, opts: &GetOptions<'_>) -> CargoResult<()> {
             .get_cv_with_env(&key)?
             .ok_or_else(|| format_err!("config value `{}` is not set", key))?;
         match opts.format {
-            ConfigFormat::Toml => {
-                print_toml(config, opts, &key, &cv);
-                if let Some(env) = maybe_env(config, &key, &cv) {
-                    print_toml_env(config, &env);
-                }
-            }
+            ConfigFormat::Toml => print_toml(config, opts, &key, &cv),
             ConfigFormat::Json => print_json(config, &key, &cv, true),
             ConfigFormat::JsonValue => print_json(config, &key, &cv, false),
         }
+        if let Some(env) = maybe_env(config, &key, &cv) {
+            match opts.format {
+                ConfigFormat::Toml => print_toml_env(config, &env),
+                ConfigFormat::Json | ConfigFormat::JsonValue => print_json_env(config, &env),
+            }
+        }
     } else {
         match &opts.format {
             ConfigFormat::Toml => print_toml_unmerged(config, opts, &key)?,
@@ -168,6 +169,17 @@ fn print_toml_env(config: &Config, env: &[(&String, &String)]) {
     }
 }
 
+fn print_json_env(config: &Config, env: &[(&String, &String)]) {
+    drop_eprintln!(
+        config,
+        "note: The following environment variables may affect the loaded values."
+    );
+    for (env_key, env_value) in env {
+        let val = shell_escape::escape(Cow::Borrowed(env_value));
+        drop_eprintln!(config, "{}={}", env_key, val);
+    }
+}
+
 fn print_json(config: &Config, key: &ConfigKey, cv: &CV, include_key: bool) {
     let json_value = if key.is_root() || !include_key {
         cv_to_json(cv)

tests/testsuite/cargo_config.rs

@@ -200,15 +200,27 @@ fn get_json() {
         .env("CARGO_ALIAS_BAR", "cat dog")
         .env("CARGO_BUILD_JOBS", "100")
         .with_json(all_json)
-        .with_stderr("")
+        .with_stderr(
+            "\
+note: The following environment variables may affect the loaded values.
+CARGO_ALIAS_BAR=[..]cat dog[..]
+CARGO_BUILD_JOBS=100
+CARGO_HOME=[ROOT]/home/.cargo
+",
+        )
         .run();
 
     // json-value is the same for the entire root table
     cargo_process("config get --format=json-value -Zunstable-options")
         .cwd(&sub_folder.parent().unwrap())
         .masquerade_as_nightly_cargo()
         .with_json(all_json)
-        .with_stderr("")
+        .with_stderr(
+            "\
+note: The following environment variables may affect the loaded values.
+CARGO_HOME=[ROOT]/home/.cargo
+",
+        )
         .run();
 
     cargo_process("config get --format=json build.jobs -Zunstable-options")