Add an 'spk config' command

crates/spk-cli/group4/Cargo.toml

@@ -27,6 +27,7 @@ itertools = { workspace = true }
 spfs = { workspace = true }
 spk-cli-common = { workspace = true }
 spk-cli-group2 = { workspace = true }
+spk-config = { workspace = true }
 spk-schema = { workspace = true }
 spk-solve = { workspace = true }
 spk-storage = { workspace = true }

crates/spk-cli/group4/src/cmd_config.rs

@@ -0,0 +1,30 @@
+// Copyright (c) Contributors to the SPK project.
+// SPDX-License-Identifier: Apache-2.0
+// https://github.com/spkenv/spk
+
+use clap::Args;
+use miette::{IntoDiagnostic, Result};
+use spk_cli_common::{CommandArgs, Run};
+
+/// Output the current configuration of spk
+#[derive(Args)]
+pub struct Config {}
+
+#[async_trait::async_trait]
+impl Run for Config {
+    type Output = i32;
+
+    async fn run(&mut self) -> Result<Self::Output> {
+        let config = spk_config::get_config()?;
+        let out = serde_json::to_string_pretty(&*config).into_diagnostic()?;
+        println!("{out}");
+        Ok(0)
+    }
+}
+
+impl CommandArgs for Config {
+    fn get_positional_args(&self) -> Vec<String> {
+        // There are no important positional args for a config command
+        vec![]
+    }
+}

crates/spk-cli/group4/src/lib.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // https://github.com/spkenv/spk
 
+pub mod cmd_config;
 pub mod cmd_lint;
 pub mod cmd_search;
 pub mod cmd_version;

crates/spk/src/cli.rs

@@ -15,7 +15,7 @@ use spk_cli_common::{CommandArgs, Error, Run, configure_logging};
 use spk_cli_group1::{cmd_bake, cmd_completion, cmd_deprecate, cmd_undeprecate};
 use spk_cli_group2::{cmd_ls, cmd_new, cmd_num_variants, cmd_publish, cmd_remove, cmd_stats};
 use spk_cli_group3::{cmd_export, cmd_import};
-use spk_cli_group4::{cmd_lint, cmd_search, cmd_version, cmd_view};
+use spk_cli_group4::{cmd_config, cmd_lint, cmd_search, cmd_version, cmd_view};
 use spk_cmd_build::cmd_build;
 use spk_cmd_convert::cmd_convert;
 use spk_cmd_debug::cmd_debug;
@@ -160,6 +160,7 @@ pub enum Command {
     Bake(cmd_bake::Bake),
     Build(cmd_build::Build),
     Completion(cmd_completion::Completion),
+    Config(cmd_config::Config),
     Convert(cmd_convert::Convert),
     Debug(cmd_debug::Debug),
     Deprecate(cmd_deprecate::DeprecateCmd),
@@ -201,6 +202,7 @@ impl Run for Command {
             Command::Bake(cmd) => cmd.run().await,
             Command::Build(cmd) => cmd.run().await.map(Into::into),
             Command::Completion(cmd) => cmd.run(Opt::command()),
+            Command::Config(cmd) => cmd.run().await,
             Command::Convert(cmd) => cmd.run().await,
             Command::Debug(cmd) => cmd.run().await,
             Command::Deprecate(cmd) => cmd.run().await,
@@ -238,6 +240,7 @@ impl CommandArgs for Command {
             Command::Build(cmd) => cmd.get_positional_args(),
             Command::Convert(cmd) => cmd.get_positional_args(),
             Command::Completion(cmd) => cmd.get_positional_args(),
+            Command::Config(cmd) => cmd.get_positional_args(),
             Command::Debug(cmd) => cmd.get_positional_args(),
             Command::Deprecate(cmd) => cmd.get_positional_args(),
             Command::Du(cmd) => cmd.get_positional_args(),

docs/admin/config.md

@@ -15,6 +15,11 @@ For spk: `/etc/spk.toml`, which can be overridden by `~/.config/spk/spk.toml`
 
 All spfs and spk configuration values can be overridden in the environment. The name of the variable will be the upper-cased name of the config value, separated by underscores, and prefixed with either `SPFS_` or `SPK_`, eg: `SPFS_STORAGE_ROOT`. In cases where the name of the config value contains an underscore, two underscores can be used to disambiguate separators from names, eg: `SPFS_STORAGE__TAG_NAMESPACE`.
 
+### Viewing the Current Configuration
+
+The effective configuration, after all files and environment variables have been
+loaded, can be printed as json with the `spfs config` and `spk config` commands.
+
 ### SPFS Configuration
 
 ```toml