tests: add scenario for querying the full configuration

Sponsored-by: author

13 files changed, 2075 insertions, 5 deletions

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f5acb35
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1728 @@
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diff --git a/Cargo.toml b/Cargo.toml
index f6a13ea..8bab92f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,16 @@ name = "ambient-run"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
+clap = { version = "4.3.19", features = ["derive"] }
+directories-next = "2.0.0"
+serde = { version = "1.0.182", features = ["derive"] }
+serde_yaml = "0.9.25"
+subplotlib = "0.8.0"
+thiserror = "1.0.44"
+
+[build-dependencies]
+subplot-build = "0.8.0"
+
+[dev-dependencies]
+fehler = "1.0.0"
diff --git a/ambient-run.md b/ambient-run.md
index bcf9514..6ea76c4 100644
--- a/ambient-run.md
+++ b/ambient-run.md
@@ -41,9 +41,98 @@ FIXME: This chapter will enumerate all requirements for `ambient-run`,
 as acceptance criteria, using Subplot scenarios to document how to
 verify the software meets the requirements.
 
+## Stakeholders
+
+The following people are explicitly named stakeholders for
+`ambient-run`:
+
+* Lars Wirzenius
+
+Additional stakeholders will be added as they're discovered. They may
+be specific people, or descriptions of groups.
+
 ## Configuration handling
 
+### Show default per-user configuration file path name
+
+_Requirement:_ `ambient-run` can tell the user the path name of the
+default configuration file.
+
+_Justification:_ As a user I want to be sure where the default
+configuration file should be, whether it currently exists or not.
+
+_Stakeholder:_ Lars.
+
+~~~scenario
+given an installed ambient-run
+
+when I run ambient-run config --default --filename
+then stdout matches regex ^/
+then stdout contains "/.config/ambient-run/config.yaml"
+~~~
+
+### List configuration file paths
+
+_Requirement:_ `ambient-run` can list the path name of the
+configuration file it read.
+
+_Justification:_ As a user I want to know what configuration files are
+actually used.
+
+_Stakeholder:_ Lars.
+
+Note that we want to know only the names of files that are actually
+used, not files that will be used if they exist.
+
+~~~scenario
+given an installed ambient-run
+
+when I run ambient-run config --filename
+then stdout is exactly ""
+
+given file .config/ambient-run/config.yaml from default.yaml
+when I run ambient-run config --filename
+then stdout matches regex ^/
+then stdout contains "/.config/ambient-run/config.yaml"
+then stdout doesn't contain "extra.yaml"
+
+given file extra.yaml
+when I run ambient-run --config extra.yaml config --filename
+then stdout contains "/.config/ambient-run/config.yaml"
+then stdout contains "/extra.yaml"
+~~~
+
 ### Show per-user configuration
+
+_Requirement:_ One can query `ambient-run` for its full per-user
+configuration. This means the union of the built-in default
+configuration, any configuration files, and command line arguments.
+
+_Justification:_ As a user I want to see the actual configuration
+without having to deduce it myself.
+
+_Stakeholder:_ Lars
+
+~~~scenario
+given an installed ambient-run
+given file .config/ambient-run/config.yaml from default.yaml
+given file extra.yaml
+when I run ambient-run --config extra.yaml config
+then stdout, as YAML, matches file full-config.yaml
+~~~
+
+~~~{#default.yaml .file .yaml}
+max_cpus: 4
+~~~
+
+~~~{#extra.yaml .file .yaml}
+max_cpus: 8
+~~~
+
+~~~{#full-config.yaml .file .yaml}
+max_cpus: 8
+~~~
+
 ### Show per-project configuration
 ### Show per-build configuration
 
diff --git a/ambient-run.subplot b/ambient-run.subplot
index 8bf4a66..ec51239 100644
--- a/ambient-run.subplot
+++ b/ambient-run.subplot
@@ -3,3 +3,10 @@ authors:
   - Lars Wirzenius
 markdowns:
   - ambient-run.md
+bindings:
+  - subplot/ambient-run.yaml
+  - lib/files.yaml
+  - lib/runcmd.yaml
+impls:
+  rust:
+    - subplot/ambient-run.rs
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..2effc57
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    subplot_build::codegen("ambient-run.subplot").expect("failed to generate code with Subplot");
+}
diff --git a/src/bin/ambient-run.rs b/src/bin/ambient-run.rs
new file mode 100644
index 0000000..d800630
--- /dev/null
+++ b/src/bin/ambient-run.rs
@@ -0,0 +1,82 @@
+use ambient_run::{
+    config::{canonical, default_config_file, Config},
+    error::AmbientRunError,
+};
+use clap::Parser;
+use std::{
+    error::Error,
+    path::{Path, PathBuf},
+};
+
+fn main() {
+    if let Err(e) = fallible_main() {
+        eprintln!("ERROR: {}", e);
+        let mut e = e.source();
+        while let Some(underlying) = e {
+            eprintln!("  caused by: {}", underlying);
+            e = underlying.source();
+        }
+    }
+}
+
+fn fallible_main() -> Result<(), AmbientRunError> {
+    let args = Args::parse();
+    match &args.cmd {
+        Command::Config(x) => x.run(&args),
+    }
+}
+
+#[derive(Debug, Parser)]
+struct Args {
+    /// Configuration file to read. This can be used multiple times.
+    #[clap(long)]
+    config: Vec<PathBuf>,
+
+    #[clap(subcommand)]
+    cmd: Command,
+}
+
+#[derive(Debug, Parser)]
+enum Command {
+    Config(ConfigCommand),
+}
+
+#[derive(Debug, Parser)]
+struct ConfigCommand {
+    #[clap(long)]
+    filename: bool,
+
+    #[clap(long)]
+    default: bool,
+}
+
+impl ConfigCommand {
+    fn run(&self, global: &Args) -> Result<(), AmbientRunError> {
+        if self.default && self.filename {
+            Self::show(default_config_file()?.as_path())?;
+        } else if self.filename {
+            Self::show_if(default_config_file()?.as_path())?;
+            for filename in &global.config {
+                Self::show_if(filename)?;
+            }
+        } else {
+            let mut filenames = global.config.clone();
+            filenames.insert(0, default_config_file()?);
+            let config = Config::load(&filenames)?;
+            println!("{}", config.as_yaml()?);
+        }
+        Ok(())
+    }
+
+    fn show_if(filename: &Path) -> Result<(), AmbientRunError> {
+        if filename.exists() {
+            Self::show(canonical(filename)?.as_path())?;
+        }
+        Ok(())
+    }
+
+    fn show(filename: &Path) -> Result<(), AmbientRunError> {
+        println!("{}", filename.display());
+        Ok(())
+    }
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..610a44b
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,89 @@
+//! ambient-run configuration file handling.
+use directories_next::ProjectDirs;
+use serde::{Deserialize, Serialize};
+use std::path::{Path, PathBuf};
+
+const QUAL: &str = "fi.liw.ambient-ci";
+const ORG: &str = "The Ambient CI project";
+const APP: &str = "ambient-run";
+const CONFIG: &str = "config.yaml";
+
+/// Per-user run-time configuration.
+#[derive(Debug, Default, Serialize, Deserialize)]
+pub struct Config {
+    /// Maximum number of virtual CPUs the build VM may have.
+    pub max_cpus: usize,
+}
+
+impl Config {
+    /// Load full configuration from defaults and all files.
+    pub fn load(filenames: &[PathBuf]) -> Result<Self, ConfigError> {
+        let mut config = Self::default();
+        for filename in filenames {
+            config.add_from(filename)?;
+        }
+        Ok(config)
+    }
+
+    /// Load named configuration file, update self with values.
+    pub fn add_from(&mut self, filename: &Path) -> Result<(), ConfigError> {
+        eprintln!("adding from {}", filename.display());
+        let bytes = std::fs::read(filename).map_err(|e| ConfigError::Open(filename.into(), e))?;
+        let text = String::from_utf8_lossy(&bytes);
+        eprintln!("text: {:?}", text);
+        let snippet: ConfigSnippet =
+            serde_yaml::from_str(&text).map_err(|e| ConfigError::Yaml(filename.into(), e))?;
+        eprintln!("snippet: {:#?}", snippet);
+        if let Some(n) = snippet.max_cpus {
+            self.max_cpus = n;
+        }
+        Ok(())
+    }
+
+    /// Serialize the configuration into a YAML string.
+    pub fn as_yaml(&self) -> Result<String, ConfigError> {
+        serde_yaml::to_string(self).map_err(ConfigError::AsYaml)
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct ConfigSnippet {
+    max_cpus: Option<usize>,
+}
+
+/// Return canonical path name to default configuration file.
+pub fn default_config_file() -> Result<PathBuf, ConfigError> {
+    if let Some(proj_dirs) = ProjectDirs::from(QUAL, ORG, APP) {
+        Ok(proj_dirs.config_dir().join(CONFIG))
+    } else {
+        Err(ConfigError::NoDefaultConfig)
+    }
+}
+
+/// Canonical path name for a configuration file.
+pub fn canonical(filename: &Path) -> Result<PathBuf, ConfigError> {
+    filename
+        .canonicalize()
+        .map_err(|e| ConfigError::Canonical(filename.into(), e))
+}
+
+/// Possible errors from configuration file handling.
+#[allow(missing_docs)]
+#[derive(Debug, thiserror::Error)]
+pub enum ConfigError {
+    #[error("failed to determine default configuration file, reason unknown")]
+    NoDefaultConfig,
+
+    #[error("failed to open configuration file {0}")]
+    Open(PathBuf, #[source] std::io::Error),
+
+    #[error("failed to parse configuration file as YAML: {0}")]
+    Yaml(PathBuf, #[source] serde_yaml::Error),
+
+    #[error("failed to convert configuration file name into canonical form: {0}")]
+    Canonical(PathBuf, #[source] std::io::Error),
+
+    #[error("failed to serialize configuration as YAML")]
+    AsYaml(#[source] serde_yaml::Error),
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..6f50944
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,8 @@
+//! All errors returned form ambient-run library.
+
+#[allow(missing_docs)]
+#[derive(Debug, thiserror::Error)]
+pub enum AmbientRunError {
+    #[error(transparent)]
+    Config(#[from] crate::config::ConfigError),
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ecae1e8
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,6 @@
+//! Functionality of ambient-run as a library.
+
+#![deny(missing_docs)]
+
+pub mod config;
+pub mod error;
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a9..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}
diff --git a/subplot/ambient-run.rs b/subplot/ambient-run.rs
new file mode 100644
index 0000000..37c2a8c
--- /dev/null
+++ b/subplot/ambient-run.rs
@@ -0,0 +1,42 @@
+// Implementations of Subplot scenario steps for ambient-run.
+
+use serde_yaml::Value;
+use subplotlib::steplibrary::files::Files;
+use subplotlib::steplibrary::runcmd::Runcmd;
+
+use std::path::Path;
+
+#[derive(Debug, Default)]
+struct SubplotContext {}
+
+impl ContextElement for SubplotContext {}
+
+#[step]
+#[context(SubplotContext)]
+#[context(Runcmd)]
+fn install_ambient_run(context: &ScenarioContext) {
+    let target_exe = env!("CARGO_BIN_EXE_ambient-run");
+    let target_path = Path::new(target_exe);
+    let target_path = target_path.parent().ok_or("No parent?")?;
+    context.with_mut(
+        |context: &mut Runcmd| {
+            context.prepend_to_path(target_path);
+            Ok(())
+        },
+        false,
+    )?;
+}
+
+#[step]
+#[context(SubplotContext)]
+#[context(Runcmd)]
+#[context(Files)]
+fn stdout_matches_yaml(context: &ScenarioContext, file: SubplotDataFile) {
+    let stdout = context.with_mut(|context: &mut Runcmd| Ok(context.stdout_as_string()), false)?;
+    let actual: Value = serde_yaml::from_str(&stdout)?;
+    println!("Actual:\n{actual:#?}");
+    let expected = String::from_utf8_lossy(file.data());
+    let expected: Value = serde_yaml::from_str(&expected)?;
+    println!("Expected:\n{expected:#?}");
+    assert_eq!(actual, expected);
+}
diff --git a/subplot/ambient-run.yaml b/subplot/ambient-run.yaml
new file mode 100644
index 0000000..8a8c1d6
--- /dev/null
+++ b/subplot/ambient-run.yaml
@@ -0,0 +1,8 @@
+- given: an installed ambient-run
+  impl:
+    rust:
+      function: install_ambient_run
+- then: stdout, as YAML, matches file {file:file}
+  impl:
+    rust:
+      function: stdout_matches_yaml
diff --git a/tests/ambient-run.rs b/tests/ambient-run.rs
new file mode 100644
index 0000000..2603519
--- /dev/null
+++ b/tests/ambient-run.rs
@@ -0,0 +1 @@
+include!(concat!(env!("OUT_DIR"), "/ambient-run.rs"));