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feat(docker_context): Use DOCKER_HOST and DOCKER_CONTEXT enviroment variables (#2782)

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* feat(docker_context): Use DOCKER_HOST and DOCKER_CONTEXT enviroment variables for docker context

* Updating documentation for Docker context
This commit is contained in:
Lorenzo Tucci 2021-07-03 21:38:39 +00:00 committed by GitHub
parent a4a2adb0f8
commit 446ef03b4d
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2 changed files with 147 additions and 43 deletions
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3
docs/config/README.md
View File

@ -791,7 +791,8 @@ truncation_symbol = "…/"
The `docker_context` module shows the currently active
[Docker context](https://docs.docker.com/engine/context/working-with-contexts/) if it's not set to
`default`.
`default` or if the `DOCKER_HOST` or `DOCKER_CONTEXT` environment variables are set (as they are meant
to override the context in use).
### Options

135
src/modules/docker_context.rs
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@ -9,10 +9,16 @@ use crate::utils;
/// Creates a module with the currently active Docker context
///
/// Will display the Docker context if the following criteria are met:
/// - There is a file named `$HOME/.docker/config.json`
/// - There is a non-empty enviroment variable named DOCKER_HOST
/// - Or there is a non-empty enviroment variable named DOCKER_CONTEXT
/// - Or there is a file named `$HOME/.docker/config.json`
/// - Or a file named `$DOCKER_CONFIG/config.json`
/// - The file is JSON and contains a field named `currentContext`
/// - The value of `currentContext` is not `default`
/// - If multiple criterias are met, we use the following order to define the docker context:
/// - DOCKER_HOST, DOCKER_CONTEXT, $HOME/.docker/config.json, $DOCKER_CONFIG/config.json
/// - (This is the same order docker follows, as DOCKER_HOST and DOCKER_CONTEXT override the
/// config)
pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
let mut module = context.new_module("docker_context");
let config: DockerContextConfig = DockerContextConfig::try_load(module.config);
@ -35,18 +41,21 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
)
.join("config.json");
let docker_context_env = std::array::IntoIter::new(["DOCKER_HOST", "DOCKER_CONTEXT"])
.find_map(|env| context.get_env(env));
let ctx = match docker_context_env {
Some(data) => data,
_ => {
if !docker_config.exists() {
return None;
}
let json = utils::read_file(docker_config).ok()?;
let parsed_json = serde_json::from_str(&json).ok()?;
let parsed_json: serde_json::Value = serde_json::from_str(&json).ok()?;
parsed_json.get("currentContext")?.as_str()?.to_owned()
}
};
match parsed_json {
serde_json::Value::Object(root) => {
let current_context = root.get("currentContext")?;
match current_context {
serde_json::Value::String(ctx) => {
let parsed = StringFormatter::new(config.format).and_then(|formatter| {
formatter
.map_meta(|variable, _| match variable {
@ -58,7 +67,7 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
_ => None,
})
.map(|variable| match variable {
"context" => Some(Ok(ctx)),
"context" => Some(Ok(ctx.as_str())),
_ => None,
})
.parse(None)
@ -71,15 +80,8 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
return None;
}
});
Some(module)
}
_ => None,
}
}
_ => None,
}
}
#[cfg(test)]
mod tests {
@ -264,4 +266,105 @@ mod tests {
cfg_dir.close()
}
#[test]
fn test_docker_host_env() -> io::Result<()> {
let cfg_dir = tempfile::tempdir()?;
let actual = ModuleRenderer::new("docker_context")
.env("DOCKER_HOST", "udp://starship@127.0.0.1:53")
.config(toml::toml! {
[docker_context]
only_with_files = false
})
.collect();
let expected = Some(format!(
"via {} ",
Color::Blue.bold().paint("🐳 udp://starship@127.0.0.1:53")
));
assert_eq!(expected, actual);
cfg_dir.close()
}
#[test]
fn test_docker_context_env() -> io::Result<()> {
let cfg_dir = tempfile::tempdir()?;
let actual = ModuleRenderer::new("docker_context")
.env("DOCKER_CONTEXT", "starship")
.config(toml::toml! {
[docker_context]
only_with_files = false
})
.collect();
let expected = Some(format!("via {} ", Color::Blue.bold().paint("🐳 starship")));
assert_eq!(expected, actual);
cfg_dir.close()
}
#[test]
fn test_docker_context_overrides_config() -> io::Result<()> {
let cfg_dir = tempfile::tempdir()?;
let cfg_file = cfg_dir.path().join("config.json");
let config_content = serde_json::json!({
"currentContext": "starship"
});
let mut docker_config = File::create(&cfg_file)?;
docker_config.write_all(config_content.to_string().as_bytes())?;
docker_config.sync_all()?;
let actual = ModuleRenderer::new("docker_context")
.env("DOCKER_CONTEXT", "starship")
.env("DOCKER_CONFIG", cfg_dir.path().to_string_lossy())
.config(toml::toml! {
[docker_context]
only_with_files = false
})
.collect();
let expected = Some(format!("via {} ", Color::Blue.bold().paint("🐳 starship")));
assert_eq!(expected, actual);
cfg_dir.close()
}
#[test]
fn test_docker_host_overrides_docker_context_env_and_conf() -> io::Result<()> {
let cfg_dir = tempfile::tempdir()?;
let cfg_file = cfg_dir.path().join("config.json");
let config_content = serde_json::json!({
"currentContext": "starship"
});
let mut docker_config = File::create(&cfg_file)?;
docker_config.write_all(config_content.to_string().as_bytes())?;
docker_config.sync_all()?;
let actual = ModuleRenderer::new("docker_context")
.env("DOCKER_HOST", "udp://starship@127.0.0.1:53")
.env("DOCKER_CONTEXT", "starship")
.env("DOCKER_CONFIG", cfg_dir.path().to_string_lossy())
.config(toml::toml! {
[docker_context]
only_with_files = false
})
.collect();
let expected = Some(format!(
"via {} ",
Color::Blue.bold().paint("🐳 udp://starship@127.0.0.1:53")
));
assert_eq!(expected, actual);
cfg_dir.close()
}
}