initium 2.1.0

Swiss-army toolbox for Kubernetes initContainers — wait-for, seed, render, fetch in a single static Rust binary
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use crate::logging::Logger;
use crate::render as render_lib;
use crate::safety;
use std::fs;

pub fn run(
    log: &Logger,
    template: &str,
    output: &str,
    workdir: &str,
    mode: &str,
) -> Result<(), String> {
    if template.is_empty() {
        return Err("--template is required".into());
    }
    if output.is_empty() {
        return Err("--output is required".into());
    }
    if mode != "envsubst" && mode != "gotemplate" {
        return Err(format!(
            "--mode must be envsubst or gotemplate, got {:?}",
            mode
        ));
    }

    let out_path = safety::validate_file_path(workdir, output)?;
    let data = fs::read_to_string(template)
        .map_err(|e| format!("reading template {}: {}", template, e))?;

    log.info(
        "rendering template",
        &[
            ("template", template),
            ("output", out_path.to_str().unwrap_or("")),
            ("mode", mode),
        ],
    );

    let result = match mode {
        "envsubst" => render_lib::envsubst(&data),
        "gotemplate" => render_lib::template_render(&data)?,
        _ => unreachable!(),
    };

    if let Some(parent) = out_path.parent() {
        fs::create_dir_all(parent).map_err(|e| format!("creating output directory: {}", e))?;
    }
    fs::write(&out_path, result).map_err(|e| format!("writing output {:?}: {}", out_path, e))?;
    log.info(
        "render completed",
        &[("output", out_path.to_str().unwrap_or(""))],
    );
    Ok(())
}