49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
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use anyhow::{Context, Result};
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use serde::Deserialize;
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use std::path::{Path, PathBuf};
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#[derive(Debug, Deserialize)]
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struct Release {
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assets: Vec<Asset>,
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}
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#[derive(Debug, Deserialize)]
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struct Asset {
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name: String,
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browser_download_url: String,
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}
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/// Downloads the release asset named exactly `asset_name` for `repo`@`tag`
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/// into `dest_dir`, returning the local path.
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pub fn download_asset(
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client: &reqwest::blocking::Client,
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repo: &str,
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tag: &str,
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asset_name: &str,
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dest_dir: &Path,
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) -> Result<PathBuf> {
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let api_url = format!("https://api.github.com/repos/{repo}/releases/tags/{tag}");
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let release: Release = client
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.get(&api_url)
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.send()?
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.error_for_status()
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.with_context(|| format!("fetching release metadata from {api_url}"))?
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.json()?;
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let asset = release
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.assets
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.iter()
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.find(|a| a.name == asset_name)
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.with_context(|| format!("no asset named '{asset_name}' in {repo}@{tag}"))?;
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std::fs::create_dir_all(dest_dir)?;
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let dest_path = dest_dir.join(&asset.name);
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let bytes = client
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.get(&asset.browser_download_url)
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.send()?
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.error_for_status()?
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.bytes()?;
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std::fs::write(&dest_path, &bytes)?;
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Ok(dest_path)
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}
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