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Replace image download with vm-manager ImageManager

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Use vm-manager's ImageManager::download() for streaming image downloads
with automatic zstd decompression, replacing the hand-rolled reqwest +
zstd code. Supports http(s), file://, and OCI artifact URLs.
This commit is contained in:
Till Wegmueller 2026-04-07 15:52:02 +02:00
parent 190eb5532f
commit 2d971ef500
1 changed files with 16 additions and 80 deletions
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96
crates/orchestrator/src/config.rs
View file

@ -103,9 +103,17 @@ fn default_example_path() -> PathBuf {
}
/// Ensure images referenced in config exist at local_path. If missing, fetch
/// from `source` (supports http(s):// and file://) and optionally decompress
/// according to `decompress`.
/// from `source` using vm-manager's ImageManager (supports http(s), file://,
/// oci://, streaming downloads, and zstd decompression).
pub async fn ensure_images(cfg: &OrchestratorConfig) -> Result<()> {
let cache_dir = cfg
.images
.values()
.next()
.and_then(|img| img.local_path.parent())
.unwrap_or(Path::new("/var/lib/solstice/images"));
let img_mgr = vm_manager::image::ImageManager::with_cache_dir(cache_dir.to_path_buf());
for (label, image) in cfg.images.iter() {
if image.local_path.exists() {
continue;
@ -115,85 +123,13 @@ pub async fn ensure_images(cfg: &OrchestratorConfig) -> Result<()> {
tokio::fs::create_dir_all(parent).await.into_diagnostic()?;
}
let source = image.source.as_str();
let is_file = source.starts_with("file://");
let tmp_path = image.local_path.with_extension("part");
tracing::info!(label = %label, source = %image.source, local = ?image.local_path, "downloading base image via vm-manager");
if is_file {
// Local file source: copy or decompress from local path
let src_path = PathBuf::from(&source[7..]); // naive parse; paths should be absolute
tracing::info!(label = %label, src = ?src_path, local = ?image.local_path, "preparing base image from file:// source");
match image.decompress.unwrap_or(Decompress::None) {
Decompress::None => {
// Copy to temporary then atomically move into place
tokio::fs::copy(&src_path, &tmp_path)
.await
.into_diagnostic()?;
tokio::fs::rename(&tmp_path, &image.local_path)
.await
.into_diagnostic()?;
}
Decompress::Zstd => {
let src = src_path.clone();
let tmp_out = tmp_path.clone();
task::spawn_blocking(move || -> miette::Result<()> {
let infile = fs::File::open(&src).into_diagnostic()?;
let mut decoder =
zstd::stream::read::Decoder::new(infile).into_diagnostic()?;
let mut outfile = fs::File::create(&tmp_out).into_diagnostic()?;
std::io::copy(&mut decoder, &mut outfile).into_diagnostic()?;
Ok(())
})
.await
.into_diagnostic()??;
tokio::fs::rename(&tmp_path, &image.local_path)
.await
.into_diagnostic()?;
}
}
} else {
// Remote URL (HTTP/HTTPS): download to temporary file first
tracing::info!(label = %label, url = %image.source, local = ?image.local_path, "downloading base image");
let resp = reqwest::get(&image.source).await.into_diagnostic()?;
let status = resp.status();
if !status.is_success() {
miette::bail!(
"failed to download {url}: {status}",
url = image.source,
status = status
);
}
let bytes = resp.bytes().await.into_diagnostic()?;
tokio::fs::write(&tmp_path, &bytes)
.await
.into_diagnostic()?;
// Decompress or move into place
match image.decompress.unwrap_or(Decompress::None) {
Decompress::None => {
tokio::fs::rename(&tmp_path, &image.local_path)
.await
.into_diagnostic()?;
}
Decompress::Zstd => {
let src = tmp_path.clone();
let dst = image.local_path.clone();
task::spawn_blocking(move || -> miette::Result<()> {
let infile = fs::File::open(&src).into_diagnostic()?;
let mut decoder =
zstd::stream::read::Decoder::new(infile).into_diagnostic()?;
let mut outfile = fs::File::create(&dst).into_diagnostic()?;
std::io::copy(&mut decoder, &mut outfile).into_diagnostic()?;
// remove compressed temp
std::fs::remove_file(&src).ok();
Ok(())
})
.await
.into_diagnostic()??;
}
}
}
// Use vm-manager's ImageManager for streaming download + decompression
img_mgr
.download(&image.source, &image.local_path)
.await
.into_diagnostic()?;
tracing::info!(label = %label, local = ?image.local_path, "image ready");
}