Function extract_version_from_image_name

dstack-mr/src/lib.rs:61–77

Extract the `MAJOR.MINOR.PATCH` version suffix from a dstack image name. Recognises any ` -MAJOR.MINOR.PATCH[.SUFFIX]` shape, e.g. `dstack-0.5.10`, `dstack-dev-0.5.10`, `dstack-nvidia-0.5.10`, `dstack-nvidia-dev-0.5.10`, `dstack-0.5.10.rc1`, `dstack-dev-0.6.1.dev`. The optional `.SUFFIX` is permitted to be non-numeric (pre-release tag, build label, etc.) and is dropped from the returned s

(image: &str)

/// Returns `None` when the segment after the last `-` is not at least a valid
/// `X.Y.Z` triple of non-empty numeric components.
pub fn extract_version_from_image_name(image: &str) -> Option<&str> {
    let tail = image.rsplit('-').next()?;
    let parts: Vec<&str> = tail.split('.').collect();
    if !(3..=4).contains(&parts.len()) {
        return None;
    }
    let core_numeric = parts[..3]
        .iter()
        .all(|p| !p.is_empty() && p.parse::<u32>().is_ok());
    let suffix_ok = parts.len() == 3 || !parts[3].is_empty();
    if !(core_numeric && suffix_ok) {
        return None;
    }
    // Slice off the optional `.SUFFIX` so callers get just `X.Y.Z`.
    let core_len = parts[0].len() + 1 + parts[1].len() + 1 + parts[2].len();
    Some(&tail[..core_len])
}

/// Pick the OVMF variant from an image name like `dstack-0.5.10`.
///