record haze version when building images and warn on out of date images

src/image.rs

@@ -5,11 +5,48 @@ use futures_util::StreamExt;
 use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
 use miette::{IntoDiagnostic, Result, WrapErr};
 use std::collections::HashMap;
+use std::fmt::{Display, Formatter};
+use std::str::FromStr;
+
+#[derive(Debug, Copy, Clone, PartialOrd, PartialEq)]
+pub struct ImageVersion {
+    pub major: u8,
+    pub minor: u8,
+    pub patch: u8,
+}
+
+impl FromStr for ImageVersion {
+    type Err = ();
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        let mut parts = s.split('.');
+        let major = parts.next().ok_or(())?.parse().map_err(|_| ())?;
+        let minor = parts.next().ok_or(())?.parse().map_err(|_| ())?;
+        let patch = parts.next().ok_or(())?.parse().map_err(|_| ())?;
+        Ok(ImageVersion {
+            major,
+            minor,
+            patch,
+        })
+    }
+}
+
+impl Display for ImageVersion {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}.{}.{}", self.major, self.minor, self.patch)
+    }
+}
 
 pub async fn image_exists(docker: &Docker, image: &str) -> bool {
     docker.inspect_image(image).await.is_ok()
 }
 
+pub async fn image_version(docker: &Docker, image: &str) -> Option<ImageVersion> {
+    let labels = docker.inspect_image(image).await.ok()?.config?.labels?;
+    let label = labels.get("nl.icewind.haze.version")?;
+    ImageVersion::from_str(label).ok()
+}
+
 pub async fn update_image(docker: &Docker, image: &str) -> Result<()> {
     if image_exists(docker, image).await {
         force_pull_image(docker, image).await?;