Support checking for version updates for images that aren't available locally

src/check.rs

@@ -1,6 +1,6 @@
 use futures::future::join_all;
 use itertools::Itertools;
-use rustc_hash::FxHashMap;
+use rustc_hash::{FxHashMap, FxHashSet};
 
 use crate::{
     config::Config,
@@ -13,7 +13,24 @@ use crate::{
 /// Returns a list of updates for all images passed in.
 pub async fn get_updates(references: &Option<Vec<String>>, config: &Config) -> Vec<Image> {
     // Get images
-    let images = get_images_from_docker_daemon(config, references).await;
+    let mut images = get_images_from_docker_daemon(config, references).await;
+    let extra_images = match references {
+        Some(refs) => {
+            let image_refs: FxHashSet<&String> = images.iter().map(|image| &image.reference).collect();
+            let extra = refs.iter().filter(|&reference| !image_refs.contains(reference)).collect::<Vec<&String>>();
+            let mut handles = Vec::with_capacity(extra.len());
+
+            for reference in extra {
+                let future = Image::from_reference(reference);
+                handles.push(future)
+            }
+            Some(join_all(handles).await)
+        },
+        None => None
+    };
+    if let Some(extra_imgs) = extra_images {
+        images.extend_from_slice(&extra_imgs);
+    }
 
     // Get a list of unique registries our images belong to. We are unwrapping the registry because it's guaranteed to be there.
     let registries: Vec<&String> = images
@@ -55,7 +72,7 @@ pub async fn get_updates(references: &Option<Vec<String>>, config: &Config) -> V
     }
 
     // Create a Vec to store futures so we can await them all at once.
-    let mut handles = Vec::new();
+    let mut handles = Vec::with_capacity(images.len());
     // Loop through images and get the latest digest for each
     for image in &images {
         let token = tokens.get(image.registry.as_str()).unwrap();

src/registry.rs

@@ -150,7 +150,7 @@ pub async fn get_latest_tag(
     };
     match tag {
         Some(t) => {
-            if t == base {
+            if t == base && image.digest_info.is_some() {
                 // Tags are equal so we'll compare digests
                 get_latest_digest(
                     &Image {

src/structs/image.rs

@@ -2,6 +2,7 @@ use json::{object, JsonValue};
 
 use crate::{
     config::Config,
+    error,
     http::Client,
     registry::{get_latest_digest, get_latest_tag},
     structs::{status::Status, version::Version},
@@ -40,7 +41,7 @@ pub struct Image {
 }
 
 impl Image {
-    /// Creates an populates the fields of an Image object based on the ImageSummary from the Docker daemon
+    /// Creates and populates the fields of an Image object based on the ImageSummary from the Docker daemon
     pub async fn from_inspect_data<T: InspectData>(image: T) -> Option<Self> {
         let tags = image.tags().unwrap();
         let digests = image.digests().unwrap();
@@ -61,8 +62,8 @@ impl Image {
                     local_digests,
                     remote_digest: None,
                 }),
-                version_info: version_tag.map(|stag| VersionInfo {
+                version_info: version_tag.map(|vtag| VersionInfo {
-                    current_tag: stag,
+                    current_tag: vtag,
                     latest_remote_tag: None,
                 }),
                 ..Default::default()
@@ -72,6 +73,29 @@ impl Image {
         }
     }
 
+    /// Creates and populates the fields of an Image object based on a reference. If the tag is not recognized as a version string, exits the program with an error.
+    pub async fn from_reference(reference: &str) -> Self {
+        let (registry, repository, tag) = split(&reference);
+        let version_tag = Version::from_tag(&tag);
+        match version_tag {
+            Some(version) => Self {
+                reference: reference.to_string(),
+                registry,
+                repository,
+                tag,
+                version_info: Some(VersionInfo {
+                    current_tag: version,
+                    latest_remote_tag: None,
+                }),
+                ..Default::default()
+            },
+            None => error!(
+                "Image {} is not available locally and does not have a recognizable tag format!",
+                reference
+            ),
+        }
+    }
+
     /// Compares remote digest of the image with its local digests to determine if it has an update or not
     pub fn has_update(&self) -> Status {
         if self.error.is_some() {