fix: include OCI image manifest MIME type in Accept header when

checking for a digest update

Closes #132

Cargo.lock

@@ -376,7 +376,7 @@ dependencies = [
 
 [[package]]
 name = "cup"
-version = "3.3.0"
+version = "3.4.2"
 dependencies = [
  "bollard",
  "chrono",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cup"
-version = "3.3.0"
+version = "3.4.2"
 edition = "2021"
 
 [dependencies]

docs/src/content/docs/configuration/automatic-refresh.mdx

@@ -1,3 +1,5 @@
+import { Callout } from "nextra/components";
+
 # Automatic refresh
 
 Cup can automatically refresh the results when running in server mode. Simply add this to your config:
@@ -9,4 +11,8 @@ Cup can automatically refresh the results when running in server mode. Simply ad
 }
 ```
 
-You can use a cron expression to specify the refresh interval. Note that seconds are not optional. The reference is [here](https://github.com/Hexagon/croner-rust#pattern)
+You can use a cron expression to specify the refresh interval. Note that seconds are not optional. The reference is [here](https://github.com/Hexagon/croner-rust#pattern).
+
+<Callout>
+    If you use a schedule with absolute time (e.g. every day at 6 AM), make sure to set the `TZ` environment variable to your [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List).
+</Callout>

docs/src/content/docs/configuration/index.mdx

@@ -109,3 +109,36 @@ $ docker run -tv /var/run/docker.sock:/var/run/docker.sock -v /home/sergio/.conf
 ```
 
 </Steps>
+
+## Environment Variables
+
+Want to make a quick change without editing your `config.json`? Cup also supports some configuration options from environment variables.
+Here are the ones currently available:
+- `CUP_AGENT` - Agent mode
+- `CUP_IGNORE_UPDATE_TYPE` - Ignoring specific update types
+- `CUP_REFRESH_INTERVAL` - Automatic refresh
+- `CUP_SOCKET` - Socket
+- `CUP_THEME` - Theme
+
+Refer to the configuration page for more information on each of these.
+
+Here's an example of a Docker Compose file using them:
+```yaml
+services:
+  cup:
+    image: ghcr.io/sergi0g/cup:latest
+    command: serve
+    ports:
+      - 8000:8000
+    environment:
+      - CUP_AGENT: true
+      - CUP_IGNORE_UPDATE_TYPE: major
+      - CUP_REFRESH_INTERVAL: "0 */30 * * * *"
+      - CUP_SOCKET: tcp://localhost:2375
+      - CUP_THEME: blue
+```
+
+<Callout>
+    Heads up!
+    Any configuration option you set with environment variables **always** overrides anything in your `cup.json`.
+</Callout>

src/config.rs

@@ -1,5 +1,6 @@
 use rustc_hash::FxHashMap;
 use serde::Deserialize;
+use serde::Deserializer;
 use std::env;
 use std::mem;
 use std::path::PathBuf;
@@ -64,6 +65,7 @@ pub struct Config {
     pub agent: bool,
     pub ignore_update_type: UpdateType,
     pub images: ImageConfig,
+    #[serde(deserialize_with = "empty_as_none")]
     pub refresh_interval: Option<String>,
     pub registries: FxHashMap<String, RegistryConfig>,
     pub servers: FxHashMap<String, String>,
@@ -151,3 +153,15 @@ impl Default for Config {
         Self::new()
     }
 }
+
+fn empty_as_none<'de, D>(deserializer: D) -> Result<Option<String>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s = String::deserialize(deserializer)?;
+    if s.is_empty() {
+        Ok(None)
+    } else {
+        Ok(Some(s))
+    }
+}

src/registry.rs

@@ -58,7 +58,7 @@ pub async fn get_latest_digest(
         protocol, &image.parts.registry, &image.parts.repository, &image.parts.tag
     );
     let authorization = to_bearer_string(&token);
-    let headers = [("Accept", Some("application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.index.v1+json")), ("Authorization", authorization.as_deref())];
+    let headers = [("Accept", Some("application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.index.v1+json, application/vnd.oci.image.manifest.v1+json")), ("Authorization", authorization.as_deref())];
 
     let response = client.head(&url, &headers).await;
     let time = start.elapsed().unwrap().as_millis() as u32;