Add script to check for podman image updates

lib/dockerhub.nu

@@ -0,0 +1,18 @@
+export def get_image_digest [image: string] {
+  let token = ( get_token $image )
+  mut headers = ( [] 
+    | append [Accept "application/vnd.docker.distribution.manifest.v2+json"]
+    | append [Authorization $"Bearer ($token)"]
+  ) 
+  print $headers
+
+  ( http get -H $headers $"https://registry.hub.docker.com/v2/($image)/manifests/latest"
+    | from json
+    | get config 
+    | get digest
+  )
+}
+
+def get_token [image: string] {
+  http get $"https://auth.docker.io/token?scope=repository:($image):pull&service=registry.docker.io" | get token
+}

podman-update-check

@@ -0,0 +1,49 @@
+#!/bin/env nu
+use ./lib/cntfy.nu
+use ./lib/dockerhub.nu
+
+def main [  
+  --ntfy: bool
+] { 
+  let images = ( get_images )
+  let image_count = ( $images | length )
+  if $image_count  == 0 {
+    print "No images found"
+    return
+  }
+  print $"($image_count) local image[s] found"
+
+  ( $images
+    | where { |$it| $it.Names? != null } 
+    | insert Name {|$it| $it.Names | first } 
+    | where {|| needs_update }
+    | each {|| print_needs_update $ntfy }
+  )
+}
+
+def get_images [] {
+  podman images --no-trunc --format json | from json 
+}
+
+export def needs_update [] {
+  let data = $in
+  let name_parts = ( $data.Name | split row "/" --number 2 ) 
+  let host = ( $name_parts | first )
+  let image = ( $name_parts | last | split row ":" | get 0 )
+  let digest = $data.Digest
+
+  if $host == "docker.io/" {
+    ( dockerhub get_image_digest $image ) == digest
+  } else {
+    false
+  }
+}
+
+def print_needs_update [ntfy: bool] {
+  let data = $in
+  print $"Image `($data.Name)` needs to be updated."
+
+  if $ntfy {
+      cntfy publish --tags [ podman $data.Name ] --title $"($data.Name) outdated" "updates" $"Container ($data.Name) needs to be updated."
+  }
+}