add option to disable cache.nixos.org

README.md

@@ -30,8 +30,8 @@ Options:
           If unspecified, will get it form AWS_DEFAULT_REGION envar or default to us-east-1
       --endpoint <ENDPOINT>
           If unspecifed, will get it from AWS_ENDPOINT envar e.g. https://s3.example.com
-      --skip-signature-check
+      --no-default-upstream
-          
+          Do not include cache.nixos.org as upstream
   -h, --help
           Print help
 ```

src/lib.rs

@@ -55,8 +55,9 @@ pub struct PushArgs {
     #[arg(long)]
     endpoint: Option<String>,
 
+    /// Do not include cache.nixos.org as upstream
     #[arg(long)]
-    skip_signature_check: bool,
+    no_default_upstream: bool,
 
     /// Path to upload
     /// e.g. ./result or /nix/store/y4qpcibkj767szhjb58i2sidmz8m24hb-hello-2.12.1

src/push.rs

@@ -1,7 +1,6 @@
 use std::{
     collections::HashSet,
     fs,
-    iter::once,
     path::PathBuf,
     sync::{
         Arc,
@@ -39,11 +38,13 @@ pub struct Push {
 impl Push {
     pub async fn new(cli: &PushArgs, store: Store) -> Result<Self> {
         let mut upstreams = Vec::with_capacity(cli.upstreams.len() + 1);
-        for upstream in cli
+        if !cli.no_default_upstream {
-            .upstreams
+            upstreams.push(
-            .iter()
+                Url::parse("https://cache.nixos.org")
-            .chain(once(&"https://cache.nixos.org".to_string()))
+                    .expect("default upstream must be a valid url"),
-        {
+            );
+        }
+        for upstream in &cli.upstreams {
             upstreams
                 .push(Url::parse(upstream).context(format!("failed to parse {upstream} as url"))?);
         }