Resolve Gitea release downloads

src/bin/dosh-client.rs

@@ -1110,6 +1110,38 @@ fn latest_release_download_url(repo: &str, artifact: &str) -> Option<String> {
     Some(format!("{web}/releases/latest/download/{artifact}"))
 }
 
+fn latest_release_tag_download_url(repo: &str, artifact: &str) -> Result<Option<String>> {
+    let web = repo
+        .strip_suffix(".git")
+        .unwrap_or(repo)
+        .trim_end_matches('/');
+    if !web.starts_with("http://") && !web.starts_with("https://") {
+        return Ok(None);
+    }
+    let output = Command::new("curl")
+        .arg("-fsSL")
+        .arg("-o")
+        .arg("/dev/null")
+        .arg("-w")
+        .arg("%{url_effective}")
+        .arg(format!("{web}/releases/latest"))
+        .stdin(Stdio::null())
+        .output()
+        .with_context(|| format!("resolve latest release for {web}"))?;
+    if !output.status.success() {
+        return Ok(None);
+    }
+    let effective = String::from_utf8_lossy(&output.stdout);
+    let prefix = format!("{web}/releases/tag/");
+    let Some(tag) = effective.strip_prefix(&prefix) else {
+        return Ok(None);
+    };
+    if tag.is_empty() {
+        return Ok(None);
+    }
+    Ok(Some(format!("{web}/releases/download/{tag}/{artifact}")))
+}
+
 fn url_reachable(url: &str) -> Result<bool> {
     let status = Command::new("curl")
         .arg("-fsIL")
@@ -1130,19 +1162,23 @@ fn run_update(config: &dosh::config::ClientConfig, check_only: bool) -> Result<(
     let raw_base = raw_base_from_repo(&repo);
     let installer = format!("{raw_base}/raw/branch/main/install.sh");
     let artifact = release_artifact_name();
-    let binary_url = latest_release_download_url(&repo, artifact);
     if check_only {
         println!("dosh {}", env!("CARGO_PKG_VERSION"));
         println!("repo: {repo}");
         println!("installer: {installer}");
-        if let Some(binary_url) = &binary_url {
-            let status = if url_reachable(binary_url)? {
-                "available"
-            } else {
-                "missing"
-            };
+        if let Some(latest_url) = latest_release_download_url(&repo, artifact) {
+            let mut status = "missing";
+            let mut display_url = latest_url.clone();
+            if url_reachable(&latest_url)? {
+                status = "available";
+            } else if let Some(tag_url) = latest_release_tag_download_url(&repo, artifact)?
+                && url_reachable(&tag_url)?
+            {
+                status = "available";
+                display_url = tag_url;
+            }
             println!("prebuilt: {status} ({artifact})");
-            println!("prebuilt_url: {binary_url}");
+            println!("prebuilt_url: {display_url}");
         } else {
             println!("prebuilt: unavailable for non-HTTP repo");
         }