Prevent update from using stale latest release

Cargo.lock

@@ -436,7 +436,7 @@ dependencies = [
 
 [[package]]
 name = "dosh"
-version = "1.0.0-rc41"
+version = "1.0.0-rc42"
 dependencies = [
  "anyhow",
  "base64",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "dosh"
-version = "1.0.0-rc41"
+version = "1.0.0-rc42"
 edition = "2024"
 license = "MIT"
 

src/bin/dosh-client.rs

@@ -4124,6 +4124,15 @@ fn update_version_status(local: &str, latest: &str) -> &'static str {
     }
 }
 
+fn update_binary_version_for_installer(local: &str, latest_tag: Option<&str>) -> Option<String> {
+    let latest = latest_tag.map(release_version_from_tag)?;
+    if compare_dotted_versions(latest, local) == std::cmp::Ordering::Less {
+        Some(format!("v{local}"))
+    } else {
+        None
+    }
+}
+
 fn compare_dotted_versions(left: &str, right: &str) -> std::cmp::Ordering {
     let left = parse_dotted_version(left);
     let right = parse_dotted_version(right);
@@ -4249,6 +4258,10 @@ fn run_update(config: &dosh::config::ClientConfig, options: UpdateOptions) -> Re
         .join("dosh")
         .join("source");
     let use_prebuilt = std::env::var("DOSH_USE_PREBUILT").unwrap_or_else(|_| "1".to_string());
+    let binary_version = update_binary_version_for_installer(
+        env!("CARGO_PKG_VERSION"),
+        latest_release_tag(&repo)?.as_deref(),
+    );
     let status = run_update_installer(
         config,
         &repo,
@@ -4256,6 +4269,7 @@ fn run_update(config: &dosh::config::ClientConfig, options: UpdateOptions) -> Re
         installer_role,
         &update_cache.display().to_string(),
         &use_prebuilt,
+        binary_version.as_deref(),
     )?;
     if !status.success() {
         return Err(anyhow!("dosh update failed with status {status}"));
@@ -4270,6 +4284,7 @@ fn run_update_installer(
     installer_role: &str,
     update_cache: &str,
     use_prebuilt: &str,
+    binary_version: Option<&str>,
 ) -> Result<std::process::ExitStatus> {
     if cfg!(windows) {
         let script = windows_update_script(
@@ -4279,6 +4294,7 @@ fn run_update_installer(
             installer_role,
             update_cache,
             use_prebuilt,
+            binary_version,
         );
         return Command::new("powershell.exe")
             .arg("-NoProfile")
@@ -4297,6 +4313,7 @@ fn run_update_installer(
         installer_role,
         update_cache,
         use_prebuilt,
+        binary_version,
     );
     Command::new("sh")
         .arg("-c")
@@ -4313,14 +4330,22 @@ fn unix_update_script(
     installer_role: &str,
     update_cache: &str,
     use_prebuilt: &str,
+    binary_version: Option<&str>,
 ) -> String {
-    let mut script = format!(
-        "curl -fsSL {} | DOSH_REPO={} DOSH_PORT={} DOSH_UPDATE_CACHE={} DOSH_UPDATE_QUIET=1 DOSH_USE_PREBUILT={} sh -s -- {}",
-        shell_word(installer),
+    let mut env = format!(
+        "DOSH_REPO={} DOSH_PORT={} DOSH_UPDATE_CACHE={} DOSH_UPDATE_QUIET=1 DOSH_USE_PREBUILT={}",
         shell_word(repo),
         config.update_port.unwrap_or(config.dosh_port),
         shell_word(update_cache),
-        shell_word(use_prebuilt),
+        shell_word(use_prebuilt)
+    );
+    if let Some(version) = binary_version {
+        env.push_str(&format!(" DOSH_BINARY_VERSION={}", shell_word(version)));
+    }
+    let mut script = format!(
+        "curl -fsSL {} | {} sh -s -- {}",
+        shell_word(installer),
+        env,
         shell_word(installer_role)
     );
     if config.server != "user@example.com" {
@@ -4339,6 +4364,7 @@ fn windows_update_script(
     installer_role: &str,
     update_cache: &str,
     use_prebuilt: &str,
+    binary_version: Option<&str>,
 ) -> String {
     let mut script = String::from("$ErrorActionPreference='Stop';");
     script.push_str("$ProgressPreference='SilentlyContinue';");
@@ -4355,6 +4381,12 @@ fn windows_update_script(
     ] {
         script.push_str(&format!("$env:{name}={};", powershell_string(value)));
     }
+    if let Some(version) = binary_version {
+        script.push_str(&format!(
+            "$env:DOSH_BINARY_VERSION={};",
+            powershell_string(version)
+        ));
+    }
     if config.server != "user@example.com" {
         script.push_str(&format!(
             "$env:DOSH_SERVER={};",
@@ -9433,8 +9465,8 @@ mod tests {
         strip_stale_mouse_reports, strip_terminal_focus_reports, strip_unowned_terminal_reports,
         summarize_trace_file, summarize_trace_file_with_mode, terminal_private_mode_transition,
         toml_bare_key_or_quoted, top_trace_events, trace_report_warnings, unix_update_script,
-        update_installer_url, update_version_status, upsert_managed_block, valid_forward_host,
-        vscode_safe_alias, windows_update_script,
+        update_binary_version_for_installer, update_installer_url, update_version_status,
+        upsert_managed_block, valid_forward_host, vscode_safe_alias, windows_update_script,
     };
     use dosh::config::{ClientConfig, CommandExtension, HostConfig};
     use dosh::native::EnvVar;
@@ -11098,6 +11130,7 @@ mod tests {
             "both",
             "/tmp/dosh-cache",
             "1",
+            None,
         );
         assert!(unix.contains("curl -fsSL"));
         assert!(unix.contains("install.sh"));
@@ -11112,6 +11145,7 @@ mod tests {
             "client",
             "C:\\Users\\palav\\AppData\\Local\\dosh\\source",
             "1",
+            None,
         );
         assert!(
             windows.contains(
@@ -11125,6 +11159,46 @@ mod tests {
         assert!(!windows.contains(" sh -s "));
     }
 
+    #[test]
+    fn update_uses_local_tag_when_release_latest_is_older() {
+        assert_eq!(
+            update_binary_version_for_installer("1.0.0-rc41", Some("v1.0.0-rc37")).as_deref(),
+            Some("v1.0.0-rc41")
+        );
+        assert_eq!(
+            update_binary_version_for_installer("1.0.0-rc41", Some("v1.0.0-rc41")),
+            None
+        );
+        assert_eq!(
+            update_binary_version_for_installer("1.0.0-rc41", Some("v1.0.0-rc42")),
+            None
+        );
+        let config = ClientConfig::default();
+        let unix = unix_update_script(
+            &config,
+            "https://git.palav.dev/Palav/dosh.git",
+            "https://git.palav.dev/Palav/dosh/raw/branch/main/install.sh",
+            "both",
+            "/tmp/dosh-cache",
+            "1",
+            Some("v1.0.0-rc41"),
+        );
+        assert!(unix.contains("DOSH_BINARY_VERSION='v1.0.0-rc41'"));
+        assert!(unix.contains("| DOSH_REPO="));
+        assert!(unix.contains(" sh -s -- 'both'"));
+
+        let windows = windows_update_script(
+            &config,
+            "https://git.palav.dev/Palav/dosh.git",
+            "https://git.palav.dev/Palav/dosh/raw/branch/main/install.ps1",
+            "client",
+            "C:\\Users\\palav\\AppData\\Local\\dosh\\source",
+            "1",
+            Some("v1.0.0-rc41"),
+        );
+        assert!(windows.contains("$env:DOSH_BINARY_VERSION='v1.0.0-rc41';"));
+    }
+
     #[test]
     fn status_uses_host_alias_and_user() {
         let host = HostConfig {