ssh remoting: Check nightly version correctly by comparing commit SHA (#19884)

This ensures that we detect if a new nightly version of the remote
server is available.
Previously we would always mark a version as matching if they had the
same semantic version.
However, for nightly versions we also need to check if they have the
same commit SHA.

Co-Authored-by: Thorsten <thorsten@zed.dev>

Release Notes:

- N/A

---------

Co-authored-by: Thorsten <thorsten@zed.dev>

crates/remote_server/build.rs

@@ -1,3 +1,5 @@
+use std::process::Command;
+
 const ZED_MANIFEST: &str = include_str!("../zed/Cargo.toml");
 
 fn main() {
@@ -7,4 +9,23 @@ fn main() {
         "cargo:rustc-env=ZED_PKG_VERSION={}",
         zed_cargo_toml.package.unwrap().version.unwrap()
     );
+
+    // If we're building this for nightly, we want to set the ZED_COMMIT_SHA
+    if let Some(release_channel) = std::env::var("ZED_RELEASE_CHANNEL").ok() {
+        if release_channel.as_str() == "nightly" {
+            // Populate git sha environment variable if git is available
+            println!("cargo:rerun-if-changed=../../.git/logs/HEAD");
+            if let Some(output) = Command::new("git")
+                .args(["rev-parse", "HEAD"])
+                .output()
+                .ok()
+                .filter(|output| output.status.success())
+            {
+                let git_sha = String::from_utf8_lossy(&output.stdout);
+                let git_sha = git_sha.trim();
+
+                println!("cargo:rustc-env=ZED_COMMIT_SHA={git_sha}");
+            }
+        }
+    }
 }

crates/remote_server/src/main.rs

@@ -72,7 +72,12 @@ fn main() {
             }
         },
         Some(Commands::Version) => {
-            println!("{}", env!("ZED_PKG_VERSION"));
+            if let Some(build_sha) = option_env!("ZED_COMMIT_SHA") {
+                println!("{}", build_sha);
+            } else {
+                println!("{}", env!("ZED_PKG_VERSION"));
+            }
+
             std::process::exit(0);
         }
         None => {