Add binary info to root endpoint

Author: Geometrically

Cargo.lock

@@ -131,6 +131,7 @@ json-patch = "*"
 ariadne = { path = "../../packages/ariadne" }
 
 clap = { version = "4.5", features = ["derive"] }
+iana-time-zone = "0.1.61"
 
 [target.'cfg(not(target_env = "msvc"))'.dependencies]
 tikv-jemallocator = { version = "0.6.0", features = ["profiling", "unprefixed_malloc_on_supported_platforms"] }
@@ -139,3 +140,8 @@ jemalloc_pprof = { version = "0.7.0", features = ["flamegraph"] }
 
 [dev-dependencies]
 actix-http = "3.4.0"
+
+[build-dependencies]
+dotenv-build = "0.1.1"
+chrono = "0.4.38"
+iana-time-zone = "0.1.60"

apps/labrinth/Cargo.toml

@@ -1,3 +1,47 @@
+use std::path::Path;
+use std::process::Command;
+
+use chrono::Local;
+use dotenv_build::Config;
+
 fn main() {
+    let output = Command::new("git")
+        .arg("rev-parse")
+        .arg("HEAD")
+        .output()
+        .expect("`git` invocation to succeed");
+
+    let git_hash = String::from_utf8(output.stdout)
+        .expect("valid UTF-8 output from `git` invocation");
+
+    println!("cargo::rerun-if-changed=.git/HEAD");
+    println!("cargo::rustc-env=GIT_HASH={}", git_hash.trim());
+
+    let timedate_fmt = Local::now().format("%F @ %I:%M %p");
+    let timezone_fmt = iana_time_zone::get_timezone()
+        .map(|tz| format!(" ({tz})"))
+        .unwrap_or_default();
+
+    let comptime = timedate_fmt.to_string() + timezone_fmt.as_str();
+
+    println!("cargo::rustc-env=COMPILATION_DATE={comptime}");
+
+    // trick to get compilation profile
+    let profile = std::env::var("OUT_DIR")
+        .expect("OUT_DIR to be set")
+        .split(std::path::MAIN_SEPARATOR)
+        .nth_back(3)
+        .unwrap_or("unknown")
+        .to_string();
+
+    println!("cargo::rustc-env=COMPILATION_PROFILE={profile}");
+
+    dotenv_build::output(Config {
+        filename: Path::new(".build.env"),
+        recursive_search: true,
+        fail_if_missing_dotenv: false,
+    })
+    .unwrap();
+
     println!("cargo:rerun-if-changed=migrations");
 }

apps/labrinth/build.rs

@@ -7,7 +7,13 @@ pub async fn index_get() -> HttpResponse {
         "name": "modrinth-labrinth",
         "version": env!("CARGO_PKG_VERSION"),
         "documentation": "https://docs.modrinth.com",
-        "about": "Welcome traveler!"
+        "about": "Welcome traveler!",
+
+        "build_info": {
+            "comp_date": env!("COMPILATION_DATE"),
+            "git_hash":  env!("GIT_HASH", "unknown"),
+            "profile": env!("COMPILATION_PROFILE"),
+        }
     });
 
     HttpResponse::Ok().json(data)