ffi: add method for getting the build time git short sha value (#1909)

Author: stefanceriu

Cargo.lock

@@ -18,6 +18,7 @@ bundled-sqlite = ["matrix-sdk/bundled-sqlite"]
 
 [build-dependencies]
 uniffi = { workspace = true, features = ["build"] }
+vergen = { version = "8.1.3", features = ["build", "git", "gitcl"] }
 
 [dependencies]
 anyhow = { workspace = true }

bindings/matrix-sdk-ffi/Cargo.toml

@@ -1,4 +1,6 @@
-use std::env;
+use std::{env, error::Error};
+
+use vergen::EmitBuilder;
 
 /// Adds a temporary workaround for an issue with the Rust compiler and Android
 /// in x86_64 devices: https://github.com/rust-lang/rust/issues/109717.
@@ -27,7 +29,9 @@ fn setup_x86_64_android_workaround() {
     }
 }
 
-fn main() {
+fn main() -> Result<(), Box<dyn Error>> {
     setup_x86_64_android_workaround();
     uniffi::generate_scaffolding("./src/api.udl").expect("Building the UDL file failed");
+    EmitBuilder::builder().git_sha(true).emit()?;
+    Ok(())
 }

bindings/matrix-sdk-ffi/build.rs

@@ -57,3 +57,8 @@ pub use self::{
 };
 
 uniffi::include_scaffolding!("api");
+
+#[uniffi::export]
+pub fn sdk_git_sha() -> String {
+    env!("VERGEN_GIT_SHA").to_string()
+}