Emit commit details on contract instantiation

.cargo/config.toml

@@ -5,3 +5,6 @@ wasm = "run --package xtask -- wasm"
 wasm-opt = "run --package xtask -- wasm-opt"
 xtask = "run --package xtask --"
 tally-data-req-fixture = "run --package xtask -- tally-data-req-fixture"
+
+[env]
+GIT_REVISION = "unknown"

contract/src/contract.rs

@@ -21,6 +21,7 @@ use crate::{
 // version info for migration info
 const CONTRACT_NAME: &str = "staking";
 pub const CONTRACT_VERSION: &str = env!("CARGO_PKG_VERSION");
+pub const GIT_REVISION: &str = env!("GIT_REVISION");
 
 #[cfg_attr(not(feature = "library"), entry_point)]
 pub fn instantiate(
@@ -42,7 +43,9 @@ pub fn instantiate(
     CONFIG.save(deps.storage, &init_config)?;
     crate::msgs::data_requests::state::init_data_requests(deps.storage)?;
 
-    Ok(Response::new().add_attribute("method", "instantiate"))
+    Ok(Response::new()
+        .add_attribute("method", "instantiate")
+        .add_attribute("git_revision", GIT_REVISION))
 }
 
 #[cfg_attr(not(feature = "library"), entry_point)]

xtask/src/main.rs

@@ -59,6 +59,7 @@ fn wasm(sh: &Shell) -> Result<()> {
         "cargo build -p seda-contract --release --lib --target wasm32-unknown-unknown --locked"
     )
     .env("RUSTFLAGS", "-C link-arg=-s")
+    .env("GIT_REVISION", get_git_version()?)
     .run()?;
     Ok(())
 }
@@ -161,3 +162,16 @@ fn tally_data_req_fixture(_sh: &Shell) -> Result<()> {
 
     Ok(())
 }
+
+fn get_git_version() -> Result<String> {
+    let git_version = Command::new("git")
+        .args(["describe", "--always", "--dirty=-modified", "--tags"])
+        .output()
+        .context("Invoking git describe")?;
+    if !git_version.status.success() {
+        return Ok("unknown".to_string());
+    }
+
+    let version = String::from_utf8(git_version.stdout)?;
+    Ok(version)
+}