1 files changed, 53 insertions, 0 deletions
diff --git a/xtask/src/build.rs b/xtask/src/build.rs
new file mode 100644
index 00000000..a8c19aac
--- /dev/null
+++ b/xtask/src/build.rs
@@ -0,0 +1,53 @@
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use crate::{command::BuildMode, TestRunError};
+
+const HEX_BUILD_ROOT: &str = "ci/builds";
+
+/// make sure we're starting with a clean,but existing slate
+pub fn init_build_dir() -> anyhow::Result<()> {
+    if Path::new(HEX_BUILD_ROOT).exists() {
+        fs::remove_dir_all(HEX_BUILD_ROOT)
+            .map_err(|_| anyhow::anyhow!("Could not clear out directory:  {}", HEX_BUILD_ROOT))?;
+    }
+    fs::create_dir_all(HEX_BUILD_ROOT)
+        .map_err(|_| anyhow::anyhow!("Could not create directory:  {}", HEX_BUILD_ROOT))
+}
+
+pub fn build_hexpath(
+    example: &str,
+    features: Option<&str>,
+    build_mode: BuildMode,
+    build_num: u32,
+) -> anyhow::Result<String> {
+    let features = match features {
+        Some(f) => f,
+        None => "",
+    };
+
+    let filename = format!("{}_{}_{}_{}.hex", example, features, build_mode, build_num);
+
+    let mut path = PathBuf::from(HEX_BUILD_ROOT);
+    path.push(filename);
+
+    path.into_os_string()
+        .into_string()
+        .map_err(|e| anyhow::Error::new(TestRunError::PathConversionError(e)))
+}
+
+pub fn compare_builds(file_1: String, file_2: String) -> anyhow::Result<()> {
+    let buf_1 = std::fs::read_to_string(file_1.clone())?;
+    let buf_2 = std::fs::read_to_string(file_2.clone())?;
+
+    if buf_1 != buf_2 {
+        return Err(anyhow::Error::new(TestRunError::FileCmpError {
+            file_1,
+            file_2,
+        }));
+    }
+
+    Ok(())
+}