Basic support for downloading and using pre-built versoview

verso/build.rs

@@ -0,0 +1,73 @@
+use std::{
+    env,
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+const VERSO_VERSION: &str = "0.0.1";
+
+fn main() {
+    if env::var_os("PRE_BUILT_VERSOVIEW").is_some() {
+        download_and_extract_verso().unwrap();
+    }
+}
+
+fn decompress_archive(archive: &Path) -> Result<(), std::io::Error> {
+    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    // Not ideal, but there's no good way of getting the target directory
+    let target_dir = out_dir
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap();
+    if Command::new("tar")
+        .current_dir(target_dir)
+        .arg("-xf")
+        .arg(archive)
+        .status()?
+        .success()
+    {
+        Ok(())
+    } else {
+        Err(std::io::Error::from(std::io::ErrorKind::NotFound))
+    }
+}
+
+fn download_archive(base_url: &str) -> Result<PathBuf, std::io::Error> {
+    let target = env::var("TARGET").unwrap();
+    let archive_path = PathBuf::from(env::var_os("OUT_DIR").unwrap()).join("verso.tar.gz");
+    if !archive_path.exists() {
+        if !Command::new("curl")
+            .arg("-L")
+            .arg("-f")
+            .arg("-s")
+            .arg("-o")
+            .arg(&archive_path)
+            .arg(format!(
+                "{base_url}/download/versoview-v{VERSO_VERSION}/verso-{target}.tar.gz"
+            ))
+            .status()?
+            .success()
+        {
+            return Err(std::io::Error::from(std::io::ErrorKind::NotFound));
+        }
+    }
+
+    Ok(archive_path)
+}
+
+fn download_and_extract_verso() -> Result<(), std::io::Error> {
+    if let Ok(archive) = env::var("VERSO_ARCHIVE") {
+        // If the archive variable is present, assume it's a URL base to download from.
+        let archive = download_archive(&archive).unwrap_or(PathBuf::from(archive));
+        // Panic directly since the archive is specified manually.
+        decompress_archive(&archive).unwrap();
+    } else {
+        let archive = download_archive("https://github.com/Legend-Master/verso/releases")?;
+        decompress_archive(&archive)?;
+    };
+
+    Ok(())
+}