Reject empty HOME envvar

src/lib.rs

@@ -6,6 +6,7 @@ mod sandbox;
 
 pub use errors::SandboxError;
 
+use std::env;
 use std::ffi::OsString;
 use std::os::unix::process::CommandExt;
 use std::path::PathBuf;
@@ -27,6 +28,13 @@ pub struct SandboxConfig {
     pub dry_run: bool,
 }
 
+pub fn require_home() -> Result<String, SandboxError> {
+    env::var("HOME")
+        .ok()
+        .filter(|h| !h.is_empty())
+        .ok_or(SandboxError::HomeNotSet)
+}
+
 pub fn run(config: SandboxConfig) -> Result<(), SandboxError> {
     preflight::check(&config)?;