1 files changed, 46 insertions, 0 deletions
diff --git a/nix-rust/src/util/tarfile.rs b/nix-rust/src/util/tarfile.rs
new file mode 100644
index 000000000..379d9098f
--- /dev/null
+++ b/nix-rust/src/util/tarfile.rs
@@ -0,0 +1,46 @@
+use crate::{foreign::Source, Error};
+use std::fs;
+use std::io;
+use std::os::unix::fs::OpenOptionsExt;
+use std::path::Path;
+use tar::Archive;
+
+pub fn unpack_tarfile(source: Source, dest_dir: &str) -> Result<(), Error> {
+    let dest_dir = Path::new(dest_dir);
+
+    let mut tar = Archive::new(source);
+
+    for file in tar.entries()? {
+        let mut file = file?;
+
+        let dest_file = dest_dir.join(file.path()?);
+
+        fs::create_dir_all(dest_file.parent().unwrap())?;
+
+        match file.header().entry_type() {
+            tar::EntryType::Directory => {
+                fs::create_dir(dest_file)?;
+            }
+            tar::EntryType::Regular => {
+                let mode = if file.header().mode()? & (libc::S_IXUSR as u32) == 0 {
+                    0o666
+                } else {
+                    0o777
+                };
+                let mut f = fs::OpenOptions::new()
+                    .create(true)
+                    .write(true)
+                    .mode(mode)
+                    .open(dest_file)?;
+                io::copy(&mut file, &mut f)?;
+            }
+            tar::EntryType::Symlink => {
+                std::os::unix::fs::symlink(file.header().link_name()?.unwrap(), dest_file)?;
+            }
+            tar::EntryType::XGlobalHeader | tar::EntryType::XHeader => {}
+            t => return Err(Error::Misc(format!("unsupported tar entry type '{:?}'", t))),
+        }
+    }
+
+    Ok(())
+}